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Rottnest Island Weather Records (ASN00009193)

Record envelope, standing records and threshold days for Rottnest Island (ASN00009193), Australia, with 44 years of record.

Key Facts for Rottnest Island

  • Rottnest Island (ASN00009193) is a weather station in Australia at -32.01 latitude and 115.50 longitude, 43 m (141 ft) above sea level.
  • The station reports from 1983 to 2026, 44 years of record.
  • 1,464 records set at Rottnest Island still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Rottnest Island set a daily record high maximum temperature of 23.4 C (74.1 F) on 18 September 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Australia, -32.01 latitude, 115.50 longitude.
  • Elevation: 43 m (141 ft).
  • Period of record: 1983 to 2026, 44 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

11 days at or beyond a record
Daily record high and record low at Rottnest Island, with 2026 drawn through them The band shows the record high and record low for each calendar day at Rottnest Island. The lines show the 2026 daily maximum and minimum. 11 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 01020304050 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Rottnest Island. The lines show the 2026 daily maximum and minimum. 11 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Rottnest Island, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan41.9 C (107.4 F)11.3 C (52.3 F)36.2 C (97.2 F)15.9 C (60.6 F)
Feb41.5 C (106.7 F)10.0 C (50.0 F)39.4 C (102.9 F)15.6 C (60.1 F)
Mar40.8 C (105.4 F)5.9 C (42.6 F)36.3 C (97.3 F)15.1 C (59.2 F)
Apr35.2 C (95.4 F)4.0 C (39.2 F)25.9 C (78.6 F)13.2 C (55.8 F)
May29.2 C (84.6 F)6.5 C (43.7 F)25.4 C (77.7 F)12.4 C (54.3 F)
Jun24.9 C (76.8 F)3.9 C (39.0 F)21.2 C (70.2 F)11.3 C (52.3 F)
Jul23.4 C (74.1 F)6.0 C (42.8 F)21.8 C (71.2 F)9.9 C (49.8 F)
Aug28.3 C (82.9 F)6.1 C (43.0 F)23.2 C (73.8 F)7.4 C (45.3 F)
Sep32.8 C (91.0 F)6.7 C (44.1 F)27.8 C (82.0 F)11.5 C (52.7 F)
Oct34.0 C (93.2 F)6.7 C (44.1 F)18.1 C (64.6 F)12.9 C (55.2 F)
Nov37.0 C (98.6 F)6.6 C (43.9 F)n/an/a
Dec42.5 C (108.5 F)10.8 C (51.4 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Rottnest Island by the year they were set 1,464 records at Rottnest Island still stand. 1991 holds the most, with 69. 0204060801983: 51984: 241985: 31986: 61990: 481991: 691992: 451993: 341994: 351995: 361996: 261997: 361998: 471999: 322000: 292001: 432002: 372003: 322004: 472005: 582006: 402007: 482008: 242009: 292010: 432011: 332012: 372013: 362014: 312015: 442016: 382017: 402018: 232019: 482020: 422021: 412022: 342023: 442024: 352025: 432026: 19198319911996200120062011201620212026
1,464 records at Rottnest Island still stand. 1991 holds the most, with 69.
Standing records at Rottnest Island by the year they were set
Year setStanding records
19835
198424
19853
19866
199048
199169
199245
199334
199435
199536
199626
199736
199847
199932
200029
200143
200237
200332
200447
200558
200640
200748
200824
200929
201043
201133
201237
201336
201431
201544
201638
201740
201823
201948
202042
202141
202234
202344
202435
202543
202619

All-Time Record Progression

2 new records
When Rottnest Island set new all-time records 2 all-time records were set at Rottnest Island between 26 December 2021 and 27 December 2021. Each dot is a new record. Record high maximum temperatureRecord high minimum temperature26 December 2021: Record high maximum temperature 42.5 C (108.5 F)27 December 2021: Record high minimum temperature 27.0 C (80.6 F)
2 all-time records were set at Rottnest Island between 26 December 2021 and 27 December 2021. Each dot is a new record.
When Rottnest Island set new all-time records
DateKindDetail
2021-12-26Record high maximum temperatureRecord high maximum temperature 42.5 C (108.5 F)
2021-12-27Record high minimum temperatureRecord high minimum temperature 27.0 C (80.6 F)

Wettest Day of Each Month

Jun: 154.7 mm (6.1 in)
Record daily precipitation for each month at Rottnest Island The wettest day on record for each calendar month at Rottnest Island. The most was 154.7 mm (6.1 in) on 21 June 1984. 050100150200 Jan: 142.2 mm (5.6 in), 16 January 2018 Jan Feb: 93.8 mm (3.7 in), 10 February 2017 Feb Mar: 76.6 mm (3.0 in), 28 March 2026 Mar Apr: 49.8 mm (2.0 in), 1 April 2008 Apr May: 72.9 mm (2.9 in), 18 May 1993 May Jun: 154.7 mm (6.1 in), 21 June 1984 Jun Jul: 66.8 mm (2.6 in), 21 July 2011 Jul Aug: 34.6 mm (1.4 in), 9 August 2017 Aug Sep: 42.0 mm (1.7 in), 14 September 2013 Sep Oct: 58.0 mm (2.3 in), 18 October 1995 Oct Nov: 52.0 mm (2.0 in), 16 November 1999 Nov Dec: 36.2 mm (1.4 in), 13 December 2011 Dec
The wettest day on record for each calendar month at Rottnest Island. The most was 154.7 mm (6.1 in) on 21 June 1984.
Record daily precipitation for each month at Rottnest Island
MonthRecord daily precipitation (mm)Date
Jan142.2 mm (5.6 in)16 January 2018
Feb93.8 mm (3.7 in)10 February 2017
Mar76.6 mm (3.0 in)28 March 2026
Apr49.8 mm (2.0 in)1 April 2008
May72.9 mm (2.9 in)18 May 1993
Jun154.7 mm (6.1 in)21 June 1984
Jul66.8 mm (2.6 in)21 July 2011
Aug34.6 mm (1.4 in)9 August 2017
Sep42.0 mm (1.7 in)14 September 2013
Oct58.0 mm (2.3 in)18 October 1995
Nov52.0 mm (2.0 in)16 November 1999
Dec36.2 mm (1.4 in)13 December 2011

Period of Record Coverage

1983 to 2026
Days with data per year at Rottnest Island 41 years of record at Rottnest Island, 1983 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1983, 1984, 1985, 1986, 1991, 2026. 1983: 53 of 365 days1984: 153 of 366 days1985: 28 of 365 days1986: 52 of 365 days1990: 350 of 365 days1991: 320 of 365 days1992: 344 of 366 days1993: 338 of 365 days1994: 332 of 365 days1995: 359 of 365 days1996: 365 of 366 days1997: 364 of 365 days1998: 363 of 365 days1999: 359 of 365 days2000: 361 of 366 days2001: 362 of 365 days2002: 362 of 365 days2003: 362 of 365 days2004: 366 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 364 of 365 days2008: 366 of 366 days2009: 363 of 365 days2010: 365 of 365 days2011: 364 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 364 of 365 days2016: 365 of 366 days2017: 363 of 365 days2018: 363 of 365 days2019: 362 of 365 days2020: 363 of 366 days2021: 363 of 365 days2022: 364 of 365 days2023: 359 of 365 days2024: 360 of 366 days2025: 364 of 365 days2026: 244 of 365 days1990200020102020
41 years of record at Rottnest Island, 1983 to 2026. 6 years have data for under 90 percent of days and are left out of rankings: 1983, 1984, 1985, 1986, 1991, 2026.
Days with data per year at Rottnest Island
YearDays with dataShare of yearComplete
19835315%No
198415342%No
1985288%No
19865214%No
199035096%Yes
199132088%No
199234494%Yes
199333893%Yes
199433291%Yes
199535998%Yes
1996365100%Yes
1997364100%Yes
199836399%Yes
199935998%Yes
200036199%Yes
200136299%Yes
200236299%Yes
200336299%Yes
2004366100%Yes
2005365100%Yes
2006365100%Yes
2007364100%Yes
2008366100%Yes
200936399%Yes
2010365100%Yes
2011364100%Yes
2012366100%Yes
2013365100%Yes
2014365100%Yes
2015364100%Yes
2016365100%Yes
201736399%Yes
201836399%Yes
201936299%Yes
202036399%Yes
202136399%Yes
2022364100%Yes
202335998%Yes
202436098%Yes
2025364100%Yes
202624467%No

Latest Records

20
Latest records at Rottnest Island
DateStationRecordValueBeat old record byOld record stoodSignificance
18 September 2026Rottnest Island, AUdaily high max (Provisional)23.4 C (74.1 F)1.7 C (3.1 F)28 years19 of 100 (Routine)
17 September 2026Rottnest Island, AUdaily high min (Provisional)18.2 C (64.8 F)1.3 C (2.3 F)13 years14 of 100 (Routine)
16 September 2026Rottnest Island, AUdaily high max (Provisional)27.8 C (82.0 F)4.5 C (8.1 F)7 years24 of 100 (Routine)
16 September 2026Rottnest Island, AUdaily high min (Provisional)17.0 C (62.6 F)1.2 C (2.2 F)20 years16 of 100 (Routine)
27 August 2026Rottnest Island, AUmonthly rain (Provisional)38.4 mm (1.5 in)3.8 mm (0.15 in)9 years22 of 100 (Routine)
14 August 2026Rottnest Island, AUdaily high max20.8 C (69.4 F)0.6 C (1.1 F)28 years15 of 100 (Routine)
8 August 2026Rottnest Island, AUdaily low max14.1 C (57.4 F)0.7 C (1.3 F)36 years17 of 100 (Routine)
8 August 2026Rottnest Island, AUdaily low min8.3 C (46.9 F)0.5 C (0.9 F)36 years16 of 100 (Routine)
31 July 2026Rottnest Island, AUdaily high max21.6 C (70.9 F)0.5 C (0.9 F)1 year6 of 100 (Routine)
17 July 2026Rottnest Island, AUdaily rain38.6 mm (1.5 in)21.6 mm (0.9 in)29 years40 of 100 (Notable)
16 July 2026Rottnest Island, AUdaily high min16.9 C (62.4 F)0.7 C (1.3 F)9 years9 of 100 (Routine)
15 July 2026Rottnest Island, AUdaily high max21.8 C (71.2 F)0.5 C (0.9 F)12 years9 of 100 (Routine)
10 July 2026Rottnest Island, AUdaily high min15.2 C (59.4 F)0.1 C (0.2 F)23 years10 of 100 (Routine)
3 May 2026Rottnest Island, AUdaily low max (Tie)18.6 C (65.5 F)tie28 years3 of 100 (Routine)
2 May 2026Rottnest Island, AUdaily low max16.9 C (62.4 F)1.0 C (1.8 F)12 years11 of 100 (Routine)
1 May 2026Rottnest Island, AUdaily low max16.4 C (61.5 F)0.9 C (1.6 F)7 years9 of 100 (Routine)
1 May 2026Rottnest Island, AUdaily low min12.5 C (54.5 F)0.1 C (0.2 F)7 years6 of 100 (Routine)
27 April 2026Rottnest Island, AUdaily low max17.3 C (63.1 F)0.2 C (0.4 F)20 years10 of 100 (Routine)
21 April 2026Rottnest Island, AUdaily low max18.0 C (64.4 F)1.1 C (2.0 F)7 years9 of 100 (Routine)
15 April 2026Rottnest Island, AUdaily rain13.4 mm (0.5 in)6.4 mm (0.25 in)27 years20 of 100 (Routine)

Climate Trend

34 complete years, 1990 to 2025
Annual mean temperature at Rottnest Island as warming stripes, 1990 to 2025 One stripe for each of 34 complete years at Rottnest Island, 1990 to 2025. Blue stripes are years cooler than the station's own mean of 19.1 C (66.3 F); red stripes are warmer. The coolest year was 1993, at 18.1 C (64.5 F), and the warmest was 2024, at 19.9 C (67.9 F). The strongest colour marks a difference of 1.0 C (1.8 F). 1990: 18.7 C, -0.4 C from the station mean1993: 18.1 C, -1.0 C from the station mean1994: 19.2 C, +0.2 C from the station mean1995: 18.9 C, -0.2 C from the station mean1996: 19.0 C, 0.0 C from the station mean1997: 19.0 C, -0.1 C from the station mean1998: 18.8 C, -0.3 C from the station mean1999: 19.3 C, +0.2 C from the station mean2000: 19.2 C, +0.1 C from the station mean2001: 18.4 C, -0.6 C from the station mean2002: 18.9 C, -0.2 C from the station mean2003: 18.8 C, -0.2 C from the station mean2004: 18.8 C, -0.2 C from the station mean2005: 18.2 C, -0.8 C from the station mean2006: 19.0 C, -0.1 C from the station mean2007: 18.7 C, -0.3 C from the station mean2008: 18.8 C, -0.2 C from the station mean2009: 18.9 C, -0.2 C from the station mean2010: 19.1 C, 0.0 C from the station mean2011: 19.9 C, +0.9 C from the station mean2012: 19.8 C, +0.7 C from the station mean2013: 19.7 C, +0.6 C from the station mean2014: 19.5 C, +0.4 C from the station mean2015: 19.4 C, +0.3 C from the station mean2016: 18.6 C, -0.5 C from the station mean2017: 19.0 C, -0.1 C from the station mean2018: 18.8 C, -0.3 C from the station mean2019: 19.2 C, +0.1 C from the station mean2020: 19.4 C, +0.3 C from the station mean2021: 19.2 C, +0.2 C from the station mean2022: 19.2 C, +0.1 C from the station mean2023: 19.4 C, +0.3 C from the station mean2024: 19.9 C, +0.9 C from the station mean2025: 19.7 C, +0.6 C from the station mean19901995200020052010201520202025
One stripe for each of 34 complete years at Rottnest Island, 1990 to 2025. Blue stripes are years cooler than the station's own mean of 19.1 C (66.3 F); red stripes are warmer. The coolest year was 1993, at 18.1 C (64.5 F), and the warmest was 2024, at 19.9 C (67.9 F). The strongest colour marks a difference of 1.0 C (1.8 F).
Annual mean temperature at Rottnest Island as warming stripes, 1990 to 2025
YearAnnual mean temperatureDifference from the station mean
199018.7 C-0.39 C
199318.1 C-0.99 C
199419.2 C+0.17 C
199518.9 C-0.21 C
199619.0 C-0.04 C
199719.0 C-0.07 C
199818.8 C-0.32 C
199919.3 C+0.24 C
200019.2 C+0.13 C
200118.4 C-0.64 C
200218.9 C-0.18 C
200318.8 C-0.25 C
200418.8 C-0.25 C
200518.2 C-0.85 C
200619.0 C-0.09 C
200718.7 C-0.33 C
200818.8 C-0.24 C
200918.9 C-0.19 C
201019.1 C+0.01 C
201119.9 C+0.85 C
201219.8 C+0.69 C
201319.7 C+0.64 C
201419.5 C+0.44 C
201519.4 C+0.28 C
201618.6 C-0.48 C
201719.0 C-0.11 C
201818.8 C-0.29 C
201919.2 C+0.12 C
202019.4 C+0.34 C
202119.2 C+0.17 C
202219.2 C+0.10 C
202319.4 C+0.30 C
202419.9 C+0.85 C
202519.7 C+0.59 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.4) per decade over 1990 to 2025. In Fahrenheit: 0.4 F (0.2 to 0.7) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Rottnest Island
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.2 C (0.1 to 0.4) per decade0.4 F (0.2 to 0.7) per decade1990 to 202534Rise
Mean daily maximum0.3 C (0.1 to 0.4) per decade0.5 F (0.2 to 0.7) per decade1990 to 202534Rise
Mean daily minimum0.2 C (0.1 to 0.3) per decade0.4 F (0.2 to 0.6) per decade1990 to 202534Rise

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1983 to 2026
Yearly extremes at Rottnest Island: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.5 C (108.5 F)202138.6 C (101.5 F)41
Coldest night (TNn)3.9 C (39.0 F)19917.7 C (45.9 F)41
Wettest day (Rx1day)154.7 mm (6.1 in)198438.0 mm (1.5 in)41
Wettest five days (Rx5day)168.5 mm (6.6 in)198468.4 mm (2.7 in)41
Longest dry spell (CDD)88 days202340 days41

Hottest day (TXx)

Hottest day (TXx) at Rottnest Island by year The hottest day of the year at Rottnest Island, 1983 to 2026. The record is 42.5 C (108.5 F) in 2021, marked on the chart; the median year is 38.6 C (101.5 F). 25303540451990200020102020Record: 42.5 C (108.5 F) in 2021
The hottest day of the year at Rottnest Island, 1983 to 2026. The record is 42.5 C (108.5 F) in 2021, marked on the chart; the median year is 38.6 C (101.5 F).
Hottest day (TXx) at Rottnest Island by year
YearHottest day (TXx)
198329.6 C (85.3 F)
198437.8 C (100.0 F)
198527.4 C (81.3 F)
198625.6 C (78.1 F)
199039.5 C (103.1 F)
199141.9 C (107.4 F)
199237.5 C (99.5 F)
199339.3 C (102.7 F)
199438.0 C (100.4 F)
199536.7 C (98.1 F)
199639.8 C (103.6 F)
199741.5 C (106.7 F)
199840.3 C (104.5 F)
199937.6 C (99.7 F)
200037.0 C (98.6 F)
200136.9 C (98.4 F)
200237.4 C (99.3 F)
200339.1 C (102.4 F)
200440.8 C (105.4 F)
200540.3 C (104.5 F)
200636.4 C (97.5 F)
200739.3 C (102.7 F)
200838.0 C (100.4 F)
200937.7 C (99.9 F)
201041.1 C (106.0 F)
201136.3 C (97.3 F)
201239.5 C (103.1 F)
201338.5 C (101.3 F)
201436.3 C (97.3 F)
201539.4 C (102.9 F)
201640.6 C (105.1 F)
201739.3 C (102.7 F)
201837.9 C (100.2 F)
201937.9 C (100.2 F)
202038.6 C (101.5 F)
202142.5 C (108.5 F)
202239.3 C (102.7 F)
202337.0 C (98.6 F)
202440.6 C (105.1 F)
202540.9 C (105.6 F)
202639.4 C (102.9 F)

Coldest night (TNn)

Coldest night (TNn) at Rottnest Island by year The coldest night of the year at Rottnest Island, 1983 to 2026. The record is 3.9 C (39.0 F) in 1991, marked on the chart; the median year is 7.7 C (45.9 F). 2468101990200020102020Record: 3.9 C (39.0 F) in 1991
The coldest night of the year at Rottnest Island, 1983 to 2026. The record is 3.9 C (39.0 F) in 1991, marked on the chart; the median year is 7.7 C (45.9 F).
Coldest night (TNn) at Rottnest Island by year
YearColdest night (TNn)
19838.8 C (47.8 F)
19849.0 C (48.2 F)
19858.7 C (47.7 F)
19867.0 C (44.6 F)
19907.7 C (45.9 F)
19913.9 C (39.0 F)
19926.2 C (43.2 F)
19937.0 C (44.6 F)
19949.0 C (48.2 F)
19957.0 C (44.6 F)
19968.0 C (46.4 F)
19976.4 C (43.5 F)
19987.6 C (45.7 F)
19996.7 C (44.1 F)
20008.8 C (47.8 F)
20018.5 C (47.3 F)
20026.6 C (43.9 F)
20037.0 C (44.6 F)
20047.5 C (45.5 F)
20056.5 C (43.7 F)
20068.9 C (48.0 F)
20078.3 C (46.9 F)
20087.4 C (45.3 F)
20097.0 C (44.6 F)
20107.9 C (46.2 F)
20119.2 C (48.6 F)
20128.9 C (48.0 F)
20139.2 C (48.6 F)
20148.7 C (47.7 F)
20157.3 C (45.1 F)
20168.0 C (46.4 F)
20178.2 C (46.8 F)
20186.8 C (44.2 F)
20198.5 C (47.3 F)
20207.7 C (45.9 F)
20217.2 C (45.0 F)
20227.9 C (46.2 F)
20237.5 C (45.5 F)
202410.0 C (50.0 F)
20256.0 C (42.8 F)
20267.4 C (45.3 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Rottnest Island by year The wettest day of the year at Rottnest Island, 1983 to 2026. The record is 154.7 mm (6.1 in) in 1984, marked on the chart; the median year is 38.0 mm (1.5 in). 0501001502001990200020102020Record: 154.7 mm (6.1 in) in 1984
The wettest day of the year at Rottnest Island, 1983 to 2026. The record is 154.7 mm (6.1 in) in 1984, marked on the chart; the median year is 38.0 mm (1.5 in).
Wettest day (Rx1day) at Rottnest Island by year
YearWettest day (Rx1day)
198319.8 mm (0.8 in)
1984154.7 mm (6.1 in)
198533.1 mm (1.3 in)
198620.6 mm (0.8 in)
199028.4 mm (1.1 in)
199135.1 mm (1.4 in)
199240.9 mm (1.6 in)
199372.9 mm (2.9 in)
199425.0 mm (1.0 in)
199558.0 mm (2.3 in)
199624.0 mm (0.9 in)
199733.0 mm (1.3 in)
199836.0 mm (1.4 in)
199966.0 mm (2.6 in)
200051.0 mm (2.0 in)
200139.0 mm (1.5 in)
200237.0 mm (1.5 in)
200338.0 mm (1.5 in)
200434.2 mm (1.3 in)
200551.2 mm (2.0 in)
200634.8 mm (1.4 in)
200745.0 mm (1.8 in)
200849.8 mm (2.0 in)
200933.2 mm (1.3 in)
201033.2 mm (1.3 in)
201166.8 mm (2.6 in)
201222.8 mm (0.9 in)
201361.6 mm (2.4 in)
201443.2 mm (1.7 in)
201538.4 mm (1.5 in)
201638.0 mm (1.5 in)
201793.8 mm (3.7 in)
2018142.2 mm (5.6 in)
201946.6 mm (1.8 in)
202034.4 mm (1.4 in)
202161.2 mm (2.4 in)
202227.2 mm (1.1 in)
202329.4 mm (1.2 in)
202430.6 mm (1.2 in)
202541.2 mm (1.6 in)
202676.6 mm (3.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Rottnest Island by year The wettest five days of the year at Rottnest Island, 1983 to 2026. The record is 168.5 mm (6.6 in) in 1984, marked on the chart; the median year is 68.4 mm (2.7 in). 0501001502001990200020102020Record: 168.5 mm (6.6 in) in 1984
The wettest five days of the year at Rottnest Island, 1983 to 2026. The record is 168.5 mm (6.6 in) in 1984, marked on the chart; the median year is 68.4 mm (2.7 in).
Wettest five days (Rx5day) at Rottnest Island by year
YearWettest five days (Rx5day)
198320.6 mm (0.8 in)
1984168.5 mm (6.6 in)
198533.1 mm (1.3 in)
198648.2 mm (1.9 in)
199053.0 mm (2.1 in)
1991111.6 mm (4.4 in)
199260.3 mm (2.4 in)
199390.9 mm (3.6 in)
199455.2 mm (2.2 in)
199578.8 mm (3.1 in)
199661.0 mm (2.4 in)
199750.4 mm (2.0 in)
199852.6 mm (2.1 in)
199974.4 mm (2.9 in)
200065.0 mm (2.6 in)
200174.0 mm (2.9 in)
200282.0 mm (3.2 in)
200378.6 mm (3.1 in)
200448.4 mm (1.9 in)
200583.0 mm (3.3 in)
200642.6 mm (1.7 in)
200758.0 mm (2.3 in)
200878.8 mm (3.1 in)
200948.0 mm (1.9 in)
201049.4 mm (1.9 in)
201182.4 mm (3.2 in)
201245.4 mm (1.8 in)
201374.8 mm (2.9 in)
201461.2 mm (2.4 in)
201576.4 mm (3.0 in)
201668.4 mm (2.7 in)
2017103.0 mm (4.1 in)
2018143.0 mm (5.6 in)
201971.2 mm (2.8 in)
202043.6 mm (1.7 in)
202173.8 mm (2.9 in)
202288.6 mm (3.5 in)
202361.6 mm (2.4 in)
202456.2 mm (2.2 in)
202592.8 mm (3.7 in)
202687.6 mm (3.4 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Rottnest Island by year The longest dry spell of the year at Rottnest Island, 1983 to 2026. The record is 88 days in 2023, marked on the chart; the median year is 40 days. 02550751001990200020102020Record: 88 days in 2023
The longest dry spell of the year at Rottnest Island, 1983 to 2026. The record is 88 days in 2023, marked on the chart; the median year is 40 days.
Longest dry spell (CDD) at Rottnest Island by year
YearLongest dry spell (CDD)
198313 days
198448 days
198526 days
19867 days
199024 days
199118 days
199222 days
199333 days
199435 days
199522 days
199635 days
199754 days
199868 days
199943 days
200037 days
200182 days
200244 days
200332 days
200462 days
200568 days
200652 days
200737 days
200837 days
200937 days
201032 days
201166 days
201255 days
201344 days
201483 days
201532 days
201624 days
201741 days
201840 days
201947 days
202042 days
202139 days
202247 days
202388 days
202484 days
202556 days
202629 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

31 years, 1990 to 2025

A day with at least 38.4 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 149.3 mm (5.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Rottnest Island: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years38.4 mm (1.5 in)
5 years53.9 mm (2.1 in)
10 years68.3 mm (2.7 in)
25 years93.0 mm (3.7 in)
50 years117.7 mm (4.6 in)Longer than the 31 years of record
100 years149.3 mm (5.9 in)Longer than the 31 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 31 years of values from 1990 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 142.2 mm (5.6 in) in 2018; 93.8 mm (3.7 in) in 2017; 66.8 mm (2.6 in) in 2011.

Download the Data

  • Data for Rottnest Island standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Rottnest Island threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).