Heat wave in Australia, 21 to 30 September 2023

Name: Heat wave in Australia, 21 to 30 September 2023
Start: 2023-09-21
End: 2023-09-30
Location: Australia

Heat wave in Australia, 21 to 30 September 2023: 192 records at 50 stations, peak on 27 September 2023. Closed.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Key Facts

Heat wave in Australia, 21 to 30 September 2023 set or tied 192 station records at 50 stations.
It ran from 21 September 2023 to 30 September 2023 (10 days) and its peak day was 27 September 2023.
Status: closed.
Northam set a monthly record high maximum temperature of 34.7 C (94.5 F) on 28 September 2023.
The busiest day was 28 September 2023 with 47 records.
The oldest broken record in the ranked list had stood for 104 years.

Footprint

21 to 30 September 2023

The area covered by Heat wave in Australia, 21 to 30 September 2023 is outlined, with 13 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Heat wave in Australia, 21 to 30 September 2023: stations that set records in the event
Station	Type	Value	Date
Northam	Record high maximum temperature	34.7 C (94.5 F)	2023-09-28
Albany	Record high minimum temperature	14.4 C (57.9 F)	2023-09-23
Windy Harbour	Record high maximum temperature	28.6 C (83.5 F)	2023-09-27
Salmon Gums Res.STN.	Record high maximum temperature	37.5 C (99.5 F)	2023-09-29
Mullewa	Record high minimum temperature	17.8 C (64.0 F)	2023-09-27
Narrogin	Record high maximum temperature	30.5 C (86.9 F)	2023-09-27
Onslow Airport	Record high minimum temperature	23.7 C (74.7 F)	2023-09-29
Pingelly	Record high maximum temperature	31.3 C (88.3 F)	2023-09-27
Ravensthorpe	Record high minimum temperature	20.5 C (68.9 F)	2023-09-28
Kalgoorlie-Boulder Airport	Record high minimum temperature	22.2 C (72.0 F)	2023-09-29
Corrigin	Record high maximum temperature	32.0 C (89.6 F)	2023-09-27
Ongerup	Record high minimum temperature	19.1 C (66.4 F)	2023-09-27
Bencubbin	Record high maximum temperature	36.0 C (96.8 F)	2023-09-28

Records per Day

Peak day 43

Records set or tied each day from 21 September 2023 to 30 September 2023. The most in one day was 47 on 28 September 2023.

Records per day during Heat wave in Australia, 21 to 30 September 2023
Date	Records
2023-09-21	6
2023-09-22	29
2023-09-23	28
2023-09-24	6
2023-09-25	7
2023-09-26	4
2023-09-27	43
2023-09-28	47
2023-09-29	20
2023-09-30	2

Top Records by Margin

Margin over the record replaced

Top records of Heat wave in Australia, 21 to 30 September 2023 ranked by margin
Windy Harbour, 09-27	6.4 C (11.5 F)
Kalgoorlie-Boulder Airport, 09-29	6.4 C (11.5 F)
Pingelly, 09-27	6.3 C (11.3 F)
Ongerup, 09-27	4.2 C (7.6 F)
Narrogin, 09-22	3.6 C (6.5 F)
Mullewa, 09-28	3.5 C (6.3 F)
Narrogin, 09-27	3.3 C (5.9 F)
Ravensthorpe, 09-28	2.8 C (5.0 F)
Corrigin, 09-27	2.6 C (4.7 F)
Onslow Airport, 09-29	2.5 C (4.5 F)
Narrogin, 09-23	2.2 C (4.0 F)
Northam, 09-22	2.2 C (4.0 F)
Mullewa, 09-28	2.1 C (3.8 F)
Salmon Gums Res.STN., 09-29	1.9 C (3.4 F)
Mullewa, 09-27	1.7 C (3.1 F)

Margin is how far the new value is beyond the record it replaced. Ties are not shown.

Margin Against Age of the Broken Record

192 records plotted by how far they beat the old record (across) and how many years the old record had stood (up). Long standing records beaten by a wide margin sit in the top right.

Margin against age of the broken record in Heat wave in Australia, 21 to 30 September 2023
Margin (C)	Years the old record stood
0.1	104
0.7	98
6.4	37
1.9	62
3.5	65
1.7	86
3.3	68
1.4	84
2.5	64
3.6	61
0.9	55
2.2	66
6.3	42
2.8	36
6.4	32
1.2	55
2.2	61
2.6	68
4.2	17
2.1	65
8.1	13
0.7	68
2.5	29
0.6	55
3.4	18
1.1	43
0.1	55
1.5	60
6.9	20
1.2	46
0.7	42
0.8	43
3.6	12
0.9	69
1.7	64
1.1	42
2.9	52
2.9	12
3.2	12
0.6	61
6.1	20
1.5	32
5.2	20
5.9	13
1.0	52
0.2	68
0.2	42
4.6	36
2.4	17
2.4	36
3.1	24
0.7	61
3.3	36
2.5	50
6.0	0
2.2	32
2.2	36
4.4	8
2.0	9
1.0	52
0.9	16
1.4	42
1.7	40
1.1	9
2.5	32
1.2	16
4.6	21
5.8	17
0.1	16
1.0	6
2.4	42
1.0	16
3.7	8
2.2	36
1.2	22
1.1	42
4.0	26
0.4	9
1.0	12
0.7	40
6.4	9
2.7	36
4.8	8
2.0	42
5.2	4
0.9	24
0.3	42
2.7	21
1.8	36
0.3	16
0.3	16
1.1	42
0.8	40
1.1	24
0.8	0
0.8	9
0.2	12
2.5	22
0.9	24
1.1	40
0.8	41
3.5	0
1.4	28
0.3	36
2.3	22
0.4	42
0.5	36
4.0	4
0.5	40
0.5	42
1.9	12
0.5	38
0.2	4
1.1	36
0.7	32
0.5	9
0.7	36
2.8	4
3.3	22
0.1	42
1.5	3
0.4	42
1.0	3
1.4	32
3.1	8
3.1	24
2.3	12
0.5	34
2.4	8
1.2	21
0.1	0
0.5	32
1.7	21
3.0	9
1.0	22
2.2	17
2.0	28
1.1	16
0.7	12
1.6	16
1.0	32
2.0	12
2.5	12
4.4	1
0.5	32
2.7	9
2.2	22
0.6	16
1.8	4
0.1	22
0.5	24
0.9	22
1.8	0
1.2	12
1.9	4
0.1	24
1.2	21
0.1	24
1.3	4
1.0	25
2.4	8
1.6	12
1.4	10
0.1	28
3.5	1
1.4	4
2.4	4
0.2	16
1.6	4
0.9	17
0.1	22
0.1	16
0.8	16
0.7	16
1.7	1
0.4	6
0.2	6
1.0	1
0.1	14
0.4	12
1.1	4
0.4	18
0.2	1
1.0	1
0.1	12
0.2	8
0.8	1
0.1	9
1.0	4
0.8	4
0.2	10
0.5	1

Compared With Other Events

Station records per event

Station records in Heat wave in Australia, 21 to 30 September 2023 compared with similar events
Heat wave in United States and Mexico, 16 January to 14 February 2024	9,869 records
Heat wave in United States, 28 January to 24 February 2026	6,528 records
Heat wave in United States and Mexico, 24 May to 19 June 2020	5,047 records
Heat wave in United States and Mexico, 26 March to 17 April 2021	3,669 records
Heat wave in Germany and 49 other countries, 18 December 2021 to 15 January 2022	3,626 records
Heat wave in Australia, 21 to 30 September 2023 (this event)	192 records

Every Record Set

20 of 192

Every record set or tied during Heat wave in Australia, 21 to 30 September 2023, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2023-09-22	Narrogin	Record high maximum temperature	31.9 C (89.4 F)	3.6 C (6.5 F)	61	38 of 100 (Notable)
2023-09-22	Northam	Record high maximum temperature	34.4 C (93.9 F)	2.2 C (4.0 F)	61	34 of 100 (Routine)
2023-09-23	Albany	Record high minimum temperature	14.4 C (57.9 F)	0.7 C (1.3 F)	98	42 of 100 (Notable)
2023-09-23	Narrogin	Record high minimum temperature	13.9 C (57.0 F)	2.2 C (4.0 F)	66	37 of 100 (Notable)
2023-09-27	Windy Harbour	Record high maximum temperature	28.6 C (83.5 F)	6.4 C (11.5 F)	37	42 of 100 (Notable)
2023-09-27	Mullewa	Record high minimum temperature	17.8 C (64.0 F)	1.7 C (3.1 F)	86	40 of 100 (Notable)
2023-09-27	Narrogin	Record high maximum temperature	30.5 C (86.9 F)	3.3 C (5.9 F)	68	39 of 100 (Notable)
2023-09-27	Mullewa	Record high maximum temperature	38.5 C (101.3 F)	0.9 C (1.6 F)	55	37 of 100 (Notable)
2023-09-27	Pingelly	Record high maximum temperature	31.3 C (88.3 F)	6.3 C (11.3 F)	42	36 of 100 (Notable)
2023-09-27	Corrigin	Record high maximum temperature	32.0 C (89.6 F)	2.6 C (4.7 F)	68	34 of 100 (Routine)
2023-09-27	Ongerup	Record high minimum temperature	19.1 C (66.4 F)	4.2 C (7.6 F)	17	34 of 100 (Routine)
2023-09-28	Northam	Record high maximum temperature	34.7 C (94.5 F)	0.1 C (0.2 F)	104	50 of 100 (Notable)
2023-09-28	Mullewa	Record high minimum temperature	19.6 C (67.3 F)	3.5 C (6.3 F)	65	40 of 100 (Notable)
2023-09-28	Narrogin	Record high minimum temperature	14.0 C (57.2 F)	1.4 C (2.5 F)	84	39 of 100 (Notable)
2023-09-28	Ravensthorpe	Record high minimum temperature	20.5 C (68.9 F)	2.8 C (5.0 F)	36	36 of 100 (Notable)
2023-09-28	Bencubbin	Record high maximum temperature	36.0 C (96.8 F)	1.2 C (2.2 F)	55	34 of 100 (Routine)
2023-09-28	Mullewa	Record high maximum temperature	37.1 C (98.8 F)	2.1 C (3.8 F)	65	33 of 100 (Routine)
2023-09-29	Salmon Gums Res.STN.	Record high maximum temperature	37.5 C (99.5 F)	1.9 C (3.4 F)	62	41 of 100 (Notable)
2023-09-29	Onslow Airport	Record high minimum temperature	23.7 C (74.7 F)	2.5 C (4.5 F)	64	38 of 100 (Notable)
2023-09-29	Kalgoorlie-Boulder Airport	Record high minimum temperature	22.2 C (72.0 F)	6.4 C (11.5 F)	32	35 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 192 records the event counts. The counts above use the full total.

Download the Data

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 2026-10-17. Events are found by this site from station records and are not official designations. Records are provisional until reprocessed.

Margin (C)	Years the old record stood
0.1	104
0.7	98
6.4	37
1.9	62
3.5	65
1.7	86
3.3	68
1.4	84
2.5	64
3.6	61
0.9	55
2.2	66
6.3	42
2.8	36
6.4	32
1.2	55
2.2	61
2.6	68
4.2	17
2.1	65
8.1	13
0.7	68
2.5	29
0.6	55
3.4	18
1.1	43
0.1	55
1.5	60
6.9	20
1.2	46
0.7	42
0.8	43
3.6	12
0.9	69
1.7	64
1.1	42
2.9	52
2.9	12
3.2	12
0.6	61
6.1	20
1.5	32
5.2	20
5.9	13
1.0	52
0.2	68
0.2	42
4.6	36
2.4	17
2.4	36
3.1	24
0.7	61
3.3	36
2.5	50
6.0	0
2.2	32
2.2	36
4.4	8
2.0	9
1.0	52
0.9	16
1.4	42
1.7	40
1.1	9
2.5	32
1.2	16
4.6	21
5.8	17
0.1	16
1.0	6
2.4	42
1.0	16
3.7	8
2.2	36
1.2	22
1.1	42
4.0	26
0.4	9
1.0	12
0.7	40
6.4	9
2.7	36
4.8	8
2.0	42
5.2	4
0.9	24
0.3	42
2.7	21
1.8	36
0.3	16
0.3	16
1.1	42
0.8	40
1.1	24
0.8	0
0.8	9
0.2	12
2.5	22
0.9	24
1.1	40
0.8	41
3.5	0
1.4	28
0.3	36
2.3	22
0.4	42
0.5	36
4.0	4
0.5	40
0.5	42
1.9	12
0.5	38
0.2	4
1.1	36
0.7	32
0.5	9
0.7	36
2.8	4
3.3	22
0.1	42
1.5	3
0.4	42
1.0	3
1.4	32
3.1	8
3.1	24
2.3	12
0.5	34
2.4	8
1.2	21
0.1	0
0.5	32
1.7	21
3.0	9
1.0	22
2.2	17
2.0	28
1.1	16
0.7	12
1.6	16
1.0	32
2.0	12
2.5	12
4.4	1
0.5	32
2.7	9
2.2	22
0.6	16
1.8	4
0.1	22
0.5	24
0.9	22
1.8	0
1.2	12
1.9	4
0.1	24
1.2	21
0.1	24
1.3	4
1.0	25
2.4	8
1.6	12
1.4	10
0.1	28
3.5	1
1.4	4
2.4	4
0.2	16
1.6	4
0.9	17
0.1	22
0.1	16
0.8	16
0.7	16
1.7	1
0.4	6
0.2	6
1.0	1
0.1	14
0.4	12
1.1	4
0.4	18
0.2	1
1.0	1
0.1	12
0.2	8
0.8	1
0.1	9
1.0	4
0.8	4
0.2	10
0.5	1

Margin (C)	Years the old record stood
0.1	104
0.7	98
6.4	37
1.9	62
3.5	65
1.7	86
3.3	68
1.4	84
2.5	64
3.6	61
0.9	55
2.2	66
6.3	42
2.8	36
6.4	32
1.2	55
2.2	61
2.6	68
4.2	17
2.1	65
8.1	13
0.7	68
2.5	29
0.6	55
3.4	18
1.1	43
0.1	55
1.5	60
6.9	20
1.2	46
0.7	42
0.8	43
3.6	12
0.9	69
1.7	64
1.1	42
2.9	52
2.9	12
3.2	12
0.6	61
6.1	20
1.5	32
5.2	20
5.9	13
1.0	52
0.2	68
0.2	42
4.6	36
2.4	17
2.4	36
3.1	24
0.7	61
3.3	36
2.5	50
6.0	0
2.2	32
2.2	36
4.4	8
2.0	9
1.0	52
0.9	16
1.4	42
1.7	40
1.1	9
2.5	32
1.2	16
4.6	21
5.8	17
0.1	16
1.0	6
2.4	42
1.0	16
3.7	8
2.2	36
1.2	22
1.1	42
4.0	26
0.4	9
1.0	12
0.7	40
6.4	9
2.7	36
4.8	8
2.0	42
5.2	4
0.9	24
0.3	42
2.7	21
1.8	36
0.3	16
0.3	16
1.1	42
0.8	40
1.1	24
0.8	0
0.8	9
0.2	12
2.5	22
0.9	24
1.1	40
0.8	41
3.5	0
1.4	28
0.3	36
2.3	22
0.4	42
0.5	36
4.0	4
0.5	40
0.5	42
1.9	12
0.5	38
0.2	4
1.1	36
0.7	32
0.5	9
0.7	36
2.8	4
3.3	22
0.1	42
1.5	3
0.4	42
1.0	3
1.4	32
3.1	8
3.1	24
2.3	12
0.5	34
2.4	8
1.2	21
0.1	0
0.5	32
1.7	21
3.0	9
1.0	22
2.2	17
2.0	28
1.1	16
0.7	12
1.6	16
1.0	32
2.0	12
2.5	12
4.4	1
0.5	32
2.7	9
2.2	22
0.6	16
1.8	4
0.1	22
0.5	24
0.9	22
1.8	0
1.2	12
1.9	4
0.1	24
1.2	21
0.1	24
1.3	4
1.0	25
2.4	8
1.6	12
1.4	10
0.1	28
3.5	1
1.4	4
2.4	4
0.2	16
1.6	4
0.9	17
0.1	22
0.1	16
0.8	16
0.7	16
1.7	1
0.4	6
0.2	6
1.0	1
0.1	14
0.4	12
1.1	4
0.4	18
0.2	1
1.0	1
0.1	12
0.2	8
0.8	1
0.1	9
1.0	4
0.8	4
0.2	10
0.5	1