Weather Records on 18 September 1921

213 weather records were set or tied worldwide on 18 September 1921. Highest significance: Adelaide West Terrace, AU.

Key Facts for 18 September 1921

On 18 September 1921, 213 weather records were set or tied at long-record stations worldwide.
19 were record highs and 9 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 6 monthly and 207 daily.
Adelaide West Terrace set a daily record precipitation of 30.7 mm (1.2 in) on 18 September 1921.
Across 163 earlier years (1803 to 2026) the same calendar date averaged 423 records.

Record Map

213 stations

213 station records on 18 September 1921 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 September 1921: highest significance records shown on the map
Station	Country	Type	Value	Significance
Adelaide West Terrace	Australia	Record daily precipitation	30.7 mm (1.2 in)	52 of 100 (Notable)
Portland Rfc City	United States	Record daily precipitation	41.9 mm (1.6 in)	52 of 100 (Notable)
Port Elliot Caravan Park	Australia	Record daily precipitation	29.2 mm (1.1 in)	49 of 100 (Notable)
Cape Jervis Lighthouse	Australia	Record daily precipitation	31.0 mm (1.2 in)	46 of 100 (Notable)
North Adelaide	Australia	Record daily precipitation	34.5 mm (1.4 in)	45 of 100 (Notable)
Meningie	Australia	Record daily precipitation	25.4 mm (1.0 in)	44 of 100 (Notable)
Syktyvkar	Russia	Record daily precipitation	32.8 mm (1.3 in)	42 of 100 (Notable)
Cape Willoughby	Australia	Record daily precipitation	29.2 mm (1.1 in)	40 of 100 (Notable)
Bologna	Italy	Record high minimum temperature	22.1 C (71.8 F)	40 of 100 (Notable)
Milan	Italy	Record high minimum temperature	19.7 C (67.5 F)	40 of 100 (Notable)
Mount Pleasant	Australia	Record daily precipitation	51.3 mm (2.0 in)	39 of 100 (Notable)
Second Valley (Poolamacca)	Australia	Record daily precipitation	44.5 mm (1.8 in)	39 of 100 (Notable)
Normanville	Australia	Record daily precipitation	29.2 mm (1.1 in)	38 of 100 (Notable)
Minlaton	Australia	Record daily precipitation	27.4 mm (1.1 in)	37 of 100 (Notable)
Coromandel Valley (Branden)	Australia	Record daily precipitation	34.3 mm (1.4 in)	34 of 100 (Routine)
Mitcham Post Office	Australia	Record daily precipitation	35.6 mm (1.4 in)	33 of 100 (Routine)
Mount Torrens	Australia	Record daily precipitation	63.5 mm (2.5 in)	33 of 100 (Routine)
Quorn	Australia	Record daily precipitation	25.4 mm (1.0 in)	31 of 100 (Routine)
Adelaide (Glen Osmond)	Australia	Record daily precipitation	30.5 mm (1.2 in)	29 of 100 (Routine)
Anticosti West Point	Canada	Record daily precipitation	30.5 mm (1.2 in)	29 of 100 (Routine)
Cape May 2 NW	United States	Record high maximum temperature	31.1 C (88.0 F)	28 of 100 (Routine)
Melrose (Para Gums)	Australia	Record daily precipitation	34.5 mm (1.4 in)	27 of 100 (Routine)
Ardrossan	Australia	Record daily precipitation	25.7 mm (1.0 in)	26 of 100 (Routine)
Ardrossan (Winulta)	Australia	Record daily precipitation	30.7 mm (1.2 in)	26 of 100 (Routine)
Mount Barker	Australia	Record daily precipitation	44.7 mm (1.8 in)	25 of 100 (Routine)
Adelaide (Thorndon Park)	Australia	Record daily precipitation	27.2 mm (1.1 in)	24 of 100 (Routine)
Bridgewater	Australia	Record daily precipitation	48.8 mm (1.9 in)	24 of 100 (Routine)
Wooroonook	Australia	Record daily precipitation	29.7 mm (1.2 in)	24 of 100 (Routine)
Clarendon	Australia	Record daily precipitation	33.5 mm (1.3 in)	23 of 100 (Routine)
Hastings Post Office	Australia	Record daily precipitation	25.7 mm (1.0 in)	23 of 100 (Routine)
Wirrabara Forest	Australia	Record daily precipitation	30.7 mm (1.2 in)	22 of 100 (Routine)
Roseworthy	Australia	Record daily precipitation	27.9 mm (1.1 in)	22 of 100 (Routine)
Gumeracha	Australia	Record daily precipitation	41.1 mm (1.6 in)	22 of 100 (Routine)
Battunga	Australia	Record daily precipitation	46.2 mm (1.8 in)	22 of 100 (Routine)
Clarion 3 SW	United States	Record daily precipitation	43.2 mm (1.7 in)	22 of 100 (Routine)
Hahndorf	Australia	Record daily precipitation	50.8 mm (2.0 in)	21 of 100 (Routine)
Narraport	Australia	Record daily precipitation	27.4 mm (1.1 in)	21 of 100 (Routine)
Corny Point	Australia	Record daily precipitation	23.9 mm (0.9 in)	20 of 100 (Routine)
Kingscote	Australia	Record daily precipitation	19.1 mm (0.8 in)	20 of 100 (Routine)
Cape Northumberland	Australia	Record daily precipitation	15.5 mm (0.6 in)	20 of 100 (Routine)
Cooke Plains	Australia	Record daily precipitation	20.3 mm (0.8 in)	20 of 100 (Routine)
Warooka	Australia	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)
Goolwa Council Depot	Australia	Record daily precipitation	18.5 mm (0.7 in)	20 of 100 (Routine)
Milang	Australia	Record daily precipitation	17.8 mm (0.7 in)	20 of 100 (Routine)
Whyte Yarcowie	Australia	Record daily precipitation	22.6 mm (0.9 in)	20 of 100 (Routine)
Adelaide (Pooraka)	Australia	Record daily precipitation	24.6 mm (1.0 in)	20 of 100 (Routine)
Wychitella South	Australia	Record daily precipitation	22.9 mm (0.9 in)	20 of 100 (Routine)
Geelong Sec	Australia	Record daily precipitation	24.1 mm (0.9 in)	20 of 100 (Routine)
Merino (Glenorchy Estate)	Australia	Record daily precipitation	22.6 mm (0.9 in)	20 of 100 (Routine)
Yorketown	Australia	Record daily precipitation	21.6 mm (0.9 in)	20 of 100 (Routine)
Wellington East	Australia	Record daily precipitation	15.5 mm (0.6 in)	20 of 100 (Routine)
Lake Marmal	Australia	Record daily precipitation	17.8 mm (0.7 in)	20 of 100 (Routine)
Yantabulla (Brindingabba)	Australia	Record daily precipitation	16.8 mm (0.7 in)	20 of 100 (Routine)
Collerina (Corrella)	Australia	Record daily precipitation	12.2 mm (0.5 in)	20 of 100 (Routine)
Canoon	Australia	Record daily precipitation	7.6 mm (0.30 in)	20 of 100 (Routine)
Steam Plains 2	Australia	Record daily precipitation	13.5 mm (0.5 in)	20 of 100 (Routine)
Sheringa (Lake Hamilton)	Australia	Record daily precipitation	26.2 mm (1.0 in)	20 of 100 (Routine)
Eudunda	Australia	Record daily precipitation	17.0 mm (0.7 in)	20 of 100 (Routine)
Gladstone	Australia	Record daily precipitation	23.4 mm (0.9 in)	19 of 100 (Routine)
Edithburgh Post Office	Australia	Record daily precipitation	20.6 mm (0.8 in)	19 of 100 (Routine)

Counts by Type and Timescale

213 records

Records set or tied on 18 September 1921 by type: Highest daily maximum 9, Lowest daily maximum 5, Highest daily minimum 10, Lowest daily minimum 4, Heaviest daily rainfall 185.

Records on 18 September 1921 by type
Record type	Records
Highest daily maximum	9
Lowest daily maximum	5
Highest daily minimum	10
Lowest daily minimum	4
Heaviest daily rainfall	185
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 September 1921 by timescale: all-time 0, monthly 6, daily 207.

How Much Records Were Beaten By

204 broken records

Margins by which the 204 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 25.9. Ties are not counted.

Top 20 by Significance

18 September 1921

Top 20 records on 18 September 1921 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 September 1921	Adelaide West Terrace, AU	daily rain	30.7 mm (1.2 in)	10.4 mm (0.4 in)	74 years	52 of 100 (Notable)
18 September 1921	Portland Rfc City, US	daily rain	41.9 mm (1.6 in)	24.1 mm (0.9 in)	39 years	52 of 100 (Notable)
18 September 1921	Port Elliot Caravan Park, AU	daily rain	29.2 mm (1.1 in)	20.3 mm (0.8 in)	20 years	49 of 100 (Notable)
18 September 1921	Cape Jervis Lighthouse, AU	daily rain	31.0 mm (1.2 in)	25.9 mm (1.0 in)	8 years	46 of 100 (Notable)
18 September 1921	North Adelaide, AU	daily rain	34.5 mm (1.4 in)	22.3 mm (0.9 in)	8 years	45 of 100 (Notable)
18 September 1921	Meningie, AU	daily rain	25.4 mm (1.0 in)	16.5 mm (0.6 in)	18 years	44 of 100 (Notable)
18 September 1921	Syktyvkar, RU	daily rain	32.8 mm (1.3 in)	18.1 mm (0.7 in)	4 years	42 of 100 (Notable)
18 September 1921	Cape Willoughby, AU	daily rain	29.2 mm (1.1 in)	14.0 mm (0.6 in)	8 years	40 of 100 (Notable)
18 September 1921	Bologna, IT	daily high min	22.1 C (71.8 F)	0.2 C (0.4 F)	100 years	40 of 100 (Notable)
18 September 1921	Milan, IT	daily high min	19.7 C (67.5 F)	0.1 C (0.2 F)	137 years	40 of 100 (Notable)
18 September 1921	Mount Pleasant, AU	monthly rain	51.3 mm (2.0 in)	11.2 mm (0.4 in)	35 years	39 of 100 (Notable)
18 September 1921	Second Valley (Poolamacca), AU	daily rain	44.5 mm (1.8 in)	20.4 mm (0.8 in)	18 years	39 of 100 (Notable)
18 September 1921	Normanville, AU	daily rain	29.2 mm (1.1 in)	14.0 mm (0.6 in)	18 years	38 of 100 (Notable)
18 September 1921	Minlaton, AU	daily rain	27.4 mm (1.1 in)	13.4 mm (0.5 in)	20 years	37 of 100 (Notable)
18 September 1921	Coromandel Valley (Branden), AU	daily rain	34.3 mm (1.4 in)	18.0 mm (0.7 in)	8 years	34 of 100 (Routine)
18 September 1921	Mitcham Post Office, AU	daily rain	35.6 mm (1.4 in)	14.3 mm (0.6 in)	25 years	33 of 100 (Routine)
18 September 1921	Mount Torrens, AU	monthly rain	63.5 mm (2.5 in)	7.4 mm (0.29 in)	35 years	33 of 100 (Routine)
18 September 1921	Quorn, AU	daily rain	25.4 mm (1.0 in)	15.2 mm (0.6 in)	25 years	31 of 100 (Routine)
18 September 1921	Adelaide (Glen Osmond), AU	daily rain	30.5 mm (1.2 in)	13.7 mm (0.5 in)	8 years	29 of 100 (Routine)
18 September 1921	Anticosti West Point, CA	daily rain	30.5 mm (1.2 in)	15.3 mm (0.6 in)	24 years	29 of 100 (Routine)

Significance is a score from 0 to 100 combining margin, the age of the old record and the length of the station's record. How it is computed.

The Same Date in Other Years

1803 to 1921

Records set or tied on this calendar date in each year from 1803 to 1921. 1921 had 213 records.

Counts for years before the ledger starts come from the same station rules.

Records on 09-18 in each year
Year	Records
1803	1
1811	1
1814	1
1819	1
1829	1
1832	1
1834	1
1835	1
1837	2
1847	2
1848	1
1849	1
1851	4
1859	1
1861	1
1865	1
1869	1
1871	1
1875	1
1876	2
1877	1
1879	1
1880	1
1881	1
1882	1
1885	1
1886	4
1889	6
1890	1
1891	1
1893	4
1894	2
1895	2
1896	4
1897	3
1898	5
1899	3
1900	2
1901	10
1902	8
1903	58
1904	6
1905	22
1906	16
1907	4
1908	11
1909	17
1910	5
1911	8
1912	43
1913	44
1914	56
1915	41
1916	58
1917	99
1918	57
1919	48
1920	56
1921	213
1922	45
1923	114
1924	62
1925	269
1926	205
1927	189
1928	114
1929	309
1930	124
1931	429
1932	226
1933	370
1934	188
1935	281
1936	155
1937	422
1938	373
1939	190
1940	402
1941	318
1942	1,001
1943	624
1944	503
1945	732
1946	576
1947	927
1948	427
1949	356
1950	370
1951	320
1952	340
1953	245
1954	446
1955	672
1956	587
1957	429
1958	491
1959	829
1960	351
1961	478
1962	360
1963	453
1964	282
1965	1,172
1966	498
1967	357
1968	763
1969	424
1970	377
1971	1,245
1972	691
1973	593
1974	559
1975	976
1976	615
1977	619
1978	1,162
1979	709
1980	652
1981	1,671
1982	603
1983	936
1984	951
1985	636
1986	730
1987	1,244
1988	997
1989	778
1990	904
1991	1,377
1992	821
1993	747
1994	852
1995	935
1996	1,237
1997	935
1998	1,038
1999	583
2000	1,146
2001	993
2002	828
2003	815
2004	1,027
2005	781
2006	1,309
2007	670
2008	697
2009	692
2010	1,040
2011	1,050
2012	922
2013	666
2014	682
2015	934
2016	893
2017	518
2018	1,200
2019	768
2020	682
2021	582
2022	613
2023	639
2024	687
2025	471
2026	864

Download the Data

Data for records on 1921-09-18: CSV or JSON. Field meanings are on the data page.

Sources: 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)) Made with Natural Earth. Public domain map data. Borders are Natural Earth's de facto depiction. Data as of 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Margin	Records
0 to 5	119
5 to 10	51
10 to 15	21
15 to 20	8
20 to 25	4
25 to 30	1