Weather Records on 21 September 2023

783 weather records were set or tied worldwide on 21 September 2023. Highest significance: Aparan, AM.

Key Facts for 21 September 2023

On 21 September 2023, 783 weather records were set or tied at long-record stations worldwide.
513 were record highs and 73 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 13 monthly and 769 daily.
Aparan set a daily record precipitation of 99.3 mm (3.9 in) on 21 September 2023.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 449 records.

Record Map

783 stations

783 station records on 21 September 2023 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 September 2023: highest significance records shown on the map
Station	Country	Type	Value	Significance
Aparan	Armenia	Record daily precipitation	99.3 mm (3.9 in)	69 of 100 (Major)
Ulleungdo	Korea, South	Record daily precipitation	109.2 mm (4.3 in)	58 of 100 (Notable)
Kiruna	Sweden	Record snow depth	33.0 cm (13.0 in)	57 of 100 (Notable)
Arbuckle Mtn	United States	Record daily precipitation	30.5 mm (1.2 in)	56 of 100 (Notable)
Bjornholt	Norway	Record daily precipitation	54.7 mm (2.2 in)	54 of 100 (Notable)
Bournemouth	United Kingdom	Record daily precipitation	44.7 mm (1.8 in)	52 of 100 (Notable)
Ust-Vojampolka	Russia	Record daily precipitation	27.9 mm (1.1 in)	50 of 100 (Notable)
Morioka	Japan	Record daily precipitation	90.9 mm (3.6 in)	46 of 100 (Notable)
Brownsville	United States	Record high maximum temperature	37.2 C (99.0 F)	46 of 100 (Notable)
Osijek	Croatia	Record high minimum temperature	18.7 C (65.7 F)	45 of 100 (Notable)
Purdum	United States	Record daily precipitation	38.1 mm (1.5 in)	42 of 100 (Notable)
Lunner	Norway	Record daily precipitation	36.0 mm (1.4 in)	41 of 100 (Notable)
Melsom	Norway	Record daily precipitation	43.1 mm (1.7 in)	41 of 100 (Notable)
Boras	Sweden	Record high maximum temperature	24.1 C (75.4 F)	41 of 100 (Notable)
Port Alsworth	United States	Record daily precipitation	32.5 mm (1.3 in)	41 of 100 (Notable)
Uppsala_Aut	Sweden	Record high maximum temperature	22.6 C (72.7 F)	40 of 100 (Notable)
Valentine Miller Fld AP	United States	Record daily precipitation	42.7 mm (1.7 in)	40 of 100 (Notable)
Archerfield Airport	Australia	Record high maximum temperature	34.9 C (94.8 F)	39 of 100 (Notable)
Halmstad Flygflottilj	Sweden	Record high minimum temperature	16.4 C (61.5 F)	39 of 100 (Notable)
Stockholm	Sweden	Record high minimum temperature	15.7 C (60.3 F)	39 of 100 (Notable)
Igsi I Hobol	Norway	Record daily precipitation	33.3 mm (1.3 in)	38 of 100 (Notable)
Sarpsborg	Norway	Record daily precipitation	33.5 mm (1.3 in)	38 of 100 (Notable)
Vologda	Russia	Record high minimum temperature	15.1 C (59.2 F)	38 of 100 (Notable)
Lynch	United States	Record daily precipitation	52.8 mm (2.1 in)	38 of 100 (Notable)
Invercargill Airpor	New Zealand	Record daily precipitation	47.0 mm (1.9 in)	37 of 100 (Notable)
Halmstad Flygflottilj	Sweden	Record high maximum temperature	23.5 C (74.3 F)	37 of 100 (Notable)
Udon Thani	Thailand	Record high maximum temperature	36.8 C (98.2 F)	37 of 100 (Notable)
Kristinehamn	Sweden	Record high maximum temperature	22.9 C (73.2 F)	36 of 100 (Notable)
Melstone	United States	Record daily precipitation	40.6 mm (1.6 in)	36 of 100 (Notable)
Sitiawan	Malaysia	Record daily precipitation	88.6 mm (3.5 in)	35 of 100 (Notable)
Mondovi	United States	Record high maximum temperature	32.2 C (90.0 F)	35 of 100 (Notable)
Lord Howe Island Aero	Australia	Record high maximum temperature	23.7 C (74.7 F)	34 of 100 (Routine)
Joskar-Ola	Russia	Record high minimum temperature	14.3 C (57.7 F)	34 of 100 (Routine)
Karlstad-Airport	Sweden	Record high minimum temperature	15.3 C (59.5 F)	34 of 100 (Routine)
Atnsjoen	Norway	Record daily precipitation	35.9 mm (1.4 in)	33 of 100 (Routine)
Uppsala_Aut	Sweden	Record high minimum temperature	15.7 C (60.3 F)	33 of 100 (Routine)
Borlange Flygplats	Sweden	Record high minimum temperature	15.5 C (59.9 F)	33 of 100 (Routine)
Ashdown 4 SSE	United States	Record low maximum temperature	22.8 C (73.0 F)	33 of 100 (Routine)
Colusa 2 SSW	United States	Record low minimum temperature	2.2 C (36.0 F)	33 of 100 (Routine)
Petersburg 1	United States	Record daily precipitation	112.3 mm (4.4 in)	33 of 100 (Routine)
Nukuoro	Federated States of Micronesia	Record daily precipitation	104.1 mm (4.1 in)	32 of 100 (Routine)
Rijeka	Croatia	Record daily precipitation	91.9 mm (3.6 in)	32 of 100 (Routine)
Soto la Marina (Obs)	Mexico	Record high maximum temperature	40.5 C (104.9 F)	32 of 100 (Routine)
Barkakra	Sweden	Record high maximum temperature	24.5 C (76.1 F)	32 of 100 (Routine)
Orskar_A	Sweden	Record high minimum temperature	15.9 C (60.6 F)	32 of 100 (Routine)
Adel	United States	Record daily precipitation	25.4 mm (1.0 in)	32 of 100 (Routine)
Basel-Mulhouse	France	Record high minimum temperature	16.3 C (61.3 F)	31 of 100 (Routine)
Hiddensee-Vitte	Germany	Record high minimum temperature	16.2 C (61.2 F)	31 of 100 (Routine)
Manderscheid-Sonnenhof	Germany	Record daily precipitation	34.5 mm (1.4 in)	31 of 100 (Routine)
Tryvasshogda	Norway	Record high minimum temperature	11.5 C (52.7 F)	31 of 100 (Routine)
Hallands_Vadero	Sweden	Record high maximum temperature	22.4 C (72.3 F)	31 of 100 (Routine)
Vinga	Sweden	Record high maximum temperature	19.8 C (67.6 F)	31 of 100 (Routine)
Vinga	Sweden	Record high minimum temperature	17.7 C (63.9 F)	31 of 100 (Routine)
Lanai AP 656	United States	Record low maximum temperature	25.6 C (78.1 F)	31 of 100 (Routine)
Moonshine	United States	Record daily precipitation	25.4 mm (1.0 in)	31 of 100 (Routine)
Sibiti	Congo (Brazzaville)	Record high maximum temperature	32.5 C (90.5 F)	30 of 100 (Routine)
List/Sylt	Germany	Record daily precipitation	29.3 mm (1.2 in)	30 of 100 (Routine)
Oparino	Russia	Record high minimum temperature	13.6 C (56.5 F)	30 of 100 (Routine)
Vanersborg	Sweden	Record high minimum temperature	15.3 C (59.5 F)	30 of 100 (Routine)
Tullinge A	Sweden	Record high minimum temperature	15.0 C (59.0 F)	30 of 100 (Routine)

Counts by Type and Timescale

783 records

Records set or tied on 21 September 2023 by type: Highest daily maximum 236, Lowest daily maximum 65, Highest daily minimum 277, Lowest daily minimum 8, Heaviest daily rainfall 194, Deepest snow cover 3.

Records on 21 September 2023 by type
Record type	Records
Highest daily maximum	236
Lowest daily maximum	65
Highest daily minimum	277
Lowest daily minimum	8
Heaviest daily rainfall	194
Heaviest daily snowfall	0
Deepest snow cover	3

Records on 21 September 2023 by timescale: all-time 1, monthly 13, daily 769.

How Much Records Were Beaten By

676 broken records

Margins by which the 676 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 130.0. Ties are not counted.

Top 20 by Significance

21 September 2023

Top 20 records on 21 September 2023 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 2023	Aparan, AM	daily rain	99.3 mm (3.9 in)	83.5 mm (3.3 in)	72 years	69 of 100 (Major)
21 September 2023	Ulleungdo, KR	daily rain	109.2 mm (4.3 in)	69.2 mm (2.7 in)	80 years	58 of 100 (Notable)
21 September 2023	Kiruna, SE	daily snow depth	33.0 cm (13.0 in)	13.0 cm (5.1 in)	90 years	57 of 100 (Notable)
21 September 2023	Arbuckle Mtn, US	daily rain	30.5 mm (1.2 in)	25.4 mm (1.0 in)	40 years	56 of 100 (Notable)
21 September 2023	Bjornholt, NO	daily rain	54.7 mm (2.2 in)	21.7 mm (0.9 in)	84 years	54 of 100 (Notable)
21 September 2023	Bournemouth, GB	daily rain	44.7 mm (1.8 in)	25.6 mm (1.0 in)	40 years	52 of 100 (Notable)
21 September 2023	Ust-Vojampolka, RU	daily rain	27.9 mm (1.1 in)	16.6 mm (0.7 in)	38 years	50 of 100 (Notable)
21 September 2023	Morioka, JP	daily rain	90.9 mm (3.6 in)	59.9 mm (2.4 in)	12 years	46 of 100 (Notable)
21 September 2023	Brownsville, US	daily high max	37.2 C (99.0 F)	1.6 C (2.9 F)	122 years	46 of 100 (Notable)
21 September 2023	Osijek, HR	daily high min	18.7 C (65.7 F)	2.6 C (4.7 F)	96 years	45 of 100 (Notable)
21 September 2023	Purdum, US	daily rain	38.1 mm (1.5 in)	18.0 mm (0.7 in)	57 years	42 of 100 (Notable)
21 September 2023	Lunner, NO	daily rain	36.0 mm (1.4 in)	12.5 mm (0.5 in)	53 years	41 of 100 (Notable)
21 September 2023	Melsom, NO	daily rain	43.1 mm (1.7 in)	19.3 mm (0.8 in)	53 years	41 of 100 (Notable)
21 September 2023	Boras, SE	daily high max	24.1 C (75.4 F)	0.6 C (1.1 F)	120 years	41 of 100 (Notable)
21 September 2023	Port Alsworth, US	daily rain	32.5 mm (1.3 in)	15.5 mm (0.6 in)	45 years	41 of 100 (Notable)
21 September 2023	Uppsala_Aut, SE	daily high max	22.6 C (72.7 F)	0.3 C (0.5 F)	164 years	40 of 100 (Notable)
21 September 2023	Valentine Miller Fld AP, US	daily rain	42.7 mm (1.7 in)	25.4 mm (1.0 in)	16 years	40 of 100 (Notable)
21 September 2023	Archerfield Airport, AU	daily high max	34.9 C (94.8 F)	2.3 C (4.1 F)	80 years	39 of 100 (Notable)
21 September 2023	Halmstad Flygflottilj, SE	daily high min	16.4 C (61.5 F)	3.1 C (5.6 F)	77 years	39 of 100 (Notable)
21 September 2023	Stockholm, SE	daily high min	15.7 C (60.3 F)	2.3 C (4.1 F)	76 years	39 of 100 (Notable)

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

1805 to 2023

Records set or tied on this calendar date in each year from 1805 to 2023. 2023 had 783 records.

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

Records on 09-21 in each year
Year	Records
1805	1
1812	1
1825	2
1840	1
1841	1
1842	1
1848	1
1854	1
1856	2
1868	1
1872	2
1873	1
1877	1
1878	1
1881	1
1882	1
1884	1
1886	1
1888	2
1889	1
1891	10
1892	1
1893	10
1894	2
1895	3
1896	2
1897	6
1898	6
1899	3
1900	2
1901	5
1902	5
1903	8
1904	20
1905	12
1906	17
1907	10
1908	17
1909	10
1910	8
1911	18
1912	26
1913	37
1914	29
1915	34
1916	48
1917	28
1918	43
1919	54
1920	29
1921	64
1922	35
1923	232
1924	291
1925	278
1926	178
1927	165
1928	81
1929	232
1930	82
1931	681
1932	242
1933	193
1934	492
1935	199
1936	329
1937	487
1938	508
1939	308
1940	908
1941	416
1942	291
1943	407
1944	413
1945	507
1946	176
1947	534
1948	301
1949	298
1950	334
1951	241
1952	430
1953	382
1954	453
1955	752
1956	1,100
1957	366
1958	588
1959	513
1960	418
1961	441
1962	1,085
1963	306
1964	374
1965	1,088
1966	565
1967	577
1968	790
1969	593
1970	708
1971	645
1972	599
1973	421
1974	652
1975	528
1976	694
1977	918
1978	818
1979	736
1980	990
1981	696
1982	1,484
1983	2,207
1984	707
1985	796
1986	671
1987	965
1988	557
1989	1,002
1990	716
1991	1,021
1992	752
1993	911
1994	713
1995	2,002
1996	1,233
1997	1,112
1998	1,481
1999	1,025
2000	884
2001	718
2002	696
2003	959
2004	888
2005	1,143
2006	920
2007	742
2008	740
2009	715
2010	1,290
2011	542
2012	595
2013	769
2014	716
2015	565
2016	989
2017	1,178
2018	1,051
2019	833
2020	580
2021	465
2022	1,049
2023	783
2024	470
2025	591
2026	478

Download the Data

Data for records on 2023-09-21: 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 2026-10-15 (15 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 20	659
20 to 40	11
40 to 60	2
60 to 80	1
80 to 100	1
100 to 120	0
120 to 140	2