Weather Records on 17 September 2021

345 weather records were set or tied worldwide on 17 September 2021. Highest significance: Tabora Airport, TZ.

Key Facts for 17 September 2021

On 17 September 2021, 345 weather records were set or tied at long-record stations worldwide.
206 were record highs and 59 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 3 monthly and 342 daily.
Tabora Airport set a monthly record daily precipitation of 99.1 mm (3.9 in) on 17 September 2021.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 423 records.

Record Map

345 stations

345 station records on 17 September 2021 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 September 2021: highest significance records shown on the map
Station	Country	Type	Value	Significance
Tabora Airport	Tanzania	Record daily precipitation	99.1 mm (3.9 in)	68 of 100 (Major)
Ville Platte	United States	Record daily precipitation	123.2 mm (4.9 in)	56 of 100 (Notable)
Lviv	Ukraine	Record daily precipitation	49.0 mm (1.9 in)	54 of 100 (Notable)
Blaine	United States	Record daily precipitation	43.7 mm (1.7 in)	52 of 100 (Notable)
Gopalpur	India	Record daily precipitation	90.9 mm (3.6 in)	51 of 100 (Notable)
Wiggins	United States	Record daily precipitation	139.7 mm (5.5 in)	49 of 100 (Notable)
Eastman 1 W	United States	Record daily precipitation	61.0 mm (2.4 in)	47 of 100 (Notable)
Lucknow/Amausi	India	Record daily precipitation	128.0 mm (5.0 in)	44 of 100 (Notable)
Donaldsonville 4 SW	United States	Record high minimum temperature	25.6 C (78.1 F)	42 of 100 (Notable)
Leakesville 6 WSW	United States	Record daily precipitation	51.6 mm (2.0 in)	42 of 100 (Notable)
Bellingham Intl AP	United States	Record daily precipitation	36.8 mm (1.4 in)	42 of 100 (Notable)
Del Norte 3ENE	United States	Record high maximum temperature	27.2 C (81.0 F)	41 of 100 (Notable)
Tizi Ouzou	Algeria	Record high minimum temperature	23.2 C (73.8 F)	40 of 100 (Notable)
Demopolis L&D	United States	Record daily precipitation	76.2 mm (3.0 in)	40 of 100 (Notable)
Quillayute AP	United States	Record daily precipitation	77.5 mm (3.1 in)	40 of 100 (Notable)
Kassler	United States	Record high maximum temperature	33.9 C (93.0 F)	39 of 100 (Notable)
Adina	Australia	Record daily precipitation	25.0 mm (1.0 in)	38 of 100 (Notable)
Betatakin	United States	Record high minimum temperature	18.9 C (66.0 F)	37 of 100 (Notable)
Stevensville 2SW	United States	Record high minimum temperature	22.2 C (72.0 F)	37 of 100 (Notable)
Izuhara	Japan	Record daily precipitation	150.9 mm (5.9 in)	36 of 100 (Notable)
Iskenderun	Turkey	Record daily precipitation	50.0 mm (2.0 in)	35 of 100 (Notable)
Bartlett 1W	United States	Record daily precipitation	31.0 mm (1.2 in)	35 of 100 (Notable)
Broome Airport	Australia	Record high minimum temperature	24.5 C (76.1 F)	34 of 100 (Routine)
Krasnaja_Gora	Russia	Record daily precipitation	34.0 mm (1.3 in)	34 of 100 (Routine)
Saint Charles	United States	Record high minimum temperature	22.8 C (73.0 F)	34 of 100 (Routine)
Niamey Aero	Niger	Record daily precipitation	47.0 mm (1.9 in)	33 of 100 (Routine)
Silverton	United States	Record daily precipitation	27.4 mm (1.1 in)	33 of 100 (Routine)
Kaneohe Bay MCAS	United States	Record low maximum temperature	26.1 C (79.0 F)	33 of 100 (Routine)
Adelaide West Terrace	Australia	Record high minimum temperature	17.4 C (63.3 F)	32 of 100 (Routine)
Okecie	Poland	Record high minimum temperature	14.2 C (57.6 F)	32 of 100 (Routine)
Valley	United Kingdom	Record high minimum temperature	15.9 C (60.6 F)	32 of 100 (Routine)
Cascade Locks	United States	Record low minimum temperature	4.4 C (39.9 F)	32 of 100 (Routine)
Dunkirk Chautauqua Co AP	United States	Record high maximum temperature	28.3 C (82.9 F)	32 of 100 (Routine)
Parafield Airport	Australia	Record high minimum temperature	16.5 C (61.7 F)	31 of 100 (Routine)
Guadalajara	Mexico	Record high minimum temperature	18.0 C (64.4 F)	30 of 100 (Routine)
Elephant Butte Dam	United States	Record high maximum temperature	35.6 C (96.1 F)	30 of 100 (Routine)
Tacoma #1	United States	Record daily precipitation	31.5 mm (1.2 in)	30 of 100 (Routine)
Headland	United States	Record high minimum temperature	23.9 C (75.0 F)	29 of 100 (Routine)
Mora	United States	Record daily precipitation	44.2 mm (1.7 in)	28 of 100 (Routine)
Shanwei	China	Record high maximum temperature	34.4 C (93.9 F)	27 of 100 (Routine)
Warmun	Australia	Record high minimum temperature	28.5 C (83.3 F)	26 of 100 (Routine)
Knin	Croatia	Record daily precipitation	53.4 mm (2.1 in)	26 of 100 (Routine)
Sikasso	Mali	Record high minimum temperature	24.7 C (76.5 F)	26 of 100 (Routine)
Bruno 7ENE	United States	Record daily precipitation	38.4 mm (1.5 in)	26 of 100 (Routine)
Robe Comparison	Australia	Record low minimum temperature	2.7 C (36.9 F)	25 of 100 (Routine)
Cluj Napoca	Romania	Record high minimum temperature	16.4 C (61.5 F)	25 of 100 (Routine)
Kanchanaburi	Thailand	Record low minimum temperature	22.2 C (72.0 F)	25 of 100 (Routine)
Loma	United States	Record low minimum temperature	-2.8 C (27.0 F)	25 of 100 (Routine)
Soummam	Algeria	Record high minimum temperature	23.9 C (75.0 F)	24 of 100 (Routine)
Hawker	Australia	Record high minimum temperature	18.2 C (64.8 F)	24 of 100 (Routine)
Krasnaja_Gora	Russia	Record low maximum temperature	8.6 C (47.5 F)	24 of 100 (Routine)
Onamia Rs	United States	Record daily precipitation	29.7 mm (1.2 in)	24 of 100 (Routine)
Opheim 12 SSE	United States	Record low minimum temperature	-6.1 C (21.0 F)	24 of 100 (Routine)
Austin-Camp Mabry	United States	Record high maximum temperature	37.2 C (99.0 F)	24 of 100 (Routine)
Nantucket Mem AP	United States	Record high minimum temperature	20.0 C (68.0 F)	24 of 100 (Routine)
Kyzylorda	Kazakhstan	Record high maximum temperature	37.6 C (99.7 F)	23 of 100 (Routine)
Auchincruive	United Kingdom	Record high minimum temperature	14.5 C (58.1 F)	23 of 100 (Routine)
Richmond	United States	Record low maximum temperature	16.7 C (62.1 F)	23 of 100 (Routine)
Gunflint Lake 10 NW	United States	Record daily precipitation	41.9 mm (1.6 in)	23 of 100 (Routine)
Bradford Rgnl AP	United States	Record high minimum temperature	17.8 C (64.0 F)	23 of 100 (Routine)

Counts by Type and Timescale

345 records

Records set or tied on 17 September 2021 by type: Highest daily maximum 75, Lowest daily maximum 18, Highest daily minimum 131, Lowest daily minimum 41, Heaviest daily rainfall 80.

Records on 17 September 2021 by type
Record type	Records
Highest daily maximum	75
Lowest daily maximum	18
Highest daily minimum	131
Lowest daily minimum	41
Heaviest daily rainfall	80
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 17 September 2021 by timescale: all-time 0, monthly 3, daily 342.

How Much Records Were Beaten By

260 broken records

Margins by which the 260 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 111.8. Ties are not counted.

Top 20 by Significance

17 September 2021

Top 20 records on 17 September 2021 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 September 2021	Tabora Airport, TZ	monthly rain	99.1 mm (3.9 in)	75.1 mm (3.0 in)	39 years	68 of 100 (Major)
17 September 2021	Ville Platte, US	daily rain	123.2 mm (4.9 in)	49.5 mm (1.9 in)	78 years	56 of 100 (Notable)
17 September 2021	Lviv, UA	daily rain	49.0 mm (1.9 in)	27.5 mm (1.1 in)	20 years	54 of 100 (Notable)
17 September 2021	Blaine, US	daily rain	43.7 mm (1.7 in)	20.3 mm (0.8 in)	51 years	52 of 100 (Notable)
17 September 2021	Gopalpur, IN	daily rain	90.9 mm (3.6 in)	50.8 mm (2.0 in)	67 years	51 of 100 (Notable)
17 September 2021	Wiggins, US	daily rain	139.7 mm (5.5 in)	111.8 mm (4.4 in)	7 years	49 of 100 (Notable)
17 September 2021	Eastman 1 W, US	daily rain	61.0 mm (2.4 in)	13.0 mm (0.5 in)	126 years	47 of 100 (Notable)
17 September 2021	Lucknow/Amausi, IN	daily rain	128.0 mm (5.0 in)	74.7 mm (2.9 in)	51 years	44 of 100 (Notable)
17 September 2021	Donaldsonville 4 SW, US	daily high min	25.6 C (78.1 F)	1.2 C (2.2 F)	94 years	42 of 100 (Notable)
17 September 2021	Leakesville 6 WSW, US	daily rain	51.6 mm (2.0 in)	12.7 mm (0.5 in)	92 years	42 of 100 (Notable)
17 September 2021	Bellingham Intl AP, US	daily rain	36.8 mm (1.4 in)	13.2 mm (0.5 in)	51 years	42 of 100 (Notable)
17 September 2021	Del Norte 3ENE, US	daily high max	27.2 C (81.0 F)	0.5 C (0.9 F)	100 years	41 of 100 (Notable)
17 September 2021	Tizi Ouzou, DZ	daily high min	23.2 C (73.8 F)	0.2 C (0.4 F)	110 years	40 of 100 (Notable)
17 September 2021	Demopolis L&D, US	daily rain	76.2 mm (3.0 in)	34.3 mm (1.4 in)	42 years	40 of 100 (Notable)
17 September 2021	Quillayute AP, US	daily rain	77.5 mm (3.1 in)	27.5 mm (1.1 in)	55 years	40 of 100 (Notable)
17 September 2021	Kassler, US	daily high max	33.9 C (93.0 F)	0.6 C (1.1 F)	96 years	39 of 100 (Notable)
17 September 2021	Adina, AU	daily rain	25.0 mm (1.0 in)	12.2 mm (0.5 in)	46 years	38 of 100 (Notable)
17 September 2021	Betatakin, US	daily high min	18.9 C (66.0 F)	2.2 C (4.0 F)	79 years	37 of 100 (Notable)
17 September 2021	Stevensville 2SW, US	daily high min	22.2 C (72.0 F)	0.5 C (0.9 F)	91 years	37 of 100 (Notable)
17 September 2021	Izuhara, JP	daily rain	150.9 mm (5.9 in)	54.4 mm (2.1 in)	46 years	36 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

1796 to 2021

Records set or tied on this calendar date in each year from 1796 to 2021. 2021 had 345 records.

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

Records on 09-17 in each year
Year	Records
1796	1
1797	1
1805	1
1833	1
1834	1
1837	2
1845	1
1847	3
1848	1
1850	1
1851	2
1853	2
1854	2
1859	1
1862	1
1867	1
1870	1
1871	1
1872	1
1873	1
1874	1
1875	1
1877	1
1881	1
1882	2
1884	3
1885	3
1886	6
1888	2
1889	8
1891	1
1893	3
1894	1
1895	4
1896	9
1897	4
1898	7
1899	1
1900	4
1901	5
1902	5
1903	28
1904	2
1905	17
1906	10
1907	15
1908	13
1909	7
1910	38
1911	15
1912	17
1913	28
1914	38
1915	48
1916	40
1917	255
1918	41
1919	21
1920	40
1921	66
1922	47
1923	159
1924	80
1925	338
1926	154
1927	420
1928	78
1929	168
1930	147
1931	564
1932	425
1933	415
1934	246
1935	321
1936	219
1937	463
1938	363
1939	294
1940	326
1941	328
1942	581
1943	513
1944	403
1945	614
1946	620
1947	680
1948	630
1949	292
1950	412
1951	359
1952	263
1953	344
1954	449
1955	649
1956	437
1957	405
1958	806
1959	1,210
1960	385
1961	657
1962	432
1963	297
1964	559
1965	1,394
1966	523
1967	331
1968	691
1969	352
1970	412
1971	898
1972	556
1973	638
1974	491
1975	478
1976	636
1977	641
1978	764
1979	804
1980	794
1981	1,155
1982	606
1983	862
1984	1,006
1985	448
1986	1,314
1987	926
1988	982
1989	863
1990	650
1991	1,407
1992	686
1993	950
1994	986
1995	1,145
1996	1,342
1997	1,057
1998	1,137
1999	1,102
2000	1,318
2001	895
2002	1,025
2003	586
2004	872
2005	1,042
2006	1,344
2007	752
2008	886
2009	871
2010	907
2011	1,116
2012	597
2013	1,253
2014	571
2015	953
2016	707
2017	455
2018	899
2019	774
2020	651
2021	345
2022	313
2023	646
2024	954
2025	634
2026	968

Download the Data

Data for records on 2021-09-17: 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 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 20	248
20 to 40	5
40 to 60	4
60 to 80	2
80 to 100	0
100 to 120	1