Weather Records on 18 September 2021

582 weather records were set or tied worldwide on 18 September 2021. Highest significance: Portland, US.

Key Facts for 18 September 2021

On 18 September 2021, 582 weather records were set or tied at long-record stations worldwide.
343 were record highs and 46 were record lows, counting maximum and minimum temperature.
By timescale, 1 were all-time records, 11 monthly and 570 daily.
Portland set a daily record precipitation of 87.9 mm (3.5 in) on 18 September 2021.
Across 163 earlier years (1803 to 2026) the same calendar date averaged 420 records.

Record Map

582 stations

582 station records on 18 September 2021 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 September 2021: highest significance records shown on the map
Station	Country	Type	Value	Significance
Portland	United States	Record daily precipitation	87.9 mm (3.5 in)	71 of 100 (Major)
Konotop	Ukraine	Record daily precipitation	50.0 mm (2.0 in)	69 of 100 (Major)
Sandpoint Exp STN	United States	Record daily precipitation	50.8 mm (2.0 in)	57 of 100 (Notable)
Roseburg Rgnl AP	United States	Record daily precipitation	31.2 mm (1.2 in)	57 of 100 (Notable)
Forks 1 E	United States	Record daily precipitation	62.2 mm (2.4 in)	56 of 100 (Notable)
Clearbrook	United States	Record daily precipitation	41.9 mm (1.6 in)	53 of 100 (Notable)
Anyang	China	Record daily precipitation	75.7 mm (3.0 in)	52 of 100 (Notable)
Rivne	Ukraine	Record daily precipitation	40.9 mm (1.6 in)	52 of 100 (Notable)
Harvey 4NE	United States	Record daily precipitation	38.9 mm (1.5 in)	52 of 100 (Notable)
Potato Hill	United States	Record daily precipitation	50.8 mm (2.0 in)	52 of 100 (Notable)
Athens	United States	Record daily precipitation	101.6 mm (4.0 in)	51 of 100 (Notable)
Headworks Portland Wtr B	United States	Record daily precipitation	72.1 mm (2.8 in)	51 of 100 (Notable)
Krasnaja_Gora	Russia	Record daily precipitation	39.1 mm (1.5 in)	48 of 100 (Notable)
Otis 2 NE	United States	Record daily precipitation	57.7 mm (2.3 in)	46 of 100 (Notable)
Podor	Senegal	Record daily precipitation	42.9 mm (1.7 in)	45 of 100 (Notable)
Seaside	United States	Record daily precipitation	49.3 mm (1.9 in)	45 of 100 (Notable)
Bellingham 3 SSW	United States	Record daily precipitation	40.1 mm (1.6 in)	45 of 100 (Notable)
Arecibo Obsy	Puerto Rico [United States]	Record daily precipitation	126.7 mm (5.0 in)	44 of 100 (Notable)
Concrete Ppl Fish STN	United States	Record daily precipitation	57.9 mm (2.3 in)	44 of 100 (Notable)
Kushiro	Japan	Record daily precipitation	181.1 mm (7.1 in)	43 of 100 (Notable)
Humptulips Salmon Hatchery	United States	Record daily precipitation	92.7 mm (3.6 in)	43 of 100 (Notable)
Upper Baker Dam	United States	Record daily precipitation	86.4 mm (3.4 in)	43 of 100 (Notable)
Urakawa	Japan	Record daily precipitation	111.0 mm (4.4 in)	42 of 100 (Notable)
Berezovo	Russia	Record daily precipitation	27.9 mm (1.1 in)	42 of 100 (Notable)
Ponyri	Russia	Record daily precipitation	41.9 mm (1.6 in)	42 of 100 (Notable)
Dannemora	United States	Record high minimum temperature	18.3 C (64.9 F)	42 of 100 (Notable)
Willamina	United States	Record daily precipitation	29.2 mm (1.1 in)	42 of 100 (Notable)
Culbertson	United States	Record high maximum temperature	35.6 C (96.1 F)	41 of 100 (Notable)
N'Guigni	Niger	Record high minimum temperature	27.8 C (82.0 F)	40 of 100 (Notable)
Krivoj_Rog	Ukraine	Record daily precipitation	38.1 mm (1.5 in)	40 of 100 (Notable)
Calera	United States	Record daily precipitation	76.2 mm (3.0 in)	40 of 100 (Notable)
Mystic Lake	United States	Record high minimum temperature	16.1 C (61.0 F)	40 of 100 (Notable)
Osaka	Japan	Record daily precipitation	43.4 mm (1.7 in)	39 of 100 (Notable)
Turnu Magurele	Romania	Record high minimum temperature	20.1 C (68.2 F)	39 of 100 (Notable)
Selma	United States	Record high minimum temperature	23.9 C (75.0 F)	39 of 100 (Notable)
Dismal Swamp	United States	Record daily precipitation	30.5 mm (1.2 in)	39 of 100 (Notable)
Borzja	Russia	Record low maximum temperature	6.5 C (43.7 F)	38 of 100 (Notable)
Sedro-Woolley	United States	Record daily precipitation	47.2 mm (1.9 in)	38 of 100 (Notable)
Ofunato	Japan	Record daily precipitation	189.0 mm (7.4 in)	37 of 100 (Notable)
Minden	United States	Record high minimum temperature	25.0 C (77.0 F)	37 of 100 (Notable)
Elma	United States	Record daily precipitation	39.1 mm (1.5 in)	37 of 100 (Notable)
Longview	United States	Record daily precipitation	27.9 mm (1.1 in)	37 of 100 (Notable)
Spirit Lake	United States	Record daily precipitation	73.7 mm (2.9 in)	37 of 100 (Notable)
Gadsden	United States	Record daily precipitation	88.9 mm (3.5 in)	36 of 100 (Notable)
Columbia	United States	Record high minimum temperature	26.1 C (79.0 F)	36 of 100 (Notable)
Wakayama	Japan	Record daily precipitation	108.5 mm (4.3 in)	35 of 100 (Notable)
St Joseph 3 N	United States	Record high minimum temperature	24.4 C (75.9 F)	35 of 100 (Notable)
Boonton 1 SE	United States	Record high minimum temperature	19.4 C (66.9 F)	35 of 100 (Notable)
Sheridan Fld STN	United States	Record high maximum temperature	34.4 C (93.9 F)	35 of 100 (Notable)
Puerto Limon	Costa Rica	Record low minimum temperature	19.1 C (66.4 F)	34 of 100 (Routine)
Shelbyville Water Dept	United States	Record daily precipitation	87.1 mm (3.4 in)	34 of 100 (Routine)
Escalante	United States	Record high minimum temperature	14.4 C (57.9 F)	34 of 100 (Routine)
Kirovohrad	Ukraine	Record daily precipitation	43.9 mm (1.7 in)	33 of 100 (Routine)
Sheep Canyon	United States	Record daily precipitation	91.4 mm (3.6 in)	33 of 100 (Routine)
Trubcevsk	Russia	Record daily precipitation	46.0 mm (1.8 in)	32 of 100 (Routine)
Dickson	United States	Record daily precipitation	47.2 mm (1.9 in)	32 of 100 (Routine)
Merwin Dam	United States	Record daily precipitation	50.8 mm (2.0 in)	32 of 100 (Routine)
Delta	United States	Record high minimum temperature	15.0 C (59.0 F)	32 of 100 (Routine)
Tokyo	Japan	Record daily precipitation	69.6 mm (2.7 in)	31 of 100 (Routine)
Kosice	Slovakia	Record daily precipitation	26.4 mm (1.0 in)	31 of 100 (Routine)

Counts by Type and Timescale

582 records

Records set or tied on 18 September 2021 by type: Highest daily maximum 141, Lowest daily maximum 28, Highest daily minimum 202, Lowest daily minimum 18, Heaviest daily rainfall 193.

Records on 18 September 2021 by type
Record type	Records
Highest daily maximum	141
Lowest daily maximum	28
Highest daily minimum	202
Lowest daily minimum	18
Heaviest daily rainfall	193
Heaviest daily snowfall	0
Deepest snow cover	0

Records on 18 September 2021 by timescale: all-time 1, monthly 11, daily 570.

How Much Records Were Beaten By

428 broken records

Margins by which the 428 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 59.2. Ties are not counted.

Top 20 by Significance

18 September 2021

Top 20 records on 18 September 2021 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 September 2021	Portland, US	daily rain	87.9 mm (3.5 in)	55.1 mm (2.2 in)	103 years	71 of 100 (Major)
18 September 2021	Konotop, UA	daily rain	50.0 mm (2.0 in)	34.9 mm (1.4 in)	72 years	69 of 100 (Major)
18 September 2021	Sandpoint Exp STN, US	daily rain	50.8 mm (2.0 in)	33.0 mm (1.3 in)	24 years	57 of 100 (Notable)
18 September 2021	Roseburg Rgnl AP, US	daily rain	31.2 mm (1.2 in)	13.7 mm (0.5 in)	84 years	57 of 100 (Notable)
18 September 2021	Forks 1 E, US	daily rain	62.2 mm (2.4 in)	29.4 mm (1.2 in)	90 years	56 of 100 (Notable)
18 September 2021	Clearbrook, US	daily rain	41.9 mm (1.6 in)	12.9 mm (0.5 in)	107 years	53 of 100 (Notable)
18 September 2021	Anyang, CN	daily rain	75.7 mm (3.0 in)	58.8 mm (2.3 in)	18 years	52 of 100 (Notable)
18 September 2021	Rivne, UA	daily rain	40.9 mm (1.6 in)	30.0 mm (1.2 in)	23 years	52 of 100 (Notable)
18 September 2021	Harvey 4NE, US	daily rain	38.9 mm (1.5 in)	23.2 mm (0.9 in)	67 years	52 of 100 (Notable)
18 September 2021	Potato Hill, US	daily rain	50.8 mm (2.0 in)	35.6 mm (1.4 in)	39 years	52 of 100 (Notable)
18 September 2021	Athens, US	daily rain	101.6 mm (4.0 in)	59.2 mm (2.3 in)	27 years	51 of 100 (Notable)
18 September 2021	Headworks Portland Wtr B, US	daily rain	72.1 mm (2.8 in)	31.2 mm (1.2 in)	52 years	51 of 100 (Notable)
18 September 2021	Krasnaja_Gora, RU	daily rain	39.1 mm (1.5 in)	13.3 mm (0.5 in)	64 years	48 of 100 (Notable)
18 September 2021	Otis 2 NE, US	daily rain	57.7 mm (2.3 in)	29.0 mm (1.1 in)	52 years	46 of 100 (Notable)
18 September 2021	Podor, SN	daily rain	42.9 mm (1.7 in)	13.6 mm (0.5 in)	94 years	45 of 100 (Notable)
18 September 2021	Seaside, US	daily rain	49.3 mm (1.9 in)	22.9 mm (0.9 in)	52 years	45 of 100 (Notable)
18 September 2021	Bellingham 3 SSW, US	daily rain	40.1 mm (1.6 in)	29.2 mm (1.1 in)	11 years	45 of 100 (Notable)
18 September 2021	Arecibo Obsy, PR	daily rain	126.7 mm (5.0 in)	53.0 mm (2.1 in)	36 years	44 of 100 (Notable)
18 September 2021	Concrete Ppl Fish STN, US	daily rain	57.9 mm (2.3 in)	19.5 mm (0.8 in)	52 years	44 of 100 (Notable)
18 September 2021	Kushiro, JP	all-time rain	181.1 mm (7.1 in)	11.6 mm (0.5 in)	35 years	43 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

1803 to 2021

Records set or tied on this calendar date in each year from 1803 to 2021. 2021 had 582 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 2021-09-18: 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 2026-10-16. Last revised 16 October 2026 (2026-10-16).

Margin	Records
0 to 10	348
10 to 20	46
20 to 30	16
30 to 40	9
40 to 50	5
50 to 60	4