Weather Records on 21 September 1987

965 weather records were set or tied worldwide on 21 September 1987. Highest significance: Hanover (Pol), ZA.

Key Facts for 21 September 1987

On 21 September 1987, 965 weather records were set or tied at long-record stations worldwide.
502 were record highs and 76 were record lows, counting maximum and minimum temperature.
By timescale, 0 were all-time records, 33 monthly and 932 daily.
Hanover (Pol) set a daily record precipitation of 55.0 mm (2.2 in) on 21 September 1987.
Across 155 earlier years (1805 to 2026) the same calendar date averaged 448 records.

Record Map

965 stations

965 station records on 21 September 1987 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 21 September 1987: highest significance records shown on the map
Station	Country	Type	Value	Significance
Hanover (Pol)	South Africa	Record daily precipitation	55.0 mm (2.2 in)	79 of 100 (Major)
Altamura	South Africa	Record daily precipitation	58.0 mm (2.3 in)	66 of 100 (Major)
Witsieshoek	South Africa	Record daily precipitation	61.0 mm (2.4 in)	66 of 100 (Major)
Ust-Njukzha	Russia	Record daily precipitation	98.4 mm (3.9 in)	65 of 100 (Major)
Winburg (Pol)	South Africa	Record daily precipitation	42.0 mm (1.7 in)	62 of 100 (Major)
Ladybrand (Skl)	South Africa	Record daily precipitation	49.5 mm (1.9 in)	60 of 100 (Major)
N Wailua Ditch 1051	United States	Record daily precipitation	196.1 mm (7.7 in)	60 of 100 (Major)
Belfast	United States	Record daily precipitation	102.6 mm (4.0 in)	59 of 100 (Notable)
Sterkstroom (Pol)	South Africa	Record daily precipitation	32.5 mm (1.3 in)	58 of 100 (Notable)
Idomia	South Africa	Record daily precipitation	30.0 mm (1.2 in)	58 of 100 (Notable)
Driekop	South Africa	Record daily precipitation	51.0 mm (2.0 in)	58 of 100 (Notable)
Brakfontein	South Africa	Record daily precipitation	34.0 mm (1.3 in)	57 of 100 (Notable)
Philipstown (Tnk)	South Africa	Record daily precipitation	60.0 mm (2.4 in)	57 of 100 (Notable)
Tanhurst Est, Umzint	South Africa	Record daily precipitation	82.9 mm (3.3 in)	57 of 100 (Notable)
Mazelspoort Dam	South Africa	Record daily precipitation	37.7 mm (1.5 in)	56 of 100 (Notable)
Harrismith (Tnk)	South Africa	Record daily precipitation	28.0 mm (1.1 in)	56 of 100 (Notable)
Ellsworth	United States	Record daily precipitation	88.9 mm (3.5 in)	55 of 100 (Notable)
Sawoti	South Africa	Record daily precipitation	106.7 mm (4.2 in)	54 of 100 (Notable)
Intake	South Africa	Record daily precipitation	74.1 mm (2.9 in)	54 of 100 (Notable)
Umlaas Waterworks	South Africa	Record daily precipitation	97.4 mm (3.8 in)	54 of 100 (Notable)
Bergville (Mag)	South Africa	Record daily precipitation	54.0 mm (2.1 in)	54 of 100 (Notable)
Gardiner	United States	Record daily precipitation	59.4 mm (2.3 in)	54 of 100 (Notable)
Anna	Russia	Record daily precipitation	36.9 mm (1.5 in)	53 of 100 (Notable)
Colesberg (Tnk)	South Africa	Record daily precipitation	34.3 mm (1.4 in)	53 of 100 (Notable)
Eureka	South Africa	Record daily precipitation	78.0 mm (3.1 in)	53 of 100 (Notable)
Aberdeen (Tnk)	South Africa	Record daily precipitation	29.2 mm (1.1 in)	52 of 100 (Notable)
Oranjeoord	South Africa	Record daily precipitation	28.5 mm (1.1 in)	52 of 100 (Notable)
Kamennaja-Step	Russia	Record daily precipitation	49.6 mm (2.0 in)	51 of 100 (Notable)
Philadelphia	South Africa	Record daily precipitation	32.0 mm (1.3 in)	51 of 100 (Notable)
Swartkoppie	South Africa	Record daily precipitation	37.5 mm (1.5 in)	51 of 100 (Notable)
Kareehoek"Kareefontein"	South Africa	Record daily precipitation	51.2 mm (2.0 in)	50 of 100 (Notable)
Noupoort	South Africa	Record daily precipitation	30.5 mm (1.2 in)	50 of 100 (Notable)
Manor Holme	South Africa	Record daily precipitation	48.0 mm (1.9 in)	50 of 100 (Notable)
Hobhouse 23	South Africa	Record daily precipitation	42.0 mm (1.7 in)	50 of 100 (Notable)
Grootfontein 11,	South Africa	Record daily precipitation	38.2 mm (1.5 in)	49 of 100 (Notable)
Grapevale	South Africa	Record daily precipitation	60.5 mm (2.4 in)	49 of 100 (Notable)
Fort Donald (Bos)	South Africa	Record daily precipitation	32.5 mm (1.3 in)	49 of 100 (Notable)
Cromleigh,Ixopo	South Africa	Record daily precipitation	31.7 mm (1.2 in)	49 of 100 (Notable)
Hofmeyer (Mun)	South Africa	Record daily precipitation	49.5 mm (1.9 in)	48 of 100 (Notable)
Ebenezer (Weltevrede)	South Africa	Record daily precipitation	32.5 mm (1.3 in)	48 of 100 (Notable)
Van Reenen	South Africa	Record daily precipitation	40.0 mm (1.6 in)	48 of 100 (Notable)
Leliefontein	South Africa	Record daily precipitation	43.0 mm (1.7 in)	48 of 100 (Notable)
Svinoy Fyr	Norway	Record daily precipitation	44.8 mm (1.8 in)	47 of 100 (Notable)
Kon-Kolodez	Russia	Record daily precipitation	25.9 mm (1.0 in)	47 of 100 (Notable)
Merweville	South Africa	Record daily precipitation	34.0 mm (1.3 in)	47 of 100 (Notable)
Gordonville	South Africa	Record daily precipitation	25.5 mm (1.0 in)	47 of 100 (Notable)
Skilderkrans	South Africa	Record daily precipitation	60.5 mm (2.4 in)	47 of 100 (Notable)
The Valleys	South Africa	Record daily precipitation	77.5 mm (3.1 in)	47 of 100 (Notable)
Brandfort (Mag)	South Africa	Record daily precipitation	40.0 mm (1.6 in)	47 of 100 (Notable)
Keble	South Africa	Record daily precipitation	60.0 mm (2.4 in)	47 of 100 (Notable)
Shaoguan	China	Record daily precipitation	67.7 mm (2.7 in)	46 of 100 (Notable)
Basberg	South Africa	Record daily precipitation	40.0 mm (1.6 in)	46 of 100 (Notable)
Sumy	Ukraine	Record daily precipitation	25.0 mm (1.0 in)	46 of 100 (Notable)
Kloofend	South Africa	Record daily precipitation	74.7 mm (2.9 in)	45 of 100 (Notable)
Voronez	Russia	Record daily precipitation	39.7 mm (1.6 in)	44 of 100 (Notable)
Vergelegen	South Africa	Record daily precipitation	39.5 mm (1.6 in)	44 of 100 (Notable)
Insikeni (Bos)	South Africa	Record daily precipitation	45.0 mm (1.8 in)	44 of 100 (Notable)
Venterslaager, Bergv	South Africa	Record daily precipitation	54.0 mm (2.1 in)	43 of 100 (Notable)
Palmiet, Kokstad	South Africa	Record daily precipitation	27.9 mm (1.1 in)	42 of 100 (Notable)
Convamore	South Africa	Record daily precipitation	42.5 mm (1.7 in)	42 of 100 (Notable)

Counts by Type and Timescale

965 records

Records set or tied on 21 September 1987 by type: Highest daily maximum 341, Lowest daily maximum 28, Highest daily minimum 161, Lowest daily minimum 48, Heaviest daily rainfall 386, Heaviest daily snowfall 1.

Records on 21 September 1987 by type
Record type	Records
Highest daily maximum	341
Lowest daily maximum	28
Highest daily minimum	161
Lowest daily minimum	48
Heaviest daily rainfall	386
Heaviest daily snowfall	1
Deepest snow cover	0

Records on 21 September 1987 by timescale: all-time 0, monthly 33, daily 932.

How Much Records Were Beaten By

826 broken records

Margins by which the 826 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 94.2. Ties are not counted.

Top 20 by Significance

21 September 1987

Top 20 records on 21 September 1987 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
21 September 1987	Hanover (Pol), ZA	daily rain	55.0 mm (2.2 in)	38.7 mm (1.5 in)	98 years	79 of 100 (Major)
21 September 1987	Altamura, ZA	daily rain	58.0 mm (2.3 in)	52.2 mm (2.1 in)	61 years	66 of 100 (Major)
21 September 1987	Witsieshoek, ZA	daily rain	61.0 mm (2.4 in)	50.8 mm (2.0 in)	61 years	66 of 100 (Major)
21 September 1987	Ust-Njukzha, RU	monthly rain	98.4 mm (3.9 in)	59.4 mm (2.3 in)	35 years	65 of 100 (Major)
21 September 1987	Winburg (Pol), ZA	daily rain	42.0 mm (1.7 in)	36.2 mm (1.4 in)	42 years	62 of 100 (Major)
21 September 1987	Ladybrand (Skl), ZA	daily rain	49.5 mm (1.9 in)	36.5 mm (1.4 in)	46 years	60 of 100 (Major)
21 September 1987	N Wailua Ditch 1051, US	monthly rain	196.1 mm (7.7 in)	74.9 mm (2.9 in)	25 years	60 of 100 (Major)
21 September 1987	Belfast, US	daily rain	102.6 mm (4.0 in)	73.1 mm (2.9 in)	33 years	59 of 100 (Notable)
21 September 1987	Sterkstroom (Pol), ZA	daily rain	32.5 mm (1.3 in)	23.4 mm (0.9 in)	80 years	58 of 100 (Notable)
21 September 1987	Idomia, ZA	daily rain	30.0 mm (1.2 in)	30.0 mm (1.2 in)	72 years	58 of 100 (Notable)
21 September 1987	Driekop, ZA	daily rain	51.0 mm (2.0 in)	48.5 mm (1.9 in)	42 years	58 of 100 (Notable)
21 September 1987	Brakfontein, ZA	daily rain	34.0 mm (1.3 in)	16.2 mm (0.6 in)	80 years	57 of 100 (Notable)
21 September 1987	Philipstown (Tnk), ZA	daily rain	60.0 mm (2.4 in)	39.7 mm (1.6 in)	46 years	57 of 100 (Notable)
21 September 1987	Tanhurst Est, Umzint, ZA	daily rain	82.9 mm (3.3 in)	54.2 mm (2.1 in)	42 years	57 of 100 (Notable)
21 September 1987	Mazelspoort Dam, ZA	daily rain	37.7 mm (1.5 in)	21.7 mm (0.9 in)	80 years	56 of 100 (Notable)
21 September 1987	Harrismith (Tnk), ZA	daily rain	28.0 mm (1.1 in)	18.6 mm (0.7 in)	93 years	56 of 100 (Notable)
21 September 1987	Ellsworth, US	daily rain	88.9 mm (3.5 in)	70.6 mm (2.8 in)	26 years	55 of 100 (Notable)
21 September 1987	Sawoti, ZA	daily rain	106.7 mm (4.2 in)	88.7 mm (3.5 in)	26 years	54 of 100 (Notable)
21 September 1987	Intake, ZA	daily rain	74.1 mm (2.9 in)	64.1 mm (2.5 in)	26 years	54 of 100 (Notable)
21 September 1987	Umlaas Waterworks, ZA	daily rain	97.4 mm (3.8 in)	83.4 mm (3.3 in)	26 years	54 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 1987

Records set or tied on this calendar date in each year from 1805 to 1987. 1987 had 965 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	588
2026	469

Download the Data

Data for records on 1987-09-21: 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Margin	Records
0 to 20	743
20 to 40	65
40 to 60	11
60 to 80	4
80 to 100	3