Weather Records on 17 September 1987

926 weather records were set or tied worldwide on 17 September 1987. Highest significance: Lourensgeluk, ZA.

Key Facts for 17 September 1987

On 17 September 1987, 926 weather records were set or tied at long-record stations worldwide.
542 were record highs and 121 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 34 monthly and 890 daily.
Lourensgeluk set a monthly record daily precipitation of 75.0 mm (3.0 in) on 17 September 1987.
Across 164 earlier years (1796 to 2026) the same calendar date averaged 420 records.

Record Map

926 stations

926 station records on 17 September 1987 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 17 September 1987: highest significance records shown on the map
Station	Country	Type	Value	Significance
Lourensgeluk	South Africa	Record daily precipitation	75.0 mm (3.0 in)	63 of 100 (Major)
Skovorodino	Russia	Record daily precipitation	87.9 mm (3.5 in)	60 of 100 (Major)
Aurora Water	United States	Record daily precipitation	78.2 mm (3.1 in)	58 of 100 (Notable)
Werk-Met-Lus	South Africa	Record daily precipitation	35.5 mm (1.4 in)	54 of 100 (Notable)
Rietpan II	South Africa	Record daily precipitation	42.0 mm (1.7 in)	52 of 100 (Notable)
Guttenberg L&D 10	United States	Record daily precipitation	74.9 mm (2.9 in)	52 of 100 (Notable)
Bijsk Zonalnaja	Russia	Record daily precipitation	25.9 mm (1.0 in)	46 of 100 (Notable)
Tiskilwa 2 SE	United States	Record daily precipitation	41.9 mm (1.6 in)	46 of 100 (Notable)
Kewaunee	United States	Record daily precipitation	46.2 mm (1.8 in)	46 of 100 (Notable)
Tlacotepec de Benito Juarez	Mexico	Record high maximum temperature	35.6 C (96.1 F)	45 of 100 (Notable)
Froyset	Norway	Record daily precipitation	89.7 mm (3.5 in)	45 of 100 (Notable)
Kystovka	Russia	Record daily precipitation	30.9 mm (1.2 in)	45 of 100 (Notable)
Portage Wwtp	United States	Record daily precipitation	45.7 mm (1.8 in)	45 of 100 (Notable)
Alton	United States	Record daily precipitation	71.9 mm (2.8 in)	44 of 100 (Notable)
Saentis	Switzerland	Record high minimum temperature	11.1 C (52.0 F)	43 of 100 (Notable)
Bowler	United States	Record daily precipitation	53.3 mm (2.1 in)	43 of 100 (Notable)
Katon-Karagaj	Kazakhstan	Record daily precipitation	33.4 mm (1.3 in)	41 of 100 (Notable)
Nashville 1 E	United States	Record daily precipitation	58.4 mm (2.3 in)	41 of 100 (Notable)
Hartington	United States	Record daily precipitation	38.6 mm (1.5 in)	41 of 100 (Notable)
Nicosia	Cyprus	Record high minimum temperature	23.9 C (75.0 F)	39 of 100 (Notable)
Freiburg	Germany	Record high minimum temperature	17.4 C (63.3 F)	39 of 100 (Notable)
Beaver Dam Wwtp	United States	Record daily precipitation	53.6 mm (2.1 in)	39 of 100 (Notable)
Astolfo Dutra	Brazil	Record daily precipitation	32.0 mm (1.3 in)	38 of 100 (Notable)
Sac City	United States	Record daily precipitation	30.7 mm (1.2 in)	38 of 100 (Notable)
Cambridge	United States	Record daily precipitation	50.8 mm (2.0 in)	37 of 100 (Notable)
Ashland	United States	Record low minimum temperature	1.1 C (34.0 F)	37 of 100 (Notable)
Sparta 1 W	United States	Record daily precipitation	59.2 mm (2.3 in)	36 of 100 (Notable)
Storm Lake	United States	Record daily precipitation	65.8 mm (2.6 in)	36 of 100 (Notable)
Ashland	United States	Record high minimum temperature	21.1 C (70.0 F)	36 of 100 (Notable)
La Union	Mexico	Record daily precipitation	144.8 mm (5.7 in)	35 of 100 (Notable)
Takle	Norway	Record daily precipitation	95.7 mm (3.8 in)	35 of 100 (Notable)
Lavik	Norway	Record daily precipitation	76.1 mm (3.0 in)	35 of 100 (Notable)
Guaimbe	Brazil	Record daily precipitation	89.7 mm (3.5 in)	34 of 100 (Routine)
A Coruna	Spain	Record high minimum temperature	20.2 C (68.4 F)	34 of 100 (Routine)
Cristina	Brazil	Record daily precipitation	35.0 mm (1.4 in)	33 of 100 (Routine)
Orebro	Sweden	Record low minimum temperature	-1.5 C (29.3 F)	33 of 100 (Routine)
Ottawa 4SW	United States	Record daily precipitation	94.7 mm (3.7 in)	33 of 100 (Routine)
Lawton	United States	Record daily precipitation	43.2 mm (1.7 in)	33 of 100 (Routine)
Carrizo Springs 3S	United States	Record high minimum temperature	25.6 C (78.1 F)	33 of 100 (Routine)
Stoughton Wwtp	United States	Record daily precipitation	44.5 mm (1.8 in)	33 of 100 (Routine)
Watertown Wwtp	United States	Record daily precipitation	67.6 mm (2.7 in)	33 of 100 (Routine)
Harrisburg Capital City AP	United States	Record daily precipitation	53.6 mm (2.1 in)	33 of 100 (Routine)
Annette AP	United States	Record daily precipitation	66.3 mm (2.6 in)	33 of 100 (Routine)
Garden City	United States	Record daily precipitation	48.3 mm (1.9 in)	31 of 100 (Routine)
Clintonville	United States	Record daily precipitation	46.2 mm (1.8 in)	31 of 100 (Routine)
Lake Mills Wwtp	United States	Record daily precipitation	35.8 mm (1.4 in)	31 of 100 (Routine)
Petersburg 1	United States	Record daily precipitation	57.2 mm (2.3 in)	31 of 100 (Routine)
Miyako	Japan	Record daily precipitation	174.5 mm (6.9 in)	30 of 100 (Routine)
Manati 2 E	Puerto Rico [United States]	Record high minimum temperature	23.3 C (73.9 F)	30 of 100 (Routine)
Santander Centro	Spain	Record high maximum temperature	36.8 C (98.2 F)	30 of 100 (Routine)
Avon	United States	Record daily precipitation	72.6 mm (2.9 in)	30 of 100 (Routine)
Cedar Rapids #1	United States	Record daily precipitation	28.7 mm (1.1 in)	30 of 100 (Routine)
Conroe	United States	Record high minimum temperature	23.9 C (75.0 F)	30 of 100 (Routine)
Matias Romero (Smn)	Mexico	Record high maximum temperature	37.8 C (100.0 F)	29 of 100 (Routine)
Brekke I Sogn	Norway	Record daily precipitation	120.4 mm (4.7 in)	29 of 100 (Routine)
McCall	United States	Record low minimum temperature	-6.7 C (19.9 F)	29 of 100 (Routine)
Cascade	United States	Record daily precipitation	44.2 mm (1.7 in)	29 of 100 (Routine)
Kailua 446	United States	Record high minimum temperature	22.8 C (73.0 F)	29 of 100 (Routine)
Pte de Chassiron	France	Record high minimum temperature	20.2 C (68.4 F)	28 of 100 (Routine)
Apatzingan (Smn)	Mexico	Record daily precipitation	81.8 mm (3.2 in)	28 of 100 (Routine)

Counts by Type and Timescale

926 records

Records set or tied on 17 September 1987 by type: Highest daily maximum 241, Lowest daily maximum 33, Highest daily minimum 301, Lowest daily minimum 88, Heaviest daily rainfall 262, Deepest snow cover 1.

Records on 17 September 1987 by type
Record type	Records
Highest daily maximum	241
Lowest daily maximum	33
Highest daily minimum	301
Lowest daily minimum	88
Heaviest daily rainfall	262
Heaviest daily snowfall	0
Deepest snow cover	1

Records on 17 September 1987 by timescale: all-time 2, monthly 34, daily 890.

How Much Records Were Beaten By

696 broken records

Margins by which the 696 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 65.5. Ties are not counted.

Top 20 by Significance

17 September 1987

Top 20 records on 17 September 1987 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 September 1987	Lourensgeluk, ZA	monthly rain	75.0 mm (3.0 in)	35.0 mm (1.4 in)	30 years	63 of 100 (Major)
17 September 1987	Skovorodino, RU	monthly rain	87.9 mm (3.5 in)	44.9 mm (1.8 in)	11 years	60 of 100 (Major)
17 September 1987	Aurora Water, US	daily rain	78.2 mm (3.1 in)	47.0 mm (1.9 in)	60 years	58 of 100 (Notable)
17 September 1987	Werk-Met-Lus, ZA	daily rain	35.5 mm (1.4 in)	26.9 mm (1.1 in)	57 years	54 of 100 (Notable)
17 September 1987	Rietpan II, ZA	daily rain	42.0 mm (1.7 in)	29.3 mm (1.2 in)	57 years	52 of 100 (Notable)
17 September 1987	Guttenberg L&D 10, US	daily rain	74.9 mm (2.9 in)	56.6 mm (2.2 in)	24 years	52 of 100 (Notable)
17 September 1987	Bijsk Zonalnaja, RU	daily rain	25.9 mm (1.0 in)	16.3 mm (0.6 in)	32 years	46 of 100 (Notable)
17 September 1987	Tiskilwa 2 SE, US	daily rain	41.9 mm (1.6 in)	16.0 mm (0.6 in)	87 years	46 of 100 (Notable)
17 September 1987	Kewaunee, US	daily rain	46.2 mm (1.8 in)	18.3 mm (0.7 in)	76 years	46 of 100 (Notable)
17 September 1987	Tlacotepec de Benito Juarez, MX	monthly high max	35.6 C (96.1 F)	5.0 C (9.0 F)	38 years	45 of 100 (Notable)
17 September 1987	Froyset, NO	daily rain	89.7 mm (3.5 in)	53.3 mm (2.1 in)	8 years	45 of 100 (Notable)
17 September 1987	Kystovka, RU	daily rain	30.9 mm (1.2 in)	19.6 mm (0.8 in)	2 years	45 of 100 (Notable)
17 September 1987	Portage Wwtp, US	daily rain	45.7 mm (1.8 in)	16.5 mm (0.6 in)	82 years	45 of 100 (Notable)
17 September 1987	Alton, US	daily rain	71.9 mm (2.8 in)	16.8 mm (0.7 in)	80 years	44 of 100 (Notable)
17 September 1987	Saentis, CH	monthly high min	11.1 C (52.0 F)	0.6 C (1.1 F)	76 years	43 of 100 (Notable)
17 September 1987	Bowler, US	daily rain	53.3 mm (2.1 in)	37.0 mm (1.5 in)	26 years	43 of 100 (Notable)
17 September 1987	Katon-Karagaj, KZ	monthly rain	33.4 mm (1.3 in)	5.5 mm (0.22 in)	49 years	41 of 100 (Notable)
17 September 1987	Nashville 1 E, US	daily rain	58.4 mm (2.3 in)	15.2 mm (0.6 in)	74 years	41 of 100 (Notable)
17 September 1987	Hartington, US	daily rain	38.6 mm (1.5 in)	10.7 mm (0.4 in)	80 years	41 of 100 (Notable)
17 September 1987	Nicosia, CY	daily high min	23.9 C (75.0 F)	0.3 C (0.5 F)	94 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

1796 to 1987

Records set or tied on this calendar date in each year from 1796 to 1987. 1987 had 926 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 1987-09-17: 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 10	604
10 to 20	57
20 to 30	18
30 to 40	8
40 to 50	4
50 to 60	3
60 to 70	2