Weather Records on 18 September 1986

730 weather records were set or tied worldwide on 18 September 1986. Highest significance: Chadron 3SW, US.

Key Facts for 18 September 1986

On 18 September 1986, 730 weather records were set or tied at long-record stations worldwide.
154 were record highs and 370 were record lows, counting maximum and minimum temperature.
By timescale, 2 were all-time records, 13 monthly and 715 daily.
Chadron 3SW set an all-time record daily precipitation of 111.8 mm (4.4 in) on 18 September 1986.
Across 163 earlier years (1803 to 2026) the same calendar date averaged 419 records.

Record Map

730 stations

730 station records on 18 September 1986 are marked on the map, coloured by record type. Dot size shows the significance score. Made with Natural Earth.

Weather records on 18 September 1986: highest significance records shown on the map
Station	Country	Type	Value	Significance
Chadron 3SW	United States	Record daily precipitation	111.8 mm (4.4 in)	75 of 100 (Major)
Chester	United States	Record daily precipitation	200.7 mm (7.9 in)	71 of 100 (Major)
Ottosdal	South Africa	Record daily precipitation	50.0 mm (2.0 in)	59 of 100 (Notable)
Olathe 3E	United States	Record daily precipitation	94.5 mm (3.7 in)	59 of 100 (Notable)
Sparta 1 W	United States	Record daily precipitation	67.3 mm (2.6 in)	58 of 100 (Notable)
Fullerton	United States	Record daily precipitation	62.2 mm (2.4 in)	53 of 100 (Notable)
Mandurama (Gallymont (Homeleig	Australia	Record daily precipitation	48.6 mm (1.9 in)	51 of 100 (Notable)
Mt Vernon	United States	Record daily precipitation	90.7 mm (3.6 in)	51 of 100 (Notable)
Armour	United States	Record daily precipitation	70.6 mm (2.8 in)	49 of 100 (Notable)
Sheffield	United Kingdom	Record low minimum temperature	2.2 C (36.0 F)	46 of 100 (Notable)
Du Quoin 4 SE	United States	Record daily precipitation	69.6 mm (2.7 in)	46 of 100 (Notable)
Orange (Canobolas Public Schoo	Australia	Record daily precipitation	44.6 mm (1.8 in)	45 of 100 (Notable)
Auburn	United States	Record low maximum temperature	12.2 C (54.0 F)	44 of 100 (Notable)
Vjazemskaja	Russia	Record daily precipitation	34.6 mm (1.4 in)	43 of 100 (Notable)
Buffalo 2N	United States	Record daily precipitation	86.6 mm (3.4 in)	43 of 100 (Notable)
Sedalia Wtp	United States	Record daily precipitation	119.4 mm (4.7 in)	43 of 100 (Notable)
Crater Lake Nps HQ	United States	Record daily snowfall	27.9 cm (11.0 in)	43 of 100 (Notable)
Nevada City	United States	Record low maximum temperature	12.8 C (55.0 F)	41 of 100 (Notable)
Ukiah	United States	Record low maximum temperature	17.8 C (64.0 F)	40 of 100 (Notable)
Kenton	United States	Record daily precipitation	40.9 mm (1.6 in)	40 of 100 (Notable)
Ketchikan AP	United States	Record low minimum temperature	-1.7 C (28.9 F)	40 of 100 (Notable)
Clifton City	United States	Record daily precipitation	61.2 mm (2.4 in)	39 of 100 (Notable)
Mullen 21 NW	United States	Record daily precipitation	35.8 mm (1.4 in)	39 of 100 (Notable)
Vancouver 4 NNE	United States	Record low maximum temperature	13.9 C (57.0 F)	39 of 100 (Notable)
Drobeta Turnu Severin	Romania	Record high maximum temperature	36.1 C (97.0 F)	38 of 100 (Notable)
Benton 2 N	United States	Record daily precipitation	69.9 mm (2.8 in)	38 of 100 (Notable)
Waterloo 6SW	United States	Record daily precipitation	129.0 mm (5.1 in)	38 of 100 (Notable)
Sullivan	United States	Record daily precipitation	50.8 mm (2.0 in)	38 of 100 (Notable)
Jackson McKellar- Sipes AP	United States	Record daily precipitation	46.2 mm (1.8 in)	38 of 100 (Notable)
Bigga (Woolbrook)	Australia	Record daily precipitation	37.4 mm (1.5 in)	37 of 100 (Notable)
Bikin	Russia	Record daily precipitation	35.7 mm (1.4 in)	37 of 100 (Notable)
Alexandria	United States	Record daily precipitation	37.3 mm (1.5 in)	37 of 100 (Notable)
Bonesteel	United States	Record daily precipitation	78.7 mm (3.1 in)	37 of 100 (Notable)
Ellensburg	United States	Record low maximum temperature	12.2 C (54.0 F)	37 of 100 (Notable)
Fulton 3 W	United States	Record high minimum temperature	21.7 C (71.1 F)	36 of 100 (Notable)
Toms River	United States	Record low minimum temperature	3.9 C (39.0 F)	36 of 100 (Notable)
Budapest	Hungary	Record high minimum temperature	19.4 C (66.9 F)	35 of 100 (Notable)
Bloomington Indiana UNIV	United States	Record daily precipitation	35.6 mm (1.4 in)	35 of 100 (Notable)
Gibson Dam	United States	Record daily precipitation	52.1 mm (2.1 in)	35 of 100 (Notable)
Crater Lake Nps HQ	United States	Record snow depth	35.6 cm (14.0 in)	35 of 100 (Notable)
Weston	United States	Record low minimum temperature	1.7 C (35.1 F)	35 of 100 (Notable)
Superior	United States	Record daily precipitation	26.7 mm (1.1 in)	35 of 100 (Notable)
Turgaj	Kazakhstan	Record high minimum temperature	15.2 C (59.4 F)	34 of 100 (Routine)
Vladikavkaz	Russia	Record high minimum temperature	15.2 C (59.4 F)	34 of 100 (Routine)
Carbondale Sewage Plt	United States	Record daily precipitation	71.9 mm (2.8 in)	34 of 100 (Routine)
Leavenworth	United States	Record daily precipitation	58.4 mm (2.3 in)	34 of 100 (Routine)
Nitta Yuma	United States	Record high maximum temperature	35.0 C (95.0 F)	34 of 100 (Routine)
Black Hawk	United States	Record daily precipitation	73.7 mm (2.9 in)	33 of 100 (Routine)
Lamar 7N	United States	Record daily precipitation	83.3 mm (3.3 in)	33 of 100 (Routine)
Sallisaw 2 NW	United States	Record daily precipitation	62.2 mm (2.4 in)	33 of 100 (Routine)
Menno	United States	Record daily precipitation	65.5 mm (2.6 in)	33 of 100 (Routine)
Cheyenne	United States	Record daily precipitation	35.6 mm (1.4 in)	33 of 100 (Routine)
Binalong Post Office	Australia	Record daily precipitation	27.0 mm (1.1 in)	32 of 100 (Routine)
Pte de Chassiron	France	Record low maximum temperature	14.2 C (57.6 F)	32 of 100 (Routine)
Buzau	Romania	Record high maximum temperature	36.0 C (96.8 F)	32 of 100 (Routine)
Lowell	United States	Record low minimum temperature	1.7 C (35.1 F)	32 of 100 (Routine)
California	United States	Record daily precipitation	75.7 mm (3.0 in)	32 of 100 (Routine)
Thompson Falls Ph	United States	Record daily precipitation	30.7 mm (1.2 in)	32 of 100 (Routine)
Chapel Hill 2 W	United States	Record low minimum temperature	5.6 C (42.1 F)	32 of 100 (Routine)
Burketown Post Office	Australia	Record high minimum temperature	22.8 C (73.0 F)	31 of 100 (Routine)

Counts by Type and Timescale

730 records

Records set or tied on 18 September 1986 by type: Highest daily maximum 78, Lowest daily maximum 187, Highest daily minimum 76, Lowest daily minimum 183, Heaviest daily rainfall 203, Heaviest daily snowfall 1, Deepest snow cover 2.

Records on 18 September 1986 by type
Record type	Records
Highest daily maximum	78
Lowest daily maximum	187
Highest daily minimum	76
Lowest daily minimum	183
Heaviest daily rainfall	203
Heaviest daily snowfall	1
Deepest snow cover	2

Records on 18 September 1986 by timescale: all-time 2, monthly 13, daily 715.

How Much Records Were Beaten By

559 broken records

Margins by which the 559 broken records beat the old ones, in degrees Celsius for temperature and millimetres for precipitation and snow; the largest margin was 254.0. Ties are not counted.

Top 20 by Significance

18 September 1986

Top 20 records on 18 September 1986 by significance
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 September 1986	Chadron 3SW, US	all-time rain	111.8 mm (4.4 in)	21.1 mm (0.8 in)	65 years	75 of 100 (Major)
18 September 1986	Chester, US	all-time rain	200.7 mm (7.9 in)	37.1 mm (1.5 in)	81 years	71 of 100 (Major)
18 September 1986	Ottosdal, ZA	daily rain	50.0 mm (2.0 in)	38.1 mm (1.5 in)	72 years	59 of 100 (Notable)
18 September 1986	Olathe 3E, US	daily rain	94.5 mm (3.7 in)	46.7 mm (1.8 in)	87 years	59 of 100 (Notable)
18 September 1986	Sparta 1 W, US	daily rain	67.3 mm (2.6 in)	32.0 mm (1.3 in)	84 years	58 of 100 (Notable)
18 September 1986	Fullerton, US	daily rain	62.2 mm (2.4 in)	30.4 mm (1.2 in)	80 years	53 of 100 (Notable)
18 September 1986	Mandurama (Gallymont (Homeleig, AU	daily rain	48.6 mm (1.9 in)	23.2 mm (0.9 in)	64 years	51 of 100 (Notable)
18 September 1986	Mt Vernon, US	daily rain	90.7 mm (3.6 in)	57.2 mm (2.3 in)	21 years	51 of 100 (Notable)
18 September 1986	Armour, US	daily rain	70.6 mm (2.8 in)	31.2 mm (1.2 in)	41 years	49 of 100 (Notable)
18 September 1986	Sheffield, GB	daily low min	2.2 C (36.0 F)	2.0 C (3.6 F)	96 years	46 of 100 (Notable)
18 September 1986	Du Quoin 4 SE, US	daily rain	69.6 mm (2.7 in)	18.5 mm (0.7 in)	81 years	46 of 100 (Notable)
18 September 1986	Orange (Canobolas Public Schoo, AU	daily rain	44.6 mm (1.8 in)	12.6 mm (0.5 in)	80 years	45 of 100 (Notable)
18 September 1986	Auburn, US	monthly low max	12.2 C (54.0 F)	1.1 C (2.0 F)	80 years	44 of 100 (Notable)
18 September 1986	Vjazemskaja, RU	daily rain	34.6 mm (1.4 in)	20.9 mm (0.8 in)	44 years	43 of 100 (Notable)
18 September 1986	Buffalo 2N, US	daily rain	86.6 mm (3.4 in)	62.5 mm (2.5 in)	16 years	43 of 100 (Notable)
18 September 1986	Sedalia Wtp, US	monthly rain	119.4 mm (4.7 in)	1.3 mm (0.05 in)	81 years	43 of 100 (Notable)
18 September 1986	Crater Lake Nps HQ, US	daily snowfall	27.9 cm (11.0 in)	17.7 cm (7.0 in)	27 years	43 of 100 (Notable)
18 September 1986	Nevada City, US	daily low max	12.8 C (55.0 F)	3.3 C (5.9 F)	89 years	41 of 100 (Notable)
18 September 1986	Ukiah, US	daily low max	17.8 C (64.0 F)	2.2 C (4.0 F)	90 years	40 of 100 (Notable)
18 September 1986	Kenton, US	daily rain	40.9 mm (1.6 in)	11.2 mm (0.4 in)	73 years	40 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 1986

Records set or tied on this calendar date in each year from 1803 to 1986. 1986 had 730 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 1986-09-18: 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 2026-10-18. Last revised 18 October 2026 (2026-10-18).

Margin	Records
0 to 50	554
50 to 100	3
100 to 150	0
150 to 200	1
200 to 250	0
250 to 300	1