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Topics / Climate / United States / Montana

Was September normal in Montana?

September 2026 · 56 counties · data family: climatedata.dev

Warmer than normal

57.3°FStatewide average temperature, September 2026

+1.6°F against the 1991–2020 normal of 55.7°F
23rd warmest September of 132 since 1895
Of 56 counties: 5 much warmer, 43 warmer, 8 near normal
Furthest above normal: Carter County (+4.7°F); furthest below: Ravalli County (-1.3°F)
Precipitation 2.18 in, 157% of normal: wetter than normal

Every Montana county, September 2026September 2026 by county: 5 much warmer, 43 warmer, 8 near normal; furthest above normal Carter County (+4.7°F), furthest below Ravalli County (-1.3°F).Choose a county to see its answer. The colour shows how far each county was from its own 1991–2020 normal.

+4°F or more 4
+3 to +4°F 8
+2 to +3°F 9
+1 to +2°F 15
within 1°F 15
−1 to −2°F 5

Much warmer than normal 5
Warmer than normal 43
Near normal 8
Cooler than normal 0
Much cooler than normal 0

Every September since 1895, Montana statewideSeptember 2026 averaged 57.3°F, +1.6°F against the 1991–2020 normal: the 23rd warmest September of 132 since 1895.

Show the numbers (132 rows)

Year	September average
2026	57.3°F
2025	61.1°F
2024	61.1°F
2023	58.5°F
2022	60.6°F
2021	58.3°F
2020	57.0°F
2019	55.0°F
2018	53.0°F
2017	55.2°F
2016	54.8°F
2015	57.3°F
2014	55.1°F
2013	58.8°F
2012	58.2°F
2011	58.3°F
2010	54.1°F
2009	60.7°F
2008	53.6°F
2007	55.0°F
2006	54.8°F
2005	55.4°F
2004	54.1°F
2003	54.6°F
2002	55.7°F
2001	58.7°F
2000	54.4°F
1999	51.6°F
1998	61.4°F
1997	58.1°F
1996	52.6°F
1995	54.5°F
1994	58.6°F
1993	51.6°F
1992	53.4°F
1991	55.6°F
1990	60.3°F
1989	54.3°F
1988	53.8°F
1987	56.5°F
1986	48.9°F
1985	47.8°F
1984	49.1°F
1983	52.1°F
1982	52.7°F
1981	56.5°F
1980	54.7°F
1979	58.5°F
1978	55.4°F
1977	53.1°F
1976	56.7°F
1975	53.2°F
1974	52.2°F
1973	53.0°F
1972	50.3°F
1971	51.1°F
1970	51.0°F
1969	56.9°F
1968	53.8°F
1967	59.2°F
1966	58.8°F
1965	43.6°F
1964	50.7°F
1963	60.0°F
1962	53.2°F
1961	48.1°F
1960	55.5°F
1959	52.0°F
1958	54.8°F
1957	54.2°F
1956	54.8°F
1955	52.9°F
1954	53.4°F
1953	56.4°F
1952	57.5°F
1951	50.1°F
1950	52.7°F
1949	53.8°F
1948	56.7°F
1947	53.6°F
1946	53.0°F
1945	51.3°F
1944	54.8°F
1943	54.7°F
1942	53.9°F
1941	49.6°F
1940	59.6°F
1939	55.9°F
1938	60.8°F
1937	56.6°F
1936	55.5°F
1935	56.1°F
1934	49.7°F
1933	54.2°F
1932	54.0°F
1931	55.6°F
1930	54.7°F
1929	49.4°F
1928	53.2°F
1927	52.4°F
1926	46.7°F
1925	53.2°F
1924	53.7°F
1923	55.7°F
1922	57.9°F
1921	49.9°F
1920	55.0°F
1919	55.1°F
1918	53.5°F
1917	55.2°F
1916	52.6°F
1915	49.9°F
1914	54.2°F
1913	54.8°F
1912	47.0°F
1911	51.7°F
1910	52.4°F
1909	56.0°F
1908	56.1°F
1907	52.2°F
1906	56.8°F
1905	56.8°F
1904	54.3°F
1903	50.8°F
1902	51.3°F
1901	48.7°F
1900	52.0°F
1899	56.0°F
1898	53.5°F
1897	56.9°F
1896	49.4°F
1895	50.7°F

All 56 counties, September 2026

Record rank: 1 is the warmest September on record for that county.


1	Carter	63.2°F	+4.7°F	5 of 132	Much warmer than normal
2	Fallon	63.0°F	+4.5°F	9 of 132	Much warmer than normal
3	Wibaux	62.8°F	+4.3°F	12 of 132	Much warmer than normal
4	Powder River	63.6°F	+4.0°F	10 of 132	Much warmer than normal
5	Custer	63.8°F	+3.9°F	14 of 132	Warmer than normal
6	Prairie	63.0°F	+3.9°F	14 of 132	Warmer than normal
7	Dawson	62.2°F	+3.7°F	15 of 132	Warmer than normal
8	Sheridan	60.1°F	+3.7°F	16 of 132	Warmer than normal
9	McCone	61.9°F	+3.6°F	14 of 132	Warmer than normal
10	Roosevelt	61.1°F	+3.6°F	15 of 132	Warmer than normal
11	Richland	61.8°F	+3.5°F	15 of 132	Warmer than normal
12	Daniels	58.4°F	+3.1°F	15 of 132	Warmer than normal
13	Big Horn	61.4°F	+2.9°F	15 of 132	Warmer than normal
14	Carbon	58.4°F	+2.9°F	13 of 132	Much warmer than normal
15	Rosebud	62.0°F	+2.9°F	17 of 132	Warmer than normal
16	Treasure	61.8°F	+2.4°F	16 of 132	Warmer than normal
17	Yellowstone	62.0°F	+2.4°F	18 of 132	Warmer than normal
18	Stillwater	58.5°F	+2.3°F	18 of 132	Warmer than normal
19	Valley	59.3°F	+2.3°F	24 of 132	Warmer than normal
20	Garfield	60.9°F	+2.2°F	24 of 132	Warmer than normal
21	Musselshell	60.9°F	+2.0°F	22 of 132	Warmer than normal
22	Phillips	60.0°F	+1.9°F	25 of 132	Warmer than normal
23	Chouteau	59.0°F	+1.7°F	23 of 132	Warmer than normal
24	Liberty	57.4°F	+1.7°F	23 of 132	Warmer than normal
25	Petroleum	61.4°F	+1.7°F	28 of 132	Warmer than normal
26	Fergus	58.6°F	+1.6°F	28 of 132	Warmer than normal
27	Hill	57.6°F	+1.6°F	25 of 132	Warmer than normal
28	Sweet Grass	56.6°F	+1.6°F	24 of 132	Warmer than normal
29	Blaine	58.0°F	+1.5°F	30 of 132	Warmer than normal
30	Park	53.0°F	+1.5°F	23 of 132	Warmer than normal
31	Cascade	57.2°F	+1.3°F	27 of 132	Warmer than normal
32	Golden Valley	58.4°F	+1.2°F	32 of 132	Warmer than normal
33	Toole	56.7°F	+1.2°F	25 of 132	Warmer than normal
34	Judith Basin	55.2°F	+1.1°F	34 of 132	Warmer than normal
35	Gallatin	53.5°F	+1.0°F	30 of 132	Warmer than normal
36	Meagher	53.0°F	+1.0°F	30 of 132	Warmer than normal
37	Lewis and Clark	53.6°F	+0.7°F	30 of 132	Warmer than normal
38	Pondera	55.2°F	+0.7°F	27 of 132	Warmer than normal
39	Teton	54.6°F	+0.7°F	29 of 132	Warmer than normal
40	Wheatland	55.9°F	+0.7°F	36 of 132	Warmer than normal
41	Broadwater	56.0°F	+0.6°F	32 of 132	Warmer than normal
42	Silver Bow	52.0°F	+0.3°F	37 of 132	Warmer than normal
43	Glacier	51.9°F	+0.1°F	32 of 132	Warmer than normal
44	Madison	52.1°F	+0.0°F	42 of 132	Warmer than normal
45	Jefferson	52.9°F	−0.1°F	41 of 132	Warmer than normal
46	Beaverhead	50.5°F	−0.3°F	43 of 132	Warmer than normal
47	Deer Lodge	49.7°F	−0.3°F	47 of 132	Near normal
48	Flathead	51.3°F	−0.3°F	38 of 132	Warmer than normal
49	Powell	51.2°F	−0.3°F	41 of 132	Warmer than normal
50	Granite	50.1°F	−0.7°F	57 of 132	Near normal
51	Lake	54.8°F	−0.7°F	51 of 132	Near normal
52	Mineral	52.9°F	−1.0°F	62 of 132	Near normal
53	Missoula	52.2°F	−1.1°F	61 of 132	Near normal
54	Sanders	53.9°F	−1.1°F	59 of 132	Near normal
55	Lincoln	52.1°F	−1.3°F	59 of 132	Near normal
56	Ravalli	50.7°F	−1.3°F	71 of 132	Near normal

Get this data

This page's numbers, as JSON:

curl https://visualizedata.org/data/topics/climate/us-mt.json

The climatedata.dev API it comes from (live, no key; every month since 1895 with its normal, anomaly and rank):

curl "https://api.climatedata.dev/v1/us-climate/tavg/us-mt.json"

Open the JSON

What this can't tell you

A statewide average is not the average of its counties: NOAA computes it from its own grid, weighted by area.
The most recent months are preliminary and NOAA revises them in the next release.

How the answer is decided

Each month is ranked against the same month in every year on record (since 1895 for most places). The top tenth of the record is 'much warmer than normal', the top third 'warmer', the middle third 'near normal'. Counties are coloured by the same five words.

Sources

climatedata.dev us-climate, version 2026-10-25.6c7474e6d8 (U.S. public domain)
NOAA Monthly U.S. Climate Divisional Database (nClimDiv), statewide and national files (U.S. public domain)
climatedata.dev county-climate, version 2026-10-25.b4bbb5298a (U.S. public domain)
U.S. Census Bureau TIGERweb, counties (generalised) (U.S. public domain)
Built 2026-10-26. Download every county's answer (JSON)

Every topic for one county: How's Hennepin County?