Montana weather in September: Statewide normals and every place, NOAA 1991-2020
In September, Montana's statewide normal high is 70°F and normal low 42°F; normal highs run from 62°F in Cooke City to 79°F in Hardin (NOAA 1991-2020 normals).
- Statewide normal high
- 70°FSeptember, 1991-2020
- Statewide normal low
- 42°FSeptember, 1991-2020
- Statewide normal precipitation
- 1.39 inSeptember
- Warmest place
- 79°Fnormal high, Hardin
- Coolest place
- 62°Fnormal high, Cooke City
Where is Montana warmest and wettest in September?
Hardin has the warmest September afternoons (79°F) and Cooke City the coolest (62°F). Hungry Horse gets the most precipitation (2.21 in) and Glen the least (0.71 in). The most snow falls in Red Lodge (2.1 inches).
Statewide, September averaged 58.3°F in 2021, 60.6°F in 2022, 58.5°F in 2023, 61.1°F in 2024, 61.1°F in 2025, against a 1991-2020 normal of 55.7°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Billings | 74°F | 49°F | 1.36 | 0.3 |
| Missoula | 73°F | 42°F | 0.96 | 0.1 |
| Great Falls | 72°F | 43°F | 1.33 | 0.8 |
| Bozeman | 73°F | 40°F | 1.00 | – |
| Butte | 69°F | 37°F | 1.07 | – |
| Helena | 73°F | 45°F | 0.96 | 0.2 |
| Kalispell | 70°F | 38°F | 1.17 | 0.0 |
| Anaconda | 72°F | 40°F | 1.15 | 0.4 |
| Whitefish | 69°F | 40°F | 1.25 | 0.0 |
| Havre | 73°F | 43°F | 1.06 | 0.4 |
| Livingston | 74°F | 41°F | 1.20 | – |
| Miles City | 76°F | 47°F | 1.07 | – |
| Lewistown | 70°F | 42°F | 1.39 | – |
| Sidney | 76°F | 46°F | 1.62 | 0.0 |
| Polson | 71°F | 46°F | 1.19 | – |
| Hamilton | 72°F | 40°F | 0.81 | – |
| Glendive | 76°F | 48°F | 1.43 | 0.0 |
| Dillon | 70°F | 39°F | 0.91 | – |
| Hardin | 79°F | 44°F | 1.36 | 0.0 |
| Shelby | 71°F | 41°F | 1.01 | 0.5 |
| Libby | 72°F | 40°F | – | – |
| Glasgow | 73°F | 47°F | 1.06 | 0.0 |
| Deer Lodge | 70°F | 35°F | 1.35 | – |
| Cut Bank | 69°F | 40°F | 1.08 | – |
| Red Lodge | 71°F | 42°F | 1.63 | 2.1 |
| Wolf Point | 75°F | 43°F | 1.01 | – |
| Conrad | 71°F | 42°F | 1.07 | 0.7 |
| Big Sky | 68°F | 33°F | 1.70 | – |
| Stevensville | 74°F | 40°F | 0.84 | 0.0 |
| Townsend | 73°F | 42°F | 0.78 | 0.0 |
| Colstrip | 73°F | 46°F | 1.43 | 0.2 |
| Roundup | 77°F | 42°F | 1.20 | 0.0 |
| Columbus | 74°F | 39°F | 1.36 | 0.2 |
| Malta | 74°F | 46°F | 1.41 | – |
| Choteau | 72°F | 40°F | 1.16 | 0.9 |
| Baker | 73°F | 44°F | 1.53 | – |
| Big Timber | 74°F | 43°F | 1.31 | 0.5 |
| Forsyth | 75°F | 46°F | 1.38 | 0.1 |
| Plentywood | 72°F | 40°F | 1.26 | – |
| Eureka | 75°F | 44°F | 1.27 | 0.0 |
| Thompson Falls | 75°F | 44°F | 0.97 | 0.0 |
| Fort Benton | 74°F | 42°F | 1.20 | 0.3 |
| Seeley Lake | 73°F | 37°F | 1.19 | 0.0 |
| Boulder | 72°F | 38°F | 1.10 | – |
| West Yellowstone | 68°F | 30°F | 1.69 | – |
| Chinook | 72°F | 41°F | 0.99 | – |
| Ennis | 72°F | 37°F | 0.97 | 0.1 |
| White Sulphur Springs | 71°F | 39°F | 1.04 | – |
| Scobey | 73°F | 39°F | 1.15 | 0.0 |
| Harlowton | 73°F | 40°F | 1.07 | 0.1 |
| Superior | 77°F | 42°F | 0.99 | – |
| Troy | 75°F | 42°F | 1.21 | – |
| Darby | 71°F | 42°F | 1.23 | – |
| Lincoln | 70°F | 35°F | 1.33 | – |
| Chester | 71°F | 41°F | 1.00 | 0.6 |
| St. Ignatius | 75°F | 44°F | 1.51 | – |
| Fairfield | 69°F | 44°F | 1.23 | – |
| Gardiner | 76°F | 44°F | 1.24 | – |
| Harlem | 74°F | 42°F | 1.09 | – |
| Bridger | 75°F | 42°F | 1.15 | 0.0 |
| Culbertson | 76°F | 44°F | 1.33 | – |
| Hungry Horse | 69°F | 44°F | 2.21 | – |
| Joliet | 74°F | 39°F | 1.26 | 0.4 |
| Big Sandy | 74°F | 44°F | 1.16 | – |
| Circle | 76°F | 45°F | 1.33 | – |
| Cascade | 74°F | 44°F | 1.63 | 0.3 |
| Terry | 76°F | 45°F | 1.17 | 0.0 |
| Alberton | 76°F | 40°F | 1.07 | 0.1 |
| Valier | 72°F | 43°F | 1.25 | – |
| Huntley | 75°F | 43°F | 1.35 | 0.2 |
| Busby | 77°F | 41°F | 1.58 | 0.2 |
| Broadus | 79°F | 46°F | 1.23 | – |
| Wibaux | 73°F | 42°F | 1.78 | 0.1 |
| Stanford | 71°F | 44°F | 1.50 | – |
| Ekalaka | 75°F | 46°F | 1.60 | 0.1 |
| Twin Bridges | 74°F | 37°F | 0.88 | – |
| Fortine | 72°F | 40°F | 1.23 | 0.0 |
| Jordan | 75°F | 42°F | 1.17 | – |
| Sunburst | 70°F | 44°F | 1.17 | – |
| St. Regis | 76°F | 39°F | – | – |
| Trout Creek | 74°F | 41°F | 1.32 | 0.0 |
| St. Marie | 73°F | 46°F | 0.99 | – |
| Heron | 71°F | 40°F | 1.62 | 0.0 |
| Yaak | 70°F | 35°F | 1.31 | – |
| Drummond | 74°F | 37°F | 0.90 | 0.1 |
| Nashua | 76°F | 45°F | – | – |
| Joplin | 71°F | 41°F | 1.06 | 0.0 |
| Hysham | 75°F | 46°F | 1.40 | 0.1 |
| Wyola | 78°F | 40°F | 1.41 | – |
| Virginia City | 71°F | 41°F | 1.19 | 0.2 |
| Hinsdale | 72°F | 45°F | 1.51 | – |
| Savage | 77°F | 45°F | 1.46 | 0.0 |
| Medicine Lake | 72°F | 42°F | 1.17 | – |
| Fort Peck | 77°F | 48°F | 1.05 | – |
| Ryegate | 76°F | 42°F | – | – |
| Swan Lake | 70°F | 39°F | – | – |
| Augusta | 73°F | 42°F | 1.38 | – |
| Wilsall | 70°F | 35°F | 1.32 | – |
| Lima | 71°F | 39°F | 0.92 | 0.6 |
| Denton | 72°F | 39°F | 1.31 | – |
| Highwood | 73°F | 46°F | 1.47 | – |
| St. Mary | 63°F | 39°F | 1.63 | – |
| West Glacier | 68°F | 41°F | 1.96 | 0.0 |
| Elliston | 69°F | 36°F | 1.40 | – |
| Geraldine | 75°F | 45°F | 1.49 | – |
| Winifred | 72°F | 43°F | 1.20 | – |
| Plevna | 75°F | 44°F | 1.48 | 0.1 |
| Westby | 70°F | 41°F | 1.26 | – |
| Saco | 72°F | 42°F | 1.35 | – |
| Melstone | 76°F | 46°F | 1.18 | 0.1 |
| Logan | 73°F | 39°F | 1.38 | – |
| Roy | 76°F | 43°F | 0.94 | 0.0 |
| Gildford | 71°F | 40°F | 1.08 | – |
| Olney | 69°F | 33°F | 1.23 | – |
| Wisdom | 68°F | 28°F | 1.09 | – |
| Grass Range | 73°F | 44°F | 1.46 | 0.1 |
| Judith Gap | 69°F | 40°F | 1.36 | 0.2 |
| Rapelje | 73°F | 43°F | 1.40 | 0.2 |
| Cooke City | 62°F | 31°F | 1.74 | 1.0 |
| Silver Gate | 64°F | 30°F | – | – |
| Loma | 76°F | 41°F | 1.12 | 0.0 |
| Zortman | 68°F | 43°F | 1.37 | – |
| Glen | 76°F | 33°F | 0.71 | 0.0 |
| Vida | 74°F | 44°F | 1.28 | – |
| Nye | 73°F | 40°F | 1.44 | 0.2 |
| Polebridge | 70°F | 32°F | – | – |
| Ovando | 69°F | 33°F | 1.03 | – |
| Neihart | 72°F | 40°F | – | – |
| Raynesford | 72°F | 43°F | 2.09 | – |
| Lakeview | 67°F | 35°F | 1.53 | – |
| Martinsdale | 72°F | 38°F | 0.97 | 0.5 |
| Biddle | 78°F | 46°F | 1.29 | 0.1 |
| Sula | 73°F | 34°F | 1.25 | – |
| Haugan | 72°F | 35°F | 1.76 | – |
| Jackson | 66°F | 32°F | 1.10 | – |
| Moccasin | 71°F | 41°F | 1.48 | 0.2 |
| Redstone | 72°F | 38°F | 0.97 | – |
| Norris | 75°F | 49°F | 1.44 | 0.0 |
| Bynum | 70°F | 43°F | 1.19 | – |
| Potomac | 71°F | 32°F | 0.91 | 0.2 |
| Brockway | 73°F | 44°F | 1.08 | – |
| Adel | 68°F | 39°F | – | – |
| Albion (1 mi N) | 73°F | 37°F | 1.09 | 0.0 |
| Alder (17 mi S) | 69°F | 39°F | 1.23 | 0.2 |
| Alder (19 mi S) | 70°F | 37°F | 1.27 | – |
| Austin (1 mi W) | 67°F | 39°F | 1.28 | – |
| Bigfork (13 mi S) | 69°F | 47°F | 1.73 | – |
| Blackleaf | 70°F | 37°F | – | – |
| Brady 27 ENE (The Knees) | 72°F | 45°F | 1.14 | 0.1 |
| Brandenberg | 77°F | 44°F | 1.21 | 0.0 |
| Bredette | 72°F | 43°F | 1.02 | 0.0 |
| Carlyle (13 mi NW) | 71°F | 46°F | 1.69 | 0.1 |
| Carter (14 mi W) | 72°F | 43°F | 1.18 | 0.0 |
| Chinook (35 mi SE) | 69°F | 42°F | 1.03 | – |
| Cohagen | 74°F | 42°F | 1.12 | 0.0 |
| Content (4 mi NNE) | 73°F | 41°F | 1.21 | – |
| Creston | 70°F | 41°F | 1.32 | 0.0 |
| Del Bonita | 67°F | 40°F | 1.46 | – |
| Divide | 70°F | 37°F | 1.13 | 0.1 |
| Dunkirk (19 mi NNE) | 70°F | 39°F | 1.05 | – |
| East Glacier | 63°F | 38°F | 2.17 | – |
| Flatwillow (4 mi ENE) | 75°F | 45°F | 1.17 | 0.0 |
| Fort Assiniboine | 73°F | 43°F | 1.18 | 0.0 |
| Fort Belknap (2 mi SW) | 72°F | 42°F | 0.96 | – |
| Gibson (2 mi NE) | 74°F | 40°F | 1.29 | 1.0 |
| Gibson Dam | 68°F | 36°F | 1.31 | – |
| Goldbutte (7 mi N) | 70°F | 39°F | 1.41 | 1.4 |
| Great Falls 16ST | 73°F | 45°F | 1.39 | – |
| Hebgen Dam | 68°F | 37°F | 1.59 | 0.0 |
| Holter Dam | 74°F | 44°F | 1.30 | 0.0 |
| Hysham (25 mi SSE) | 76°F | 41°F | 1.38 | 0.1 |
| Ingomar (9 mi E) | 76°F | 42°F | 1.10 | 0.0 |
| Laurin (2 mi NE) | 69°F | 42°F | 1.21 | – |
| Lennep (5 mi SW) | 66°F | 35°F | 1.33 | 0.9 |
| Lewistown (42 mi WSW) | 69°F | 36°F | 1.34 | – |
| Libby (32 mi SSE) | 67°F | 34°F | 1.19 | 0.0 |
| Libby Dam (Base) | 74°F | 42°F | 1.12 | – |
| Lindbergh Lake | 67°F | 41°F | 1.38 | 0.0 |
| Malta (35 mi S) | 74°F | 43°F | 1.09 | 0.0 |
| Melville (4 mi W) | 66°F | 39°F | 1.66 | – |
| Mildred (5 mi N) | 76°F | 43°F | 1.35 | – |
| Millegan (14 mi SE) | 69°F | 37°F | 1.36 | 0.9 |
| Mizpah (4 mi NNW) | 79°F | 43°F | 1.26 | 0.1 |
| Moorhead (9 mi NE) | 77°F | 43°F | 1.05 | 0.0 |
| Mosby (4 mi ENE) | 76°F | 48°F | 1.23 | – |
| Mystic Lake | 66°F | 42°F | 2.03 | 3.8 |
| Opheim (10 mi N) | 70°F | 39°F | 1.39 | 0.2 |
| Opheim (12 mi SSE) | 66°F | 36°F | 1.10 | 0.2 |
| Phillipsburg Ranger Station | 71°F | 36°F | 1.44 | – |
| Pompeys Pillar (15 mi N) | 73°F | 42°F | 1.20 | 0.2 |
| Port Of Morgan | 72°F | 43°F | 1.28 | 0.3 |
| Powderville (8 mi NNE) | 78°F | 46°F | 1.25 | 0.0 |
| Raymond Border Station | 71°F | 43°F | 1.07 | 0.0 |
| Ridgeway (1 mi S) | 74°F | 45°F | 1.27 | 0.0 |
| Rock Springs | 74°F | 45°F | 1.19 | – |
| Rogers Pass (9 mi NNE) | 70°F | 41°F | 1.65 | – |
| Rudyard (19 mi S) | 70°F | 40°F | 1.11 | – |
| Rudyard (21 mi N) | 71°F | 39°F | 1.12 | – |
| SKQ Dam | 71°F | 43°F | 1.14 | 0.0 |
| Sand Creek | 74°F | 45°F | – | – |
| Shonkin (7 mi S) | 68°F | 44°F | 2.29 | – |
| Simpson 6 N - Wildhorse | 72°F | 40°F | 1.15 | 0.0 |
| Sonnette (7 mi SW) | 75°F | 42°F | 1.09 | 0.0 |
| Sun River (4 mi S) | 72°F | 40°F | 1.27 | – |
| Sweetgrass | 72°F | 42°F | – | – |
| Tiber Dam | 74°F | 43°F | 0.91 | – |
| Tizer Gardens | 71°F | 35°F | 1.42 | – |
| Trident | 73°F | 43°F | 1.10 | – |
| Turner (11 mi N) | 73°F | 42°F | 1.17 | 0.0 |
| Valentine | 74°F | 42°F | 1.16 | 0.0 |
| Western Agricultural Research Center | 73°F | 41°F | 0.93 | – |
| Wise River (3 mi WNW) | 70°F | 30°F | 1.21 | – |
| Wolf Point (29 mi ENE) | 73°F | 40°F | 1.07 | – |
| Wolf Point (34 mi NE) | 69°F | 47°F | 0.84 | – |
| Yellowtail Dam | 76°F | 49°F | 1.67 | 0.0 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.