Wyoming weather in September: Statewide normals and every place, NOAA 1991-2020
In September, Wyoming's statewide normal high is 70°F and normal low 40°F; normal highs run from 65°F in Sundance to 81°F in Yoder (NOAA 1991-2020 normals).
- Statewide normal high
- 70°FSeptember, 1991-2020
- Statewide normal low
- 40°FSeptember, 1991-2020
- Statewide normal precipitation
- 1.26 inSeptember
- Warmest place
- 81°Fnormal high, Yoder
- Coolest place
- 65°Fnormal high, Sundance
Where is Wyoming warmest and wettest in September?
Yoder has the warmest September afternoons (81°F) and Sundance the coolest (65°F). Story gets the most precipitation (2.26 in) and Deaver the least (0.59 in). The most snow falls in Story (2.2 inches).
Statewide, September averaged 58.1°F in 2021, 59.7°F in 2022, 57.4°F in 2023, 60.0°F in 2024, 58.2°F in 2025, against a 1991-2020 normal of 55.4°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Cheyenne | 73°F | 46°F | 1.47 | 1.0 |
| Casper | 76°F | 42°F | 0.95 | 1.5 |
| Gillette | 75°F | 44°F | 0.98 | – |
| Laramie | 70°F | 39°F | 1.11 | – |
| Rock Springs | 71°F | 44°F | 0.79 | 1.2 |
| Sheridan | 76°F | 43°F | 1.47 | – |
| Evanston | 70°F | 43°F | 1.01 | – |
| Green River | 76°F | 41°F | 0.87 | 0.3 |
| Riverton | 74°F | 44°F | 0.77 | – |
| Jackson | 68°F | 33°F | 1.59 | 0.1 |
| Cody | 72°F | 47°F | 1.15 | 0.4 |
| Rawlins | 72°F | 41°F | 0.89 | – |
| Lander | 75°F | 45°F | 0.98 | 1.5 |
| Powell | 73°F | 41°F | 0.76 | 0.0 |
| Douglas | 77°F | 43°F | 0.97 | – |
| Torrington | 79°F | 45°F | 1.10 | – |
| Worland | 76°F | 42°F | 0.93 | – |
| Buffalo | 72°F | 47°F | 1.17 | – |
| Wheatland | 80°F | 43°F | 1.29 | 0.1 |
| Newcastle | 75°F | 49°F | 1.20 | 0.2 |
| Thermopolis | 80°F | 46°F | 1.21 | 0.3 |
| Kemmerer | 72°F | 32°F | 0.97 | 0.4 |
| Lovell | 74°F | 43°F | 0.79 | 0.1 |
| Afton | 69°F | 34°F | 1.52 | 0.2 |
| Pinedale | 69°F | 33°F | 1.21 | 0.6 |
| Saratoga | 72°F | 41°F | – | – |
| Greybull | 77°F | 45°F | 0.83 | – |
| Lusk | 74°F | 42°F | – | – |
| Basin | 79°F | 48°F | 0.95 | 0.2 |
| Mountain View | 70°F | 37°F | 1.28 | 1.0 |
| Story | 70°F | 42°F | 2.26 | 2.2 |
| Sundance | 65°F | 44°F | 1.71 | – |
| Pine Bluffs | 77°F | 45°F | 1.39 | – |
| Guernsey | 78°F | 48°F | 1.20 | – |
| Moorcroft | 74°F | 44°F | – | – |
| Dubois | 69°F | 35°F | 1.30 | 0.8 |
| Upton | 75°F | 44°F | 1.20 | 0.1 |
| Dayton | 73°F | 40°F | 1.55 | 0.3 |
| Alta | 69°F | 40°F | 1.85 | 0.5 |
| Shoshoni | 77°F | 46°F | 0.86 | 0.1 |
| Bedford | 70°F | 34°F | 1.70 | – |
| Baggs | 75°F | 40°F | 1.09 | 0.2 |
| Lingle | 78°F | 43°F | 1.27 | – |
| La Barge | 72°F | 34°F | 0.96 | 1.2 |
| Big Piney | 70°F | 32°F | 0.64 | – |
| Centennial | 68°F | 39°F | – | – |
| Hulett | 75°F | 43°F | 1.18 | 0.1 |
| Midwest | 76°F | 41°F | 0.88 | 0.3 |
| Kaycee | 76°F | 42°F | 1.03 | 0.3 |
| Glendo | 77°F | 47°F | 1.15 | – |
| Medicine Bow | 74°F | 36°F | 0.96 | 1.2 |
| Pavillion | 74°F | 44°F | 0.87 | 0.3 |
| Wamsutter | 73°F | 39°F | 0.90 | 0.7 |
| Farson | 71°F | 33°F | 0.85 | 0.1 |
| Deaver | 77°F | 44°F | 0.59 | 0.0 |
| Chugwater | 77°F | 44°F | 1.30 | 1.0 |
| Albin | 77°F | 47°F | 1.96 | 1.6 |
| Daniel | 67°F | 26°F | 1.31 | 0.3 |
| Elk Mountain | 71°F | 40°F | 1.10 | 0.4 |
| Yoder | 81°F | 45°F | 1.32 | 0.8 |
| Clearmont | 74°F | 41°F | – | – |
| Bondurant | 71°F | 33°F | 1.44 | 0.2 |
| Cora | 68°F | 30°F | – | – |
| Shell | 76°F | 42°F | 1.07 | 0.0 |
| Atlantic City | 67°F | 33°F | 1.31 | – |
| Fontenelle | 71°F | 34°F | 0.85 | 0.0 |
| Big Horn | 74°F | 45°F | 1.70 | 1.0 |
| Archer | 77°F | 42°F | 1.57 | 1.2 |
| Bates Creek #2 | 72°F | 43°F | 1.05 | 0.6 |
| Billy Creek | 74°F | 43°F | 1.29 | 0.2 |
| Bitter Creek (4 mi NE) | 73°F | 41°F | 0.74 | – |
| Black Mountain | 72°F | 49°F | 1.34 | 1.0 |
| Boulder | 71°F | 30°F | 1.00 | 0.3 |
| Boysen Dam | 77°F | 47°F | 0.96 | 0.1 |
| Buckboard Marina | 75°F | 40°F | 0.85 | 0.0 |
| Buffalo Bill Dam | 71°F | 47°F | 1.25 | 0.0 |
| Burgess Junction | 61°F | 33°F | 2.02 | – |
| Burris | 71°F | 38°F | 1.00 | 0.4 |
| Carpenter | 77°F | 43°F | 1.87 | 0.4 |
| Church Buttes Gas Plant | 71°F | 44°F | 1.09 | 0.3 |
| Clark (3 mi NE) | 73°F | 42°F | 0.78 | 0.0 |
| Colony | 74°F | 48°F | 1.12 | 0.0 |
| Darwin Ranch | 62°F | 28°F | 1.88 | 1.9 |
| Devils Tower #2 | 75°F | 42°F | 1.32 | 0.0 |
| Dillinger | 76°F | 42°F | 0.96 | 0.0 |
| Diversion Dam | 73°F | 41°F | 0.97 | 0.5 |
| Double Four Ranch | 74°F | 38°F | 1.48 | 1.8 |
| Dull Center (1 mi SE) | 78°F | 45°F | 0.99 | 0.8 |
| Echeta (2 mi NW) | 77°F | 43°F | – | – |
| Emblem | 74°F | 44°F | 1.00 | 0.0 |
| Fossil Butte | 72°F | 32°F | 1.10 | – |
| Heart Mountain | 73°F | 44°F | 0.88 | 0.7 |
| Hecla (1 mi E) | 72°F | 42°F | 1.50 | 1.0 |
| Jeffrey City | 73°F | 39°F | 0.82 | 1.3 |
| La Grange | 79°F | 46°F | 1.46 | 0.3 |
| Lake Yellowstone | 61°F | 34°F | 1.58 | 1.4 |
| Lamar Ranger Station | 71°F | 33°F | 1.47 | – |
| Lance Creek (11 mi NNE) | 77°F | 44°F | 1.38 | 0.0 |
| Leiter (9 mi N) | 77°F | 46°F | 1.28 | 0.4 |
| Leo (6 mi SW) | 76°F | 42°F | 0.84 | 1.1 |
| Moose | 71°F | 34°F | 1.57 | 0.3 |
| Moran (5 mi WNW) | 66°F | 34°F | 1.64 | 0.4 |
| Muddy Gap | 74°F | 45°F | – | – |
| Old Faithful | 65°F | 30°F | 1.70 | 0.9 |
| Old Fort Laramie | 80°F | 44°F | 1.39 | 0.0 |
| Pahaska | 69°F | 32°F | 1.92 | 1.8 |
| Pathfinder Dam | 73°F | 48°F | 0.83 | – |
| Phillips | 77°F | 43°F | 1.42 | 0.2 |
| Powder River | 75°F | 42°F | – | – |
| Powder River (School) | 75°F | 41°F | 1.11 | – |
| Redbird | 79°F | 45°F | 1.17 | 0.4 |
| Rochelle (7 mi ENE) | 77°F | 39°F | 0.76 | – |
| Sage (4 mi NNW) | 74°F | 31°F | – | – |
| Seminoe Reservoir USBR | 70°F | 45°F | 1.00 | – |
| Shirley Basin | 69°F | 34°F | 0.93 | – |
| Snake River | 66°F | 28°F | 1.87 | 0.2 |
| South Pass City | 67°F | 31°F | – | – |
| Sunshine (3 mi NE) | 66°F | 35°F | 1.32 | 1.6 |
| Sybille Research Unit | 72°F | 44°F | 1.31 | 0.7 |
| Tensleep (16 mi SSE) | 73°F | 38°F | 1.25 | 0.3 |
| Tensleep (4 mi NE) | 76°F | 46°F | 1.47 | 0.3 |
| Thermopolis (21 mi WNW) | 75°F | 41°F | – | – |
| Torrington (29 mi N) | 76°F | 45°F | 1.21 | 1.1 |
| Tower Falls | 69°F | 32°F | 1.33 | 0.4 |
| Wapiti (1 mi WSW) | 71°F | 42°F | 1.11 | 0.2 |
| Weston (1 mi E) | 76°F | 42°F | 1.05 | 0.4 |
| Whalen Dam USBR | 78°F | 46°F | 1.21 | – |
| Wright (12 mi W) | 74°F | 43°F | 1.01 | 0.9 |
| Yellowstone Lake | 61°F | 30°F | 1.57 | – |
| Yellowstone National Park E Ent | 67°F | 31°F | 1.94 | – |
| Yellowstone Park Mammoth | 69°F | 39°F | 1.21 | 0.6 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.