The official National Weather Service forecast for Green River — 41.5286°N, 109.4663°W, population 11,873, 1.1 miles from I-80.
| Sweetwater County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 31 | 34 | 44 | 53 | 64 | 76 | 85 | 82 | 72 | 57 | 42 | 32 | 56 |
| Avg low °F | 10 | 12 | 21 | 27 | 35 | 44 | 52 | 49 | 40 | 30 | 19 | 11 | 29 |
| Precip in | 0.5 | 0.5 | 0.7 | 1.0 | 1.3 | 0.8 | 0.6 | 0.8 | 1.0 | 0.9 | 0.5 | 0.5 | 9.1 |
1996–2025 normals for Sweetwater County — the climate division Green River sits in. All-time county record high 97.8°F (2002-07-14); record low -34.1°F (1990-12-22). Source: NOAA / National Weather Service.