The official National Weather Service forecast for Sidney — 40.7483°N, 95.6475°W, 8.8 miles from I-29.
| Fremont County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 39 | 52 | 64 | 74 | 84 | 87 | 85 | 79 | 66 | 52 | 38 | 63 |
| Avg low °F | 15 | 18 | 30 | 40 | 51 | 62 | 66 | 64 | 55 | 43 | 30 | 20 | 41 |
| Precip in | 0.8 | 1.1 | 1.9 | 3.2 | 5.2 | 4.8 | 3.6 | 3.7 | 2.9 | 2.8 | 1.5 | 1.1 | 32.6 |
1996–2025 normals for Fremont County — the climate division Sidney sits in. All-time county record high 105.9°F (1974-07-22); record low -25.7°F (1974-01-12). Source: NOAA / National Weather Service.