The official National Weather Service forecast for Fairfield — 38.2494°N, 122.04°W, population 150,122, 1.6 miles from I-80. Forecasts here are written by NWS STO, this county’s forecast office.
| Solano County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 57 | 62 | 66 | 72 | 79 | 86 | 90 | 90 | 87 | 78 | 65 | 57 | 74 |
| Avg low °F | 40 | 42 | 44 | 47 | 52 | 56 | 58 | 58 | 56 | 51 | 44 | 40 | 49 |
| Precip in | 4.0 | 3.9 | 2.7 | 1.3 | 0.6 | 0.1 | 0.0 | 0.0 | 0.1 | 1.0 | 2.2 | 4.4 | 20.3 |
1996–2025 normals for Solano County — the climate division Fairfield sits in. All-time county record high 110.9°F (2022-09-06); record low 18.6°F (1990-12-22). Source: NOAA / National Weather Service.