The official National Weather Service forecast for Colfax — 39.1007°N, 120.9533°W, 2.4 miles from I-80. Forecasts here are written by NWS STO, this county’s forecast office.
| Placer County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 50 | 51 | 55 | 61 | 70 | 79 | 87 | 86 | 80 | 69 | 57 | 49 | 66 |
| Avg low °F | 32 | 32 | 34 | 38 | 44 | 51 | 57 | 56 | 52 | 44 | 36 | 32 | 42 |
| Precip in | 7.9 | 7.9 | 6.6 | 3.7 | 2.3 | 0.6 | 0.0 | 0.2 | 0.6 | 2.7 | 4.9 | 9.0 | 46.4 |
1996–2025 normals for Placer County — the climate division Colfax sits in. All-time county record high 102.2°F (1972-07-15); record low 2.5°F (1972-12-09). Source: NOAA / National Weather Service.