The official National Weather Service forecast for Castroville — 36.7658°N, 121.758°W, population 12,334, 38.8 miles from I-280. Forecasts here are written by NWS MTR, this county’s forecast office.
| Monterey County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 61 | 62 | 65 | 69 | 75 | 82 | 87 | 87 | 84 | 77 | 67 | 60 | 73 |
| Avg low °F | 38 | 38 | 40 | 42 | 46 | 50 | 54 | 54 | 52 | 47 | 41 | 38 | 45 |
| Precip in | 4.3 | 4.1 | 2.9 | 1.4 | 0.5 | 0.0 | 0.0 | 0.0 | 0.1 | 0.9 | 2.1 | 4.2 | 20.5 |
1996–2025 normals for Monterey County — the climate division Castroville sits in. All-time county record high 110.5°F (2020-09-07); record low 11.8°F (1990-12-22). Source: NOAA / National Weather Service.