The official National Weather Service forecast for Gustine — 37.2577°N, 120.9988°W, population 6,128, 5 miles from I-5. Forecasts here are written by NWS HNX, this county’s forecast office.
| Merced County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 57 | 62 | 67 | 73 | 81 | 89 | 95 | 93 | 89 | 79 | 65 | 57 | 76 |
| Avg low °F | 39 | 41 | 44 | 47 | 53 | 59 | 64 | 62 | 59 | 51 | 44 | 39 | 50 |
| Precip in | 2.4 | 2.0 | 1.7 | 0.9 | 0.4 | 0.1 | 0.0 | 0.0 | 0.0 | 0.6 | 1.2 | 2.2 | 11.5 |
1996–2025 normals for Merced County — the climate division Gustine sits in. All-time county record high 110.2°F (2022-09-07); record low 17.0°F (1990-12-22). Source: NOAA / National Weather Service.