The official National Weather Service forecast for Hamilton — 32.7579°N, 84.8749°W, 8.8 miles from I-185. Forecasts here are written by NWS FFC, this county’s forecast office.
| Harris County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 57 | 62 | 69 | 76 | 83 | 88 | 90 | 90 | 85 | 76 | 67 | 59 | 75 |
| Avg low °F | 34 | 38 | 43 | 49 | 58 | 66 | 69 | 69 | 63 | 52 | 42 | 37 | 52 |
| Precip in | 4.7 | 4.7 | 4.9 | 4.6 | 3.8 | 4.5 | 4.6 | 4.2 | 3.8 | 2.8 | 3.6 | 5.2 | 51.4 |
1996–2025 normals for Harris County — the climate division Hamilton sits in. All-time county record high 103.6°F (2012-07-01); record low -4.7°F (1985-01-21). Source: NOAA / National Weather Service.