The official National Weather Service forecast for Allegan — 42.5292°N, 85.8553°W, population 7,247, 18.4 miles from I-196. Forecasts here are written by NWS GRR, this county’s forecast office.
| Allegan County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 35 | 46 | 58 | 70 | 79 | 83 | 81 | 75 | 62 | 48 | 37 | 59 |
| Avg low °F | 19 | 19 | 27 | 37 | 47 | 57 | 61 | 60 | 52 | 42 | 32 | 24 | 40 |
| Precip in | 2.6 | 2.2 | 2.4 | 3.5 | 4.1 | 3.7 | 3.2 | 3.4 | 3.0 | 4.0 | 2.6 | 2.7 | 37.4 |
1996–2025 normals for Allegan County — the climate division Allegan sits in. All-time county record high 102.0°F (2012-07-07); record low -18.5°F (1996-02-03). Source: NOAA / National Weather Service.