The official National Weather Service forecast for Decatur — 42.1081°N, 85.9745°W, 5.8 miles from I-94. Forecasts here are written by NWS GRR, this county’s forecast office.
| Van Buren County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 35 | 46 | 59 | 70 | 80 | 83 | 81 | 75 | 62 | 49 | 37 | 59 |
| Avg low °F | 19 | 20 | 28 | 37 | 47 | 57 | 61 | 60 | 53 | 42 | 33 | 24 | 40 |
| Precip in | 2.5 | 2.2 | 2.4 | 3.4 | 4.1 | 4.0 | 3.4 | 3.7 | 3.1 | 4.1 | 2.5 | 2.6 | 38.0 |
1996–2025 normals for Van Buren County — the climate division Decatur sits in. All-time county record high 101.6°F (2012-07-07); record low -16.6°F (1996-02-03). Source: NOAA / National Weather Service.