The official National Weather Service forecast for Allendale — 42.9723°N, 85.9536°W, population 25,094, 6.9 miles from I-96. Forecasts here are written by NWS GRR, this county’s forecast office.
| Ottawa County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 35 | 45 | 58 | 69 | 79 | 83 | 81 | 75 | 61 | 48 | 37 | 59 |
| Avg low °F | 19 | 19 | 26 | 36 | 47 | 57 | 61 | 59 | 52 | 42 | 32 | 25 | 40 |
| Precip in | 2.4 | 2.0 | 2.4 | 3.5 | 3.8 | 3.5 | 2.9 | 3.1 | 2.9 | 4.0 | 2.6 | 2.5 | 35.6 |
1996–2025 normals for Ottawa County — the climate division Allendale sits in. All-time county record high 101.2°F (2012-07-07); record low -20.1°F (1996-02-03). Source: NOAA / National Weather Service.