The official National Weather Service forecast for Pentwater — 43.7817°N, 86.4331°W, 43.4 miles from I-96. Forecasts here are written by NWS GRR, this county’s forecast office.
| Oceana County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 30 | 33 | 43 | 56 | 68 | 77 | 81 | 79 | 73 | 59 | 46 | 35 | 57 |
| Avg low °F | 17 | 17 | 24 | 34 | 44 | 53 | 58 | 57 | 50 | 40 | 31 | 23 | 37 |
| Precip in | 2.3 | 1.8 | 2.3 | 3.4 | 3.8 | 3.6 | 3.0 | 3.3 | 3.0 | 3.9 | 2.9 | 2.5 | 35.8 |
1996–2025 normals for Oceana County — the climate division Pentwater sits in. All-time county record high 98.0°F (2012-07-07); record low -24.8°F (1996-02-03). Source: NOAA / National Weather Service.