The official National Weather Service forecast for Olivet — 42.4414°N, 84.9241°W, 1.3 miles from I-69. Forecasts here are written by NWS GRR, this county’s forecast office.
| Eaton County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 31 | 34 | 45 | 58 | 69 | 79 | 83 | 80 | 74 | 61 | 47 | 36 | 58 |
| Avg low °F | 17 | 18 | 26 | 36 | 47 | 57 | 60 | 59 | 51 | 41 | 31 | 23 | 39 |
| Precip in | 2.3 | 2.1 | 2.3 | 3.3 | 4.2 | 3.8 | 3.4 | 3.6 | 2.9 | 3.6 | 2.4 | 2.2 | 36.1 |
1996–2025 normals for Eaton County — the climate division Olivet sits in. All-time county record high 101.9°F (2012-07-07); record low -19.0°F (1994-01-19). Source: NOAA / National Weather Service.