The official National Weather Service forecast for Fort Seneca — 41.2092°N, 83.1688°W, 13.5 miles from I-90.
| Seneca County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 37 | 48 | 61 | 72 | 81 | 84 | 82 | 77 | 64 | 50 | 39 | 61 |
| Avg low °F | 19 | 22 | 30 | 39 | 50 | 60 | 63 | 61 | 54 | 44 | 33 | 25 | 42 |
| Precip in | 2.4 | 2.3 | 2.7 | 3.6 | 4.1 | 4.0 | 4.1 | 3.6 | 3.1 | 2.9 | 2.5 | 2.6 | 37.9 |
1996–2025 normals for Seneca County — the climate division Fort Seneca sits in. All-time county record high 102.6°F (1988-06-26); record low -21.9°F (1994-01-19). Source: NOAA / National Weather Service.