The official National Weather Service forecast for Upper Sandusky — 40.8273°N, 83.2813°W, population 6,628, 24.4 miles from I-75.
| Wyandot County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 34 | 38 | 49 | 62 | 72 | 81 | 84 | 82 | 77 | 65 | 51 | 39 | 61 |
| Avg low °F | 20 | 22 | 30 | 40 | 50 | 60 | 63 | 61 | 55 | 44 | 33 | 25 | 42 |
| Precip in | 2.3 | 2.2 | 2.7 | 3.5 | 4.2 | 4.0 | 3.9 | 3.4 | 3.1 | 2.9 | 2.5 | 2.7 | 37.4 |
1996–2025 normals for Wyandot County — the climate division Upper Sandusky sits in. All-time county record high 102.6°F (1988-06-26); record low -22.7°F (1994-01-19). Source: NOAA / National Weather Service.