The official National Weather Service forecast for Harrisville — 39.2095°N, 81.0518°W, 23.3 miles from I-77.
| Ritchie County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 41 | 45 | 55 | 67 | 76 | 82 | 85 | 84 | 79 | 68 | 56 | 46 | 65 |
| Avg low °F | 22 | 25 | 32 | 40 | 50 | 58 | 63 | 62 | 55 | 43 | 33 | 27 | 42 |
| Precip in | 3.6 | 3.4 | 3.9 | 4.0 | 4.9 | 5.0 | 5.0 | 4.0 | 3.5 | 3.2 | 2.9 | 3.6 | 47.0 |
1996–2025 normals for Ritchie County — the climate division Harrisville sits in. All-time county record high 101.9°F (1988-07-17); record low -26.0°F (1994-01-19). Source: NOAA / National Weather Service.