The official National Weather Service forecast for Summersville — 38.2812°N, 80.8526°W, 22.7 miles from I-79.
| Nicholas County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 45 | 54 | 65 | 72 | 79 | 81 | 80 | 76 | 65 | 53 | 44 | 63 |
| Avg low °F | 22 | 25 | 31 | 40 | 48 | 56 | 61 | 60 | 53 | 43 | 33 | 26 | 42 |
| Precip in | 3.7 | 3.6 | 3.9 | 4.4 | 5.5 | 5.4 | 5.8 | 4.3 | 4.0 | 3.6 | 3.3 | 3.8 | 51.3 |
1996–2025 normals for Nicholas County — the climate division Summersville sits in. All-time county record high 96.7°F (1988-07-17); record low -20.8°F (1994-01-19). Source: NOAA / National Weather Service.