The official National Weather Service forecast for Sistersville — 39.5642°N, 80.9959°W, 24 miles from I-77.
| Tyler County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 44 | 54 | 66 | 75 | 82 | 85 | 84 | 79 | 67 | 55 | 45 | 65 |
| Avg low °F | 22 | 25 | 31 | 40 | 49 | 58 | 62 | 62 | 55 | 43 | 33 | 27 | 42 |
| Precip in | 3.7 | 3.4 | 3.9 | 4.1 | 4.8 | 5.1 | 4.8 | 4.0 | 3.6 | 3.2 | 3.0 | 3.7 | 47.3 |
1996–2025 normals for Tyler County — the climate division Sistersville sits in. All-time county record high 101.6°F (1988-07-17); record low -26.5°F (1994-01-19). Source: NOAA / National Weather Service.