The official National Weather Service forecast for Seymour — 35.8906°N, 83.7246°W, population 15,219, 7.8 miles from I-40.
| Sevier County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 46 | 51 | 60 | 68 | 76 | 82 | 85 | 84 | 79 | 69 | 59 | 50 | 67 |
| Avg low °F | 27 | 31 | 37 | 44 | 53 | 61 | 65 | 64 | 58 | 47 | 36 | 31 | 46 |
| Precip in | 5.2 | 5.0 | 5.0 | 5.0 | 4.8 | 5.3 | 5.6 | 4.4 | 4.1 | 3.6 | 4.1 | 4.9 | 57.0 |
1996–2025 normals for Sevier County — the climate division Seymour sits in. All-time county record high 100.6°F (2012-07-01); record low -17.7°F (1985-01-21). Source: NOAA / National Weather Service.