The official National Weather Service forecast for Knoxville — 41.3208°N, 93.1094°W, population 7,561, 24.9 miles from I-80.
| Marion County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 31 | 36 | 50 | 62 | 72 | 82 | 85 | 84 | 78 | 65 | 50 | 37 | 61 |
| Avg low °F | 14 | 17 | 29 | 40 | 50 | 61 | 65 | 62 | 54 | 42 | 30 | 19 | 40 |
| Precip in | 1.1 | 1.3 | 2.0 | 3.5 | 4.9 | 5.3 | 4.2 | 3.8 | 3.2 | 3.0 | 1.8 | 1.4 | 35.5 |
1996–2025 normals for Marion County — the climate division Knoxville sits in. All-time county record high 105.3°F (2012-07-24); record low -27.3°F (1996-02-03). Source: NOAA / National Weather Service.