The official National Weather Service forecast for Decatur — 35.5148°N, 84.7902°W, 8.3 miles from I-75.
| Meigs County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 49 | 54 | 63 | 71 | 79 | 86 | 89 | 88 | 83 | 73 | 61 | 52 | 71 |
| Avg low °F | 29 | 33 | 39 | 46 | 56 | 64 | 68 | 66 | 60 | 48 | 37 | 33 | 48 |
| Precip in | 5.1 | 5.3 | 5.4 | 5.0 | 4.5 | 4.6 | 4.9 | 3.8 | 4.4 | 3.2 | 4.3 | 5.9 | 56.4 |
1996–2025 normals for Meigs County — the climate division Decatur sits in. All-time county record high 105.8°F (1980-07-17); record low -13.4°F (1985-01-21). Source: NOAA / National Weather Service.