The official National Weather Service forecast for Decatur — 34.6059°N, 86.9833°W, population 60,458, 4.7 miles from I-65. Forecasts here are written by NWS HUN, this county’s forecast office.
| Morgan County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 51 | 56 | 65 | 73 | 80 | 87 | 89 | 89 | 84 | 74 | 63 | 54 | 72 |
| Avg low °F | 31 | 35 | 41 | 49 | 58 | 66 | 69 | 68 | 62 | 50 | 40 | 34 | 50 |
| Precip in | 5.4 | 5.2 | 5.6 | 5.4 | 4.6 | 4.3 | 4.6 | 3.8 | 3.7 | 3.4 | 4.2 | 5.6 | 55.8 |
1996–2025 normals for Morgan County — the climate division Decatur sits in. All-time county record high 107.3°F (1952-07-29); record low -12.8°F (1966-01-30). Source: NOAA / National Weather Service.