January in Decatur averages a daily high of 11°C with nights around 0.5°C. Expect roughly 10 wet days totalling 129.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Decatur is April–May.
Based on DECATUR 4 SE, AL US (5.6km), 1995–2024. 25 years of January data.