May in Decatur averages a daily high of 26.3°C with nights around 15.5°C. Expect roughly 9.6 wet days totalling 120mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Decatur is April–May.
Based on DECATUR 4 SE, AL US (5.6km), 1995–2024. 20 years of May data.