September in Atlanta averages a daily high of 28.9°C with nights around 17.4°C. Expect roughly 8.5 wet days totalling 93mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Atlanta is March–May.
Based on ATLANTA FULTON CO AIRPORT, GA US (13km), 1995–2024. 26 years of September data.