September in Athens averages a daily high of 29.2°C with nights around 17.4°C. Expect roughly 7.4 wet days totalling 95.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Athens is March–May.
Based on ATHENS BEN EPPS AIRPORT, GA US (4.9km), 1995–2024. 30 years of September data.