Atlanta weather in September
September in Atlanta: hot, rainy — an excellent time to visit.
#4 of 12 months in Atlanta · #257 of 604 destinations to visit in September · comfort 82/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Atlanta climate normals — September
| Daytime high | 28°C / 82°F | 🥵 hot |
|---|---|---|
| Nighttime low | 18°C / 65°F | |
| Feels like (high) | 30°C / 86°F | |
| Rainfall | 92 mm / 3.6 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 70% | 💧 humid |
| Dew point | 16°C / 60°F | |
| Sunshine | 9.8 h/day | |
| Daylight | 12.4 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 55 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Atlanta in September — FAQ
- Is September a good time to visit Atlanta?
- September in Atlanta: hot, rainy — an excellent time to visit. It ranks #4 of 12 months for Atlanta on SeasonMap's comfort score (82/100).
- What is the weather like in Atlanta in September?
- In September, Atlanta averages a daily high of 27.8°C and a low of 18.4°C, with about 91.5 mm of rain over roughly 9.8 rainy days.
- What is the air quality in Atlanta in September?
- Atlanta has a mean US Air Quality Index of about 55 in September.