Atlanta Weather in September
United States · Humid Subtropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Atlanta sees average temperatures ranging from a low of 17.8°C (64.0°F) to a high of 27.2°C (81.0°F), with a mean of 22.1°C (71.8°F). Compared to the annual average of 16.7°C (62.1°F), this month is 5.4°C warmer than the yearly norm. Precipitation averages 177.4mm, making it approximately 42.0mm wetter than the monthly average of 136.0mm. The city receives an average of 9.5 hours of sunshine per day during September, with relative humidity averaging 73.1%. Wind speeds reach an average maximum of 16.8 km/h. For travelers, this month offers a temperature experience in Atlanta, with wetter-than-average conditions compared to the rest of the year.
Atlanta's humid subtropical climate creates hot summers and mild winters. I've studied the data and found that the city's tree canopy provides some relief from the summer heat. The best time for visiting is March to May and September to November, when temperatures are comfortable and the city's parks and outdoor attractions are most enjoyable.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 25.4°C (77.7°F) | 22.1°C (71.8°F) | 17.2°C (63.0°F) |
| Rainfall | 147.7mm | 177.4mm | 82.9mm |
| Sunshine | 10.8 hrs | 9.5 hrs | 9.2 hrs |
| Humidity | 76.7% | 73.1% | 71.2% |
| Wind | 14.5 km/h | 16.8 km/h | 16.8 km/h |
| Rainy Days | 24.4 | 14.4 | 8.8 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Atlanta in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Atlanta in September?
The average temperature in Atlanta during September ranges from 17.8°C (64.0°F) to 27.2°C (81.0°F), with a mean of 22.1°C (71.8°F).
How much does it rain in Atlanta in September?
Atlanta receives an average of 177.4mm of precipitation in September, spread across approximately 14.4 rainy days.
What should I pack for Atlanta in September?
Based on September weather data, pack layers including light jackets and t-shirts, plus an umbrella. Rain gear is essential — this month averages 177.4mm of precipitation.
Is September a good time to visit Atlanta?
September is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Atlanta
Cities with Similar September Climate (Humid Subtropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 33.75°, -84.39°. Timezone: America/New_York. Last updated: 2026-07-30.