What September feels like in Atlanta
Early autumn arrives in Atlanta with September. Afternoons are warm and pleasant, good for long days out. After sunset it cools off noticeably — nights stay mild. Some humidity hangs in the air, noticeable when the sun is strong.
Rain in Atlanta in September
It is a changeable month: rain comes about one day in 3, with dry spells in between. Rain tends to come in heavy bursts: about 10.9 mm (0.4 in) on an average rainy day. Across the year Atlanta averages about 10.1 mm per rainy day, so September is typical.
Daylight and sunshine in September
Mid-month, Atlanta gets 12 h 26 min of daylight, from sunrise near 7:20 am to sunset near 7:46 pm. Evenings are drawing in — 1 h 1 min less daylight than mid-August. The sun is out for roughly 79% of those daylight hours, so there are plenty of bright spells.
How September compares to the rest of the year
In Atlanta's temperature order, September sits as the 4th warmest month. Against August, the average high is 2.7°C (4.9°F) lower, with 23 mm less rain. Temperatures keep falling into October. By October, typical highs are 22.5°C (72.5°F).
Who September suits
- Sightseeing: a good fit — comfortable enough to explore on foot all day.
- Parks & outdoor: less ideal — afternoons are too warm to linger outside.
Tips for visiting Atlanta in September
Versatile Layers
Mornings and evenings are cooler than midday, so dress in layers.
Rain Protection
A compact umbrella and a light waterproof jacket.
Sunglasses
Bright days make sunglasses worth packing.
Quick questions
How warm is Atlanta in September?
Expect around 27.8°C (82°F) in the afternoon and 18.5°C (65.3°F) at night, which most visitors would call warm.
Does it rain a lot in Atlanta in September?
It does: about 9 rainy days bring roughly 98 mm, so plan some indoor options.
What should I wear in Atlanta in September?
The numbers point to versatile layers, rain protection and sunglasses. Evenings feel similar to the day, so the same clothes work from morning to night.
Is September or October better for visiting Atlanta?
On our 12-month climate ranking, October comes out ahead (#1 of 12 vs #4). October is cooler and has fewer rainy days.