September in Atlanta, Georgia is a true transition month. Summer’s heat starts to ease, but the city still feels warm, humid, and occasionally stormy. If you live in Atlanta—or you’re visiting for a game, a festival, or a work trip—knowing what September weather is really like can help you pack smart, plan outdoor time, and avoid surprises.
September in Atlanta is best described as late summer sliding into early fall.
Here’s a quick overview:
| Weather Factor | Typical September Pattern in Atlanta |
|---|---|
| High temperatures | Often in the low to mid 80s°F, occasionally upper 80s |
| Low temperatures | Commonly in the mid 60s°F, sometimes upper 60s |
| Humidity | Moderate to high, muggy early in the month |
| Rain | Scattered showers and storms; some days very dry, some wet |
| Storm risk | Afternoon thunderstorms still possible |
| Air quality | Often decent, but can be hazy on hot, still days |
You’ll feel that it’s still summer-like, especially around Labor Day, but by late September mornings and evenings can start to feel noticeably more comfortable.
Short heat spikes can still push temperatures close to 90°F, especially the first half of the month, so plan for warm-weather clothing: light shirts, shorts, and breathable fabrics.
Evenings are often pleasant for outdoor dining, walks on the BeltLine, or catching a game at Truist Park or Mercedes-Benz Stadium, but you might want a light layer if you run cold.
Humidity remains a major factor in Atlanta weather in September, particularly during the first half of the month.
If you’re spending long periods outside—walking the Atlanta BeltLine, exploring Piedmont Park, or attending festivals—plan for:
September is part of Atlanta’s late-summer storm season. While not the rainiest month, it can bring:
Thunderstorms often form in the afternoon to early evening, so morning activities are frequently less affected.
Because Atlanta sits inland but still within reach of Gulf and Atlantic weather, remnants of tropical storms or hurricanes can sometimes:
These events do not happen every year, but they’re common enough that it’s wise to keep an eye on forecasts if a named storm is in the news during your visit.
You get plenty of usable daylight for outdoor activities.
Sky conditions vary from:
Sunscreen is still important; the sun angle is a bit lower than July, but UV exposure can still be strong, especially in the middle of the day.
If you’re visiting—or just refreshing your wardrobe—focus on flexibility. September can swing from hot and sticky to mild and breezy.
If you’re attending a more formal event (weddings, conferences), consider lightweight dress clothes—Atlanta’s heat and humidity can make heavy fabrics uncomfortable.
September is often a great month for outdoor events in Atlanta, with many local favorites scheduled this time of year.
You’ll frequently find:
Plan to:
Popular spots like:
are often busy in September. Conditions are usually:
Check the hour-by-hour forecast if you’re planning activities like hiking, outdoor concerts, or long bike rides.
It’s smart to allow a little extra travel time when the forecast mentions storms.
If you’re using MARTA, walking between stations, or exploring neighborhoods:
Areas around Downtown, Midtown, and Buckhead are all walkable in parts, but shade is not guaranteed, so plan accordingly.
On many days, air quality in Atlanta during September is acceptable for most people, but occasionally:
Late summer and early fall can be bothersome for some allergy sufferers, especially with:
If you’re sensitive, it can help to:
For personalized medical guidance, local residents can consult healthcare providers in the Atlanta area; this overview is informational only.
If you live in Atlanta or are staying for a while, you can track September weather and alerts through:
City of Atlanta emergency information:
Atlanta City Hall
55 Trinity Ave SW
Atlanta, GA 30303
Main information line: (404) 330-6000
DeKalb and Fulton County emergency management offices (for county-level alerts and preparedness resources)
These agencies share information during significant weather events, such as tropical system remnants or severe storms that may impact the city.
Here are some simple ways to stay comfortable and prepared:
Understanding Atlanta weather in September helps you make the most of this in-between season: warm enough for summer-style plans, with just enough hints of fall to make evenings especially enjoyable.
