September in Atlanta is a transition month. Summer heat is still hanging on, but hints of fall start to show up—especially later in the month. If you live in Atlanta, are planning a visit, or are scheduling an event, it helps to know what September weather usually brings and how it can affect your day-to-day plans.
September is typically:
In short, you’re unlikely to need a jacket most days, but you will want breathable clothing and a flexible plan in case of rain.
While day-to-day weather can vary, September temperatures in Atlanta usually sit in a comfortable—but often still summery—range.
| Time of Day | Typical Temperature (Approx.) | What It Feels Like |
|---|---|---|
| Early Morning (6–9 a.m.) | Upper 60s to low 70s °F | Mild, sometimes a bit muggy |
| Afternoon (2–5 p.m.) | Low to mid-80s °F, sometimes upper 80s | Warm to hot, can feel hotter in direct sun |
| Evening (7–10 p.m.) | Low to mid-70s °F | Generally pleasant, still warm |
Early in September, temperatures often resemble late summer, with some days edging into the upper 80s. By the end of the month, afternoons tend to feel more like early fall, especially if a cool front moves through.
Atlanta’s September humidity remains noticeable, especially in the first half of the month.
If you’re spending time outside—walking the BeltLine, exploring Piedmont Park, or attending a game at Mercedes-Benz Stadium—expect it to feel warmer in direct sun and plan breaks in shade or air-conditioned spaces.
September is an active weather month for rain and storms in the Atlanta area.
Keeping a compact umbrella or lightweight rain jacket handy is wise, especially if you walk or take MARTA.
While Atlanta is well inland, Atlantic hurricane season can indirectly influence September weather:
For updated local alerts, Atlanta residents and visitors can monitor:
September usually offers a good mix of sun and clouds in Atlanta.
If you’re sensitive to air quality, you can routinely check local conditions through regional air monitoring services or weather providers that cover the Atlanta metro.
Planning your wardrobe around September weather in Atlanta is mostly about staying cool and adaptable.
For most days, you’ll be comfortable in:
You typically do not need heavy jackets or coats. A light sweater is sometimes helpful for cooler late nights, especially toward the end of the month.
September is a popular month for outdoor events in Atlanta because conditions are still summer-like but slowly becoming more comfortable.
With warm temperatures and frequent sunshine, this is a great time to:
Just remember:
Atlanta’s sports calendar is active in September:
Most larger venues are indoors or partially covered, but tailgating, walking to and from MARTA, or exploring nearby neighborhoods will still put you in warm, sometimes humid conditions.
Hartsfield-Jackson Atlanta International Airport is busy year-round. In September:
Build in a bit of time buffer if you have connecting flights, and check forecasts and airline alerts on travel days.
Road conditions are usually good, but:
If you’re not familiar with Atlanta roads, allow extra time in the schedule on days with rain in the forecast.
To put September weather into local context:
Compared to July and August:
Compared to October:
If you’re deciding between visiting in late September or October, September gives more of a late-summer feel, while October leans more toward true fall.
A few simple habits go a long way during Atlanta’s September weather:
For Atlanta-specific weather updates, watches, and warnings, residents and visitors commonly rely on a mix of local and national sources. Two key official resources include:
National Weather Service – Peachtree City (Atlanta Metro Coverage)
City of Atlanta – Office of Emergency Preparedness
These resources are especially useful during weeks when tropical systems or strong storm fronts may influence metro Atlanta.
Knowing how Atlanta weather in September usually behaves makes it easier to pack, schedule events, and move through daily life comfortably. Expect mostly warm, often humid days, a real chance of passing showers or storms, and the first subtle signs that fall is on the way.
