The weather in Atlanta in September varies, from the intense heat and humidity of summer, especially in the earlier weeks of the month, and cooler weather more typical of fall. The average daily high is 82°F (28°C), although temperatures into the 90s are very common. Afternoon thunderstorms are still possible, although they are usually of short duration and are often fairly localised.
September is generally a good time of year to visit the city, with plenty of sun and slightly smaller crowds now the schools are back in session. On the hotter days, it can still be best to confine more active sightseeing or strenuous hiking to the earlier, cooler parts of the day.
→ When is the best time of year to visit Atlanta?
→ Weather in Atlanta in: January, February, March, April, May, June, July, August, October, November, December
Pack for warm weather, not forgetting to bring sunscreen and a hat, but also layers such as a light sweater for the evening. An umbrella or other rainwear will often come in useful, but in the event of inclement weather, Atlanta does offer a wide variety of indoor attractions and activities.
Atlanta’s inland location usually protects it from coastal hurricanes during the June to November hurricane season, but heavy rain, high winds and tropical storm conditions are possible throughout this period.
See also:
– September events in Atlanta
– Concerts in Atlanta
– Black heritage sites in Atlanta
– State parks and nature sites near Atlanta
The average daily high temperature in Atlanta in September is 82°F (28°C). The average daily low is 64°F (18°C).
Especially in recent years, it is not very common to see daily highs below 80°F (27°C), particularly at the beginning of the month when temperatures are often still as high as during the summer months.
In a typical September, you can expect the daily high to top 90°F (32°C) on half to two thirds of days, and temperatures approaching 100°F (38°C) are possible. Some years, by contrast (often associated with a long run of stormy weather), it might very seldom get this hot.
Humidity in Atlanta in September is high at 74%, and the weather will often feel very uncomfortably humid.
Sunshine in Atlanta in September averages 9 hours per day (average day length in September is 12.4 hours). Rain averages 3.3 inches during the month, with rain falling on an average of 7 days.
September in Atlanta is usually a very sunny month, with completely clear or mostly sunny weather on most days through the month. Sometimes there may be a cloudy morning or afternoon, and while afternoon rain showers and thunderstorms are still quite possible at this time of year, they are not as frequent as during the peak of summer.
Unless there is a large storm system passing through (which does not happen every year), mostly or completely cloudy days are rare in Atlanta in September, occurring on only a very small number of days during the typical year.
The average UV index in September is 8.
In September, the sun rises at around 7:10am at the beginning of the month and at 7:30am at the end of the month. It begins to get light in the morning at 6:45am at the start of the month, and by 7:05am at the end.
The sun sets at around 8:05pm at the start of the month, and at around 7:25pm by its end. It should be dark by around 8:30pm at the beginning of the month, and by 7:50pm at its end.
The amount of full daylight in September averages around 12 hours 25 minutes per day, plus an additional 25 minutes of low light at the beginning and end of the day.
Although hurricanes can impact coastal regions of Georgia throughout the hurricane season of June through November (with the majority of stronger storms falling in the later part of the season), Atlanta is usually too far inland to be affected severely.
You can expect to see heavy rain and strong winds in Atlanta and its vicinity when a hurricane is forecast for the coast, but extremely dangerous weather is unlikely. Localised flooding and power outages, some property damage and flight disruptions are possible.