Atlanta, GA weather in September
September in Atlanta: warm and often humid, with some rain. Highs 84°F, lows 66°F, about 7 days with rain.
- Normal high
- 84°F
- Normal low
- 66°F
- Wet days
- 7
- 3.8 in total
- Muggy days
- 12
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 87°F | 80°F |
| Normal low | 70°F | 61°F |
| Chance of a wet day | 27% | 23% |
| Sunrise / sunset | 7:11 am / 8:03 pm | 7:31 am / 7:23 pm |
| Daylight | 12.9 h | 11.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical September day
- 6 am67°Fdew point 62°F
- 9 am72°Fdew point 63°F
- Noon79°Fdew point 62°F
- 3 pm82°Fdew point 61°F
- 6 pm79°Fdew point 61°F
- 9 pm74°Fdew point 62°F
NOAA hourly normals (local standard time) from Atlanta Hartsfield Intl Airport (9 mi away); average wind 7 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F5 of 30
- Hot dayshigh 90°F or more5 of 30
- Muggy daysdaily mean dew point 65°F or more12 of 30
- Wet daysat least 0.01 in of rain or melted snow7 of 30
- Notable rainat least 0.10 in5 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 3.8 in; a dry September brings about 2.1 in and a wet one about 4.7 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202019: average high 93°F
- Coolest September2000: average high 79°F
- Wettest September2004: 13.7 in
- Driest September2005: 0.07 in
- Highest reading99°F (September 12, 2019)
- Lowest reading43°F (September 26, 2001)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 89°F | 84°F | 74°F |
| Normal low | 71°F | 66°F | 55°F |
| Wet days | 10 | 7 | 7 |
| Comfortable days | 0 | 5 | 17 |
| Daylight | 13.4 h | 12.4 h | 11.3 h |
Highs change by -5°F from August and -10°F into October.
Nearby alternatives in September
- Warmer: Montgomery, AL146 mi · high 89°F · 7 wet days
- Cooler: Gatlinburg, TN145 mi · high 78°F · 11 wet days
How Atlanta ranks in September
- Normal high146th warmest of 378 cities; 7th of 8 in Georgia
- Wet days164th driest of 378
- Comfortable days211th most of 342
Heating and cooling
September has 5 heating degree days and 302 cooling degree days (base 65°F), 7% of the year's total heating and cooling demand.
Questions
How hot is Atlanta in September?
The normal high is 84°F and the normal low is 66°F. From 1991 to 2020 the hottest September reading was 99°F (most recently on September 12, 2019).
Does it rain a lot in Atlanta in September?
About 7 days in September have at least 0.01 in of precipitation, and the normal total is 3.8 in. The wettest September in 1991-2020 was in 2004 (13.7 in); the driest was in 2005 (0.07 in).
Is September a good time to visit Atlanta?
September ranks 7th of 12 months on our comfort score for Atlanta (52 out of 100). It has about 5 comfortable days and about 5 days at 90°F or hotter. The best month is April.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates and humidity and wind by hour: Atlanta Hartsfield Intl Airport (USW00013874), 8.8 mi SSW of the city center, 1,010 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Hartsfield-Jackson Atlanta Intl Airport (722190-13874), 8.8 mi SSW of the city center, 1,011 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).