Atlanta weather in September: Atlanta, Georgia: normal highs, lows, rain and records for September
Atlanta in September has a normal high of 84°F and a normal low of 66°F, a daily mean of 75°F, falling from 87°F on the 1st to 80°F by the 30th. Measurable precipitation falls on 7 days in a normal September, 3.82 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 19°C, 97 mm of precipitation in September.
- NOAA stationAtlanta Hartsfield International Airport
- Station IDUSW00013874
- Location33.63°N 84.44°W
- Elevation1,010 ft (308 m)
- From the center9 miles
- Population520,070
- Jan 54° 36°
- Feb 58° 39°
- Mar 66° 45°
- Apr 74° 53°
- May 81° 61°
- Jun 87° 69°
- Jul 90° 72°
- Aug 89° 71°
- Sep 84° 66°
- Oct 74° 55°
- Nov 64° 44°
- Dec 56° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Atlanta in September?
The normal high is 84°F and the normal low 66°F, for a daily mean of 74.9°F. September is 5.3°F cooler than August and 10.2°F warmer than October. September is the 4th warmest month of the year in Atlanta and the 9th wettest. Across the month the normal high falls 7°F, from 87°F on September 1 to 80°F on September 30. From one year to the next September's mean temperature typically moves about 2.6°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 72°F and 78°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 29%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 87°F | 70°F | 29% | 18% |
| September 8 | 86°F | 68°F | 26% | 17% |
| September 15 | 84°F | 66°F | 24% | 16% |
| September 22 | 82°F | 64°F | 23% | 16% |
| September 30 | 80°F | 61°F | 23% | 15% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 87°F | 70°F | 29% | 18% | 12 h 50 min |
| September 2 | 87°F | 69°F | 28% | 18% | 12 h 50 min |
| September 3 | 87°F | 69°F | 28% | 18% | 12 h 50 min |
| September 4 | 87°F | 69°F | 27% | 18% | 12 h 50 min |
| September 5 | 86°F | 69°F | 27% | 17% | 12 h 50 min |
| September 6 | 86°F | 69°F | 27% | 17% | 12 h 40 min |
| September 7 | 86°F | 68°F | 26% | 17% | 12 h 40 min |
| September 8 | 86°F | 68°F | 26% | 17% | 12 h 40 min |
| September 9 | 86°F | 68°F | 26% | 17% | 12 h 40 min |
| September 10 | 85°F | 68°F | 25% | 16% | 12 h 40 min |
| September 11 | 85°F | 67°F | 25% | 16% | 12 h 30 min |
| September 12 | 85°F | 67°F | 25% | 16% | 12 h 30 min |
| September 13 | 85°F | 67°F | 25% | 16% | 12 h 30 min |
| September 14 | 85°F | 67°F | 24% | 16% | 12 h 30 min |
| September 15 | 84°F | 66°F | 24% | 16% | 12 h 30 min |
| September 16 | 84°F | 66°F | 24% | 16% | 12 h 20 min |
| September 17 | 84°F | 66°F | 24% | 16% | 12 h 20 min |
| September 18 | 84°F | 65°F | 24% | 16% | 12 h 20 min |
| September 19 | 83°F | 65°F | 24% | 16% | 12 h 20 min |
| September 20 | 83°F | 65°F | 24% | 16% | 12 h 20 min |
| September 21 | 83°F | 65°F | 24% | 16% | 12 h 10 min |
| September 22 | 82°F | 64°F | 23% | 16% | 12 h 10 min |
| September 23 | 82°F | 64°F | 23% | 16% | 12 h 10 min |
| September 24 | 82°F | 64°F | 23% | 15% | 12 h 10 min |
| September 25 | 82°F | 63°F | 23% | 15% | 12 h 10 min |
| September 26 | 81°F | 63°F | 23% | 15% | 12 h |
| September 27 | 81°F | 62°F | 23% | 15% | 12 h |
| September 28 | 81°F | 62°F | 23% | 15% | 12 h |
| September 29 | 80°F | 62°F | 23% | 15% | 12 h |
| September 30 | 80°F | 61°F | 23% | 15% | 11 h 50 min |
- Normal high
- 84°FSeptember average
- Normal low
- 66°FSeptember average
- Precipitation
- 3.82 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 5
- Daylight
- 12 h 50 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 29
- Days at 80°F or more
- 22
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013874; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Atlanta in September?
On a given September day the chance of 0.01 inch or more is 25% on average, highest around September 1 (29%). In all, 3.82 in falls on 7 days of a normal September, 1 of them with an inch or more.
In a normal September in Atlanta, 5 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013874.
How humid and windy is Atlanta in September?
At 3 p.m. the normal temperature is 77°F with 50% relative humidity and a dew point of 57°F; at 6 a.m. it is 63°F with 84% humidity. The wind averages 7.9 mph, most often from the north-northeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 63°F | 58°F | 84% | 7.1 mph | 52% |
| 9 a.m. | 68°F | 58°F | 73% | 8.8 mph | 46% |
| noon | 75°F | 58°F | 56% | 9.2 mph | 39% |
| 3 p.m. | 77°F | 57°F | 50% | 9.3 mph | 36% |
| 6 p.m. | 74°F | 57°F | 55% | 8.5 mph | 47% |
| 9 p.m. | 69°F | 58°F | 68% | 7.2 mph | 56% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013874. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Atlanta?
The warmest September temperature on Atlanta's official record (since 1878) is 102°F, on September 8, 1925; the coldest is 36°F, on September 30, 1967. The wettest September brought 14.26 in (1888).
The September mean against the 1991-2020 normal of 74.9°F: 2021 73.9°F (−1.0), 2022 74.7°F (−0.3), 2023 75.8°F (+0.9), 2024 76.3°F (+1.4), 2025 77.4°F (+2.5), 2026 78.6°F (+3.7). 4 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 73.9°F | −1.0°F | 3.60 in |
| 2022 | 74.7°F | −0.3°F | 0.99 in |
| 2023 | 75.8°F | +0.9°F | 1.29 in |
| 2024 | 76.3°F | +1.4°F | 12.29 in |
| 2025 | 77.4°F | +2.5°F | 0.16 in |
| 2026 | 78.6°F | +3.7°F | 3.10 in |
Source: records: ACIS, NWS threaded record ATLthr; recent months: ACIS, station USW00013874. Records and recent months use complete months only.
How does September in Atlanta compare across Georgia?
Across the 101 places PlainClimate covers in Georgia, September normal highs run from 72°F in Mountain City to 90°F in Bainbridge; Atlanta's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.