Atlanta weather in September

In September, Atlanta sees average daytime highs of 82°F and overnight lows near 64°F, with 3.5 in of rain across 8.4 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 85°F in the first days to 79°F by the end. The sky is clear or mostly clear about 38% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Atlanta's 3rd-clearest and 9th-windiest month. For the whole year in context, see Atlanta's year-round climate.

Daytime high
82°
4th warmest
Overnight low
64°
9th coldest
Rainfall
3.5 in
8.4 wet days
Daylight
12 h 12 min
6:26 AM – 6:38 PM
Cloud cover
53%
3rd clearest
Wind
6 mph
9th windiest
Solar energy
4.62 kWh/m²
Travel score
6.2
out of 10

Atlanta is capital city of the U.S. state of Georgia and seat of Fulton County, also located in DeKalb County.

Density
1,468/km²
people per km²
Founded
1845

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 85°F in the first days to 79°F by the end.

A typical September day in Atlanta reaches about 82°F in the afternoon and slips back to 64°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 90°F. Set against its neighbours, September runs about 5°F cooler than August and about 9°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18668
28668
38568
48568
58567
68567
78567
88567
98466
108466
118466
128466
138365
148365
158365
168364
178264
188264
198264
208263
218163
228162
238062
248062
258061
267961
277961
287960
297860
307859

How September really feels in Atlanta

Once humidity and wind are folded in, September averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Atlanta weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan53° / 35°4.210.10.7103.0
Feb57° / 38°4.49.70.410.74.0
Mar64° / 44°4.410.20.111.75.8
Apr73° / 52°3.59.1012.86.9
May80° / 61°3.09.7013.76.5
Jun86° / 68°3.813.9014.24.6
Jul88° / 71°4.215.50143.8
Aug87° / 70°3.812.5013.34.3
Sep82° / 64°3.58.4012.26.2
Oct73° / 53°3.06.7011.27.4
Nov63° / 43°3.78010.25.9
Dec55° / 37°4.310.10.39.83.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 44%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25446
35446
45446
55545
65545
75644
85743
95743
105743
115842
125842
135842
145743
155743
165644
175545
185545
195545
205545
215545
225545
235545
245545
255545
265743
275743
285743
295743
305743

Chance of precipitation in September

Any precipitation

Atlanta gets around 3.5 in of rain over 8.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 27% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
133
232
331
430
529
628
728
827
926
1026
1125
1225
1325
1425
1526
1626
1727
1827
1928
2028
2128
2228
2328
2428
2527
2627
2726
2825
2925
3024

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 30% of days. Sticky, muggy-or-worse air turns up on roughly 41% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1310234123
2410244022
3511253921
4511253919
5612263818
6713263717
7814273615
8914273514
91015273413
101116273412
111217273312
121317273211
131418263211
141518263110
151618263010
16171926309
17171926299
18181926289
19191926289
20201925278
21211925278
22222025267
23242025257
24252024246
25272024246
26282024235
27292023225
28312023224
29322123214
30332122203

Wind in September

Winds average 6 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over September. Sunrise moves from 6:15 AM to 6:36 AM, and sunset from 6:59 PM to 6:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:156:59
212.76:166:58
312.76:176:57
412.66:176:55
512.66:186:54
612.66:196:52
712.56:196:51
812.56:206:50
912.56:216:48
1012.46:216:47
1112.46:226:45
1212.36:236:44
1312.36:246:42
1412.36:246:41
1512.26:256:40
1612.26:266:38
1712.26:266:37
1812.16:276:35
1912.16:286:34
2012.16:296:32
2112.06:296:31
2212.06:306:29
2312.06:316:28
2411.96:316:27
2511.96:326:25
2611.86:336:24
2711.86:346:22
2811.86:346:21
2911.76:356:19
3011.76:366:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.62 kWh/m².

For context, solar energy here swings from a low near 2.31 kWh/m² to a high of 6.07 kWh/m² in May across the year — September's 4.62 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
74.9Bright
84.9Bright
94.9Bright
104.8Bright
114.8Bright
124.8Bright
134.7Bright
144.7Bright
154.7Bright
164.6Bright
174.6Bright
184.5Bright
194.5Bright
204.5Bright
214.4Bright
224.4Bright
234.4Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Is September a good time to visit Atlanta?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.2
Sightseeing
4th-best month of the year
7.1
Beach & pool
1st-best month of the year

September is a reasonable time to visit Atlanta for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Atlanta in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Atlanta sees daytime highs around 82°F and nights near 64°F. Pack light clothes. Worth having: rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in Atlanta in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Atlanta peaks around July 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 12UV 10Dec 19UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar5High
Apr7Very high
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep7Very high
Oct5High
Nov4Moderate
Dec3Moderate

Air quality in Atlanta in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Atlanta is worst in July — around 21 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (January, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 1620 µg/m³Jan 118 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar12Moderate
Apr12Good
May14Moderate
Jun17Moderate
Jul21Moderate
Aug17Moderate
Sep13Moderate
Oct10Good
Nov9Good
Dec8Good
Location & terrain

Where is Atlanta?

Atlanta sits at 33.7°N, 84.4°W, 1,050 ft above sea level, in United States. The nearest listed city is North Decatur, 5.6 mi away.

Topography around Atlanta

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Atlanta.

Within 2 miles, the terrain around Atlanta has only modest variations in elevation — a maximum elevation change of 230 ft around an average of 1,004 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 446 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,149 ft.

The land around Atlanta is covered by artificial surfaces (63%) and trees (31%) within 2 miles, trees (67%) and artificial surfaces (26%) within 10 miles, and trees (81%) within 50 miles.

2 miles
230 ft
10 miles
446 ft
50 miles
2,149 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: North Decatur 5.6 mi · Decatur 5.6 mi · East Point 5.6 mi · North Druid Hills 6.2 mi · Candler-McAfee 6.8 mi · Belvedere Park 6.8 mi · Brookhaven 8.1 mi · Forest Park 8.7 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Atlanta (33.749°, -84.388°, elevation 1,050 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).