Acworth weather in September

In September, Acworth sees average daytime highs of 82°F and overnight lows near 64°F, with 3.6 in of rain across 8.9 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 78°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 Acworth's 3rd-clearest and 9th-windiest month. For the whole year in context, see Acworth's year-round climate.

Daytime high
82°
4th warmest
Overnight low
64°
9th coldest
Rainfall
3.6 in
8.9 wet days
Daylight
12 h 12 min
6:27 AM – 6:39 PM
Cloud cover
53%
3rd clearest
Wind
5 mph
9th windiest
Solar energy
4.62 kWh/m²
Travel score
6.3
out of 10

Acworth is city in Cobb County, Georgia, United States.

Density
974/km²
people per km²
Founded
1840

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 78°F by the end.

A typical September day in Acworth 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 74°F and 89°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)
18568
28567
38567
48567
58467
68467
78466
88466
98466
108365
118365
128365
138365
148264
158264
168264
178264
188163
198163
208162
218062
228062
238061
247961
257961
267960
277860
287860
297859
307759

How September really feels in Acworth

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.

Acworth 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
Jan52° / 35°4.410.20.7102.7
Feb56° / 37°4.4100.510.73.7
Mar64° / 44°4.710.40.111.75.6
Apr72° / 51°4.19.8012.86.7
May79° / 60°3.510.4013.76.6
Jun85° / 68°4.013.7014.24.8
Jul88° / 71°4.514.80144.1
Aug87° / 70°3.913.1013.34.5
Sep82° / 64°3.68.9012.26.3
Oct72° / 52°3.27.1011.17.3
Nov62° / 42°3.98.2010.25.6
Dec54° / 37°4.410.40.39.83.3

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 43%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15248
25347
35347
45446
55446
65545
75644
85644
95743
105842
115842
125941
135842
145842
155842
165743
175743
185743
195644
205644
215644
225743
235743
245743
255842
265842
275842
285941
296040
306040

Chance of precipitation in September

Any precipitation

Acworth gets around 3.6 in of rain over 8.9 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 30% and peaks near 35% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
135
235
334
433
532
631
730
829
928
1027
1127
1227
1327
1428
1528
1628
1729
1829
1930
2030
2130
2230
2330
2430
2530
2629
2728
2828
2927
3026

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 42% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
129224225
2310224224
3311234122
4412244021
5412253919
6513263818
7614273717
8615273615
9716283514
10816283413
11917283312
121017293211
131118293211
141218293110
151318293010
16141829309
17151928299
18161928289
19181928278
20191928278
21201927267
22221927267
23241926256
24251925246
25271925245
26291924235
27301924224
28321924214
29331923214
30352023203

Wind in September

Winds average 5 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
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
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 6:16 AM to 6:37 AM, and sunset from 7:01 PM to 6:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:167:01
212.76:176:59
312.76:176:58
412.66:186:57
512.66:196:55
612.66:206:54
712.56:206:52
812.56:216:51
912.56:226:49
1012.46:226:48
1112.46:236:47
1212.46:246:45
1312.36:256:44
1412.36:256:42
1512.26:266:41
1612.26:276:39
1712.26:276:38
1812.16:286:36
1912.16:296:35
2012.16:306:33
2112.06:306:32
2212.06:316:31
2312.06:326:29
2411.96:336:28
2511.96:336:26
2611.86:346:25
2711.86:356:23
2811.86:366:22
2911.76:366:20
3011.76:376:19

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 2.27 kWh/m² to a high of 6.04 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
64.9Bright
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
284.3Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Acworth

In seasonPeak

In September, Acworth sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Acworth sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Acworth?

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

6.3
Sightseeing
4th-best month of the year
6.9
Beach & pool
1st-best month of the year

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

What to pack for Acworth in September

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

In September, Acworth sees daytime highs around 82°F and nights near 64°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Acworth 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 Acworth peaks around July 11 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 11UV 10Dec 20UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7Very high
May8Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep7Very high
Oct5High
Nov4Moderate
Dec3Moderate

Air quality in Acworth 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 Acworth 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 Acworth?

Acworth sits at 34.1°N, 84.7°W, 909 ft above sea level, in United States. The nearest listed city is Kennesaw, 5.0 mi away.

Topography around Acworth

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

Within 2 miles, the terrain around Acworth has only modest variations in elevation — a maximum elevation change of 184 ft around an average of 909 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,247 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,484 ft.

The land around Acworth is covered by trees (61%) within 2 miles, trees (75%) within 10 miles, and trees (82%) within 50 miles.

2 miles
184 ft
10 miles
1,247 ft
50 miles
3,484 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Kennesaw 5.0 mi · Woodstock 9.3 mi · Cartersville 9.9 mi · Marietta 11 mi · Smyrna 16 mi · Canton 16 mi · Mableton 18 mi · Roswell 19 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 Acworth (34.0663°, -84.6784°, elevation 909 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).