McDonough weather in September

In September, McDonough sees average daytime highs of 83°F and overnight lows near 65°F, with 3.6 in of rain across 8.6 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 86°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 McDonough's 3rd-clearest and 9th-windiest month. For the whole year in context, see McDonough's year-round climate.

Daytime high
83°
4th warmest
Overnight low
65°
9th coldest
Rainfall
3.6 in
8.6 wet days
Daylight
12 h 12 min
6:25 AM – 6:37 PM
Cloud cover
53%
3rd clearest
Wind
5 mph
9th windiest
Solar energy
4.64 kWh/m²
Travel score
6.1
out of 10

McDonough is city in and the county seat of Henry County, Georgia, United States.

Density
706/km²
people per km²

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 86°F in the first days to 79°F by the end.

A typical September day in McDonough reaches about 83°F in the afternoon and slips back to 65°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)
18669
28669
38668
48668
58568
68568
78567
88567
98567
108567
118466
128466
138466
148465
158365
168365
178365
188364
198264
208264
218264
228163
238163
248162
258062
268062
278061
287961
297960
307960

How September really feels in McDonough

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.

McDonough weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan54° / 36°4.010.10.6103.3
Feb58° / 39°4.39.50.310.84.3
Mar65° / 45°4.39.90.111.76.0
Apr73° / 52°3.18.8012.87.0
May81° / 61°2.99.5013.76.4
Jun87° / 69°3.813.9014.24.4
Jul89° / 72°4.015.30143.7
Aug88° / 71°3.813013.24.1
Sep83° / 65°3.68.6012.26.1
Oct74° / 53°2.96.6011.27.5
Nov64° / 43°3.68.2010.36.1
Dec56° / 38°4.29.70.29.83.8

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 (%)
15446
25545
35644
45743
55743
65743
75842
85941
96040
106040
116040
126040
136040
145941
155842
165743
175743
185644
195644
205545
215545
225545
235545
245545
255545
265644
275644
285644
295644
305644

Chance of precipitation in September

Any precipitation

McDonough gets around 3.6 in of rain over 8.6 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 28% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
133
232
332
431
530
629
728
827
927
1026
1126
1226
1326
1426
1526
1627
1727
1828
1928
2028
2129
2229
2329
2429
2528
2628
2728
2827
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 32% of days. Sticky, muggy-or-worse air turns up on roughly 45% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
138204226
248214225
359224223
459224122
5610234121
6611244020
7711243918
8812253817
9913253716
101014253615
111014263514
121115263514
131215263413
141316263313
151316263212
161417263112
171517263112
181517263011
191618262911
201718262911
211818262810
221918262710
23211925269
24221925269
25231924258
26252024247
27262024237
28282023226
29292123226
30302123215

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
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 6:14 AM to 6:35 AM, and sunset from 6:58 PM to 6:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:146:58
212.76:156:57
312.76:166:55
412.66:176:54
512.66:176:53
612.66:186:51
712.56:196:50
812.56:196:48
912.56:206:47
1012.46:216:46
1112.46:216:44
1212.36:226:43
1312.36:236:41
1412.36:236:40
1512.26:246:38
1612.26:256:37
1712.26:256:36
1812.16:266:34
1912.16:276:33
2012.16:286:31
2112.06:286:30
2212.06:296:28
2312.06:306:27
2411.96:306:26
2511.96:316:24
2611.86:326:23
2711.86:336:21
2811.86:336:20
2911.76:346:19
3011.76:356:17

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.64 kWh/m².

For context, solar energy here swings from a low near 2.36 kWh/m² to a high of 6.12 kWh/m² in May across the year — September's 4.64 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
104.9Bright
114.8Bright
124.8Bright
134.8Bright
144.7Bright
154.7Bright
164.6Bright
174.6Bright
184.6Bright
194.5Bright
204.5Bright
214.5Bright
224.4Bright
234.4Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.2Bright
304.2Bright
Planning a trip in September

Is September a good time to visit McDonough?

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

6.1
Sightseeing
4th-best month of the year
7.1
Beach & pool
1st-best month of the year

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

What to pack for McDonough in September

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

In September, McDonough sees daytime highs around 83°F and nights near 65°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in McDonough 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 McDonough peaks around June 23 at about 9 (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 highHighModerateJun 23UV 9Dec 19UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug9Very high
Sep7Very high
Oct5High
Nov4Moderate
Dec3Moderate

Air quality in McDonough 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 McDonough is worst in July — around 21 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (January, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1621 µg/m³Jan 118 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb11Good
Mar13Moderate
Apr12Moderate
May15Moderate
Jun18Moderate
Jul21Moderate
Aug18Moderate
Sep13Moderate
Oct11Good
Nov10Good
Dec8Good
Location & terrain

Where is McDonough?

McDonough sits at 33.4°N, 84.1°W, 866 ft above sea level, in United States. The nearest listed city is Stockbridge, 8.1 mi away.

Topography around McDonough

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

Within 2 miles, the terrain around McDonough has only modest variations in elevation — a maximum elevation change of 207 ft around an average of 823 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 489 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,490 ft.

The land around McDonough is covered by trees (56%) and artificial surfaces (22%) within 2 miles, trees (68%) and grassland (21%) within 10 miles, and trees (82%) within 50 miles.

2 miles
207 ft
10 miles
489 ft
50 miles
1,490 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Stockbridge 8.1 mi · Griffin 16 mi · Conyers 17 mi · Forest Park 17 mi · Riverdale 17 mi · Fayetteville 18 mi · Stonecrest 18 mi · Candler-McAfee 21 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 McDonough (33.4473°, -84.1469°, elevation 866 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).