Milton weather in September

In September, Milton sees average daytime highs of 81°F and overnight lows near 63°F, with 3.6 in of rain across 8.1 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 12th-wettest month of the year here.

Highs ease over the month, from about 84°F in the first days to 77°F by the end. The sky is clear or mostly clear about 39% 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 Milton's 3rd-clearest and 9th-windiest month. For the whole year in context, see Milton's year-round climate.

Daytime high
81°
4th warmest
Overnight low
63°
9th coldest
Rainfall
3.6 in
8.1 wet days
Daylight
12 h 12 min
6:25 AM – 6:38 PM
Cloud cover
53%
3rd clearest
Wind
5 mph
9th windiest
Solar energy
4.59 kWh/m²
Travel score
6.7
out of 10

Milton is city in Fulton County, Georgia, United States.

Density
370/km²
people per km²
Founded
2006

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 84°F in the first days to 77°F by the end.

A typical September day in Milton reaches about 81°F in the afternoon and slips back to 63°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 73°F and 88°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)
18467
28467
38467
48367
58366
68366
78366
88365
98365
108265
118265
128264
138264
148264
158164
168163
178163
188063
198062
208062
217962
227961
237961
247861
257860
267860
277759
287759
297759
307658

How September really feels in Milton

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.

Milton weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan51° / 34°5.2110.8102.4
Feb55° / 37°5.010.50.910.73.3
Mar62° / 43°5.210.80.111.75.3
Apr70° / 51°4.510012.86.6
May78° / 59°3.710013.86.8
Jun84° / 67°4.113.6014.25.2
Jul87° / 70°4.214.20144.4
Aug86° / 69°4.212.7013.34.8
Sep81° / 63°3.68.1012.26.7
Oct71° / 52°3.67.4011.17.2
Nov61° / 42°4.38.7010.25.3
Dec53° / 36°5.210.70.49.83.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% 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 (%)
15545
25545
35545
45644
55644
65644
75743
85743
95842
105842
115842
125842
135941
145842
155842
165842
175743
185743
195644
205644
215644
225743
235743
245842
255842
265842
275941
285941
295941
305842

Chance of precipitation in September

Any precipitation

Milton gets around 3.6 in of rain over 8.1 wet days in September, the driest month. 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
727
826
925
1025
1125
1225
1325
1425
1525
1626
1726
1827
1927
2028
2128
2228
2328
2428
2527
2627
2726
2826
2926
3025

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 37% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
139254518
2310264417
3411274316
4411284215
5513284014
6614293813
7715303712
8716303511
9817313410
1091831339
11101831328
12111931318
13122030307
14132030297
15142130297
16152130286
17162229276
18172229266
19182229266
20192228255
21212228255
22222227244
23242226244
24262226233
25282225223
26292224213
27312324202
28332323192
29352223182
30362222172

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
245calm
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 6:36 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)
112.76:146:59
212.76:156:58
312.76:166:57
412.66:176:55
512.66:176:54
612.66:186:52
712.56:196:51
812.56:206:49
912.56:206:48
1012.46:216:47
1112.46:226:45
1212.46:226:44
1312.36:236:42
1412.36:246:41
1512.26:256:39
1612.26:256:38
1712.26:266:36
1812.16:276:35
1912.16:276:33
2012.16:286:32
2112.06:296:30
2212.06:306:29
2312.06:306:28
2411.96:316:26
2511.96:326:25
2611.86:336:23
2711.86:336:22
2811.86:346:20
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 4.59 kWh/m².

For context, solar energy here swings from a low near 2.26 kWh/m² to a high of 6.04 kWh/m² in June across the year — September's 4.59 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.7Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.5Bright
204.4Bright
214.4Bright
224.4Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Is September a good time to visit Milton?

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

6.7
Sightseeing
3rd-best month of the year
6.9
Beach & pool
1st-best month of the year

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

What to pack for Milton in September

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

In September, Milton sees daytime highs around 81°F and nights near 63°F. Pack light clothes. Worth having: rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in Milton 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 Milton peaks around July 10 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 10UV 10Dec 20UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep7Very high
Oct5High
Nov4Moderate
Dec3Moderate

Air quality in Milton 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 Milton is worst in July — around 19 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (January, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1618 µg/m³Jan 106 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar11Good
Apr12Good
May13Moderate
Jun16Moderate
Jul19Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec6Good
Location & terrain

Where is Milton?

Milton sits at 34.1°N, 84.3°W, 981 ft above sea level, in United States. The nearest listed city is Alpharetta, 3.7 mi away.

Topography around Milton

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

Within 2 miles, the terrain around Milton has only modest variations in elevation — a maximum elevation change of 295 ft around an average of 1,073 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 846 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,885 ft.

The land around Milton is covered by trees (78%) within 2 miles, trees (71%) within 10 miles, and trees (83%) within 50 miles.

2 miles
295 ft
10 miles
846 ft
50 miles
3,885 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Alpharetta 3.7 mi · Roswell 8.1 mi · Johns Creek 9.3 mi · Peachtree Corners 12 mi · Duluth 12 mi · Woodstock 12 mi · Dunwoody 13 mi · Canton 13 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 Milton (34.1322°, -84.3007°, elevation 981 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).