Millbrook weather in September

In September, Millbrook sees average daytime highs of 87°F and overnight lows near 68°F, with 2.9 in of rain across 7.9 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 90°F in the first days to 83°F by the end. The sky is clear or mostly clear about 40% 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 Millbrook's 3rd-clearest and 9th-windiest month. For the whole year in context, see Millbrook's year-round climate.

Daytime high
87°
4th warmest
Overnight low
68°
9th coldest
Rainfall
2.9 in
7.9 wet days
Daylight
12 h 12 min
5:34 AM – 5:46 PM
Cloud cover
51%
3rd clearest
Wind
5 mph
9th windiest
Solar energy
4.85 kWh/m²
Travel score
5.0
out of 10

Millbrook is city in Autauga and Elmore counties, Alabama, United States of America.

Density
451/km²
people per km²
Founded
1979

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 90°F in the first days to 83°F by the end.

A typical September day in Millbrook reaches about 87°F in the afternoon and slips back to 68°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 79°F and 94°F. Set against its neighbours, September runs about 4°F cooler than August and about 10°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19071
29071
39071
48971
58971
68970
78970
88970
98970
108969
118869
128869
138869
148869
158768
168768
178768
188767
198667
208667
218666
228566
238566
248565
258465
268464
278464
288364
298363
308363

How September really feels in Millbrook

Once humidity and wind are folded in, September averages 13 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
13
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Millbrook weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan57° / 38°4.51010.14.1
Feb61° / 41°4.59.610.85.1
Mar69° / 47°4.69.711.86.5
Apr76° / 54°3.98.512.87.1
May83° / 63°3.18.913.66.0
Jun89° / 71°3.611.514.14.0
Jul91° / 74°3.914.413.93.2
Aug91° / 73°3.31313.23.4
Sep87° / 68°2.97.912.25.0
Oct77° / 56°2.96.711.27.5
Nov67° / 46°4.07.410.36.8
Dec59° / 40°4.610.19.94.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 41%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25842
35941
45941
56040
66040
76040
86040
96139
106139
116139
126139
136040
146040
155941
165941
175842
185842
195743
205743
215743
225842
235842
245842
255941
265941
275941
286040
296040
306040

Chance of precipitation in September

Any precipitation

Millbrook gets around 2.9 in of rain over 7.9 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 27% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
131
230
329
428
528
627
726
826
925
1025
1125
1225
1325
1425
1526
1626
1727
1827
1927
2028
2128
2228
2327
2427
2527
2626
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 31% of days. Sticky, muggy-or-worse air turns up on roughly 55% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1261536411
2261536391
3371536380
4381636370
5391636360
63101735340
74111835330
84121834320
94121933310
105132032300
115142031290
125152130280
135162230270
146162229260
156172329260
166172329250
177172329240
188172429230
199172429220
2010162429200
2111162429190
2213162428180
2315162328170
2416162328160
2518162328150
2620172327130
2721172227120
2823172226110
2924172226110
3025172225100

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
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 5:24 AM to 5:43 AM, and sunset from 6:06 PM to 5:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:246:06
212.75:256:05
312.65:256:04
412.65:266:02
512.65:276:01
612.55:276:00
712.55:285:58
812.55:295:57
912.45:295:55
1012.45:305:54
1112.45:315:53
1212.35:315:51
1312.35:325:50
1412.35:335:48
1512.25:335:47
1612.25:345:46
1712.25:355:44
1812.15:355:43
1912.15:365:41
2012.15:365:40
2112.05:375:39
2212.05:385:37
2312.05:385:36
2411.95:395:35
2511.95:405:33
2611.95:405:32
2711.85:415:30
2811.85:425:29
2911.85:435:28
3011.75:435:26

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.85 kWh/m².

For context, solar energy here swings from a low near 2.45 kWh/m² to a high of 6.27 kWh/m² in May across the year — September's 4.85 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.1Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
144.9Bright
154.9Bright
164.9Bright
174.8Bright
184.8Bright
194.8Bright
204.7Bright
214.7Bright
224.7Bright
234.6Bright
244.6Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.4Bright
304.4Bright
Planning a trip in September

Is September a good time to visit Millbrook?

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

5.0
Sightseeing
7th-best month of the year
7.1
Beach & pool
2nd-best month of the year

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

What to pack for Millbrook in September

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

In September, Millbrook sees daytime highs around 87°F and nights near 68°F. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

UV index in Millbrook in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Millbrook peaks around July 15 at about 10 (extreme) — 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 highVery highHighModerateJul 15UV 10Dec 19UV 3
UV index (midday)Level
Jan4Moderate
Feb5High
Mar7High
Apr8Very high
May9Very high
Jun9Very high
Jul10Extreme
Aug9Very high
Sep8Very high
Oct5High
Nov4Moderate
Dec3Moderate

Air quality in Millbrook 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 Millbrook is worst in July — around 20 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (January, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1820 µg/m³Jan 146 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar10Good
Apr10Good
May12Good
Jun16Moderate
Jul20Moderate
Aug18Moderate
Sep14Moderate
Oct11Good
Nov8Good
Dec7Good
Location & terrain

Where is Millbrook?

Millbrook sits at 32.5°N, 86.4°W, 190 ft above sea level, in United States. The nearest listed city is Prattville, 5.6 mi away.

Topography around Millbrook

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

Within 2 miles, the terrain around Millbrook has only modest variations in elevation — a maximum elevation change of 289 ft around an average of 217 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 554 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,434 ft.

The land around Millbrook is covered by trees (69%) and grassland (22%) within 2 miles, trees (61%) and grassland (24%) within 10 miles, and trees (82%) within 50 miles.

2 miles
289 ft
10 miles
554 ft
50 miles
1,434 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Prattville 5.6 mi · Montgomery 8.7 mi · Selma 39 mi · Troy 52 mi · Auburn 52 mi · Opelika 58 mi · Alabaster 59 mi · Pelham 62 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 Millbrook (32.4799°, -86.3619°, elevation 190 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).