Huntsville weather in September

In September, Huntsville sees average daytime highs of 83°F and overnight lows near 64°F, with 3.6 in of rain across 7.5 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 86°F in the first days to 79°F by the end. The sky is clear or mostly clear about 42% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Huntsville's 2nd-clearest and 9th-windiest month. For the whole year in context, see Huntsville's year-round climate.

Daytime high
83°
4th warmest
Overnight low
64°
9th coldest
Rainfall
3.6 in
7.5 wet days
Daylight
12 h 12 min
5:34 AM – 5:47 PM
Cloud cover
50%
2nd clearest
Wind
5 mph
9th windiest
Solar energy
4.76 kWh/m²
Travel score
6.3
out of 10

Huntsville is county seat of Madison County, Alabama, United States.

Density
387/km²
people per km²
Founded
1805

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 Huntsville reaches about 83°F in the afternoon and slips back to 64°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 74°F and 91°F. Set against its neighbours, September runs about 5°F cooler than August and about 10°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18668
28668
38667
48667
58567
68567
78566
88566
98566
108465
118465
128465
138465
148364
158364
168364
178263
188263
198262
208262
218162
228161
238061
248060
258060
267960
277959
287959
297858
307858

How September really feels in Huntsville

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.

Huntsville 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
Jan50° / 33°5.110.30.79.92.2
Feb54° / 36°4.9110.910.73.2
Mar62° / 43°5.711.80.311.75.2
Apr71° / 51°4.910.4012.86.5
May78° / 60°4.211.1013.86.5
Jun85° / 68°4.112.5014.34.9
Jul88° / 71°4.412.9014.14.2
Aug87° / 70°3.111.1013.34.5
Sep83° / 64°3.67.5012.26.3
Oct72° / 52°3.47.2011.17.3
Nov61° / 42°4.29010.25.2
Dec53° / 36°5.511.20.39.72.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% 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 40%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25842
35842
45941
56040
66139
76139
86139
96139
106139
116139
126139
136139
146139
156040
165941
175941
185842
195842
205842
215842
225941
235941
245941
256139
266139
276238
286337
296436
306436

Chance of precipitation in September

Any precipitation

Huntsville gets around 3.6 in of rain over 7.5 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 25% and peaks near 28% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
327
426
526
625
725
824
924
1023
1123
1223
1324
1424
1525
1626
1726
1827
1927
2027
2127
2227
2327
2426
2525
2625
2724
2824
2923
3023

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 29% of days. Sticky, muggy-or-worse air turns up on roughly 39% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
138244223
239254121
3410264120
4411264018
5513273916
6614283815
7615283713
8716293612
9817293511
10818293410
11919293310
12102029329
13112128319
14112228308
15122228308
16132327298
17142327288
18152327278
19172327267
20182327257
21202227247
22222226236
23242226226
24262126215
25292125205
26312125195
27332124184
28352024184
29362023173
30382023163

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 4 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
14calm
24calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 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 66 minutes over September. Sunrise moves from 5:23 AM to 5:45 AM, and sunset from 6:09 PM to 5:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:236:09
212.75:246:08
312.75:256:06
412.75:256:05
512.65:266:03
612.65:276:02
712.55:286:00
812.55:285:59
912.55:295:57
1012.45:305:56
1112.45:315:55
1212.45:315:53
1312.35:325:52
1412.35:335:50
1512.35:335:49
1612.25:345:47
1712.25:355:46
1812.15:365:44
1912.15:365:43
2012.15:375:41
2112.05:385:40
2212.05:395:38
2312.05:395:37
2411.95:405:35
2511.95:415:34
2611.85:425:32
2711.85:435:31
2811.85:435:29
2911.75:445:28
3011.75:455:26

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.76 kWh/m².

For context, solar energy here swings from a low near 2.16 kWh/m² to a high of 6.16 kWh/m² in June across the year — September's 4.76 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
114.9Bright
124.9Bright
134.9Bright
144.8Bright
154.8Bright
164.8Bright
174.7Bright
184.7Bright
194.6Bright
204.6Bright
214.6Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.4Bright
274.4Bright
284.4Bright
294.4Bright
304.3Bright
Planning a trip in September

Is September a good time to visit Huntsville?

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
7.2
Beach & pool
1st-best month of the year

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

What to pack for Huntsville in September

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

In September, Huntsville sees daytime highs around 83°F and nights near 64°F. Pack light clothes. Worth having: sun protection. About 8 days see rain.

light clothessun protection

UV index in Huntsville 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 Huntsville peaks around July 11 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 11UV 10Dec 19UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep7Very high
Oct5High
Nov4Moderate
Dec2Moderate

Air quality in Huntsville 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 Huntsville is worst in July — around 19 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (January, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1619 µg/m³Jan 116 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar9Good
Apr10Good
May13Moderate
Jun16Moderate
Jul19Moderate
Aug15Moderate
Sep11Good
Oct8Good
Nov7Good
Dec6Good
Location & terrain

Where is Huntsville?

Huntsville sits at 34.7°N, 86.6°W, 633 ft above sea level, in United States. The nearest listed city is Madison, 9.3 mi away.

Topography around Huntsville

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

Within 2 miles, the terrain around Huntsville has only modest variations in elevation — a maximum elevation change of 459 ft around an average of 669 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,165 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,555 ft.

The land around Huntsville is covered by trees (42%) and artificial surfaces (42%) within 2 miles, trees (53%) and grassland (23%) within 10 miles, and trees (59%) and grassland (26%) within 50 miles.

2 miles
459 ft
10 miles
1,165 ft
50 miles
1,555 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Madison 9.3 mi · Athens 22 mi · Decatur 24 mi · Albertville 39 mi · Cullman 41 mi · Tullahoma 48 mi · Shelbyville 53 mi · Gadsden 60 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 Huntsville (34.7304°, -86.5859°, elevation 633 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).