Huntsville weather in September

In September, Huntsville sees average daytime highs of 89°F and overnight lows near 70°F, with 3.3 in of rain across 8.3 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 92°F in the first days to 86°F by the end. The sky is clear or mostly clear about 49% of the time in September, and the air most often feels oppressive.

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 Huntsville's 2nd-clearest and 11th-windiest month. For the whole year in context, see Huntsville's year-round climate.

Daytime high
89°
4th warmest
Overnight low
70°
9th coldest
Rainfall
3.3 in
8.3 wet days
Daylight
12 h 12 min
6:11 AM – 6:22 PM
Cloud cover
46%
2nd clearest
Wind
5 mph
11th windiest
Solar energy
5.01 kWh/m²
Travel score
4.5
out of 10

Huntsville is city in and county seat of Walker County, Texas, United States.

Density
435/km²
people per km²
Founded
1836

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 92°F in the first days to 86°F by the end.

A typical September day in Huntsville reaches about 89°F in the afternoon and slips back to 70°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 81°F and 95°F. Set against its neighbours, September runs about 5°F cooler than August and about 9°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19273
29273
39273
49173
59173
69172
79172
89172
99072
109072
119071
129071
139071
148971
158970
168970
178970
188870
198869
208869
218869
228768
238768
248767
258767
268667
278666
288666
298665
308565

How September really feels in Huntsville

Once humidity and wind are folded in, September averages 21 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
21
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.

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 daysDaylight (hours)Travel score
Jan60° / 42°3.99.210.25.0
Feb64° / 46°3.48.710.95.8
Mar71° / 52°3.79.511.86.7
Apr78° / 59°4.28.812.77.0
May85° / 67°4.310.613.55.3
Jun91° / 73°3.911.613.93.6
Jul94° / 75°2.89.613.83.0
Aug94° / 75°2.99.613.12.9
Sep89° / 70°3.38.312.24.5
Oct80° / 60°4.47.911.27.0
Nov69° / 50°3.78.310.46.8
Dec62° / 44°4.29.6105.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 36%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
26040
36040
46040
56139
66139
76139
86139
96238
106238
116238
126238
136238
146238
156238
166337
176337
186337
196436
206535
216535
226733
236832
246931
257030
267129
277129
287228
297228
307228

Chance of precipitation in September

Any precipitation

Huntsville gets around 3.3 in of rain over 8.3 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 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
335
434
534
633
733
832
932
1031
1131
1230
1330
1430
1529
1629
1728
1827
1927
2026
2125
2224
2324
2423
2522
2622
2722
2821
2921
3021

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the oppressive band about 41% of days. Sticky, muggy-or-worse air turns up on roughly 70% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
124923575
2241022575
3241122565
4351122554
5351223534
6351223534
7451223524
8451223524
9461223514
10461224504
11571224494
12571224474
13581225465
14581225455
15691226435
16691226425
177101226405
187101326385
198101326375
2010111426355
2111111425335
2212111525325
2314121524305
2415121624295
2516121623284
2618121623274
2719121723263
2820121723253
2921121723243
3022121723232

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
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 6:02 AM to 6:19 AM, and sunset from 6:42 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:026:42
212.66:036:40
312.66:036:39
412.66:046:38
512.56:056:36
612.56:056:35
712.56:066:34
812.46:066:33
912.46:076:31
1012.46:086:30
1112.36:086:29
1212.36:096:27
1312.36:096:26
1412.26:106:25
1512.26:106:23
1612.26:116:22
1712.26:126:21
1812.16:126:19
1912.16:136:18
2012.16:136:17
2112.06:146:15
2212.06:156:14
2312.06:156:13
2411.96:166:11
2511.96:166:10
2611.96:176:09
2711.86:186:07
2811.86:186:06
2911.86:196:05
3011.76:196:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.01 kWh/m².

For context, solar energy here swings from a low near 2.53 kWh/m² to a high of 6.35 kWh/m² in July across the year — September's 5.01 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.2Bright
65.2Bright
75.2Bright
85.1Bright
95.1Bright
105.1Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
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).

4.5
Sightseeing
9th-best month of the year
6.9
Beach & pool
2nd-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 89°F and nights near 70°F. Pack light clothes. Worth having: rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in Huntsville 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 Huntsville peaks around July 24 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 4 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 24UV 10Dec 21UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar7High
Apr9Very high
May10Extreme
Jun10Extreme
Jul10Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov5Moderate
Dec4Moderate

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 23 µg/m³ PM2.5 (moderate), about 3.1× the cleanest month (December, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1622 µg/m³Dec 227 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb8Good
Mar12Moderate
Apr11Good
May14Moderate
Jun18Moderate
Jul23Moderate
Aug17Moderate
Sep15Moderate
Oct11Good
Nov10Good
Dec7Good
Location & terrain

Where is Huntsville?

Huntsville sits at 30.7°N, 95.6°W, 371 ft above sea level, in United States. The nearest listed city is Conroe, 29 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 259 ft around an average of 397 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 377 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 571 ft.

The land around Huntsville is covered by trees (49%), grassland (26%) and artificial surfaces (23%) within 2 miles, trees (71%) and grassland (26%) within 10 miles, and trees (63%) and grassland (31%) within 50 miles.

2 miles
259 ft
10 miles
377 ft
50 miles
571 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Conroe 29 mi · The Woodlands 39 mi · New Caney 44 mi · Spring 45 mi · College Station 47 mi · Bryan 49 mi · Cypress 53 mi · Humble 53 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 (30.7235°, -95.5508°, elevation 371 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).