South Houston weather in September

In September, South Houston sees average daytime highs of 88°F and overnight lows near 71°F, with 4.6 in of rain across 11.8 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 90°F in the first days to 86°F by the end. The sky is clear or mostly clear about 44% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is South Houston's 2nd-clearest and 10th-windiest month. For the whole year in context, see South Houston's year-round climate.

Daytime high
88°
4th warmest
Overnight low
71°
9th coldest
Rainfall
4.6 in
11.8 wet days
Daylight
12 h 12 min
6:10 AM – 6:21 PM
Cloud cover
49%
2nd clearest
Wind
6 mph
10th windiest
Solar energy
4.98 kWh/m²
Travel score
4.4
out of 10

South Houston is city in Harris County, Texas, United States.

Density
2,219/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 90°F in the first days to 86°F by the end.

A typical September day in South Houston reaches about 88°F in the afternoon and slips back to 71°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 82°F and 93°F. Set against its neighbours, September runs about 4°F cooler than August and about 7°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19074
29074
39074
49074
59073
69073
78973
88973
98973
108973
118973
128972
138972
148872
158872
168871
178871
188871
198771
208770
218770
228770
238769
248669
258669
268668
278668
288667
298567
308567

How September really feels in South Houston

Once humidity and wind are folded in, September averages 23 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
23
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.

South Houston weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan63° / 45°4.21010.35.6
Feb66° / 49°3.3910.96.1
Mar72° / 55°3.79.211.86.8
Apr78° / 61°3.88.912.76.9
May85° / 69°3.59.813.55.5
Jun89° / 74°4.512.813.93.8
Jul91° / 76°3.612.713.73.3
Aug92° / 75°3.913.313.13.2
Sep88° / 71°4.611.812.24.4
Oct81° / 62°4.18.711.36.8
Nov71° / 53°4.18.310.57.0
Dec65° / 47°4.29.610.15.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% 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 39%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25545
35545
45644
55644
65644
75743
85743
95743
105743
115743
125743
135743
145842
155842
165941
176040
186139
196238
206337
216436
226634
236733
246832
256931
267030
277129
287129
297129
307228

Chance of precipitation in September

Any precipitation

South Houston gets around 4.6 in of rain over 11.8 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 39% and peaks near 46% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
145
245
345
446
546
646
745
845
945
1045
1144
1244
1343
1443
1542
1641
1740
1839
1938
2037
2135
2234
2333
2432
2531
2630
2730
2829
2929
3028

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 47% of days. Sticky, muggy-or-worse air turns up on roughly 81% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1016135723
2116135722
3127145521
4127145620
5127155619
6127165618
7127165618
8137175517
9137175517
10237175417
11247185317
12247185217
13247195216
14347195116
15347204916
16358204816
17458204716
18558214615
19659214415
20769214214
218610224114
229710223913
2310711223812
2411811223612
2512811223511
2613912233410
271491223339
281591223338
2916101223327
3017101223316

Wind in September

Winds average 6 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 36 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 54 minutes over September. Sunrise moves from 6:02 AM to 6:18 AM, and sunset from 6:39 PM to 6:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:026:39
212.66:026:38
312.66:036:37
412.56:036:36
512.56:046:35
612.56:056:33
712.46:056:32
812.46:066:31
912.46:066:30
1012.46:076:28
1112.36:076:27
1212.36:086:26
1312.36:086:24
1412.26:096:23
1512.26:096:22
1612.26:106:21
1712.16:116:19
1812.16:116:18
1912.16:126:17
2012.16:126:15
2112.06:136:14
2212.06:136:13
2312.06:146:12
2411.96:146:10
2511.96:156:09
2611.96:166:08
2711.86:166:06
2811.86:176:05
2911.86:176:04
3011.76:186:03

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.98 kWh/m².

For context, solar energy here swings from a low near 2.6 kWh/m² to a high of 6.21 kWh/m² in July across the year — September's 4.98 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.1Bright
75.1Bright
85.1Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
144.9Bright
154.9Bright
164.9Bright
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

Hazard calendar for South Houston

In seasonPeak

In September, South Houston sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

South Houston sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit South Houston?

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

4.4
Sightseeing
9th-best month of the year
6.5
Beach & pool
4th-best month of the year

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

What to pack for South Houston in September

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

In September, South Houston sees daytime highs around 88°F and nights near 71°F. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

Sea temperature near South Houston in September

The nearest coast averages about 84°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 38 mi away) is warmest in August at about 86°F and coldest in January near 59°F.

It's comfortable for a long swim from Apr 3 to Nov 25 — about 7.8 months when the water holds above 68°F.

60°70°80°90°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan59Cool
Feb60Cool
Mar64Cool
Apr71Refreshing
May78Warm
Jun83Tropical
Jul85Tropical
Aug86Tropical
Sep84Tropical
Oct78Warm
Nov70Refreshing
Dec63Cool

UV index in South Houston in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in South Houston peaks around July 20 at about 11 (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 20UV 11Dec 21UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar6High
Apr10Very high
May10Extreme
Jun10Extreme
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov5Moderate
Dec4Moderate

Air quality in South Houston 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 South Houston is worst in July — around 24 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1523 µg/m³Dec 2010 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb10Good
Mar12Moderate
Apr12Moderate
May16Moderate
Jun20Moderate
Jul24Moderate
Aug18Moderate
Sep15Moderate
Oct11Good
Nov10Good
Dec10Good
Location & terrain

Where is South Houston?

South Houston sits at 29.7°N, 95.2°W, 30 ft above sea level, in United States. The nearest listed city is Pasadena, 2.5 mi away.

Topography around South Houston

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

Within 2 miles, the terrain around South Houston has only modest variations in elevation — a maximum elevation change of 56 ft around an average of 36 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 200 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 348 ft.

The land around South Houston is covered by artificial surfaces (51%) and trees (38%) within 2 miles, artificial surfaces (39%) and trees (38%) within 10 miles, and trees (38%) and grassland (24%) within 50 miles.

2 miles
56 ft
10 miles
200 ft
50 miles
348 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Pasadena 2.5 mi · Deer Park 7.5 mi · Pearland 7.5 mi · Cloverleaf 8.7 mi · Friendswood 9.3 mi · Houston 11 mi · Channelview 11 mi · West University Place 12 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 South Houston (29.663°, -95.2355°, elevation 30 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).