Alief weather in September

In September, Alief sees average daytime highs of 88°F and overnight lows near 71°F, with 4.3 in of rain across 11.5 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 91°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 Alief's 2nd-clearest and 10th-windiest month. For the whole year in context, see Alief's year-round climate.

Daytime high
88°
4th warmest
Overnight low
71°
9th coldest
Rainfall
4.3 in
11.5 wet days
Daylight
12 h 12 min
6:11 AM – 6:22 PM
Cloud cover
49%
2nd clearest
Wind
6 mph
10th windiest
Solar energy
5.01 kWh/m²
Travel score
4.3
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 91°F in the first days to 86°F by the end.

A typical September day in Alief 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 94°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)
19174
29174
39174
49074
59073
69073
79073
89073
98973
108973
118973
128972
138972
148972
158972
168871
178871
188871
198871
208770
218770
228770
238769
248769
258769
268668
278668
288667
298667
308567

How September really feels in Alief

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.

Alief weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan63° / 45°3.91010.35.6
Feb67° / 48°3.18.810.96.2
Mar73° / 55°3.49.311.86.8
Apr79° / 61°3.78.712.76.9
May85° / 68°3.59.813.55.3
Jun90° / 74°4.312.513.93.7
Jul92° / 76°3.312.213.73.2
Aug92° / 75°3.612.213.13.1
Sep88° / 71°4.311.512.24.3
Oct81° / 62°4.08.811.36.7
Nov72° / 53°3.98.710.57.0
Dec65° / 47°4.19.310.16.0

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 17% of September, with mostly cloudy or overcast conditions the remaining 38%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25644
35743
45644
55644
65743
75743
85743
95743
105842
115842
125941
135941
145941
155941
166040
176040
186139
196238
206337
216436
226535
236634
246832
256931
267030
277030
287129
297228
307228

Chance of precipitation in September

Any precipitation

Alief gets around 4.3 in of rain over 11.5 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 38% 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
445
546
645
745
845
944
1044
1143
1243
1342
1441
1541
1640
1739
1837
1936
2035
2134
2233
2332
2431
2530
2629
2728
2828
2927
3027

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 48% of days. Sticky, muggy-or-worse air turns up on roughly 79% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1126146116
2127146016
3127156015
4127156114
5127166014
6227175913
7237175813
8237175912
9237185812
10237185812
11347195512
12347195512
13347195413
14358205113
15358205113
16458214913
17469214812
18569214612
19679214412
207710224312
218810224111
229810223911
2310911223810
2412911223610
2513101122359
2614101223348
2715101223338
2816101223327
2917111223316
3018111223306

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 6:03 AM to 6:19 AM, and sunset from 6:41 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:036:41
212.66:046:40
312.66:046:39
412.56:056:37
512.56:056:36
612.56:066:35
712.46:076:34
812.46:076:32
912.46:086:31
1012.46:086:30
1112.36:096:28
1212.36:096:27
1312.36:106:26
1412.26:106:25
1512.26:116:23
1612.26:116:22
1712.16:126:21
1812.16:136:19
1912.16:136:18
2012.16:146:17
2112.06:146:16
2212.06:156:14
2312.06:156:13
2411.96:166:12
2511.96:166:10
2611.96:176:09
2711.86:186:08
2811.86:186:07
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 2.61 kWh/m² to a high of 6.26 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
45.2Bright
55.2Bright
65.2Bright
75.1Bright
85.1Bright
95.1Bright
105.1Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
294.8Bright
304.8Bright
Planning a trip in September

Is September a good time to visit Alief?

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

4.3
Sightseeing
9th-best month of the year
6.5
Beach & pool
4th-best month of the year

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

What to pack for Alief in September

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

In September, Alief 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

UV index in Alief 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 Alief peaks around August 10 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 highHighModerateAug 10UV 11Dec 21UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar6High
Apr10Very high
May10Extreme
Jun10Extreme
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov5Moderate
Dec4Moderate

Air quality in Alief 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 Alief 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 Alief?

Alief sits at 29.7°N, 95.6°W, 75 ft above sea level, in United States. The nearest listed city is Mission Bend, 4.3 mi away.

Topography around Alief

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

Within 2 miles, the terrain around Alief has only modest variations in elevation — a maximum elevation change of 62 ft around an average of 79 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 151 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 476 ft.

The land around Alief is covered by artificial surfaces (58%) and trees (26%) within 2 miles, trees (46%) and artificial surfaces (38%) within 10 miles, and trees (40%) and grassland (32%) within 50 miles.

2 miles
62 ft
10 miles
151 ft
50 miles
476 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Mission Bend 4.3 mi · Sugar Land 6.8 mi · Stafford 6.8 mi · Missouri City 7.5 mi · Bellaire 8.1 mi · New Territory 9.3 mi · West University Place 9.9 mi · Cinco Ranch 9.9 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 Alief (29.7111°, -95.5963°, elevation 75 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).