Spring weather in September

In September, Spring sees average daytime highs of 89°F and overnight lows near 71°F, with 4.1 in of rain across 11 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 4th-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 46% 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 Spring's 2nd-clearest and 10th-windiest month. For the whole year in context, see Spring's year-round climate.

Daytime high
89°
4th warmest
Overnight low
71°
9th coldest
Rainfall
4.1 in
11 wet days
Daylight
12 h 12 min
6:11 AM – 6:21 PM
Cloud cover
48%
2nd clearest
Wind
6 mph
10th windiest
Solar energy
5.01 kWh/m²
Travel score
4.3
out of 10

Spring is census-designated place in Harris County, Texas, United States.

Density
919/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 91°F in the first days to 86°F by the end.

A typical September day in Spring reaches about 89°F in the afternoon and slips back to 71°F overnight — a 18°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 8°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19173
29173
39173
49173
59173
69073
79073
89072
99072
109072
118972
128972
138971
148971
158971
168971
178871
188870
198870
208870
218769
228769
238769
248768
258768
268667
278667
288667
298666
308566

How September really feels in Spring

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.

Spring weather by month

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

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan62° / 44°4.09.910.35.5
Feb66° / 48°3.28.910.96.1
Mar72° / 54°3.59.611.86.8
Apr78° / 60°3.9912.76.9
May85° / 68°3.810.113.55.3
Jun90° / 74°4.512.813.93.6
Jul92° / 75°3.211.513.73.1
Aug93° / 75°3.511.813.13.0
Sep89° / 71°4.11112.24.3
Oct81° / 61°4.18.711.36.7
Nov71° / 52°3.98.810.56.9
Dec64° / 46°4.29.710.15.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% 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 (%)
15644
25743
35743
45743
55743
65842
75842
85842
95842
105842
115842
125842
135842
145842
155941
166040
176040
186139
196238
206436
216535
226634
236832
246931
257030
267228
277327
287327
297327
307327

Chance of precipitation in September

Any precipitation

Spring gets around 4.1 in of rain over 11 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 37% and peaks near 44% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
144
244
344
444
544
644
743
843
942
1042
1141
1241
1340
1439
1539
1638
1737
1836
1934
2033
2132
2231
2330
2429
2528
2628
2727
2827
2926
3026

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 45% of days. Sticky, muggy-or-worse air turns up on roughly 77% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1127175914
2128175913
3128185912
4228185911
5238195711
6238195810
7239205610
833920569
933920569
1034920559
11349215310
12349215310
13459215110
14459225010
15459224910
165610234710
175610234510
186710234410
197711244210
208811244010
219811243810
2210912243610
231191224349
2412101224339
2514101324319
2615111324308
2716111324297
2817111324287
2918111324276
3019121324276

Wind in September

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

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:026:41
212.66:036:39
312.66:036:38
412.56:046:37
512.56:046:36
612.56:056:34
712.56:066:33
812.46:066:32
912.46:076:30
1012.46:076:29
1112.36:086:28
1212.36:086:27
1312.36:096:25
1412.26:106:24
1512.26:106:23
1612.26:116:21
1712.16:116:20
1812.16:126:19
1912.16:126:17
2012.16:136:16
2112.06:136:15
2212.06:146:14
2312.06:156:12
2411.96:156:11
2511.96:166:10
2611.96:166:08
2711.86:176:07
2811.86:176:06
2911.86:186:05
3011.76:196:03

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 2.58 kWh/m² to a high of 6.28 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
75.2Bright
85.1Bright
95.1Bright
105.1Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
164.9Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.8Bright
294.8Bright
304.8Bright
Planning a trip in September

Is September a good time to visit Spring?

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
3rd-best month of the year

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

What to pack for Spring in September

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

In September, Spring sees daytime highs around 89°F and nights near 71°F. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in Spring 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 Spring peaks around July 21 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 21UV 11Dec 21UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar7High
Apr10Very high
May10Extreme
Jun10Extreme
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov5Moderate
Dec4Moderate

Air quality in Spring 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 Spring 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 Spring?

Spring sits at 30.1°N, 95.4°W, 121 ft above sea level, in United States. The nearest listed city is The Woodlands, 6.8 mi away.

Topography around Spring

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

Within 2 miles, the terrain around Spring has only modest variations in elevation — a maximum elevation change of 108 ft around an average of 125 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 210 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 541 ft.

The land around Spring is covered by trees (53%) and artificial surfaces (33%) within 2 miles, trees (59%) and artificial surfaces (24%) within 10 miles, and trees (54%) and grassland (27%) within 50 miles.

2 miles
108 ft
10 miles
210 ft
50 miles
541 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: The Woodlands 6.8 mi · Aldine 11 mi · Humble 11 mi · New Caney 14 mi · Atascocita 16 mi · Conroe 16 mi · Cypress 19 mi · Houston 22 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 Spring (30.0799°, -95.4172°, elevation 121 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).