Cypress weather in September

In September, Cypress sees average daytime highs of 89°F and overnight lows near 71°F, with 3.8 in of rain across 10.3 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 5th-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 48% 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 Cypress's 2nd-clearest and 11th-windiest month. For the whole year in context, see Cypress's year-round climate.

Daytime high
89°
4th warmest
Overnight low
71°
9th coldest
Rainfall
3.8 in
10.3 wet days
Daylight
12 h 12 min
6:12 AM – 6:22 PM
Cloud cover
48%
2nd clearest
Wind
6 mph
11th windiest
Solar energy
5.05 kWh/m²
Travel score
4.3
out of 10

Cypress is unincorporated community of Harris County, Texas, United States.

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 Cypress 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 95°F. Set against its neighbours, September runs about 5°F cooler than August and about 8°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19274
29174
39173
49173
59173
69173
79173
89073
99072
109072
119072
129072
138972
148971
158971
168971
178971
188870
198870
208870
218869
228769
238769
248768
258768
268767
278667
288667
298667
308666

How September really feels in Cypress

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.

Cypress weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan62° / 44°3.79.710.35.5
Feb66° / 47°3.18.710.96.1
Mar72° / 54°3.39.311.86.8
Apr79° / 60°3.88.612.76.9
May85° / 68°3.99.913.55.2
Jun91° / 74°4.31213.93.7
Jul93° / 75°2.910.613.73.1
Aug93° / 75°3.311.213.12.9
Sep89° / 71°3.810.312.24.3
Oct81° / 61°3.98.711.36.7
Nov71° / 52°3.88.510.57.0
Dec64° / 46°4.19.810.15.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 48% 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 37%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25842
35941
45941
55941
65941
75941
85941
95941
106040
115941
125941
135941
145941
156040
166040
176040
186238
196337
206436
216535
226634
236832
246931
257129
267228
277327
287327
297327
307426

Chance of precipitation in September

Any precipitation

Cypress gets around 3.8 in of rain over 10.3 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 34% and peaks near 42% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
142
242
342
442
541
641
741
841
940
1039
1139
1238
1337
1437
1536
1635
1734
1833
1932
2031
2130
2229
2328
2427
2527
2626
2725
2825
2925
3024

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 75% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1128195911
2129195910
3139195810
423920579
5231020569
6231020578
7231021568
8331021558
9341021557
10341021557
11341022538
12441022528
13451022518
14451023508
15551123498
16561123478
17661124468
18671224448
19771224427
20881224417
21981224397
221191324377
231291324357
2413101324347
2514101324326
2615111324316
2716111324306
2817111324295
2918121324275
3019121324274

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
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 6:20 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)
112.66:036:42
212.66:046:40
312.66:056:39
412.56:056:38
512.56:066:37
612.56:066:35
712.56:076:34
812.46:076:33
912.46:086:32
1012.46:086:30
1112.36:096:29
1212.36:106:28
1312.36:106:26
1412.26:116:25
1512.26:116:24
1612.26:126:22
1712.16:126:21
1812.16:136:20
1912.16:136:19
2012.16:146:17
2112.06:156:16
2212.06:156:15
2312.06:166:13
2411.96:166:12
2511.96:176:11
2611.96:176:10
2711.86:186:08
2811.86:196:07
2911.86:196:06
3011.76:206:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.05 kWh/m².

For context, solar energy here swings from a low near 2.59 kWh/m² to a high of 6.34 kWh/m² in July across the year — September's 5.05 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.2Bright
75.2Bright
85.2Bright
95.1Bright
105.1Bright
115.1Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
194.9Bright
204.9Bright
214.9Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
304.8Bright
Planning a trip in September

Is September a good time to visit Cypress?

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
6.6
Beach & pool
3rd-best month of the year

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

What to pack for Cypress in September

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

In September, Cypress sees daytime highs around 89°F and nights near 71°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Cypress 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 Cypress 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 Cypress 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 Cypress is worst in July — around 21 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (December, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1520 µg/m³Dec 138 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar11Good
Apr11Good
May15Moderate
Jun17Moderate
Jul21Moderate
Aug15Moderate
Sep12Moderate
Oct8Good
Nov8Good
Dec8Good
Location & terrain

Where is Cypress?

Cypress sits at 30.0°N, 95.7°W, 151 ft above sea level, in United States. The nearest listed city is Katy, 15 mi away.

Topography around Cypress

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

Within 2 miles, the terrain around Cypress has only modest variations in elevation — a maximum elevation change of 66 ft around an average of 151 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 246 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 528 ft.

The land around Cypress is covered by trees (37%), artificial surfaces (31%) and grassland (26%) within 2 miles, trees (38%), grassland (32%) and artificial surfaces (22%) within 10 miles, and trees (46%) and grassland (35%) within 50 miles.

2 miles
66 ft
10 miles
246 ft
50 miles
528 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Katy 15 mi · Cinco Ranch 16 mi · The Woodlands 18 mi · Spring 19 mi · Alief 19 mi · Mission Bend 19 mi · Aldine 19 mi · Bellaire 23 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 Cypress (29.9691°, -95.6972°, elevation 151 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).