Wentzville weather in July

In July, Wentzville sees average daytime highs of 87°F and overnight lows near 70°F, with 3.2 in of rain across 9.9 wet days and about 14.4 hours of daylight. It is the 1st-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 87°F through the month. The sky is clear or mostly clear about 39% of the time in July, and the air most often feels oppressive.

Daylight stretches from about 14 h 42 min at the start of July to 14 h 06 min by month's end. Set against the rest of the year, July is Wentzville's 4th-clearest and 11th-windiest month. For the whole year in context, see Wentzville's year-round climate.

Daytime high
87°
1st warmest
Overnight low
70°
12th coldest
Rainfall
3.2 in
9.9 wet days
Daylight
14 h 30 min
4:55 AM – 7:23 PM
Cloud cover
52%
4th clearest
Wind
5 mph
11th windiest
Solar energy
6.4 kWh/m²
Travel score
4.6
out of 10

Wentzville is city in St. Charles County, Missouri, United States.

Density
683/km²
people per km²
Founded
1855

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 87°F through the month.

A typical July day in Wentzville reaches about 87°F in the afternoon and slips back to 70°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 80°F and 95°F. Set against its neighbours, July runs about 4°F warmer than June and about 1°F warmer than August.

60°70°80°90°100°151015202531
Avg high (°F)Avg low (°F)
18769
28769
38769
48769
58770
68770
78770
88770
98770
108870
118870
128870
138870
148871
158871
168871
178871
188871
198871
208870
218870
228870
238870
248870
258870
268770
278770
288770
298769
308769
318769

How July really feels in Wentzville

Once humidity and wind are folded in, July averages 27 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
27
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in July is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Wentzville weather by month

How July compares with the rest of the year at a glance. July is the 1st-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan40° / 24°2.57.739.60.0
Feb44° / 28°2.47.62.910.50.8
Mar55° / 37°3.610.61.411.73.5
Apr66° / 47°4.511.30.2135.8
May75° / 57°4.913.3014.16.3
Jun84° / 66°4.011.1014.75.5
Jul87° / 70°3.29.9014.44.6
Aug86° / 67°3.09.2013.55.2
Sep79° / 59°3.27.6012.37.1
Oct67° / 48°3.38.50116.6
Nov54° / 37°3.58.30.89.93.5
Dec43° / 28°2.47.72.29.30.6

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 19% of July, with mostly cloudy or overcast conditions the remaining 42%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25842
35842
45842
55842
65842
75842
85941
95941
105941
115941
125842
135842
145842
155842
165842
175842
185842
195743
205743
215743
225743
235743
245743
255743
265842
275743
285743
295842
305842
315842

Chance of precipitation in July

Any precipitation

Wentzville gets around 3.2 in of rain over 9.9 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 32% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
236
336
435
535
634
734
833
932
1032
1131
1230
1330
1430
1530
1630
1730
1830
1930
2030
2130
2230
2331
2431
2531
2632
2732
2832
2932
3032
3132

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the oppressive band about 37% of days. Sticky, muggy-or-worse air turns up on roughly 68% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
14132131311
24132130321
33132030331
43122029341
53122029341
63122029352
73112029352
82111930362
92101930362
10291931372
11291931372
12291831382
13281831383
14281831393
15181830393
16191830393
17191829393
18191928403
191101927403
201101927403
211111926403
221111926403
231121925403
241122025403
251122025393
261132125382
272132125372
282132126362
292132126352
302132127342
312132128342

Wind in July

Winds average 5 mph in July.

Across July, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
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
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 14 h 42 min at the start of July to 14 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over July. Sunrise moves from 4:46 AM to 5:07 AM, and sunset from 7:27 PM to 7:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.74:467:27
214.74:477:27
314.74:477:27
414.74:487:27
514.64:487:27
614.64:497:27
714.64:497:27
814.64:507:26
914.64:507:26
1014.64:517:26
1114.64:527:25
1214.54:527:25
1314.54:537:25
1414.54:547:24
1514.54:547:24
1614.54:557:23
1714.44:567:23
1814.44:567:22
1914.44:577:21
2014.44:587:21
2114.44:597:20
2214.35:007:19
2314.35:007:19
2414.35:017:18
2514.35:027:17
2614.25:037:16
2714.25:047:16
2814.25:057:15
2914.15:057:14
3014.15:067:13
3114.15:077:12

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 6.4 kWh/m².

For context, solar energy here swings from a low near 1.92 kWh/m² to a high of 6.42 kWh/m² in June across the year — July's 6.4 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.6Intense
26.5Intense
36.5Intense
46.5Intense
56.5Intense
66.5Intense
76.5Intense
86.5Intense
96.5Intense
106.5Intense
116.5Intense
126.5Intense
136.5Intense
146.5Intense
156.5Intense
166.5Intense
176.5Intense
186.4Intense
196.4Intense
206.4Intense
216.4Intense
226.3Intense
236.3Intense
246.3Intense
256.3Intense
266.3Intense
276.2Intense
286.2Intense
296.2Intense
306.2Intense
316.2Intense
Planning a trip in July

Is July a good time to visit Wentzville?

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

4.6
Sightseeing
7th-best month of the year
6.8
Beach & pool
3rd-best month of the year

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

What to pack for Wentzville in July

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

In July, Wentzville sees daytime highs around 87°F and nights near 70°F. Pack light clothes and sun protection. Worth having: rain gear. About 10 days see rain.

light clothessun protectionrain gear

UV index in Wentzville in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Wentzville peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 22UV 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Wentzville in July

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.

Air quality in Wentzville is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (October, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1616 µg/m³Oct 237 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar11Good
Apr10Good
May13Moderate
Jun14Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov7Good
Dec8Good
Location & terrain

Where is Wentzville?

Wentzville sits at 38.8°N, 90.9°W, 623 ft above sea level, in United States. The nearest listed city is O'Fallon, 8.1 mi away.

Topography around Wentzville

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

Within 2 miles, the terrain around Wentzville has only modest variations in elevation — a maximum elevation change of 184 ft around an average of 610 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 541 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 984 ft.

The land around Wentzville is covered by artificial surfaces (34%), trees (33%) and grassland (25%) within 2 miles, trees (46%), grassland (23%) and cropland (21%) within 10 miles, and trees (54%) and cropland (28%) within 50 miles.

2 miles
184 ft
10 miles
541 ft
50 miles
984 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
July weather nearby: O'Fallon 8.1 mi · Saint Peters 12 mi · Chesterfield 18 mi · Wildwood 19 mi · Saint Charles 20 mi · Ballwin 22 mi · Manchester 24 mi · Maryland Heights 24 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 Wentzville (38.8114°, -90.8529°, elevation 623 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).