Chesterfield weather in July

In July, Chesterfield sees average daytime highs of 87°F and overnight lows near 70°F, with 3.3 in of rain across 9.8 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 Chesterfield's 4th-clearest and 11th-windiest month. For the whole year in context, see Chesterfield's year-round climate.

Daytime high
87°
1st warmest
Overnight low
70°
12th coldest
Rainfall
3.3 in
9.8 wet days
Daylight
14 h 30 min
4:54 AM – 7:22 PM
Cloud cover
52%
4th clearest
Wind
5 mph
11th windiest
Solar energy
6.4 kWh/m²
Travel score
4.7
out of 10

Chesterfield is city in St. Louis County, Missouri, United States.

Density
551/km²
people per km²
Founded
1837

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 Chesterfield 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 2°F warmer than August.

60°70°80°90°100°151015202531
Avg high (°F)Avg low (°F)
18769
28770
38770
48770
58770
68770
78770
88770
98770
108771
118871
128871
138871
148871
158871
168871
178871
188871
198871
208871
218871
228871
238871
248770
258770
268770
278770
288770
298770
308770
318770

How July really feels in Chesterfield

Once humidity and wind are folded in, July averages 24 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
24
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.

Chesterfield 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
Jan39° / 24°2.6839.60.0
Feb44° / 28°2.47.82.810.50.8
Mar55° / 37°3.710.81.411.73.5
Apr66° / 47°4.511.40.2135.8
May75° / 58°4.913.4014.16.2
Jun84° / 67°4.011.2014.65.4
Jul87° / 70°3.39.8014.44.7
Aug86° / 68°2.99013.55.3
Sep79° / 60°3.27.6012.37.1
Oct67° / 48°3.48.40116.6
Nov54° / 37°3.68.70.89.93.5
Dec43° / 28°2.58.12.29.30.6

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 18% of July, with mostly cloudy or overcast conditions the remaining 43%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15842
25842
35842
45743
55842
65842
75842
85842
95842
105842
115842
125842
135842
145842
155842
165743
175743
185743
195743
205743
215743
225743
235743
245743
255743
265743
275743
285743
295743
305743
315743

Chance of precipitation in July

Any precipitation

Chesterfield gets around 3.3 in of rain over 9.8 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 31% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
235
335
435
534
634
733
832
932
1031
1130
1230
1329
1429
1529
1629
1729
1829
1929
2029
2129
2230
2330
2430
2531
2631
2731
2831
2932
3031
3131

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 36% of days. Sticky, muggy-or-worse air turns up on roughly 66% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
15132131301
24132131311
34122130321
44122130321
54122030331
63112030341
73112030341
83112030352
93101931352
103101931362
112101931362
12291831372
13291831372
142101830382
152101830382
162101829392
172111828392
182111827392
192111827403
202121826402
212121825402
222131925402
232131924402
242131924392
252132024392
262142124382
272142124372
282142225362
292142225352
303142226342
313142227331

Wind in July

Winds average 5 mph in July.

Across July, 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.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
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 4:45 AM to 5:06 AM, and sunset from 7:26 PM to 7:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.74:457:26
214.74:467:26
314.74:467:26
414.64:477:26
514.64:477:25
614.64:487:25
714.64:487:25
814.64:497:25
914.64:507:24
1014.64:507:24
1114.54:517:24
1214.54:517:23
1314.54:527:23
1414.54:537:23
1514.54:547:22
1614.54:547:22
1714.44:557:21
1814.44:567:20
1914.44:567:20
2014.44:577:19
2114.34:587:19
2214.34:597:18
2314.35:007:17
2414.35:007:16
2514.25:017:16
2614.25:027:15
2714.25:037:14
2814.25:047:13
2914.15:057:12
3014.15:067:11
3114.15:067:10

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 1.91 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
176.4Intense
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

Hazard calendar for Chesterfield

In seasonPeak

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

Chesterfield 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 July a good time to visit Chesterfield?

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

4.7
Sightseeing
7th-best month of the year
6.8
Beach & pool
3rd-best month of the year

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

What to pack for Chesterfield in July

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

In July, Chesterfield 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 Chesterfield 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 Chesterfield peaks around June 23 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 highModerateJun 23UV 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 Chesterfield 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 Chesterfield 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 Chesterfield?

Chesterfield sits at 38.7°N, 90.6°W, 472 ft above sea level, in United States. The nearest listed city is Ballwin, 5.0 mi away.

Topography around Chesterfield

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

Within 2 miles, the terrain around Chesterfield has only modest variations in elevation — a maximum elevation change of 246 ft around an average of 531 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 643 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,040 ft.

The land around Chesterfield is covered by trees (44%) and artificial surfaces (21%) within 2 miles, trees (58%) within 10 miles, and trees (54%) and cropland (29%) within 50 miles.

2 miles
246 ft
10 miles
643 ft
50 miles
1,040 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
July weather nearby: Ballwin 5.0 mi · Manchester 5.6 mi · Wildwood 7.5 mi · Creve Coeur 8.1 mi · Maryland Heights 8.7 mi · Saint Charles 9.9 mi · Saint Peters 9.9 mi · Kirkwood 11 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 Chesterfield (38.6631°, -90.5771°, elevation 472 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). 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).