Affton weather in July

In July, Affton sees average daytime highs of 88°F and overnight lows near 71°F, with 3.4 in of rain across 10 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 88°F through the month. The sky is clear or mostly clear about 37% 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 Affton's 4th-clearest and 11th-windiest month. For the whole year in context, see Affton's year-round climate.

Daytime high
88°
1st warmest
Overnight low
71°
12th coldest
Rainfall
3.4 in
10 wet days
Daylight
14 h 24 min
4:54 AM – 7:20 PM
Cloud cover
53%
4th clearest
Wind
5 mph
11th windiest
Solar energy
6.4 kWh/m²
Travel score
4.6
out of 10

Affton is Unincorporated community in Missouri, U.S..

Density
1,642/km²
people per km²

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 88°F through the month.

A typical July day in Affton 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 80°F and 95°F. Set against its neighbours, July runs about 3°F warmer than June and about 1°F warmer than August.

60°70°80°90°100°151015202531
Avg high (°F)Avg low (°F)
18770
28770
38770
48770
58770
68871
78871
88871
98871
108871
118871
128871
138871
148871
158871
168871
178871
188871
198871
208871
218871
228871
238871
248871
258871
268871
278870
288870
298770
308770
318770

How July really feels in Affton

Once humidity and wind are folded in, July averages 28 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
28
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.

Affton 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° / 25°2.98.32.89.60.0
Feb45° / 28°2.57.52.710.51.0
Mar56° / 37°3.810.71.211.73.7
Apr67° / 48°4.711.30.2135.9
May76° / 58°5.013.3014.16.3
Jun84° / 67°4.111014.65.3
Jul88° / 71°3.410014.44.6
Aug86° / 68°2.99.3013.55.1
Sep80° / 60°3.27.7012.37.0
Oct68° / 48°3.58.20116.7
Nov55° / 38°3.78.60.79.93.6
Dec44° / 29°2.78.32.29.40.8

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 20% of July, with mostly cloudy or overcast conditions the remaining 43%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25941
35941
45842
55842
65941
75941
85941
95941
105941
115842
125842
135842
145842
155743
165743
175644
185644
195644
205644
215644
225545
235545
245545
255545
265644
275743
285743
295743
305743
315743

Chance of precipitation in July

Any precipitation

Affton gets around 3.4 in of rain over 10 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
235
335
435
535
634
734
833
933
1032
1132
1231
1331
1431
1531
1631
1730
1830
1930
2030
2130
2231
2331
2431
2531
2631
2731
2831
2931
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 (%)
15122131291
25122131301
35122131311
44122130311
54112130321
64112130331
74112130341
83102130341
93102130351
10392130352
11392031362
12392030362
13291930372
14291930382
15291930382
16291829393
172101828393
182101828393
191111827403
201111827403
211121826403
221121826393
231131826393
242131826383
252141926373
262141926362
272142027352
282142127342
292142128332
303142129322
313142129312

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
86calm
96calm
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 7:25 PM to 7:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.74:457:25
214.74:457:24
314.64:467:24
414.64:467:24
514.64:477:24
614.64:477:24
714.64:487:24
814.64:487:23
914.64:497:23
1014.64:507:23
1114.54:507:22
1214.54:517:22
1314.54:527:22
1414.54:527:21
1514.54:537:21
1614.44:547:20
1714.44:547:20
1814.44:557:19
1914.44:567:19
2014.44:577:18
2114.34:577:17
2214.34:587:17
2314.34:597:16
2414.35:007:15
2514.25:017:14
2614.25:017:14
2714.25:027:13
2814.15:037:12
2914.15:047:11
3014.15:057:10
3114.15:067:09

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 6.45 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
26.6Intense
36.6Intense
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 Affton?

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
6.7
Beach & pool
3rd-best month of the year

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

What to pack for Affton in July

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

In July, Affton sees daytime highs around 88°F and nights near 71°F. Pack light clothes and sun protection. Worth having: rain gear. About 10 days see rain.

light clothessun protectionrain gear

UV index in Affton 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 Affton peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 22UV 9Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5High
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Affton 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 Affton is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1418 µg/m³Oct 238 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb12Good
Mar12Good
Apr11Good
May14Moderate
Jun16Moderate
Jul18Moderate
Aug15Moderate
Sep12Moderate
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Affton?

Affton sits at 38.6°N, 90.3°W, 617 ft above sea level, in United States. The nearest listed city is Concord, 2.5 mi away.

Topography around Affton

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

Within 2 miles, the terrain around Affton has only modest variations in elevation — a maximum elevation change of 226 ft around an average of 538 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 604 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,024 ft.

The land around Affton is covered by trees (51%) and artificial surfaces (35%) within 2 miles, trees (47%) and artificial surfaces (28%) within 10 miles, and trees (50%) and cropland (34%) within 50 miles.

2 miles
226 ft
10 miles
604 ft
50 miles
1,024 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
July weather nearby: Concord 2.5 mi · Mehlville 3.1 mi · Lemay 3.1 mi · Webster Groves 3.1 mi · Kirkwood 4.3 mi · Oakville 5.6 mi · Clayton 6.2 mi · University City 7.5 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 Affton (38.5506°, -90.3332°, elevation 617 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).