Ballwin weather in August

In August, Ballwin sees average daytime highs of 86°F and overnight lows near 68°F, with 3.0 in of rain across 9.4 wet days and about 13.5 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 86°F through the month. The sky is clear or mostly clear about 41% of the time in August, and the air most often feels muggy.

Daylight stretches from about 14 hours at the start of August to 12 h 54 min by month's end. Set against the rest of the year, August is Ballwin's 3rd-clearest and 12th-windiest month. For the whole year in context, see Ballwin's year-round climate.

Daytime high
86°
2nd warmest
Overnight low
68°
11th coldest
Rainfall
3.0 in
9.4 wet days
Daylight
13 h 30 min
5:21 AM – 6:52 PM
Cloud cover
50%
3rd clearest
Wind
5 mph
12th windiest
Solar energy
5.77 kWh/m²
Travel score
5.0
out of 10

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

Density
1,313/km²
people per km²
Founded
1804

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 86°F through the month.

A typical August day in Ballwin reaches about 86°F in the afternoon and slips back to 68°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 79°F and 95°F. Set against its neighbours, August runs about 1°F cooler than July and about 7°F warmer than September.

60°80°100°151015202531
Avg high (°F)Avg low (°F)
18769
28769
38769
48769
58769
68769
78769
88769
98769
108768
118768
128768
138768
148768
158768
168768
178668
188668
198668
208667
218667
228667
238667
248667
258667
268667
278667
288566
298566
308566
318566

How August really feels in Ballwin

Once humidity and wind are folded in, August averages 2 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
2
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

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

Ballwin weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan40° / 25°2.88.12.89.60.0
Feb45° / 28°2.57.72.810.51.0
Mar56° / 37°3.810.81.411.73.6
Apr67° / 47°4.611.30.2135.9
May75° / 58°4.913.3014.16.3
Jun84° / 67°4.011.2014.65.4
Jul88° / 70°3.410.2014.44.5
Aug86° / 68°3.09.4013.55.0
Sep80° / 60°3.27.8012.37.0
Oct68° / 48°3.58.10116.7
Nov55° / 38°3.68.30.79.93.6
Dec44° / 29°2.68.22.29.40.8

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 21% of August, with mostly cloudy or overcast conditions the remaining 38%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15644
25644
35644
45743
55743
65743
75842
85941
95941
105941
116040
126139
136139
146238
156238
166337
176337
186436
196436
206436
216535
226436
236436
246436
256535
266535
276535
286535
296535
306535
316535

Chance of precipitation in August

Any precipitation

Ballwin gets around 3.0 in of rain over 9.4 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
133
233
333
432
532
632
732
832
932
1032
1132
1232
1332
1432
1532
1631
1731
1830
1930
2030
2129
2229
2329
2428
2528
2628
2727
2827
2927
3027
3127

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the muggy band about 33% of days. Sticky, muggy-or-worse air turns up on roughly 58% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
14142130292
24132131292
34132132281
44132133271
54132133271
65132133261
75132134261
85142134261
96142034251
106142034251
116141934251
126151934251
136151934251
146161934251
157161934241
167161933241
177161933241
187161933241
197162033241
207162033240
217162033241
227162033241
237152033241
247152133241
257152133231
267152233231
278152233220
288152333210
299152332200
3010152332190
3110162432180

Wind in August

Winds average 5 mph in August, the calmest month.

Across August, 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 August

DaylightNight

Daylight runs from about 14 hours at the start of August to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over August. Sunrise moves from 5:07 AM to 5:35 AM, and sunset from 7:09 PM to 6:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:077:09
214.05:087:08
314.05:097:07
413.95:107:06
513.95:117:05
613.95:127:04
713.85:137:03
813.85:147:02
913.85:147:01
1013.75:156:59
1113.75:166:58
1213.75:176:57
1313.65:186:56
1413.65:196:54
1513.65:206:53
1613.55:216:52
1713.55:226:50
1813.45:236:49
1913.45:246:48
2013.45:256:46
2113.35:256:45
2213.35:266:43
2313.25:276:42
2413.25:286:40
2513.25:296:39
2613.15:306:38
2713.15:316:36
2813.05:326:34
2913.05:336:33
3013.05:346:31
3112.95:356:30

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.77 kWh/m².

For context, solar energy here swings from a low near 1.93 kWh/m² to a high of 6.42 kWh/m² in June across the year — August's 5.77 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.0Intense
56.0Intense
66.0Intense
76.0Bright
86.0Bright
95.9Bright
105.9Bright
115.9Bright
125.9Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.6Bright
225.6Bright
235.6Bright
245.5Bright
255.5Bright
265.5Bright
275.4Bright
285.4Bright
295.4Bright
305.3Bright
315.3Bright
Planning a trip in August

Is August a good time to visit Ballwin?

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

5.0
Sightseeing
6th-best month of the year
7.0
Beach & pool
1st-best month of the year

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

What to pack for Ballwin in August

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

In August, Ballwin sees daytime highs around 86°F and nights near 68°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Ballwin in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Ballwin 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 Ballwin in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Ballwin is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (November, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodGoodModerateGoodJul 1517 µg/m³Nov 127 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar13Moderate
Apr10Good
May13Moderate
Jun15Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov7Good
Dec8Good
Location & terrain

Where is Ballwin?

Ballwin sits at 38.6°N, 90.5°W, 630 ft above sea level, in United States. The nearest listed city is Manchester, 1.9 mi away.

Topography around Ballwin

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

Within 2 miles, the terrain around Ballwin has only modest variations in elevation — a maximum elevation change of 253 ft around an average of 630 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 581 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,234 ft.

The land around Ballwin is covered by trees (61%) and artificial surfaces (24%) within 2 miles, trees (66%) within 10 miles, and trees (54%) and cropland (28%) within 50 miles.

2 miles
253 ft
10 miles
581 ft
50 miles
1,234 ft
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Manchester 1.9 mi · Chesterfield 5.0 mi · Wildwood 6.2 mi · Kirkwood 7.5 mi · Creve Coeur 8.1 mi · Webster Groves 9.9 mi · Maryland Heights 11 mi · Concord 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 Ballwin (38.5951°, -90.5462°, elevation 630 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).