East Saint Louis weather in August

In August, East Saint Louis sees average daytime highs of 86°F and overnight lows near 68°F, with 2.9 in of rain across 9.3 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 42% 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 East Saint Louis's 3rd-clearest and 12th-windiest month. For the whole year in context, see East Saint Louis's year-round climate.

Daytime high
86°
2nd warmest
Overnight low
68°
11th coldest
Rainfall
2.9 in
9.3 wet days
Daylight
13 h 30 min
5:19 AM – 6:50 PM
Cloud cover
50%
3rd clearest
Wind
5 mph
12th windiest
Solar energy
5.79 kWh/m²
Travel score
5.1
out of 10

East Saint Louis is city in St. Clair County, Illinois, United States.

Density
730/km²
people per km²
Founded
1820

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 East Saint Louis reaches about 86°F in the afternoon and slips back to 68°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 79°F and 94°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)
18770
28770
38770
48769
58769
68769
78769
88769
98769
108769
118769
128769
138769
148668
158668
168668
178668
188668
198668
208668
218668
228668
238668
248668
258667
268667
278667
288567
298567
308566
318566

How August really feels in East Saint Louis

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.

East Saint Louis 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°2.98.32.89.60.0
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 August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 20% 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 (%)
15743
25743
35842
45842
55842
65941
75941
86040
96040
106040
116040
126238
136238
146337
156337
166337
176436
186436
196436
206436
216436
226436
236337
246436
256436
266436
276436
286436
296535
306535
316535

Chance of precipitation in August

Any precipitation

East Saint Louis gets around 2.9 in of rain over 9.3 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 32% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
131
231
331
431
531
631
731
831
931
1031
1131
1231
1332
1431
1531
1631
1731
1831
1930
2030
2130
2229
2329
2429
2528
2628
2727
2827
2927
3026
3126

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 32% 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 (%)
13142130302
23142131292
34142132281
44132133281
54142133271
64142134261
75142134261
85142034251
95142034251
105151934251
116151934251
126161934251
136161934241
146171933241
156171933241
166171933241
176171932241
186172032241
196172032251
206172032251
216172032251
226162131250
236162131250
246162231250
256162231250
267162331240
277162331240
288162330230
298162430220
309162430210
3110162430200

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 6 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
316calm

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 5:06 AM to 5:33 AM, and sunset from 7:08 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:067:08
214.05:077:07
314.05:077:06
413.95:087:05
513.95:097:04
613.95:107:02
713.85:117:01
813.85:127:00
913.85:136:59
1013.75:146:58
1113.75:156:57
1213.75:166:55
1313.65:166:54
1413.65:176:53
1513.65:186:51
1613.55:196:50
1713.55:206:49
1813.45:216:47
1913.45:226:46
2013.45:236:45
2113.35:246:43
2213.35:256:42
2313.25:266:40
2413.25:276:39
2513.25:276:37
2613.15:286:36
2713.15:296:34
2813.05:306:33
2913.05:316:31
3013.05:326:30
3112.95:336:28

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.79 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 — August's 5.79 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.1Intense
56.1Intense
66.0Intense
76.0Intense
86.0Bright
96.0Bright
105.9Bright
115.9Bright
125.9Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.8Bright
185.7Bright
195.7Bright
205.7Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.5Bright
265.5Bright
275.5Bright
285.4Bright
295.4Bright
305.3Bright
315.3Bright
Planning a trip in August

Is August a good time to visit East Saint Louis?

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

5.1
Sightseeing
6th-best month of the year
7.1
Beach & pool
1st-best month of the year

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

What to pack for East Saint Louis in August

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

In August, East Saint Louis 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 East Saint Louis 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 East Saint Louis peaks around June 21 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 21UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in East Saint Louis 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 East Saint Louis 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 East Saint Louis?

East Saint Louis sits at 38.6°N, 90.2°W, 417 ft above sea level, in United States. The nearest listed city is St. Louis, 2.5 mi away.

Topography around East Saint Louis

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

Within 2 miles, the terrain around East Saint Louis has only modest variations in elevation — a maximum elevation change of 121 ft around an average of 417 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 397 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 981 ft.

The land around East Saint Louis is covered by trees (33%), artificial surfaces (33%) and grassland (20%) within 2 miles, trees (36%) and artificial surfaces (26%) within 10 miles, and trees (43%) and cropland (42%) within 50 miles.

2 miles
121 ft
10 miles
397 ft
50 miles
981 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: St. Louis 2.5 mi · Granite City 5.6 mi · University City 8.7 mi · Fairview Heights 8.7 mi · Lemay 9.3 mi · Clayton 9.3 mi · Collinsville 9.3 mi · Affton 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 East Saint Louis (38.6245°, -90.1509°, elevation 417 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).