Pekin weather in August

In August, Pekin sees average daytime highs of 83°F and overnight lows near 65°F, with 3.1 in of rain across 8.9 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 83°F through the month. The sky is clear or mostly clear about 43% of the time in August, and the air most often feels muggy.

Daylight stretches from about 14 h 12 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Pekin's 2nd-clearest and 12th-windiest month. For the whole year in context, see Pekin's year-round climate.

Daytime high
83°
2nd warmest
Overnight low
65°
11th coldest
Rainfall
3.1 in
8.9 wet days
Daylight
13 h 36 min
5:14 AM – 6:51 PM
Cloud cover
50%
2nd clearest
Wind
6 mph
12th windiest
Solar energy
5.67 kWh/m²
Travel score
6.2
out of 10

Pekin is city and county seat of Tazewell County, Illinois, United States.

Density
832/km²
people per km²
Founded
1829

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 83°F through the month.

A typical August day in Pekin reaches about 83°F in the afternoon and slips back to 65°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 91°F. Set against its neighbours, August runs about 1°F cooler than July and about 6°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18466
28466
38466
48366
58366
68366
78366
88366
98365
108365
118365
128365
138365
148365
158365
168365
178365
188365
198365
208365
218365
228365
238365
248364
258364
268364
278264
288264
298264
308263
318263

How August really feels in Pekin

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

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Pekin weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan34° / 20°2.18.34.89.40.0
Feb39° / 23°2.17.13.910.40.1
Mar51° / 33°3.010.11.711.72.4
Apr63° / 43°4.511.40.5135.1
May73° / 54°4.613014.26.2
Jun82° / 64°4.611.7014.86.0
Jul84° / 67°3.710.2014.65.5
Aug83° / 65°3.18.9013.66.2
Sep77° / 57°3.17.5012.37.3
Oct64° / 45°3.18.60.110.96.0
Nov50° / 34°2.98.119.72.4
Dec39° / 25°2.37.53.19.20.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 17% of August, with mostly cloudy or overcast conditions the remaining 40%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16040
26040
36040
46139
56040
66040
76040
85941
95941
105941
115941
125941
135941
145941
155941
165941
175941
185941
195941
205941
215941
225941
235842
245842
255941
266040
276040
286139
296139
306238
316238

Chance of precipitation in August

Any precipitation

Pekin gets around 3.1 in of rain over 8.9 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 28% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
130
229
329
429
528
628
728
827
928
1028
1128
1228
1328
1428
1528
1628
1728
1829
1929
2029
2129
2229
2329
2429
2528
2628
2727
2826
2926
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 26% of days. Sticky, muggy-or-worse air turns up on roughly 45% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
15182627232
25182627222
35182627222
45182727221
55182727211
66192727211
76192726201
87192726201
97192726201
107192726191
118192725191
128202725191
138202725182
148202725181
158202725181
169202725181
179212725181
189202625181
199202626181
209202626181
219202627181
229202627171
239202627171
249202528171
2510202528171
2610202527161
2711212527150
2812212527150
2913212527140
3014212526130
3115222526120

Wind in August

Winds average 6 mph in August, the calmest month.

Across August, daily wind ranges from about 6 mph on the calmest days to 7 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
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
307calm
317calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 12 min at the start of August to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over August. Sunrise moves from 4:59 AM to 5:29 AM, and sunset from 7:10 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.24:597:10
214.15:007:09
314.15:017:08
414.15:027:07
514.05:037:06
614.05:047:04
714.05:057:03
813.95:067:02
913.95:077:01
1013.95:087:00
1113.85:096:58
1213.85:106:57
1313.75:116:56
1413.75:126:54
1513.75:136:53
1613.65:146:51
1713.65:156:50
1813.55:166:49
1913.55:176:47
2013.55:186:46
2113.45:196:44
2213.45:206:43
2313.35:216:41
2413.35:226:40
2513.35:236:38
2613.25:246:36
2713.25:256:35
2813.15:266:33
2913.15:276:32
3013.05:286:30
3113.05:296:28

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.67 kWh/m².

For context, solar energy here swings from a low near 1.77 kWh/m² to a high of 6.4 kWh/m² in June across the year — August's 5.67 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.0Intense
56.0Intense
66.0Bright
76.0Bright
85.9Bright
95.9Bright
105.9Bright
115.8Bright
125.8Bright
135.8Bright
145.7Bright
155.7Bright
165.7Bright
175.6Bright
185.6Bright
195.6Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.4Bright
255.4Bright
265.4Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
315.2Bright
Planning a trip in August

Is August a good time to visit Pekin?

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

6.2
Sightseeing
2nd-best month of the year
7.2
Beach & pool
1st-best month of the year

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

What to pack for Pekin in August

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

In August, Pekin sees daytime highs around 83°F and nights near 65°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Pekin in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Pekin peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 20UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Pekin 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 Pekin is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 1916 µg/m³Oct 228 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar13Moderate
Apr11Good
May14Moderate
Jun13Moderate
Jul16Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Pekin?

Pekin sits at 40.6°N, 89.6°W, 502 ft above sea level, in United States. The nearest listed city is East Peoria, 7.5 mi away.

Topography around Pekin

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

Within 2 miles, the terrain around Pekin has only modest variations in elevation — a maximum elevation change of 243 ft around an average of 509 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 384 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 535 ft.

The land around Pekin is covered by trees (32%) and artificial surfaces (26%) within 2 miles, cropland (49%) and trees (30%) within 10 miles, and cropland (74%) within 50 miles.

2 miles
243 ft
10 miles
384 ft
50 miles
535 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: East Peoria 7.5 mi · Peoria 9.3 mi · Morton 9.9 mi · North Peoria 11 mi · Washington 16 mi · Normal 34 mi · Bloomington 34 mi · Galesburg 47 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 Pekin (40.5675°, -89.6407°, elevation 502 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).