Kankakee weather in August

In August, Kankakee sees average daytime highs of 82°F and overnight lows near 64°F, with 3.4 in of rain across 9.5 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 82°F through the month. The sky is clear or mostly clear about 38% of the time in August, and the air most often feels humid.

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 Kankakee's 2nd-clearest and 12th-windiest month. For the whole year in context, see Kankakee's year-round climate.

Daytime high
82°
2nd warmest
Overnight low
64°
11th coldest
Rainfall
3.4 in
9.5 wet days
Daylight
13 h 42 min
5:06 AM – 6:45 PM
Cloud cover
53%
2nd clearest
Wind
6 mph
12th windiest
Solar energy
5.56 kWh/m²
Travel score
6.5
out of 10

Kankakee is city in Kankakee County, Illinois, United States.

Density
665/km²
people per km²
Founded
1853

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 82°F through the month.

A typical August day in Kankakee reaches about 82°F in the afternoon and slips back to 64°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 74°F and 90°F. Set against its neighbours, August runs on par with July and about 6°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18365
28365
38365
48365
58365
68265
78264
88264
98264
108264
118264
128264
138264
148264
158264
168264
178264
188264
198264
208264
218263
228263
238263
248263
258263
268263
278263
288262
298162
308162
318162

How August really feels in Kankakee

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.

Kankakee weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan33° / 19°2.58.95.39.40.0
Feb38° / 22°2.17.44.210.40.0
Mar49° / 31°3.110.42.211.72.0
Apr62° / 42°4.312.20.613.14.8
May72° / 52°4.513.1014.36.1
Jun80° / 62°4.112.4014.96.0
Jul83° / 66°3.711.2014.75.7
Aug82° / 64°3.49.5013.66.5
Sep76° / 56°3.08.1012.37.1
Oct64° / 45°3.29.10.110.95.8
Nov50° / 34°2.98.61.19.72.3
Dec38° / 25°2.38.23.49.10.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 19% of August, with mostly cloudy or overcast conditions the remaining 44%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15644
25644
35644
45644
55743
65743
75644
85644
95644
105644
115545
125545
135545
145644
155644
165644
175644
185644
195644
205545
215545
225644
235644
245644
255644
265644
275743
285842
295842
305842
315941

Chance of precipitation in August

Any precipitation

Kankakee gets around 3.4 in of rain over 9.5 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
330
430
530
629
729
829
930
1030
1130
1230
1330
1431
1531
1631
1731
1831
1931
2031
2132
2232
2332
2431
2531
2631
2730
2830
2930
3029
3129

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the humid band about 25% of days. Sticky, muggy-or-worse air turns up on roughly 40% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
18212625182
28222625171
38222625171
48232625171
58232525171
69242525171
79242525171
810242524161
910242424161
1011242424161
1111242424161
1212242524151
1312232523151
1412232523151
1513232523141
1613232523141
1713232624141
1813222624131
1914222625131
2014212625131
2114212626121
2214212626121
2314212627121
2414212627121
2515212627111
2615212527111
2716222526101
2817222426100
291822242690
301923242690
312023232580

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
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
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 4:51 AM to 5:21 AM, and sunset from 7:04 PM to 6:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.24:517:04
214.24:527:03
314.24:537:02
414.14:547:01
514.14:557:00
614.04:566:59
714.04:576:57
814.04:586:56
913.94:596:55
1013.95:006:54
1113.95:016:52
1213.85:026:51
1313.85:036:50
1413.75:046:48
1513.75:056:47
1613.75:066:45
1713.65:076:44
1813.65:086:42
1913.55:096:41
2013.55:106:39
2113.45:116:38
2213.45:126:36
2313.45:136:35
2413.35:146:33
2513.35:156:32
2613.25:166:30
2713.25:176:28
2813.15:186:27
2913.15:196:25
3013.15:206:23
3113.05:216:22

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.56 kWh/m².

For context, solar energy here swings from a low near 1.7 kWh/m² to a high of 6.33 kWh/m² in June across the year — August's 5.56 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.0Intense
26.0Intense
36.0Bright
45.9Bright
55.9Bright
65.9Bright
75.8Bright
85.8Bright
95.8Bright
105.7Bright
115.7Bright
125.7Bright
135.6Bright
145.6Bright
155.6Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.4Bright
215.4Bright
225.4Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.2Bright
295.2Bright
305.2Bright
315.1Bright
Planning a trip in August

Is August a good time to visit Kankakee?

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

6.5
Sightseeing
2nd-best month of the year
7.0
Beach & pool
1st-best month of the year

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

What to pack for Kankakee in August

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

In August, Kankakee sees daytime highs around 82°F and nights near 64°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Kankakee in August

The nearest coast averages about 73°F in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 43 mi away) is warmest in August at about 73°F and coldest in February near 35°F.

It's comfortable for a long swim from Jul 10 to Sep 16 — about 2.3 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan38Bracing
Feb35Bracing
Mar35Bracing
Apr39Bracing
May46Bracing
Jun59Cool
Jul70Refreshing
Aug73Refreshing
Sep68Refreshing
Oct58Bracing
Nov49Bracing
Dec42Bracing

UV index in Kankakee 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 Kankakee peaks around June 21 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 highHighModerateLowJun 21UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Kankakee 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 Kankakee is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1418 µg/m³Oct 238 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar15Moderate
Apr15Moderate
May17Moderate
Jun17Moderate
Jul18Moderate
Aug16Moderate
Sep12Moderate
Oct8Good
Nov9Good
Dec10Good
Location & terrain

Where is Kankakee?

Kankakee sits at 41.1°N, 87.9°W, 656 ft above sea level, in United States. The nearest listed city is Bradley, 1.2 mi away.

Topography around Kankakee

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

Within 2 miles, the terrain around Kankakee has only modest variations in elevation — a maximum elevation change of 121 ft around an average of 633 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 272 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 564 ft.

The land around Kankakee is covered by artificial surfaces (37%) and trees (30%) within 2 miles, cropland (75%) within 10 miles, and cropland (70%) within 50 miles.

2 miles
121 ft
10 miles
272 ft
50 miles
564 ft
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Bradley 1.2 mi · Bourbonnais 2.5 mi · Frankfort 26 mi · Park Forest 27 mi · Matteson 27 mi · New Lenox 27 mi · Mokena 28 mi · Chicago Heights 29 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 Kankakee (41.12°, -87.8611°, elevation 656 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).