Normal weather in August

In August, Normal sees average daytime highs of 82°F and overnight lows near 64°F, with 3.2 in of rain across 9.4 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 82°F through the month. The sky is clear or mostly clear about 41% 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 Normal's 2nd-clearest and 12th-windiest month. For the whole year in context, see Normal's year-round climate.

Daytime high
82°
2nd warmest
Overnight low
64°
11th coldest
Rainfall
3.2 in
9.4 wet days
Daylight
13 h 36 min
5:11 AM – 6:49 PM
Cloud cover
51%
2nd clearest
Wind
7 mph
12th windiest
Solar energy
5.68 kWh/m²
Travel score
6.5
out of 10

Normal is town in McLean County, Illinois, United States.

Density
1,140/km²
people per km²
Founded
1865

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 Normal 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 75°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
58265
68265
78265
88265
98265
108265
118265
128264
138264
148264
158264
168264
178264
188264
198264
208264
218264
228264
238264
248264
258264
268264
278263
288263
298263
308263
318162

How August really feels in Normal

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.

Normal 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
Jan33° / 19°2.38.34.99.40.0
Feb38° / 22°2.17.44.110.40.0
Mar50° / 32°3.110.31.811.72.2
Apr62° / 43°4.4120.5134.9
May72° / 53°4.713.5014.26.1
Jun81° / 63°4.312.2014.86.1
Jul83° / 66°3.810.8014.65.7
Aug82° / 64°3.29.4013.66.5
Sep76° / 56°3.07.8012.37.2
Oct64° / 45°3.38.90.110.95.8
Nov50° / 34°3.08.41.19.72.3
Dec38° / 24°2.38.33.69.20.0

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 18% of August, with mostly cloudy or overcast conditions the remaining 41%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25941
35941
45941
55941
65941
75941
85842
95842
105842
115842
125842
135842
145842
155842
165842
175842
185842
195842
205842
215842
225842
235842
245842
255941
265941
276040
286040
296238
306238
316238

Chance of precipitation in August

Any precipitation

Normal gets around 3.2 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 32% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
130
230
329
429
529
629
728
828
928
1029
1129
1229
1329
1430
1530
1630
1730
1831
1931
2031
2132
2232
2331
2431
2531
2630
2729
2829
2928
3028
3128

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 26% of days. Sticky, muggy-or-worse air turns up on roughly 42% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
16192724221
27192725211
37192725211
47202725201
58202725201
68202725191
78202725191
89202725181
99202725181
1010202724181
1110202724171
1211202724171
1311202724171
1411202724171
1512212624171
1612212624171
1712202724171
1812202624171
1912202624171
2012202624171
2112202625161
2212202625161
2312202625161
2413202625160
2513202625150
2614202525150
2715212525140
2815212525130
2916212525120
3017222525110
3119222524100

Wind in August

Winds average 7 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
157calm
167calm
177calm
187calm
197calm
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 4:57 AM to 5:26 AM, and sunset from 7:07 PM to 6:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.24:577:07
214.14:587:06
314.14:597:05
414.15:007:04
514.05:007:03
614.05:017:02
714.05:027:01
813.95:036:59
913.95:046:58
1013.95:056:57
1113.85:066:56
1213.85:076:54
1313.75:086:53
1413.75:096:52
1513.75:106:50
1613.65:116:49
1713.65:126:47
1813.55:136:46
1913.55:146:44
2013.55:156:43
2113.45:166:41
2213.45:176:40
2313.35:186:38
2413.35:196:37
2513.25:206:35
2613.25:216:34
2713.25:226:32
2813.15:236:30
2913.15:246:29
3013.05:256:27
3113.05:266:26

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.68 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 July across the year — August's 5.68 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.1Intense
46.1Intense
56.0Intense
66.0Intense
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 Normal?

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 Normal for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Normal in August

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

In August, Normal sees daytime highs around 82°F and nights near 64°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Normal 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 Normal 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 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 22UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Normal 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 Normal 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).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodJul 1816 µg/m³Oct 228 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar13Moderate
Apr11Good
May14Moderate
Jun14Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Normal?

Normal sits at 40.5°N, 89.0°W, 801 ft above sea level, in United States. The nearest listed city is Bloomington, 1.9 mi away.

Topography around Normal

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

Within 2 miles, the terrain around Normal has only modest variations in elevation — a maximum elevation change of 151 ft around an average of 810 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 276 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 531 ft.

The land around Normal is covered by artificial surfaces (39%), trees (30%) and grassland (21%) within 2 miles, cropland (74%) within 10 miles, and cropland (83%) within 50 miles.

2 miles
151 ft
10 miles
276 ft
50 miles
531 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Bloomington 1.9 mi · Washington 25 mi · Morton 25 mi · East Peoria 33 mi · Peoria 34 mi · North Peoria 34 mi · Pekin 34 mi · Decatur 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 Normal (40.5142°, -88.9906°, elevation 801 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).