Belvidere weather in August

In August, Belvidere sees average daytime highs of 80°F and overnight lows near 62°F, with 3.4 in of rain across 9.7 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 80°F through the month. The sky is clear or mostly clear about 36% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 14 h 18 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Belvidere's 2nd-clearest and 12th-windiest month. For the whole year in context, see Belvidere's year-round climate.

Daytime high
80°
2nd warmest
Overnight low
62°
11th coldest
Rainfall
3.4 in
9.7 wet days
Daylight
13 h 42 min
5:08 AM – 6:51 PM
Cloud cover
55%
2nd clearest
Wind
6 mph
12th windiest
Solar energy
5.38 kWh/m²
Travel score
6.7
out of 10

Belvidere is city in Illinois, United States.

Density
788/km²
people per km²
Founded
1835

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 80°F through the month.

A typical August day in Belvidere reaches about 80°F in the afternoon and slips back to 62°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 72°F and 87°F. Set against its neighbours, August runs about 2°F cooler than July and about 6°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18164
28164
38163
48163
58163
68063
78063
88063
98063
108063
118062
128062
138062
148062
158062
168062
178062
188062
197962
207962
217962
227962
237962
247961
257961
267961
277961
287961
297960
307860
317860

How August really feels in Belvidere

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.

Belvidere weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan29° / 15°1.97.75.89.30.0
Feb33° / 19°1.87.25.110.30.0
Mar45° / 29°2.59.43.311.61.2
Apr58° / 39°4.212113.13.9
May69° / 50°4.412.5014.45.9
Jun78° / 60°3.911.70156.4
Jul82° / 64°3.410.2014.86.4
Aug80° / 62°3.49.7013.76.7
Sep73° / 54°3.28.6012.37.0
Oct60° / 42°3.08.80.110.85.0
Nov46° / 31°2.47.91.89.61.3
Dec34° / 21°2.17.84.890.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% 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 45%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15644
25644
35545
45446
55446
65446
75446
85446
95347
105347
115347
125347
135446
145446
155446
165446
175446
185446
195446
205446
215347
225347
235446
245446
255545
265545
275644
285743
295743
305842
315842

Chance of precipitation in August

Any precipitation

Belvidere gets around 3.4 in of rain over 9.7 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 31% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
134
234
333
433
533
633
733
833
932
1032
1132
1232
1332
1432
1532
1632
1732
1832
1931
2031
2131
2231
2330
2430
2530
2629
2729
2828
2928
3027
3127

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the comfortable band about 25% of days. Sticky, muggy-or-worse air turns up on roughly 32% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
114252524121
214252524111
314262524110
415262524110
515262523110
615262523110
716252523110
816252523110
917252522110
1017252522110
1118252522100
1218252522100
1318262522100
1418262522100
1518252522100
161825252290
171825252390
181825252390
191725252390
201725252490
211725252490
221825252490
231825252490
241825252480
251925252380
261925242380
272025242280
282126242280
292226232170
302326232170
312427222070

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
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 18 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 78 minutes over August. Sunrise moves from 4:52 AM to 5:24 AM, and sunset from 7:11 PM to 6:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.34:527:11
214.34:537:10
314.24:547:09
414.24:557:08
514.24:567:06
614.14:577:05
714.14:587:04
814.14:597:03
914.05:007:01
1014.05:017:00
1113.95:026:59
1213.95:036:57
1313.95:046:56
1413.85:056:54
1513.85:076:53
1613.75:086:51
1713.75:096:50
1813.65:106:48
1913.65:116:47
2013.65:126:45
2113.55:136:44
2213.55:146:42
2313.45:156:40
2413.45:166:39
2513.35:176:37
2613.35:186:35
2713.25:206:34
2813.25:216:32
2913.15:226:30
3013.15:236:29
3113.05:246:27

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.38 kWh/m².

For context, solar energy here swings from a low near 1.65 kWh/m² to a high of 6.29 kWh/m² in June across the year — August's 5.38 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.8Bright
35.8Bright
45.8Bright
55.7Bright
65.7Bright
75.7Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.4Bright
145.4Bright
155.4Bright
165.4Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.1Bright
265.1Bright
275.1Bright
285.1Bright
295.0Bright
305.0Bright
315.0Bright
Planning a trip in August

Is August a good time to visit Belvidere?

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

6.7
Sightseeing
2nd-best month of the year
6.6
Beach & pool
2nd-best month of the year

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

What to pack for Belvidere in August

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

In August, Belvidere sees daytime highs around 80°F and nights near 62°F. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Belvidere 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 Belvidere peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 19UV 9Dec 20UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Belvidere 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 Belvidere is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJul 1817 µg/m³Oct 229 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar16Moderate
Apr14Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug16Moderate
Sep13Moderate
Oct9Good
Nov10Good
Dec11Good
Location & terrain

Where is Belvidere?

Belvidere sits at 42.3°N, 88.8°W, 781 ft above sea level, in United States. The nearest listed city is Machesney Park, 11 mi away.

Topography around Belvidere

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

Within 2 miles, the terrain around Belvidere has only modest variations in elevation — a maximum elevation change of 131 ft around an average of 784 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 325 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 679 ft.

The land around Belvidere is covered by cropland (27%), artificial surfaces (25%) and grassland (24%) within 2 miles, cropland (62%) within 10 miles, and cropland (60%) and trees (20%) within 50 miles.

2 miles
131 ft
10 miles
325 ft
50 miles
679 ft
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Machesney Park 11 mi · Loves Park 12 mi · Rockford 13 mi · Beloit 19 mi · Woodstock 21 mi · Sycamore 21 mi · Huntley 22 mi · DeKalb 24 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 Belvidere (42.2639°, -88.8443°, elevation 781 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).