Belvidere weather in May

In May, Belvidere sees average daytime highs of 69°F and overnight lows near 50°F, with 4.4 in of rain across 12.5 wet days and about 14.4 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 64°F in the first days to 73°F by the end. The sky is clear or mostly clear about 25% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 48 min at the start of May to 14 h 48 min by month's end. Set against the rest of the year, May is Belvidere's 6th-clearest and 8th-windiest month. For the whole year in context, see Belvidere's year-round climate.

Daytime high
69°
5th warmest
Overnight low
50°
8th coldest
Rainfall
4.4 in
12.5 wet days
Daylight
14 h 24 min
4:40 AM – 7:03 PM
Cloud cover
64%
6th clearest
Wind
8 mph
8th windiest
Solar energy
5.7 kWh/m²
Travel score
5.9
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 May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 64°F in the first days to 73°F by the end.

A typical May day in Belvidere reaches about 69°F in the afternoon and slips back to 50°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 56°F and 81°F. Set against its neighbours, May runs about 11°F warmer than April and about 10°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
16345
26345
36445
46446
56546
66547
76547
86647
96648
106748
116748
126749
136749
146849
156849
166950
176950
186950
197051
207051
217051
227152
237152
247153
257253
267253
277254
287354
297354
307355
317455

How May really feels in Belvidere

Once humidity and wind are folded in, May 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

May 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 May compares with the rest of the year at a glance. May is the 5th-warmest and 1st-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 May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 61%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23565
33565
43466
53565
63565
73664
83862
93862
103862
113961
124060
134060
144159
154060
164060
174159
184159
194159
204159
214258
224258
234258
244159
254159
264258
274258
284258
294258
304357
314357

Chance of precipitation in May

Any precipitation

Belvidere gets around 4.4 in of rain over 12.5 wet days in May, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 42% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
140
240
341
441
541
641
741
841
941
1041
1141
1241
1340
1440
1540
1640
1741
1841
1941
2041
2141
2241
2341
2441
2541
2641
2742
2842
2942
3042
3141

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 75% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
190721
289821
389821
487931
587931
6861031
7851041
8841042
9821152
10821152
11811162
12811162
13791272
14791272
15781273
16771283
17761383
18741394
19741394
20721495
217114105
227014106
236715117
246715117
256516127
266416128
276317128
286117139
296018139
306018139
3157191410

Wind in May

Winds average 8 mph in May.

Across May, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 48 min at the start of May to 14 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over May. Sunrise moves from 4:58 AM to 4:28 AM, and sunset from 6:47 PM to 7:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.84:586:47
213.94:576:48
313.94:556:49
413.94:546:50
514.04:536:51
614.04:516:53
714.14:506:54
814.14:496:55
914.14:486:56
1014.24:476:57
1114.24:456:58
1214.24:446:59
1314.34:437:00
1414.34:427:01
1514.44:417:02
1614.44:407:03
1714.44:397:04
1814.54:387:05
1914.54:377:06
2014.54:367:07
2114.64:357:08
2214.64:347:09
2314.64:337:10
2414.64:337:11
2514.74:327:12
2614.74:317:13
2714.74:307:14
2814.84:307:15
2914.84:297:16
3014.84:297:17
3114.84:287:18

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.7 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 — May's 5.7 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.4Bright
55.4Bright
65.4Bright
75.4Bright
85.5Bright
95.5Bright
105.5Bright
115.6Bright
125.6Bright
135.6Bright
145.7Bright
155.7Bright
165.7Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.9Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
276.0Bright
286.0Bright
296.0Bright
306.0Intense
316.0Intense
Planning a trip in May

Is May a good time to visit Belvidere?

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

5.9
Sightseeing
5th-best month of the year
3.3
Beach & pool
5th-best month of the year

May is a reasonable time to visit Belvidere for sightseeing.

What to pack for Belvidere in May

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

In May, Belvidere sees daytime highs around 69°F and nights near 50°F. Worth packing: rain gear and sun protection. About 13 days see rain.

rain gearsun protection

UV index in Belvidere in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May 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
May 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).