Belleville weather in April

In April, Belleville sees average daytime highs of 67°F and overnight lows near 48°F, with 4.8 in of precipitation across 11.5 wet days and about 13 hours of daylight. It is the 7th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 63°F in the first days to 70°F by the end. The sky is clear or mostly clear about 30% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of April to 13 h 30 min by month's end. Set against the rest of the year, April is Belleville's 7th-clearest and 1st-windiest month. For the whole year in context, see Belleville's year-round climate.

Daytime high
67°
7th warmest
Overnight low
48°
6th coldest
Precipitation
4.8 in
11.5 wet days
Daylight
13 hours
5:30 AM – 6:30 PM
Cloud cover
60%
7th clearest
Wind
8 mph
1st windiest
Solar energy
5.21 kWh/m²
Travel score
5.9
out of 10

Belleville is city in and seat of St. Clair County, Illinois, United States.

Density
691/km²
people per km²
Founded
1814

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 63°F in the first days to 70°F by the end.

A typical April day in Belleville reaches about 67°F in the afternoon and slips back to 48°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 54°F and 80°F. Set against its neighbours, April runs about 11°F warmer than March and about 9°F cooler than May.

20°40°60°80°151015202530
Avg high (°F)Avg low (°F)
16243
26344
36344
46444
56444
66445
76545
86546
96546
106646
116647
126647
136747
146748
156748
166848
176849
186849
196849
206949
216950
226950
236950
246951
257051
267051
277052
287052
297152
307153

How April really feels in Belleville

Once humidity and wind are folded in, April 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

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

Belleville weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan40° / 25°2.98.32.99.60.0
Feb45° / 29°2.67.62.610.51.0
Mar56° / 38°3.810.81.311.73.7
Apr67° / 48°4.811.50.1135.9
May76° / 58°5.113.3014.16.3
Jun85° / 67°4.110.8014.65.2
Jul88° / 71°3.49.8014.44.6
Aug86° / 68°2.99.1013.55.1
Sep80° / 60°3.27.6012.37.0
Oct68° / 49°3.58.40116.7
Nov55° / 38°3.78.70.69.93.6
Dec44° / 29°2.88.529.40.7

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24357
34456
44555
54654
64654
74654
84654
94753
104654
114753
124654
134753
144654
154654
164555
174555
184555
194456
204357
214456
224357
234357
244357
254258
264258
274258
284258
294357
304159

Chance of precipitation in April

Any precipitationSnow

Belleville gets around 4.8 in of rain and snow over 11.5 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 39% and peaks near 45% on the wettest days, and about 0 day brings snow. The odds climb toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)Snow chance (%)
1372
2371
3371
4361
5361
6361
7361
8361
9361
10361
11360
12360
13360
14360
15370
16370
17380
18390
19390
20400
21410
22410
23420
24430
25440
26440
27450
28450
29450
30450

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the dry band about 83% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
191630
291630
390640
490640
589740
689740
788750
887850
987850
1085960
1185960
1285960
13841060
14841060
15831160
16831160
17821260
18831250
19821350
20821350
21821350
22811450
23801460
24791560
25791560
26781660
27761671
28751771
29741781
30721891

Wind in April

Winds average 8 mph in April, the windiest month of the year.

Across April, 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.

051015151015202530
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light 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

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over April. Sunrise moves from 5:53 AM to 5:11 AM, and sunset from 6:16 PM to 6:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:536:16
212.45:526:17
312.55:506:18
412.55:496:19
512.55:476:20
612.65:456:21
712.65:446:22
812.75:426:23
912.75:416:23
1012.85:396:24
1112.85:386:25
1212.85:366:26
1312.95:356:27
1412.95:336:28
1513.05:326:29
1613.05:306:30
1713.05:296:31
1813.15:276:32
1913.15:266:33
2013.25:246:34
2113.25:236:35
2213.25:216:36
2313.35:206:37
2413.35:196:38
2513.45:176:39
2613.45:166:40
2713.45:156:41
2813.55:136:42
2913.55:126:43
3013.55:116:44

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.21 kWh/m².

For context, solar energy here swings from a low near 1.91 kWh/m² to a high of 6.47 kWh/m² in June across the year — April's 5.21 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.9Bright
55.0Bright
65.0Bright
75.0Bright
85.1Bright
95.1Bright
105.1Bright
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.4Bright
305.4Bright
Planning a trip in April

Is April a good time to visit Belleville?

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

5.9
Sightseeing
4th-best month of the year
2.8
Beach & pool
7th-best month of the year

April is a reasonable time to visit Belleville for sightseeing.

What to pack for Belleville in April

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

In April, Belleville sees daytime highs around 67°F and nights near 48°F. Worth packing: rain gear and sun protection. About 12 days see rain.

rain gearsun protection

UV index in Belleville in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Belleville 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 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 22UV 9Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5High
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Belleville in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.

Air quality in Belleville is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1418 µg/m³Oct 238 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb12Good
Mar12Good
Apr11Good
May14Moderate
Jun16Moderate
Jul18Moderate
Aug15Moderate
Sep12Moderate
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Belleville?

Belleville sits at 38.5°N, 90.0°W, 515 ft above sea level, in United States. The nearest listed city is Fairview Heights, 5.0 mi away.

Topography around Belleville

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

Within 2 miles, the terrain around Belleville has only modest variations in elevation — a maximum elevation change of 128 ft around an average of 528 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 364 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 981 ft.

The land around Belleville is covered by trees (54%) and artificial surfaces (28%) within 2 miles, trees (39%) and cropland (38%) within 10 miles, and cropland (44%) and trees (42%) within 50 miles.

2 miles
128 ft
10 miles
364 ft
50 miles
981 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Fairview Heights 5.0 mi · O'Fallon 6.2 mi · Collinsville 11 mi · East Saint Louis 12 mi · St. Louis 14 mi · Granite City 16 mi · Lemay 16 mi · Oakville 17 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 Belleville (38.52°, -89.984°, elevation 515 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).