Belleville weather in May: Belleville, Illinois: normal highs, lows, rain and records for May
Belleville in May has a normal high of 79°F and a normal low of 56°F, a daily mean of 68°F, rising from 75°F on the 1st to 84°F by the 31st. Measurable precipitation falls on 12 days in a normal May, 5.05 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 13°C, 128 mm of precipitation in May.
- NOAA stationBelleville Siu Research
- Station IDUSW00013802
- Location38.52°N 89.85°W
- Elevation450 ft (137 m)
- From the center8 miles
- Population40,560
- Jan 43° 24°
- Feb 49° 28°
- Mar 59° 36°
- Apr 71° 46°
- May 79° 56°
- Jun 87° 65°
- Jul 90° 68°
- Aug 89° 65°
- Sep 83° 57°
- Oct 73° 47°
- Nov 58° 37°
- Dec 46° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Belleville in May?
The normal high is 79°F and the normal low 56°F, for a daily mean of 67.7°F. May is 9.4°F warmer than April and 8.2°F cooler than June. May is the 5th warmest month of the year in Belleville and the wettest. Across the month the normal high rises 9°F, from 75°F on May 1 to 84°F on May 31. From one year to the next May's mean temperature typically moves about 2.9°F either way (NOAA's standard deviation), so roughly two Mays in three average between 65°F and 71°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 38%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 75°F | 52°F | 38% | 28% |
| May 8 | 77°F | 54°F | 38% | 28% |
| May 15 | 79°F | 56°F | 37% | 27% |
| May 22 | 81°F | 58°F | 35% | 26% |
| May 31 | 84°F | 61°F | 33% | 24% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 75°F | 52°F | 38% | 28% | 13 h 50 min |
| May 2 | 75°F | 52°F | 38% | 28% | 13 h 50 min |
| May 3 | 76°F | 52°F | 38% | 28% | 13 h 50 min |
| May 4 | 76°F | 53°F | 38% | 28% | 13 h 50 min |
| May 5 | 76°F | 53°F | 38% | 28% | 13 h 50 min |
| May 6 | 76°F | 53°F | 38% | 28% | 14 h |
| May 7 | 77°F | 54°F | 38% | 28% | 14 h |
| May 8 | 77°F | 54°F | 38% | 28% | 14 h |
| May 9 | 77°F | 54°F | 38% | 28% | 14 h |
| May 10 | 77°F | 55°F | 38% | 28% | 14 h |
| May 11 | 78°F | 55°F | 38% | 28% | 14 h 10 min |
| May 12 | 78°F | 55°F | 37% | 27% | 14 h 10 min |
| May 13 | 78°F | 56°F | 37% | 27% | 14 h 10 min |
| May 14 | 78°F | 56°F | 37% | 27% | 14 h 10 min |
| May 15 | 79°F | 56°F | 37% | 27% | 14 h 10 min |
| May 16 | 79°F | 56°F | 37% | 27% | 14 h 20 min |
| May 17 | 79°F | 57°F | 36% | 27% | 14 h 20 min |
| May 18 | 80°F | 57°F | 36% | 26% | 14 h 20 min |
| May 19 | 80°F | 57°F | 36% | 26% | 14 h 20 min |
| May 20 | 80°F | 58°F | 36% | 26% | 14 h 20 min |
| May 21 | 81°F | 58°F | 35% | 26% | 14 h 20 min |
| May 22 | 81°F | 58°F | 35% | 26% | 14 h 30 min |
| May 23 | 81°F | 59°F | 35% | 25% | 14 h 30 min |
| May 24 | 81°F | 59°F | 35% | 25% | 14 h 30 min |
| May 25 | 82°F | 59°F | 34% | 25% | 14 h 30 min |
| May 26 | 82°F | 59°F | 34% | 25% | 14 h 30 min |
| May 27 | 82°F | 60°F | 34% | 25% | 14 h 30 min |
| May 28 | 83°F | 60°F | 34% | 25% | 14 h 30 min |
| May 29 | 83°F | 60°F | 33% | 25% | 14 h 40 min |
| May 30 | 83°F | 61°F | 33% | 25% | 14 h 40 min |
| May 31 | 84°F | 61°F | 33% | 24% | 14 h 40 min |
- Normal high
- 79°FMay average
- Normal low
- 56°FMay average
- Precipitation
- 5.05 inmonth total
- Days with precipitation
- 120.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 13 h 50 min to 14 h 40 minMay 1 to May 31
- Days at 70°F or more
- 27
- Days at 80°F or more
- 16
- Sunshine
- 74%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013802; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Belleville in May?
On a given May day the chance of 0.01 inch or more is 36% on average, highest around May 3 (38%). In all, 5.05 in falls on 12 days of a normal May, 2 of them with an inch or more.
In a normal May in Belleville, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013802.
How humid and windy is Belleville in May?
At 3 p.m. the normal temperature is 79°F with 54% relative humidity and a dew point of 61°F; at 6 a.m. it is 64°F with 89% humidity. The wind averages 6.4 mph, most often from the southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 64°F | 61°F | 89% | 4.4 mph | 47% |
| 9 a.m. | 73°F | 62°F | 68% | 8.0 mph | 47% |
| noon | 77°F | 61°F | 58% | 8.8 mph | 34% |
| 3 p.m. | 79°F | 61°F | 54% | 9.4 mph | 40% |
| 6 p.m. | 76°F | 61°F | 59% | 7.9 mph | 49% |
| 9 p.m. | 69°F | 62°F | 78% | 4.6 mph | 54% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013802. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for May in Belleville?
The warmest May temperature on this station's record (since 1948) is 97°F, on May 26, 1953; the coldest is 28°F, on May 4, 1976. The wettest May brought 17.02 in (1995).
The May mean against the 1991-2020 normal of 67.7°F: 2021 62.7°F (−5.0), 2023 65.8°F (−1.9), 2024 69.1°F (+1.4), 2025 65.9°F (−1.8), 2026 66.8°F (−0.9). 1 of 5 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 62.7°F | −5.0°F | 2.76 in |
| 2023 | 65.8°F | −1.9°F | 2.32 in |
| 2024 | 69.1°F | +1.4°F | 5.56 in |
| 2025 | 65.9°F | −1.8°F | – |
| 2026 | 66.8°F | −0.9°F | – |
Source: records: ACIS, station USW00013802; recent months: ACIS, station USW00013802. Records and recent months use complete months only.
How does May in Belleville compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, May normal highs run from 67°F in Waukegan to 79°F in Belleville; Belleville's is 79°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.