Wheaton weather in May: Wheaton, Illinois: normal highs, lows, rain and records for May
Wheaton in May has a normal high of 74°F and a normal low of 49°F, a daily mean of 61°F, rising from 69°F on the 1st to 78°F by the 31st. Measurable precipitation falls on 12 days in a normal May, 4.46 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 9°C, 113 mm of precipitation in May.
- NOAA stationWheaton (3 mi SE)
- Station IDUSC00119221
- Location41.81°N 88.07°W
- Elevation680 ft (207 m)
- From the center4 miles
- Population53,741
- Jan 33° 17°
- Feb 38° 20°
- Mar 50° 29°
- Apr 63° 38°
- May 74° 49°
- Jun 83° 59°
- Jul 86° 63°
- Aug 84° 62°
- Sep 78° 54°
- Oct 65° 43°
- Nov 50° 32°
- Dec 38° 23°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Wheaton in May?
The normal high is 74°F and the normal low 49°F, for a daily mean of 61.1°F. May is 10.7°F warmer than April and 9.6°F cooler than June. May is the 5th warmest month of the year in Wheaton and the 2nd wettest. Across the month the normal high rises 9°F, from 69°F on May 1 to 78°F on May 31. From one year to the next May's mean temperature typically moves about 3.2°F either way (NOAA's standard deviation), so roughly two Mays in three average between 58°F and 64°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 40%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 69°F | 44°F | 40% | 24% |
| May 8 | 71°F | 46°F | 40% | 25% |
| May 15 | 73°F | 48°F | 40% | 25% |
| May 22 | 76°F | 51°F | 39% | 26% |
| May 31 | 78°F | 53°F | 38% | 26% |
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 | 69°F | 44°F | 40% | 24% | 14 h |
| May 2 | 69°F | 44°F | 40% | 24% | 14 h |
| May 3 | 70°F | 45°F | 40% | 24% | 14 h |
| May 4 | 70°F | 45°F | 40% | 24% | 14 h 10 min |
| May 5 | 70°F | 45°F | 40% | 24% | 14 h 10 min |
| May 6 | 71°F | 46°F | 40% | 24% | 14 h 10 min |
| May 7 | 71°F | 46°F | 40% | 24% | 14 h 10 min |
| May 8 | 71°F | 46°F | 40% | 25% | 14 h 20 min |
| May 9 | 71°F | 47°F | 40% | 25% | 14 h 20 min |
| May 10 | 72°F | 47°F | 40% | 25% | 14 h 20 min |
| May 11 | 72°F | 47°F | 40% | 25% | 14 h 20 min |
| May 12 | 72°F | 48°F | 40% | 25% | 14 h 20 min |
| May 13 | 73°F | 48°F | 40% | 25% | 14 h 30 min |
| May 14 | 73°F | 48°F | 40% | 25% | 14 h 30 min |
| May 15 | 73°F | 48°F | 40% | 25% | 14 h 30 min |
| May 16 | 74°F | 49°F | 40% | 25% | 14 h 30 min |
| May 17 | 74°F | 49°F | 40% | 25% | 14 h 30 min |
| May 18 | 74°F | 49°F | 40% | 25% | 14 h 40 min |
| May 19 | 75°F | 50°F | 40% | 25% | 14 h 40 min |
| May 20 | 75°F | 50°F | 39% | 25% | 14 h 40 min |
| May 21 | 75°F | 50°F | 39% | 26% | 14 h 40 min |
| May 22 | 76°F | 51°F | 39% | 26% | 14 h 40 min |
| May 23 | 76°F | 51°F | 39% | 26% | 14 h 50 min |
| May 24 | 76°F | 51°F | 39% | 26% | 14 h 50 min |
| May 25 | 76°F | 51°F | 39% | 26% | 14 h 50 min |
| May 26 | 77°F | 52°F | 39% | 26% | 14 h 50 min |
| May 27 | 77°F | 52°F | 39% | 26% | 14 h 50 min |
| May 28 | 77°F | 52°F | 38% | 26% | 14 h 50 min |
| May 29 | 78°F | 53°F | 38% | 26% | 15 h |
| May 30 | 78°F | 53°F | 38% | 26% | 15 h |
| May 31 | 78°F | 53°F | 38% | 26% | 15 h |
- Normal high
- 74°FMay average
- Normal low
- 49°FMay average
- Precipitation
- 4.46 inmonth total
- Days with precipitation
- 120.01 inch or more
- Days at 90°F or more
- 2
- Nights at 32°F or colder
- 1
- Daylight
- 14 h to 15 hMay 1 to May 31
- Days at 70°F or more
- 21
- Days at 80°F or more
- 10
- Sunshine
- 71%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00119221; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Wheaton in May?
On a given May day the chance of 0.01 inch or more is 40% on average, highest around May 6 (40%). In all, 4.46 in falls on 12 days of a normal May, 1 of them with an inch or more.
In a normal May in Wheaton, 2 days reach 90°F and 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00119221.
What are the records for May in Wheaton?
The warmest May temperature on this station's record (since 1895) is 97°F, on May 29, 2018; the coldest is 22°F, on May 3, 2013. The wettest May brought 10.73 in (2019); the snowiest, 2.0 inches (1966).
The May mean against the 1991-2020 normal of 61.1°F: 2021 57.8°F (−3.3), 2023 58.7°F (−2.4), 2024 62.4°F (+1.3), 2025 56.6°F (−4.5), 2026 60.2°F (−0.9). 1 of 5 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 57.8°F | −3.3°F | 3.34 in |
| 2023 | 58.7°F | −2.4°F | 0.93 in |
| 2024 | 62.4°F | +1.3°F | 3.73 in |
| 2025 | 56.6°F | −4.5°F | 1.86 in |
| 2026 | 60.2°F | −0.9°F | 1.78 in |
Source: records: ACIS, station USC00119221; recent months: ACIS, station USC00119221. Records and recent months use complete months only.
How does May in Wheaton 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; Wheaton's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.