Wheaton Weather in May
Average highs run from 62°F on May 1 to 74°F on May 31, and lows from 40°F to 54°F. Normal precipitation for the month is 2.80 in over about 9 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 69°F
- Average low
- 47°F
- Precipitation
- 2.80 in
- Record high
- 106°FMay 31, 1934
- Record low
- 14°FMay 6, 1925
- Chance of a freeze
- 52%
- Days of 90°F or more
- 1.0
- Daylight
- 14 h 21 min to 15 h 28 min
- Cloud cover
- 64%
- Humidity
- 64%
- Dew point
- 44°F
- Wind
- 12.1 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| May 1 | 62°F | 40°F | 99°F 1959 | 21°F 1961 | 27% | |
| May 2 | 63°F | 40°F | 99°F 1959 | 21°F 1967 | 27% | |
| May 3 | 63°F | 41°F | 91°F 1952 | 21°F 1967 | 28% | |
| May 4 | 64°F | 41°F | 96°F 1949 | 22°F 1967 | 28% | |
| May 5 | 64°F | 42°F | 94°F 1939 | 23°F 1929 | 28% | |
| May 6 | 64°F | 42°F | 93°F 2000 | 14°F 1925 | 29% | |
| May 7 | 65°F | 43°F | 91°F 1916 | 24°F 1929 | 29% | |
| May 8 | 65°F | 43°F | 100°F 1934 | 17°F 1923 | 29% | |
| May 9 | 66°F | 44°F | 96°F 1934 | 21°F 1925 | 29% | |
| May 10 | 66°F | 44°F | 90°F 1985 | 23°F 1981 | 29% | |
| May 11 | 67°F | 45°F | 89°F 1985 | 18°F 1946 | 29% | |
| May 12 | 67°F | 45°F | 93°F 1940 | 19°F 1946 | 30% | |
| May 13 | 67°F | 46°F | 92°F 1932 | 21°F 2004 | 30% | |
| May 14 | 68°F | 46°F | 97°F 2001 | 28°F 1921 | 30% | |
| May 15 | 68°F | 47°F | 96°F 2001 | 25°F 1921 | 30% | |
| May 16 | 69°F | 47°F | 100°F 1934 | 24°F 1923 | 30% | |
| May 17 | 69°F | 48°F | 93°F 1934 | 25°F 1930 | 30% | |
| May 18 | 70°F | 48°F | 95°F 1939 | 27°F 1924 | 30% | |
| May 19 | 70°F | 48°F | 94°F 2012 | 32°F 1915 | 30% | |
| May 20 | 70°F | 49°F | 92°F 1934 | 30°F 1929 | 30% | |
| May 21 | 71°F | 49°F | 98°F 1964 | 31°F 1963 | 31% | |
| May 22 | 71°F | 50°F | 97°F 1964 | 28°F 1924 | 31% | |
| May 23 | 71°F | 50°F | 93°F 1928 | 31°F 1924 | 31% | 0% |
| May 24 | 72°F | 51°F | 94°F 1950 | 28°F 1924 | 31% | 0% |
| May 25 | 72°F | 51°F | 92°F 2010 | 30°F 1924 | 31% | 0% |
| May 26 | 73°F | 52°F | 92°F 2026 | 32°F 1971 | 31% | 0% |
| May 27 | 73°F | 52°F | 97°F 1969 | 32°F 1917 | 31% | 0% |
| May 28 | 73°F | 53°F | 105°F 1934 | 30°F 1928 | 32% | 0% |
| May 29 | 74°F | 53°F | 97°F 1937 | 34°F 1947 | 32% | 0% |
| May 30 | 74°F | 53°F | 105°F 1934 | 34°F 1924 | 32% | 0% |
| May 31 | 74°F | 54°F | 106°F 1934 | 35°F 1964 | 32% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- May 1
- sunrise 6:13 AM, sunset 8:34 PM
- May 31
- sunrise 5:40 AM, sunset 9:08 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00218907 (Wheaton), public domain. Records: NOAA GHCN-Daily, station USC00218907, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.