Saint Charles Weather in May
Average highs run from 71°F on May 1 to 77°F on May 31, and lows from 48°F to 56°F. Normal precipitation for the month is 4.32 in over about 11 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
- 74°F
- Average low
- 52°F
- Precipitation
- 4.32 in
- Record high
- 97°FMay 31, 1991
- Record low
- 28°FMay 11, 1966
- Chance of a freeze
- 12%
- Days of 90°F or more
- 0.6
- Daylight
- 13 h 50 min to 14 h 40 min
- Cloud cover
- 60%
- Humidity
- 76%
- Dew point
- 56°F
- Wind
- 5.8 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 | 71°F | 48°F | 89°F 1974 | 35°F 1971 | 35% | 0% |
| May 2 | 71°F | 48°F | 90°F 2010 | 32°F 1960 | 35% | 0% |
| May 3 | 72°F | 48°F | 88°F 2010 | 33°F 1960 | 35% | 0% |
| May 4 | 72°F | 49°F | 90°F 1965 | 29°F 1986 | 35% | 0% |
| May 5 | 72°F | 49°F | 90°F 2001 | 31°F 1957 | 36% | 0% |
| May 6 | 72°F | 49°F | 88°F 1980 | 37°F 1979 | 36% | 0% |
| May 7 | 72°F | 50°F | 90°F 1966 | 32°F 1968 | 36% | 0% |
| May 8 | 72°F | 50°F | 92°F 2000 | 31°F 1974 | 36% | 0% |
| May 9 | 72°F | 50°F | 93°F 2000 | 31°F 1976 | 36% | 0% |
| May 10 | 73°F | 50°F | 95°F 1963 | 32°F 1962 | 36% | 0% |
| May 11 | 73°F | 51°F | 93°F 1963 | 28°F 1966 | 36% | 0% |
| May 12 | 73°F | 51°F | 90°F 2004 | 35°F 1969 | 36% | 0% |
| May 13 | 73°F | 51°F | 92°F 1959 | 33°F 1976 | 36% | 0% |
| May 14 | 73°F | 52°F | 93°F 1956 | 33°F 2013 | 36% | 0% |
| May 15 | 73°F | 52°F | 95°F 1956 | 38°F 1984 | 36% | 0% |
| May 16 | 74°F | 52°F | 94°F 1962 | 36°F 1973 | 36% | 0% |
| May 17 | 74°F | 52°F | 91°F 1998 | 29°F 1956 | 36% | 0% |
| May 18 | 74°F | 53°F | 91°F 1974 | 35°F 1973 | 36% | 0% |
| May 19 | 74°F | 53°F | 95°F 1962 | 38°F 1956 | 36% | 0% |
| May 20 | 74°F | 53°F | 95°F 1962 | 40°F 1976 | 36% | 0% |
| May 21 | 74°F | 53°F | 94°F 1962 | 34°F 1992 | 36% | 0% |
| May 22 | 75°F | 54°F | 92°F 1996 | 34°F 2002 | 36% | 0% |
| May 23 | 75°F | 54°F | 91°F 1984 | 38°F 1990 | 36% | 0% |
| May 24 | 75°F | 54°F | 92°F 1964 | 34°F 1963 | 36% | 0% |
| May 25 | 75°F | 55°F | 90°F 2004 | 33°F 1956 | 36% | 0% |
| May 26 | 76°F | 55°F | 93°F 1991 | 37°F 1956 | 36% | 0% |
| May 27 | 76°F | 55°F | 92°F 1957 | 39°F 1958 | 36% | 0% |
| May 28 | 76°F | 55°F | 94°F 1965 | 38°F 1961 | 36% | 0% |
| May 29 | 76°F | 56°F | 92°F 2012 | 42°F 1997 | 36% | 0% |
| May 30 | 77°F | 56°F | 95°F 1969 | 41°F 1996 | 36% | 0% |
| May 31 | 77°F | 56°F | 97°F 1991 | 39°F 1961 | 36% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- May 1
- sunrise 6:10 AM, sunset 8:00 PM
- May 31
- sunrise 5:46 AM, sunset 8:26 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00185865 (Mechanicsville 5 Ne), public domain. Records: NOAA GHCN-Daily, station USC00189070, 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.