May weather in St. Charles, MO
The average temperature in St. Charles in May is 65.5°F (55.1°F–76.0°F). Average precipitation: 5.45 inches.
May is a spring month in St. Charles, and is warmer than the annual average of 55.5°F. Daily temperatures swing about 20.9°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 14h 7m. For travel, May is a wet month.
Avg High
76.0°F
Avg Low
55.1°F
Precipitation
5.45 in
Daylight
14h 7m
May records in St. Charles
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 91.0°F (1936) | 0.0°F (1947) | 3.60 in (2019) |
| May 2 | 91.9°F (1952) | 0.0°F (1947) | 2.15 in (1929) |
| May 3 | 93.9°F (1949) | 0.0°F (1947) | 1.51 in (2019) |
| May 4 | 93.0°F (1952) | 0.0°F (1947) | 2.70 in (2017) |
| May 5 | 95.0°F (1952) | 0.0°F (1947) | 1.30 in (1938) |
| May 6 | 91.9°F (1949) | 0.0°F (1947) | 2.10 in (1908) |
| May 7 | 95.0°F (1940) | 0.0°F (1947) | 2.05 in (1943) |
| May 8 | 91.9°F (2023) | 0.0°F (1947) | 2.47 in (1961) |
| May 9 | 93.0°F (1934) | 0.0°F (1947) | 1.17 in (1909) |
| May 10 | 93.0°F (1896) | 0.0°F (1947) | 2.47 in (1949) |
| May 11 | 90.0°F (1914) | 0.0°F (1947) | 2.58 in (1912) |
| May 12 | 95.0°F (1956) | 0.0°F (1947) | 1.87 in (2010) |
| May 13 | 93.0°F (1915) | 0.0°F (1947) | 3.32 in (2002) |
| May 14 | 93.0°F (1944) | 0.0°F (1947) | 2.70 in (1967) |
| May 15 | 93.0°F (1944) | 0.0°F (1947) | 1.78 in (1896) |
| May 16 | 91.9°F (1944) | 0.0°F (1947) | 2.60 in (1990) |
| May 17 | 93.0°F (1944) | 0.0°F (1947) | 4.79 in (1995) |
| May 18 | 93.0°F (1996) | 0.0°F (1947) | 3.11 in (1943) |
| May 19 | 91.9°F (1944) | 0.0°F (1947) | 2.20 in (2018) |
| May 20 | 93.0°F (1902) | 0.0°F (1947) | 1.48 in (1898) |
| May 21 | 95.0°F (1925) | 0.0°F (1947) | 4.17 in (2013) |
| May 22 | 93.0°F (1925) | 0.0°F (1947) | 2.44 in (1949) |
| May 23 | 98.1°F (1932) | 0.0°F (1947) | 1.75 in (1968) |
| May 24 | 93.0°F (1911) | 0.0°F (1947) | 2.20 in (1927) |
| May 25 | 96.1°F (1953) | 0.0°F (1947) | 2.19 in (1968) |
| May 26 | 100.0°F (1953) | 0.0°F (1947) | 3.86 in (1893) |
| May 27 | 95.0°F (1936) | 0.0°F (1947) | 3.56 in (1896) |
| May 28 | 93.9°F (1911) | 0.0°F (1947) | 1.66 in (2004) |
| May 29 | 97.0°F (1934) | 0.0°F (1947) | 3.05 in (1898) |
| May 30 | 100.9°F (1934) | 0.0°F (1947) | 0.88 in (1997) |
| May 31 | 100.9°F (1934) | 0.0°F (1947) | 2.46 in (1974) |