May weather in Vandalia, IL
The average temperature in Vandalia in May is 64.6°F (54.2°F–74.9°F). Average precipitation: 5.30 inches.
May is a spring month in Vandalia, and is warmer than the annual average of 54.2°F. Daily temperatures swing about 20.7°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 14h 8m. For travel, May is a wet month.
Avg High
74.9°F
Avg Low
54.2°F
Precipitation
5.30 in
Daylight
14h 8m
May records in Vandalia
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 89.1°F (2007) | 28.0°F (1903) | 2.33 in (1946) |
| May 2 | 89.1°F (1901) | 34.0°F (1978) | 1.40 in (1985) |
| May 3 | 89.1°F (1902) | 34.0°F (1976) | 0.88 in (1942) |
| May 4 | 87.1°F (1902) | 30.9°F (1976) | 0.79 in (1987) |
| May 5 | 86.0°F (2001) | 37.9°F (2005) | 2.20 in (1996) |
| May 6 | 87.1°F (2012) | 36.0°F (1992) | 1.41 in (1900) |
| May 7 | 90.0°F (2012) | 36.0°F (1976) | 3.26 in (1943) |
| May 8 | 84.0°F (2007) | 35.1°F (1976) | 3.36 in (1995) |
| May 9 | 87.1°F (1993) | 33.1°F (1983) | 1.05 in (2008) |
| May 10 | 90.0°F (1979) | 33.1°F (1900) | 1.30 in (1949) |
| May 11 | 87.1°F (2005) | 39.9°F (1977) | 1.94 in (2006) |
| May 12 | 90.0°F (1902) | 37.9°F (1981) | 1.57 in (2010) |
| May 13 | 89.1°F (1985) | 35.1°F (1901) | 2.95 in (2002) |
| May 14 | 89.1°F (1900) | 39.0°F (1996) | 1.30 in (2009) |
| May 15 | 90.0°F (1998) | 39.0°F (1904) | 1.45 in (1945) |
| May 16 | 91.0°F (2001) | 32.0°F (1901) | 2.33 in (1990) |
| May 17 | 91.9°F (2001) | 37.9°F (1901) | 1.83 in (1995) |
| May 18 | 90.0°F (1902) | 36.0°F (2002) | 1.86 in (1981) |
| May 19 | 90.0°F (1996) | 39.0°F (2002) | 0.98 in (1938) |
| May 20 | 93.0°F (1902) | 37.9°F (1983) | 2.02 in (1933) |
| May 21 | 93.0°F (1902) | 39.0°F (2002) | 1.48 in (2012) |
| May 22 | 91.0°F (1902) | 39.0°F (1997) | 1.77 in (1998) |
| May 23 | 90.0°F (1975) | 37.9°F (1983) | 1.81 in (1938) |
| May 24 | 90.0°F (2010) | 42.1°F (1905) | 2.09 in (1933) |
| May 25 | 91.0°F (2010) | 39.9°F (1976) | 1.66 in (2006) |
| May 26 | 90.0°F (1977) | 32.0°F (1983) | 2.87 in (1990) |
| May 27 | 91.9°F (1985) | 35.1°F (1983) | 2.33 in (2000) |
| May 28 | 93.0°F (2012) | 37.9°F (1902) | 3.15 in (1900) |
| May 29 | 93.9°F (2012) | 37.0°F (1901) | 0.54 in (1997) |
| May 30 | 93.9°F (2012) | 39.0°F (1984) | 1.90 in (1904) |
| May 31 | 91.0°F (2006) | 42.1°F (1901) | 5.24 in (1944) |