May weather in Union, IL
The average temperature in Union in May is 58.7°F (47.2°F–70.2°F). Average precipitation: 4.57 inches.
May is a spring month in Union, and is warmer than the annual average of 48.2°F. Daily temperatures swing about 23°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 14h 24m. For travel, May is a comfortable month to visit.
Avg High
70.2°F
Avg Low
47.2°F
Precipitation
4.57 in
Daylight
14h 24m
May records in Union
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 89.1°F (1952) | 25.0°F (1963) | 1.13 in (1940) |
| May 2 | 90.0°F (1901) | 26.1°F (1966) | 0.75 in (1910) |
| May 3 | 89.1°F (1928) | 27.0°F (1971) | 1.95 in (1919) |
| May 4 | 91.9°F (1959) | 26.1°F (1907) | 0.96 in (1990) |
| May 5 | 93.0°F (1949) | 28.9°F (1944) | 1.20 in (2003) |
| May 6 | 91.0°F (1934) | 21.0°F (2014) | 1.65 in (1948) |
| May 7 | 89.1°F (1926) | 26.1°F (1989) | 0.94 in (2009) |
| May 8 | 89.1°F (1963) | 26.1°F (1947) | 1.15 in (1974) |
| May 9 | 95.0°F (1934) | 26.1°F (1966) | 2.45 in (1927) |
| May 10 | 91.0°F (1922) | 21.9°F (1966) | 2.06 in (1996) |
| May 11 | 91.0°F (2011) | 26.1°F (1907) | 3.33 in (1905) |
| May 12 | 89.1°F (1987) | 28.0°F (1938) | 1.36 in (2002) |
| May 13 | 88.0°F (1900) | 12.9°F (1995) | 3.35 in (2010) |
| May 14 | 90.0°F (1932) | 28.9°F (1895) | 1.74 in (1945) |
| May 15 | 90.0°F (2007) | 32.0°F (2016) | 0.80 in (1915) |
| May 16 | 91.0°F (1962) | 32.0°F (1997) | 1.35 in (1974) |
| May 17 | 91.0°F (1934) | 28.0°F (2014) | 1.05 in (1974) |
| May 18 | 93.9°F (1934) | 30.9°F (1925) | 1.45 in (1986) |
| May 19 | 96.1°F (1934) | 30.9°F (1929) | 1.42 in (1938) |
| May 20 | 95.0°F (1934) | 30.0°F (1895) | 2.00 in (1996) |
| May 21 | 93.0°F (1934) | 32.0°F (1895) | 2.04 in (1996) |
| May 22 | 93.0°F (1925) | 33.1°F (1971) | 1.54 in (2004) |
| May 23 | 91.0°F (1921) | 27.0°F (1963) | 1.50 in (2011) |
| May 24 | 91.9°F (1921) | 33.1°F (1947) | 0.82 in (1927) |
| May 25 | 91.9°F (2010) | 28.9°F (1925) | 2.80 in (1896) |
| May 26 | 96.1°F (1967) | 30.9°F (1961) | 1.98 in (1933) |
| May 27 | 93.9°F (1985) | 30.9°F (1992) | 1.92 in (2009) |
| May 28 | 96.1°F (2012) | 32.0°F (1949) | 1.48 in (1935) |
| May 29 | 95.0°F (2018) | 32.0°F (1965) | 1.57 in (1980) |
| May 30 | 95.0°F (2018) | 35.1°F (1996) | 0.88 in (2011) |
| May 31 | 107.1°F (1934) | 34.0°F (1897) | 1.68 in (2004) |