May weather in Harrisburg, IL
The average temperature in Harrisburg in May is 67.3°F (56.5°F–78.2°F). Average precipitation: 4.31 inches.
May is a spring month in Harrisburg, and is warmer than the annual average of 57.3°F. Daily temperatures swing about 21.7°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 14h 2m. For travel, May is a comfortable month to visit.
Avg High
78.2°F
Avg Low
56.5°F
Precipitation
4.31 in
Daylight
14h 2m
May records in Harrisburg
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 91.9°F (1901) | 28.9°F (1963) | 2.38 in (1962) |
| May 2 | 93.0°F (1952) | 32.0°F (1963) | 3.55 in (2011) |
| May 3 | 91.9°F (1901) | 28.0°F (2005) | 1.56 in (1997) |
| May 4 | 95.0°F (1959) | 32.0°F (1940) | 1.01 in (1993) |
| May 5 | 96.1°F (1959) | 34.0°F (1907) | 1.40 in (1933) |
| May 6 | 93.0°F (1949) | 34.0°F (1968) | 2.97 in (1905) |
| May 7 | 93.9°F (1934) | 30.9°F (1944) | 3.65 in (1961) |
| May 8 | 91.0°F (1966) | 35.1°F (1928) | 1.96 in (1961) |
| May 9 | 91.9°F (1934) | 33.1°F (1960) | 3.00 in (2024) |
| May 10 | 91.0°F (1979) | 33.1°F (1966) | 2.87 in (1950) |
| May 11 | 90.0°F (1902) | 34.0°F (1945) | 3.09 in (1918) |
| May 12 | 96.1°F (2022) | 35.1°F (1960) | 4.00 in (1918) |
| May 13 | 95.0°F (1915) | 35.1°F (1960) | 2.05 in (2002) |
| May 14 | 97.0°F (1915) | 37.0°F (1910) | 2.42 in (1983) |
| May 15 | 93.0°F (1915) | 37.9°F (1973) | 2.88 in (1923) |
| May 16 | 93.0°F (1962) | 36.0°F (1997) | 1.83 in (1948) |
| May 17 | 96.1°F (1962) | 39.9°F (1997) | 1.94 in (1995) |
| May 18 | 96.1°F (1962) | 37.9°F (2002) | 6.25 in (1969) |
| May 19 | 93.9°F (1964) | 39.0°F (1976) | 1.51 in (2001) |
| May 20 | 93.9°F (1962) | 41.0°F (1954) | 2.42 in (1898) |
| May 21 | 95.0°F (1941) | 36.0°F (1954) | 1.07 in (2001) |
| May 22 | 96.1°F (1925) | 41.0°F (1924) | 7.38 in (1957) |
| May 23 | 93.9°F (1921) | 37.0°F (1963) | 2.22 in (1957) |
| May 24 | 95.0°F (1939) | 41.0°F (1913) | 1.99 in (1981) |
| May 25 | 98.1°F (1911) | 34.0°F (1925) | 1.15 in (2011) |
| May 26 | 98.1°F (1911) | 37.9°F (1925) | 1.95 in (1981) |
| May 27 | 98.1°F (1911) | 33.1°F (1961) | 3.40 in (1973) |
| May 28 | 100.0°F (1911) | 39.9°F (1902) | 1.43 in (1996) |
| May 29 | 98.1°F (1911) | 39.0°F (1964) | 2.67 in (1972) |
| May 30 | 99.0°F (1913) | 39.0°F (1947) | 1.80 in (2025) |
| May 31 | 99.0°F (1934) | 39.0°F (1930) | 4.10 in (1997) |