May weather in South Chicago Heights, IL
The average temperature in South Chicago Heights in May is 60.0°F (49.3°F–70.6°F). Average precipitation: 4.57 inches.
May is a spring month in South Chicago Heights, and is warmer than the annual average of 49.8°F. Daily temperatures swing about 21.3°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 14h 20m. For travel, May is a comfortable month to visit.
Avg High
70.6°F
Avg Low
49.3°F
Precipitation
4.57 in
Daylight
14h 20m
May records in South Chicago Heights
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 86.0°F (2001) | 28.9°F (1963) | 2.22 in (2019) |
| May 2 | 87.1°F (1959) | 28.9°F (1966) | 1.51 in (1983) |
| May 3 | 88.0°F (1955) | 30.0°F (2004) | 1.11 in (1979) |
| May 4 | 87.1°F (1955) | 30.0°F (1954) | 1.44 in (2022) |
| May 5 | 88.0°F (1959) | 30.0°F (1954) | 1.19 in (1977) |
| May 6 | 87.1°F (1980) | 28.9°F (1954) | 1.86 in (1976) |
| May 7 | 88.0°F (2004) | 30.0°F (1976) | 1.85 in (1998) |
| May 8 | 89.1°F (1963) | 30.0°F (1976) | 1.04 in (1998) |
| May 9 | 90.0°F (2014) | 27.0°F (2020) | 2.03 in (2021) |
| May 10 | 87.1°F (2004) | 25.0°F (1966) | 2.45 in (1990) |
| May 11 | 88.0°F (1993) | 35.1°F (1966) | 2.33 in (1966) |
| May 12 | 91.9°F (2022) | 28.0°F (1981) | 3.02 in (2002) |
| May 13 | 91.0°F (2022) | 33.1°F (1960) | 2.04 in (1957) |
| May 14 | 91.0°F (2022) | 33.1°F (2013) | 1.74 in (1970) |
| May 15 | 90.0°F (1982) | 36.0°F (2016) | 1.35 in (2020) |
| May 16 | 91.9°F (2025) | 33.1°F (1984) | 1.21 in (2009) |
| May 17 | 91.0°F (1962) | 35.1°F (1973) | 2.35 in (1974) |
| May 18 | 91.9°F (1964) | 33.1°F (2002) | 1.70 in (2020) |
| May 19 | 91.9°F (1975) | 37.9°F (1954) | 2.30 in (1987) |
| May 20 | 91.9°F (1977) | 32.0°F (1954) | 2.14 in (1959) |
| May 21 | 91.0°F (2012) | 30.9°F (2002) | 1.25 in (2013) |
| May 22 | 93.0°F (1956) | 32.0°F (1963) | 6.43 in (1982) |
| May 23 | 91.0°F (1964) | 34.0°F (1963) | 1.29 in (1984) |
| May 24 | 91.9°F (2000) | 33.1°F (1956) | 1.32 in (1988) |
| May 25 | 93.0°F (2010) | 36.0°F (1961) | 0.95 in (1989) |
| May 26 | 93.0°F (1967) | 36.0°F (1961) | 2.55 in (2011) |
| May 27 | 91.0°F (1972) | 32.0°F (1992) | 1.47 in (2001) |
| May 28 | 97.0°F (2018) | 35.1°F (1992) | 1.02 in (2022) |
| May 29 | 96.1°F (2018) | 35.1°F (1965) | 2.73 in (1996) |
| May 30 | 91.9°F (1953) | 37.9°F (1961) | 1.83 in (2004) |
| May 31 | 91.9°F (1988) | 39.0°F (2021) | 0.95 in (2013) |