May weather in South Beloit, IL
The average temperature in South Beloit in May is 56.1°F (45.7°F–66.5°F). Average precipitation: 4.34 inches.
May is a spring month in South Beloit, and is warmer than the annual average of 45.4°F. Daily temperatures swing about 20.8°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 14h 25m. For travel, May is a comfortable month to visit.
Avg High
66.5°F
Avg Low
45.7°F
Precipitation
4.34 in
Daylight
14h 25m
May records in South Beloit
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 88.0°F (1952) | 27.0°F (1978) | 1.70 in (2003) |
| May 2 | 89.1°F (1959) | 28.9°F (1911) | 1.48 in (1933) |
| May 3 | 89.1°F (1918) | 27.0°F (1966) | 1.49 in (1935) |
| May 4 | 93.0°F (1959) | 27.0°F (1907) | 1.85 in (1912) |
| May 5 | 91.0°F (1949) | 30.0°F (1992) | 1.12 in (1932) |
| May 6 | 90.0°F (1934) | 30.0°F (1989) | 1.60 in (1960) |
| May 7 | 90.0°F (1934) | 26.1°F (1974) | 1.05 in (1904) |
| May 8 | 89.1°F (1936) | 30.0°F (1976) | 1.35 in (2024) |
| May 9 | 95.0°F (1934) | 26.1°F (1966) | 1.06 in (2003) |
| May 10 | 90.0°F (1922) | 27.0°F (1966) | 1.80 in (1957) |
| May 11 | 91.0°F (1934) | 25.0°F (1980) | 1.86 in (1905) |
| May 12 | 91.9°F (2022) | 32.0°F (1981) | 1.00 in (1970) |
| May 13 | 93.0°F (2022) | 32.0°F (1923) | 2.33 in (2014) |
| May 14 | 93.0°F (2022) | 28.9°F (1920) | 1.85 in (1945) |
| May 15 | 91.0°F (1946) | 30.0°F (1926) | 1.80 in (2003) |
| May 16 | 93.9°F (2025) | 30.0°F (1921) | 1.20 in (1974) |
| May 17 | 91.0°F (1962) | 35.1°F (1997) | 1.70 in (1969) |
| May 18 | 91.9°F (1934) | 32.0°F (1925) | 1.52 in (1902) |
| May 19 | 95.0°F (1975) | 30.9°F (1929) | 3.75 in (1959) |
| May 20 | 93.9°F (1975) | 30.0°F (1924) | 1.38 in (1933) |
| May 21 | 90.0°F (1921) | 30.0°F (2002) | 1.48 in (1996) |
| May 22 | 93.0°F (1925) | 30.0°F (2002) | 1.50 in (2004) |
| May 23 | 90.0°F (1921) | 32.0°F (1917) | 1.21 in (1901) |
| May 24 | 93.0°F (1975) | 32.0°F (1925) | 1.13 in (2020) |
| May 25 | 93.0°F (2010) | 28.9°F (1925) | 3.15 in (1922) |
| May 26 | 93.0°F (1967) | 32.0°F (1925) | 1.80 in (1913) |
| May 27 | 93.0°F (1978) | 32.0°F (1895) | 2.05 in (1899) |
| May 28 | 95.0°F (2012) | 34.0°F (1907) | 2.40 in (1945) |
| May 29 | 95.0°F (1934) | 34.0°F (1947) | 2.63 in (1996) |
| May 30 | 91.9°F (1953) | 37.0°F (1924) | 1.04 in (2019) |
| May 31 | 102.9°F (1934) | 37.9°F (1894) | 2.20 in (1958) |