May weather in Sun Prairie, WI
The average temperature in Sun Prairie in May is 58.1°F (47.1°F–69.0°F). Average precipitation: 4.10 inches.
May is a spring month in Sun Prairie, and is warmer than the annual average of 47°F. Daily temperatures swing about 21.9°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 14h 29m. For travel, May is a comfortable month to visit.
Avg High
69.0°F
Avg Low
47.1°F
Precipitation
4.10 in
Snow
0.1 in
May records in Sun Prairie
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 93.0°F (1952) | 19.0°F (1978) | 1.80 in (2025) |
| May 2 | 89.1°F (1959) | 23.0°F (1978) | 1.37 in (2018) |
| May 3 | 88.0°F (1949) | 25.0°F (1971) | 1.38 in (2018) |
| May 4 | 90.0°F (1952) | 26.1°F (1966) | 0.95 in (1946) |
| May 5 | 90.0°F (1949) | 28.9°F (1958) | 1.41 in (1982) |
| May 6 | 86.0°F (2016) | 25.0°F (1970) | 2.55 in (1960) |
| May 7 | 84.0°F (1964) | 24.1°F (1989) | 1.09 in (1973) |
| May 8 | 84.9°F (1953) | 26.1°F (1966) | 1.11 in (1995) |
| May 9 | 86.0°F (1979) | 19.9°F (1966) | 1.57 in (1990) |
| May 10 | 90.0°F (2022) | 21.9°F (1966) | 1.18 in (1967) |
| May 11 | 91.0°F (2022) | 28.9°F (1990) | 0.96 in (2011) |
| May 12 | 93.9°F (2022) | 24.1°F (1981) | 1.84 in (1970) |
| May 13 | 91.9°F (2022) | 28.9°F (1966) | 2.39 in (1978) |
| May 14 | 89.1°F (1991) | 32.0°F (1964) | 1.47 in (1945) |
| May 15 | 87.1°F (2025) | 30.0°F (1983) | 1.17 in (1977) |
| May 16 | 87.1°F (1951) | 27.0°F (1997) | 1.64 in (1999) |
| May 17 | 86.0°F (1962) | 32.0°F (2002) | 2.58 in (2000) |
| May 18 | 89.1°F (1972) | 28.0°F (2002) | 2.09 in (2000) |
| May 19 | 93.0°F (1975) | 30.9°F (2002) | 1.27 in (2005) |
| May 20 | 88.0°F (1941) | 32.0°F (1954) | 1.04 in (2025) |
| May 21 | 89.1°F (1972) | 30.0°F (1997) | 3.66 in (2004) |
| May 22 | 91.9°F (1975) | 27.0°F (1967) | 1.04 in (2004) |
| May 23 | 91.0°F (1975) | 28.0°F (1958) | 3.64 in (1966) |
| May 24 | 91.9°F (1950) | 32.0°F (1992) | 2.25 in (2024) |
| May 25 | 89.1°F (1977) | 30.0°F (1988) | 1.45 in (2022) |
| May 26 | 91.0°F (1978) | 30.0°F (1983) | 1.14 in (1985) |
| May 27 | 95.0°F (2018) | 30.9°F (1971) | 1.46 in (2014) |
| May 28 | 93.0°F (2018) | 34.0°F (1949) | 1.43 in (2020) |
| May 29 | 91.0°F (1991) | 30.0°F (1965) | 0.79 in (2013) |
| May 30 | 91.9°F (1953) | 30.0°F (1965) | 2.15 in (1958) |
| May 31 | 91.0°F (2023) | 32.0°F (1966) | 2.33 in (2000) |