May weather in Portage, WI
The average temperature in Portage in May is 58.0°F (47.8°F–68.2°F). Average precipitation: 4.58 inches.
May is a spring month in Portage, and is warmer than the annual average of 46.5°F. Daily temperatures swing about 20.4°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 14h 31m. For travel, May is a comfortable month to visit.
Avg High
68.2°F
Avg Low
47.8°F
Precipitation
4.58 in
Daylight
14h 31m
May records in Portage
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 95.0°F (1952) | 21.0°F (1978) | 1.44 in (1997) |
| May 2 | 89.1°F (1959) | 21.9°F (1978) | 1.63 in (2018) |
| May 3 | 88.0°F (1918) | 23.0°F (1971) | 1.36 in (1945) |
| May 4 | 93.0°F (1952) | 23.0°F (1976) | 2.52 in (2018) |
| May 5 | 91.0°F (1909) | 24.1°F (1967) | 1.65 in (1913) |
| May 6 | 93.9°F (1934) | 23.0°F (1970) | 1.70 in (1956) |
| May 7 | 89.1°F (1934) | 25.0°F (1967) | 2.60 in (1960) |
| May 8 | 88.0°F (1896) | 23.0°F (1976) | 1.65 in (1973) |
| May 9 | 95.0°F (1934) | 23.0°F (1966) | 1.48 in (1927) |
| May 10 | 89.1°F (1934) | 19.9°F (1966) | 2.15 in (2013) |
| May 11 | 90.0°F (2022) | 26.1°F (1907) | 1.59 in (1905) |
| May 12 | 87.1°F (1900) | 24.1°F (1967) | 1.18 in (2006) |
| May 13 | 93.9°F (2022) | 28.0°F (1971) | 3.10 in (1896) |
| May 14 | 91.9°F (2022) | 30.0°F (1935) | 1.82 in (1978) |
| May 15 | 88.0°F (1932) | 28.0°F (1983) | 1.42 in (1941) |
| May 16 | 88.0°F (1977) | 26.1°F (1967) | 1.32 in (1943) |
| May 17 | 88.0°F (1901) | 28.0°F (1983) | 1.37 in (1999) |
| May 18 | 88.0°F (1911) | 30.0°F (1976) | 3.71 in (2000) |
| May 19 | 93.0°F (1934) | 28.9°F (1981) | 1.35 in (1940) |
| May 20 | 93.0°F (1934) | 28.9°F (1981) | 1.52 in (1923) |
| May 21 | 91.0°F (1934) | 28.9°F (1971) | 1.51 in (2025) |
| May 22 | 91.9°F (1925) | 27.0°F (1967) | 1.80 in (2004) |
| May 23 | 91.9°F (1921) | 30.0°F (1917) | 1.98 in (2013) |
| May 24 | 91.9°F (1928) | 33.1°F (1976) | 1.10 in (1964) |
| May 25 | 93.0°F (2010) | 30.9°F (1979) | 1.80 in (1989) |
| May 26 | 91.0°F (1911) | 28.9°F (1983) | 1.78 in (2011) |
| May 27 | 91.0°F (1911) | 28.0°F (1971) | 2.32 in (2015) |
| May 28 | 93.9°F (2018) | 30.9°F (1971) | 3.07 in (1995) |
| May 29 | 95.0°F (1934) | 26.1°F (1965) | 1.87 in (1947) |
| May 30 | 93.0°F (1953) | 30.9°F (1966) | 1.64 in (1943) |
| May 31 | 102.0°F (1934) | 30.0°F (1966) | 2.14 in (2000) |