May weather in Decorah, IA
The average temperature in Decorah in May is 60.5°F (48.4°F–72.5°F). Average precipitation: 4.94 inches.
May is a spring month in Decorah, and is warmer than the annual average of 48.5°F. Daily temperatures swing about 24.1°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 14h 30m. For travel, May is a comfortable month to visit.
Avg High
72.5°F
Avg Low
48.4°F
Precipitation
4.94 in
Daylight
14h 30m
May records in Decorah
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 91.0°F (2021) | 26.1°F (1909) | 1.90 in (1954) |
| May 2 | 91.9°F (1901) | 24.1°F (1911) | 1.76 in (2018) |
| May 3 | 91.9°F (1949) | 19.9°F (1908) | 1.34 in (1902) |
| May 4 | 90.0°F (1949) | 21.9°F (1907) | 3.75 in (2018) |
| May 5 | 95.0°F (1909) | 27.0°F (1900) | 2.37 in (1932) |
| May 6 | 95.0°F (1934) | 25.0°F (1989) | 1.71 in (1930) |
| May 7 | 88.0°F (1896) | 23.0°F (1925) | 1.74 in (1900) |
| May 8 | 93.0°F (1934) | 28.0°F (1925) | 1.15 in (2015) |
| May 9 | 89.1°F (1896) | 24.1°F (2020) | 1.93 in (2002) |
| May 10 | 90.0°F (1895) | 21.9°F (1966) | 1.72 in (1918) |
| May 11 | 91.9°F (2022) | 24.1°F (1925) | 2.17 in (2005) |
| May 12 | 93.9°F (2022) | 27.0°F (2020) | 1.60 in (2023) |
| May 13 | 93.9°F (2022) | 28.0°F (1996) | 1.97 in (1991) |
| May 14 | 93.9°F (1940) | 28.9°F (1912) | 1.91 in (2023) |
| May 15 | 93.9°F (2013) | 27.0°F (1895) | 1.35 in (1909) |
| May 16 | 93.0°F (1936) | 28.0°F (1997) | 2.97 in (1968) |
| May 17 | 93.0°F (1934) | 28.0°F (1925) | 1.41 in (2013) |
| May 18 | 97.0°F (1934) | 30.0°F (1925) | 1.55 in (2000) |
| May 19 | 96.1°F (1934) | 27.0°F (1929) | 3.25 in (2019) |
| May 20 | 95.0°F (1934) | 30.0°F (1954) | 1.59 in (1959) |
| May 21 | 93.0°F (1948) | 30.0°F (1997) | 3.35 in (1902) |
| May 22 | 95.0°F (1925) | 30.9°F (1967) | 2.01 in (2004) |
| May 23 | 88.0°F (1955) | 25.0°F (1931) | 1.43 in (1920) |
| May 24 | 91.9°F (2010) | 32.0°F (1917) | 3.28 in (1914) |
| May 25 | 97.0°F (1911) | 28.9°F (1925) | 1.70 in (2011) |
| May 26 | 95.0°F (1911) | 28.9°F (1925) | 2.65 in (1965) |
| May 27 | 93.9°F (2018) | 30.9°F (1971) | 1.05 in (1955) |
| May 28 | 96.1°F (1913) | 30.0°F (1928) | 2.02 in (1927) |
| May 29 | 96.1°F (1934) | 30.0°F (1965) | 1.86 in (1931) |
| May 30 | 97.0°F (1934) | 33.1°F (1930) | 2.59 in (2013) |
| May 31 | 102.0°F (1934) | 28.0°F (1897) | 1.31 in (1959) |