May weather in Marathon, IA
The average temperature in Marathon in May is 59.1°F (48.3°F–69.9°F). Average precipitation: 4.19 inches. Average snowfall is 0.3 inches.
May is a spring month in Marathon, and is warmer than the annual average of 46.4°F. Daily temperatures swing about 21.6°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 14h 27m. For travel, May is a comfortable month to visit.
Avg High
69.9°F
Avg Low
48.3°F
Precipitation
4.19 in
Snow
0.3 in
May records in Marathon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 91.9°F (1987) | 24.1°F (1950) | 1.39 in (2013) |
| May 2 | 91.9°F (2021) | 24.1°F (1967) | 1.73 in (2024) |
| May 3 | 93.0°F (1949) | 23.0°F (1967) | 1.90 in (1959) |
| May 4 | 91.9°F (1949) | 25.0°F (1967) | 1.48 in (1981) |
| May 5 | 88.0°F (1962) | 25.0°F (1944) | 1.50 in (1959) |
| May 6 | 86.0°F (2016) | 26.1°F (1954) | 2.30 in (2007) |
| May 7 | 91.0°F (2014) | 28.0°F (1989) | 1.67 in (2024) |
| May 8 | 88.0°F (1963) | 28.9°F (1947) | 1.25 in (1950) |
| May 9 | 91.0°F (1987) | 24.1°F (1966) | 1.72 in (2024) |
| May 10 | 96.1°F (2011) | 28.0°F (1968) | 2.11 in (1967) |
| May 11 | 87.1°F (2000) | 24.1°F (1946) | 1.40 in (2002) |
| May 12 | 91.0°F (2022) | 26.1°F (1946) | 1.54 in (2005) |
| May 13 | 96.1°F (2022) | 25.0°F (1997) | 2.17 in (2023) |
| May 14 | 102.9°F (2013) | 30.9°F (2021) | 1.53 in (2019) |
| May 15 | 95.0°F (2001) | 28.9°F (1997) | 1.17 in (1982) |
| May 16 | 91.0°F (1987) | 28.0°F (2014) | 2.17 in (1943) |
| May 17 | 93.0°F (1987) | 32.0°F (1968) | 2.55 in (1991) |
| May 18 | 93.0°F (1970) | 34.0°F (1968) | 1.83 in (1944) |
| May 19 | 91.9°F (1948) | 30.0°F (1954) | 1.78 in (1962) |
| May 20 | 93.9°F (1948) | 30.0°F (1954) | 2.29 in (2001) |
| May 21 | 91.9°F (1970) | 33.1°F (1968) | 2.42 in (2024) |
| May 22 | 91.9°F (1964) | 28.9°F (1963) | 1.13 in (1965) |
| May 23 | 91.9°F (1950) | 28.0°F (1963) | 2.04 in (1946) |
| May 24 | 93.9°F (2010) | 35.1°F (1949) | 1.55 in (2012) |
| May 25 | 102.0°F (1967) | 37.9°F (1992) | 1.70 in (1960) |
| May 26 | 93.9°F (2018) | 36.0°F (1971) | 1.24 in (1945) |
| May 27 | 99.0°F (2018) | 35.1°F (1971) | 2.01 in (2013) |
| May 28 | 98.1°F (2018) | 30.9°F (1947) | 1.30 in (1959) |
| May 29 | 93.0°F (1943) | 26.1°F (1947) | 2.45 in (2008) |
| May 30 | 93.0°F (1943) | 33.1°F (2021) | 2.00 in (1993) |
| May 31 | 90.0°F (2023) | 36.0°F (1972) | 1.78 in (1991) |