May weather in Portland, IN
The average temperature in Portland in May is 60.4°F (49.2°F–71.7°F). Average precipitation: 4.31 inches.
May is a spring month in Portland, and is warmer than the annual average of 50.3°F. Daily temperatures swing about 22.5°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 14h 15m. For travel, May is a comfortable month to visit.
Avg High
71.7°F
Avg Low
49.2°F
Precipitation
4.31 in
Daylight
14h 15m
May records in Portland
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 82.9°F (2001) | 27.0°F (1979) | 2.52 in (2009) |
| May 2 | 82.9°F (1992) | 30.9°F (1994) | 1.36 in (1985) |
| May 3 | 84.0°F (2024) | 30.0°F (1978) | 1.72 in (1948) |
| May 4 | 86.0°F (2001) | 28.0°F (2005) | 1.12 in (2022) |
| May 5 | 86.0°F (2001) | 30.0°F (1979) | 1.55 in (2017) |
| May 6 | 84.9°F (1982) | 35.1°F (1987) | 1.45 in (1967) |
| May 7 | 87.1°F (2004) | 28.9°F (1989) | 1.04 in (2023) |
| May 8 | 84.9°F (2015) | 26.1°F (2020) | 1.46 in (1962) |
| May 9 | 86.0°F (2014) | 27.0°F (2020) | 1.20 in (2021) |
| May 10 | 86.0°F (1993) | 30.0°F (1977) | 1.13 in (2024) |
| May 11 | 86.0°F (1979) | 28.9°F (2020) | 1.87 in (2003) |
| May 12 | 88.0°F (2011) | 28.9°F (2020) | 0.87 in (1959) |
| May 13 | 86.0°F (1982) | 28.9°F (1996) | 1.37 in (1990) |
| May 14 | 86.0°F (1982) | 30.9°F (1996) | 1.29 in (1957) |
| May 15 | 88.0°F (1982) | 35.1°F (1980) | 0.98 in (2011) |
| May 16 | 89.1°F (1988) | 35.1°F (1979) | 1.27 in (1990) |
| May 17 | 89.1°F (1991) | 37.9°F (2014) | 0.92 in (1960) |
| May 18 | 88.0°F (1987) | 35.1°F (2023) | 1.83 in (2020) |
| May 19 | 89.1°F (1977) | 35.1°F (2023) | 1.55 in (2000) |
| May 20 | 90.0°F (1977) | 34.0°F (1993) | 1.15 in (1949) |
| May 21 | 90.0°F (1977) | 37.0°F (2015) | 0.95 in (1985) |
| May 22 | 89.1°F (1977) | 35.1°F (1997) | 1.23 in (2010) |
| May 23 | 88.0°F (2024) | 8.1°F (2005) | 1.49 in (1953) |
| May 24 | 88.0°F (2024) | 39.0°F (2025) | 1.68 in (1979) |
| May 25 | 90.0°F (1977) | 39.0°F (1976) | 2.40 in (2017) |
| May 26 | 90.0°F (2012) | 36.0°F (1983) | 2.95 in (1989) |
| May 27 | 91.0°F (2012) | 33.1°F (1983) | 3.24 in (1946) |
| May 28 | 91.9°F (2012) | 35.1°F (1992) | 1.88 in (1956) |
| May 29 | 91.9°F (2012) | 37.9°F (2021) | 1.10 in (1967) |
| May 30 | 90.0°F (1987) | 37.9°F (2021) | 1.10 in (1972) |
| May 31 | 89.1°F (1991) | 39.9°F (1984) | 1.90 in (2015) |