May weather in Irwin, ID
The average temperature in Irwin in May is 50.3°F (34.6°F–65.9°F). Average precipitation: 2.53 inches.
May is a spring month in Irwin, and is warmer than the annual average of 42.6°F. Daily temperatures swing about 31.3°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 14h 30m. For travel, May is cool.
Avg High
65.9°F
Avg Low
34.6°F
Precipitation
2.53 in
Daylight
14h 30m
May records in Irwin
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 80.1°F (1985) | 12.0°F (1990) | 0.89 in (2018) |
| May 2 | 82.0°F (1985) | 17.1°F (2013) | 0.34 in (1995) |
| May 3 | 81.0°F (2023) | 18.0°F (1974) | 0.58 in (1983) |
| May 4 | 81.0°F (1966) | 19.9°F (1974) | 0.70 in (1994) |
| May 5 | 82.9°F (1992) | 14.0°F (1982) | 0.37 in (2009) |
| May 6 | 86.0°F (1992) | 12.9°F (1979) | 1.31 in (1993) |
| May 7 | 82.0°F (1992) | 19.0°F (1968) | 1.82 in (1988) |
| May 8 | 79.0°F (1987) | 19.0°F (1968) | 0.67 in (1979) |
| May 9 | 80.1°F (1987) | 19.0°F (2021) | 1.10 in (1963) |
| May 10 | 80.1°F (2007) | 15.1°F (2008) | 1.05 in (1985) |
| May 11 | 87.1°F (2025) | 19.0°F (1973) | 0.62 in (1981) |
| May 12 | 82.0°F (2007) | 21.0°F (1973) | 0.98 in (1963) |
| May 13 | 82.9°F (2001) | 19.9°F (1983) | 0.68 in (1968) |
| May 14 | 84.9°F (2013) | 19.9°F (1974) | 0.43 in (1968) |
| May 15 | 84.9°F (2012) | 23.0°F (1986) | 0.60 in (1994) |
| May 16 | 87.1°F (2006) | 12.9°F (1974) | 0.76 in (1996) |
| May 17 | 84.0°F (1992) | 25.0°F (1974) | 0.66 in (1977) |
| May 18 | 87.1°F (1992) | 19.9°F (1974) | 0.63 in (2013) |
| May 19 | 88.0°F (1992) | 19.0°F (2003) | 0.98 in (2025) |
| May 20 | 93.0°F (2005) | 23.0°F (2022) | 0.72 in (2016) |
| May 21 | 87.1°F (2023) | 19.9°F (2001) | 1.54 in (1981) |
| May 22 | 87.1°F (2023) | 23.0°F (1973) | 0.76 in (1971) |
| May 23 | 84.9°F (1967) | 18.0°F (1966) | 0.88 in (2021) |
| May 24 | 84.9°F (2003) | 26.1°F (1966) | 1.35 in (2011) |
| May 25 | 84.0°F (1969) | 19.9°F (1975) | 0.56 in (2016) |
| May 26 | 82.9°F (1966) | 21.9°F (1975) | 0.92 in (1981) |
| May 27 | 84.9°F (1966) | 24.1°F (1973) | 0.90 in (1987) |
| May 28 | 84.0°F (1983) | 25.0°F (1973) | 0.96 in (1987) |
| May 29 | 84.9°F (1966) | 24.1°F (1975) | 0.43 in (1997) |
| May 30 | 91.0°F (2003) | 17.1°F (1979) | 0.57 in (2019) |
| May 31 | 88.0°F (2020) | 19.0°F (1979) | 1.05 in (2009) |