May weather in Rock Island, WA
The average temperature in Rock Island in May is 60.1°F (48.7°F–71.6°F). Average precipitation: 0.77 inches.
May is a spring month in Rock Island, and is warmer than the annual average of 51.2°F. Daily temperatures swing about 22.9°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 14h 54m. For travel, May is a comfortable month to visit.
Avg High
71.6°F
Avg Low
48.7°F
Precipitation
0.77 in
Daylight
14h 54m
May records in Rock Island
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 87.1°F (1998) | 34.0°F (1963) | 0.21 in (1984) |
| May 2 | 84.9°F (2014) | 35.1°F (1997) | 0.58 in (2022) |
| May 3 | 87.1°F (1966) | 34.0°F (1996) | 0.29 in (1960) |
| May 4 | 89.1°F (1966) | 32.0°F (1962) | 0.42 in (2024) |
| May 5 | 91.0°F (1966) | 32.0°F (1968) | 0.15 in (2017) |
| May 6 | 93.0°F (1992) | 33.1°F (2002) | 0.28 in (1960) |
| May 7 | 91.9°F (1987) | 34.0°F (1996) | 0.36 in (1991) |
| May 8 | 93.0°F (1987) | 35.1°F (1996) | 0.44 in (1972) |
| May 9 | 91.9°F (1987) | 34.0°F (1985) | 0.64 in (1995) |
| May 10 | 91.9°F (2013) | 36.0°F (1970) | 0.50 in (1975) |
| May 11 | 91.9°F (1993) | 32.0°F (1985) | 0.17 in (2004) |
| May 12 | 98.1°F (1993) | 32.0°F (1985) | 0.48 in (1998) |
| May 13 | 91.0°F (1993) | 35.1°F (1970) | 0.38 in (2015) |
| May 14 | 93.0°F (1997) | 36.0°F (1971) | 0.61 in (2011) |
| May 15 | 91.0°F (1973) | 37.9°F (1974) | 0.84 in (2011) |
| May 16 | 95.0°F (2006) | 35.1°F (1969) | 0.21 in (2019) |
| May 17 | 96.1°F (2006) | 37.0°F (1988) | 0.59 in (1991) |
| May 18 | 97.0°F (2006) | 39.0°F (1965) | 0.41 in (1981) |
| May 19 | 91.0°F (2023) | 34.0°F (1975) | 0.91 in (1981) |
| May 20 | 91.9°F (2023) | 35.1°F (1971) | 0.86 in (2007) |
| May 21 | 89.1°F (1963) | 36.0°F (2010) | 0.65 in (2007) |
| May 22 | 90.0°F (1979) | 37.0°F (1960) | 0.55 in (2013) |
| May 23 | 93.0°F (2001) | 37.9°F (1964) | 0.47 in (1962) |
| May 24 | 93.9°F (1999) | 35.1°F (1975) | 0.50 in (1962) |
| May 25 | 93.0°F (1983) | 39.0°F (1984) | 0.49 in (1981) |
| May 26 | 89.1°F (2001) | 39.9°F (1973) | 0.47 in (2010) |
| May 27 | 89.1°F (2005) | -0.9°F (2011) | 0.33 in (1982) |
| May 28 | 93.9°F (1983) | 41.0°F (1976) | 0.42 in (1967) |
| May 29 | 98.1°F (1983) | 39.9°F (1976) | 0.16 in (1970) |
| May 30 | 102.9°F (1986) | 42.1°F (1984) | 0.26 in (1998) |
| May 31 | 102.9°F (1986) | 41.0°F (1984) | 0.77 in (1993) |