May weather in Castle Rock, WA
The average temperature in Castle Rock in May is 57.1°F (45.3°F–68.8°F). Average precipitation: 3.11 inches.
May is a spring month in Castle Rock, and is warmer than the annual average of 53.2°F. Daily temperatures swing about 23.5°F between overnight low and afternoon high. Expect about 14 days with precipitation. Daylight averages about 14h 47m. For travel, May is a comfortable month to visit.
Avg High
68.8°F
Avg Low
45.3°F
Precipitation
3.11 in
Daylight
14h 47m
May records in Castle Rock
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 88.0°F (2004) | 30.0°F (1939) | 0.88 in (1932) |
| May 2 | 87.1°F (2016) | 30.0°F (1935) | 0.84 in (1976) |
| May 3 | 89.1°F (1946) | 32.0°F (1930) | 0.87 in (1975) |
| May 4 | 87.1°F (1953) | 28.0°F (1930) | 1.48 in (1926) |
| May 5 | 88.0°F (1953) | 28.0°F (1937) | 0.89 in (1948) |
| May 6 | 82.9°F (1992) | 32.0°F (1930) | 1.02 in (1948) |
| May 7 | 84.9°F (1957) | 30.9°F (1930) | 0.76 in (1966) |
| May 8 | 89.1°F (1987) | 27.0°F (1930) | 0.77 in (1991) |
| May 9 | 93.0°F (1987) | 32.0°F (1930) | 0.73 in (1970) |
| May 10 | 90.0°F (2024) | 30.9°F (1944) | 1.31 in (2005) |
| May 11 | 90.0°F (2024) | 32.0°F (1932) | 0.64 in (1945) |
| May 12 | 91.9°F (1971) | 30.9°F (1985) | 0.70 in (1987) |
| May 13 | 93.0°F (1939) | 30.9°F (1938) | 0.63 in (1998) |
| May 14 | 93.0°F (2023) | 32.0°F (1929) | 0.98 in (1936) |
| May 15 | 93.0°F (2023) | 30.9°F (1932) | 0.97 in (1959) |
| May 16 | 91.0°F (2008) | 34.0°F (1932) | 0.91 in (2017) |
| May 17 | 93.9°F (2008) | 32.0°F (1966) | 0.52 in (1934) |
| May 18 | 97.0°F (1956) | 32.0°F (1935) | 0.51 in (1933) |
| May 19 | 90.0°F (1963) | 32.0°F (1939) | 0.55 in (1969) |
| May 20 | 91.0°F (1961) | 33.1°F (1937) | 1.28 in (1968) |
| May 21 | 91.9°F (1963) | 32.0°F (1999) | 0.98 in (1968) |
| May 22 | 91.0°F (1988) | 34.0°F (1935) | 1.02 in (2006) |
| May 23 | 99.0°F (2001) | 30.9°F (1935) | 0.83 in (1957) |
| May 24 | 91.0°F (2003) | 28.0°F (1935) | 0.89 in (1974) |
| May 25 | 91.9°F (1992) | 32.0°F (1930) | 0.71 in (1998) |
| May 26 | 88.0°F (1986) | 34.0°F (1973) | 0.68 in (1954) |
| May 27 | 98.1°F (2005) | 32.0°F (1966) | 0.67 in (2013) |
| May 28 | 95.0°F (2005) | 33.1°F (1943) | 0.93 in (2004) |
| May 29 | 96.1°F (1983) | 35.1°F (1951) | 1.05 in (2010) |
| May 30 | 90.0°F (2007) | 33.1°F (1950) | 0.78 in (1943) |
| May 31 | 89.1°F (1956) | 30.9°F (1938) | 1.20 in (1997) |