May weather in Castle Rock, CO
The average temperature in Castle Rock in May is 55.0°F (41.6°F–68.4°F). Average precipitation: 1.97 inches. Average snowfall is 1.1 inches.
May is a spring month in Castle Rock, and is warmer than the annual average of 49.5°F. Daily temperatures swing about 26.8°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 14h 10m. For travel, May is a comfortable month to visit.
Avg High
68.4°F
Avg Low
41.6°F
Precipitation
1.97 in
Snow
1.1 in
May records in Castle Rock
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 88.0°F (2020) | 12.0°F (1916) | 1.02 in (1980) |
| May 2 | 87.1°F (2020) | 19.0°F (2016) | 1.75 in (1904) |
| May 3 | 79.0°F (1966) | 7.0°F (1907) | 1.27 in (1898) |
| May 4 | 81.0°F (2020) | 18.0°F (1912) | 0.58 in (1981) |
| May 5 | 86.0°F (2012) | 23.0°F (1898) | 1.40 in (1969) |
| May 6 | 87.1°F (2000) | 16.0°F (1917) | 2.98 in (1973) |
| May 7 | 84.9°F (1963) | 16.0°F (1915) | 1.37 in (1969) |
| May 8 | 89.1°F (1895) | 19.9°F (1924) | 2.47 in (1927) |
| May 9 | 87.1°F (1895) | 21.0°F (1927) | 0.75 in (2015) |
| May 10 | 84.9°F (1962) | 19.0°F (1927) | 1.27 in (1912) |
| May 11 | 84.0°F (1894) | 21.0°F (2006) | 1.69 in (1949) |
| May 12 | 84.0°F (1962) | 21.0°F (1964) | 3.55 in (2023) |
| May 13 | 84.9°F (1895) | 24.1°F (2000) | 1.21 in (1982) |
| May 14 | 86.0°F (1978) | 21.0°F (1907) | 1.07 in (1923) |
| May 15 | 86.0°F (1996) | 14.0°F (1916) | 0.55 in (1980) |
| May 16 | 87.1°F (1927) | 23.0°F (1916) | 1.32 in (1969) |
| May 17 | 91.0°F (1927) | 19.0°F (1916) | 2.05 in (1995) |
| May 18 | 86.0°F (1911) | 21.9°F (1983) | 1.40 in (1995) |
| May 19 | 93.0°F (2020) | 19.9°F (1915) | 2.90 in (2017) |
| May 20 | 93.9°F (2020) | 25.0°F (1895) | 1.76 in (1988) |
| May 21 | 90.0°F (2020) | 19.0°F (2001) | 0.90 in (1910) |
| May 22 | 86.0°F (2005) | 19.9°F (1910) | 2.00 in (1894) |
| May 23 | 90.0°F (1989) | 21.0°F (2019) | 0.97 in (1965) |
| May 24 | 88.0°F (1911) | 24.1°F (1924) | 1.10 in (1898) |
| May 25 | 88.0°F (1964) | 32.0°F (1909) | 1.63 in (1904) |
| May 26 | 87.1°F (1911) | 30.0°F (1924) | 1.35 in (1996) |
| May 27 | 90.0°F (1895) | 24.1°F (1924) | 2.00 in (1897) |
| May 28 | 88.0°F (1989) | 24.1°F (1924) | 0.56 in (1914) |
| May 29 | 89.1°F (2006) | 23.0°F (1924) | 1.00 in (1975) |
| May 30 | 93.9°F (2003) | 21.9°F (1924) | 2.84 in (1894) |
| May 31 | 90.0°F (2000) | 24.1°F (1924) | 2.10 in (1895) |