Castle Rock Weather in May
Average highs run from 66°F on May 1 to 71°F on May 31, and lows from 42°F to 48°F. Normal precipitation for the month is 3.11 in over about 14 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 69°F
- Average low
- 45°F
- Precipitation
- 3.11 in
- Record high
- 99°FMay 23, 2001
- Record low
- 27°FMay 8, 1930
- Chance of a freeze
- 12%
- Daylight
- 14 h 23 min to 15 h 31 min
- Cloud cover
- 71%
- Humidity
- 85%
- Dew point
- 47°F
- Wind
- 3.6 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| May 1 | 66°F | 42°F | 88°F 2004 | 30°F 1939 | 54% | 0% |
| May 2 | 66°F | 43°F | 87°F 2016 | 30°F 1935 | 53% | 0% |
| May 3 | 66°F | 43°F | 90°F 2026 | 32°F 1930 | 52% | 0% |
| May 4 | 67°F | 43°F | 90°F 2026 | 28°F 1930 | 52% | 0% |
| May 5 | 67°F | 43°F | 88°F 1953 | 28°F 1937 | 51% | 0% |
| May 6 | 67°F | 43°F | 83°F 1992 | 32°F 1930 | 50% | 0% |
| May 7 | 67°F | 44°F | 85°F 1957 | 31°F 1930 | 49% | 0% |
| May 8 | 68°F | 44°F | 89°F 1987 | 27°F 1930 | 49% | 0% |
| May 9 | 68°F | 44°F | 93°F 1987 | 32°F 1930 | 48% | 0% |
| May 10 | 68°F | 44°F | 90°F 2024 | 31°F 1944 | 48% | 0% |
| May 11 | 68°F | 44°F | 90°F 2024 | 32°F 1932 | 47% | 0% |
| May 12 | 68°F | 45°F | 92°F 1971 | 31°F 1985 | 47% | 0% |
| May 13 | 69°F | 45°F | 93°F 1939 | 31°F 1938 | 46% | 0% |
| May 14 | 69°F | 45°F | 93°F 2023 | 32°F 1929 | 46% | 0% |
| May 15 | 69°F | 45°F | 93°F 2023 | 31°F 1932 | 46% | 0% |
| May 16 | 69°F | 45°F | 91°F 2008 | 34°F 1932 | 45% | 0% |
| May 17 | 69°F | 46°F | 94°F 2008 | 32°F 1966 | 45% | 0% |
| May 18 | 69°F | 46°F | 97°F 1956 | 32°F 1935 | 45% | 0% |
| May 19 | 70°F | 46°F | 90°F 1963 | 32°F 1939 | 45% | 0% |
| May 20 | 70°F | 46°F | 91°F 1961 | 33°F 1937 | 45% | 0% |
| May 21 | 70°F | 46°F | 92°F 1963 | 32°F 1999 | 44% | 0% |
| May 22 | 70°F | 47°F | 91°F 1988 | 34°F 1935 | 44% | 0% |
| May 23 | 70°F | 47°F | 99°F 2001 | 31°F 1935 | 44% | 0% |
| May 24 | 70°F | 47°F | 91°F 2003 | 28°F 1935 | 44% | 0% |
| May 25 | 70°F | 47°F | 92°F 1992 | 32°F 1930 | 43% | 0% |
| May 26 | 70°F | 47°F | 88°F 1986 | 34°F 1973 | 43% | 0% |
| May 27 | 71°F | 47°F | 98°F 2005 | 32°F 1966 | 43% | 0% |
| May 28 | 71°F | 48°F | 95°F 2005 | 33°F 1943 | 43% | 0% |
| May 29 | 71°F | 48°F | 96°F 1983 | 35°F 1951 | 42% | 0% |
| May 30 | 71°F | 48°F | 90°F 2007 | 33°F 1950 | 42% | 0% |
| May 31 | 71°F | 48°F | 89°F 1956 | 31°F 1938 | 42% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- May 1
- sunrise 5:58 AM, sunset 8:21 PM
- May 31
- sunrise 5:24 AM, sunset 8:55 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00454769 (Longview), public domain. Records: NOAA GHCN-Daily, station USC00454769, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.