Cascade Valley Weather in May
Average highs run from 69°F on May 1 to 77°F on May 31, and lows from 41°F to 49°F. Normal precipitation for the month is 0.72 in over about 6 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
- 74°F
- Average low
- 45°F
- Precipitation
- 0.72 in
- Record high
- 97°FMay 23, 2001
- Record low
- 25°FMay 5, 2010
- Chance of a freeze
- 35%
- Days of 90°F or more
- 1.7
- Daylight
- 14 h 28 min to 15 h 39 min
- Cloud cover
- 59%
- Humidity
- 50%
- Dew point
- 40°F
- Wind
- 7.8 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| May 1 | 69°F | 41°F | 89°F 1998 | 28°F 1954 | 18% |
| May 2 | 70°F | 41°F | 86°F 2014 | 28°F 2024 | 18% |
| May 3 | 70°F | 42°F | 88°F 2023 | 30°F 2001 | 18% |
| May 4 | 71°F | 42°F | 89°F 2026 | 31°F 2010 | 18% |
| May 5 | 71°F | 42°F | 86°F 1998 | 25°F 2010 | 19% |
| May 6 | 71°F | 42°F | 90°F 2013 | 30°F 2002 | 19% |
| May 7 | 72°F | 43°F | 90°F 2013 | 28°F 2003 | 19% |
| May 8 | 72°F | 43°F | 91°F 2013 | 27°F 2002 | 19% |
| May 9 | 72°F | 43°F | 93°F 2013 | 31°F 2010 | 19% |
| May 10 | 73°F | 44°F | 94°F 1949 | 31°F 2002 | 19% |
| May 11 | 73°F | 44°F | 95°F 1949 | 31°F 2012 | 19% |
| May 12 | 73°F | 44°F | 95°F 1949 | 34°F 2012 | 19% |
| May 13 | 73°F | 45°F | 91°F 1949 | 28°F 2006 | 20% |
| May 14 | 74°F | 45°F | 92°F 2012 | 31°F 1999 | 20% |
| May 15 | 74°F | 45°F | 94°F 2006 | 33°F 2017 | 20% |
| May 16 | 74°F | 46°F | 96°F 2006 | 34°F 2002 | 20% |
| May 17 | 74°F | 46°F | 96°F 2006 | 35°F 2011 | 20% |
| May 18 | 75°F | 46°F | 95°F 2006 | 35°F 1965 | 21% |
| May 19 | 75°F | 47°F | 93°F 2023 | 30°F 2003 | 21% |
| May 20 | 75°F | 47°F | 94°F 2023 | 39°F 2001 | 21% |
| May 21 | 75°F | 47°F | 92°F 1958 | 34°F 2010 | 21% |
| May 22 | 75°F | 47°F | 93°F 1958 | 33°F 2010 | 21% |
| May 23 | 76°F | 48°F | 97°F 2001 | 35°F 1964 | 21% |
| May 24 | 76°F | 48°F | 92°F 1958 | 33°F 2010 | 20% |
| May 25 | 76°F | 48°F | 94°F 1958 | 36°F 2013 | 20% |
| May 26 | 76°F | 48°F | 96°F 1958 | 40°F 1954 | 20% |
| May 27 | 76°F | 49°F | 92°F 1958 | 40°F 2011 | 20% |
| May 28 | 76°F | 49°F | 96°F 2026 | 35°F 2011 | 20% |
| May 29 | 76°F | 49°F | 95°F 2017 | 38°F 2021 | 20% |
| May 30 | 77°F | 49°F | 97°F 2017 | 39°F 2006 | 20% |
| May 31 | 77°F | 49°F | 93°F 1957 | 38°F 2024 | 20% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- May 1
- sunrise 5:41 AM, sunset 8:09 PM
- May 31
- sunrise 5:06 AM, sunset 8:45 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024110 (Moses Lake Grant CO AP), public domain. Records: NOAA GHCN-Daily, station USW00024110, 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.