Tumwater Weather in May
Average highs run from 63°F on May 1 to 68°F on May 31, and lows from 40°F to 46°F. Normal precipitation for the month is 2.26 in over about 11 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
- 66°F
- Average low
- 43°F
- Precipitation
- 2.26 in
- Record high
- 96°FMay 28, 1983
- Record low
- 25°FMay 1, 1954
- Chance of a freeze
- 44%
- Daylight
- 14 h 27 min to 15 h 37 min
- Cloud cover
- 69%
- Humidity
- 83%
- Dew point
- 48°F
- Wind
- 3.8 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 | 63°F | 40°F | 88°F 2014 | 25°F 1954 | 45% | 0% |
| May 2 | 63°F | 40°F | 89°F 1945 | 26°F 1964 | 45% | 0% |
| May 3 | 63°F | 40°F | 85°F 2026 | 30°F 1980 | 44% | 0% |
| May 4 | 64°F | 41°F | 89°F 1992 | 29°F 1949 | 43% | 0% |
| May 5 | 64°F | 41°F | 88°F 1953 | 27°F 1978 | 43% | 0% |
| May 6 | 64°F | 41°F | 86°F 2013 | 27°F 1965 | 42% | 0% |
| May 7 | 64°F | 41°F | 84°F 1987 | 26°F 2002 | 41% | 0% |
| May 8 | 65°F | 41°F | 87°F 1987 | 29°F 2002 | 41% | 0% |
| May 9 | 65°F | 42°F | 85°F 1987 | 26°F 1996 | 40% | 0% |
| May 10 | 65°F | 42°F | 88°F 2024 | 30°F 1944 | 40% | 0% |
| May 11 | 65°F | 42°F | 88°F 1971 | 29°F 1970 | 39% | 0% |
| May 12 | 66°F | 42°F | 85°F 2023 | 28°F 1985 | 39% | 0% |
| May 13 | 66°F | 43°F | 89°F 2023 | 29°F 1958 | 39% | 0% |
| May 14 | 66°F | 43°F | 90°F 2023 | 28°F 1964 | 38% | 0% |
| May 15 | 66°F | 43°F | 92°F 2023 | 27°F 1964 | 38% | 0% |
| May 16 | 66°F | 43°F | 86°F 1985 | 31°F 2002 | 38% | 0% |
| May 17 | 67°F | 43°F | 91°F 2008 | 30°F 2011 | 37% | 0% |
| May 18 | 67°F | 44°F | 90°F 1956 | 28°F 2003 | 37% | 0% |
| May 19 | 67°F | 44°F | 86°F 1961 | 31°F 1962 | 37% | 0% |
| May 20 | 67°F | 44°F | 90°F 1963 | 29°F 1975 | 36% | 0% |
| May 21 | 67°F | 44°F | 89°F 1963 | 32°F 1973 | 36% | 0% |
| May 22 | 67°F | 44°F | 91°F 2001 | 31°F 1960 | 36% | 0% |
| May 23 | 68°F | 45°F | 89°F 1969 | 32°F 1950 | 35% | 0% |
| May 24 | 68°F | 45°F | 89°F 1992 | 33°F 1950 | 35% | 0% |
| May 25 | 68°F | 45°F | 88°F 1947 | 30°F 1975 | 35% | 0% |
| May 26 | 68°F | 45°F | 91°F 1947 | 32°F 1964 | 34% | 0% |
| May 27 | 68°F | 45°F | 92°F 2005 | 34°F 1963 | 34% | 0% |
| May 28 | 68°F | 45°F | 96°F 1983 | 28°F 1966 | 34% | 0% |
| May 29 | 68°F | 46°F | 88°F 1945 | 33°F 1966 | 34% | 0% |
| May 30 | 68°F | 46°F | 92°F 1956 | 33°F 1966 | 33% | 0% |
| May 31 | 68°F | 46°F | 88°F 1986 | 30°F 1953 | 33% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- May 1
- sunrise 5:56 AM, sunset 8:23 PM
- May 31
- sunrise 5:21 AM, sunset 8:58 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024227 (Olympia AP), public domain. Records: NOAA GHCN-Daily, station USW00024227, 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.