Grant County Weather in May
Average highs run from 62°F on May 1 to 70°F on May 31, and lows from 33°F to 40°F. Normal precipitation for the month is 1.83 in over about 12 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
- 37°F
- Precipitation
- 1.83 in
- Record high
- 98°FMay 29, 1983
- Record low
- 13°FMay 2, 1954
- Chance of a freeze
- 98%
- Days of 90°F or more
- 0.6
- Daylight
- 14 h 15 min to 15 h 18 min
- Cloud cover
- 64%
- Humidity
- 66%
- Dew point
- 35°F
- Wind
- 4.9 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 | 62°F | 33°F | 85°F 2023 | 17°F 1954 | 38% | |
| May 2 | 62°F | 34°F | 85°F 1906 | 13°F 1954 | 38% | |
| May 3 | 63°F | 34°F | 87°F 1966 | 21°F 1964 | 38% | |
| May 4 | 63°F | 34°F | 91°F 1966 | 24°F 1962 | 38% | |
| May 5 | 63°F | 34°F | 94°F 1966 | 24°F 1965 | 38% | |
| May 6 | 64°F | 35°F | 91°F 1990 | 19°F 1964 | 38% | |
| May 7 | 64°F | 35°F | 92°F 1987 | 26°F 1965 | 38% | |
| May 8 | 64°F | 35°F | 91°F 1987 | 27°F 2002 | 38% | |
| May 9 | 65°F | 36°F | 93°F 1992 | 26°F 1965 | 38% | |
| May 10 | 65°F | 36°F | 88°F 1954 | 16°F 2024 | 38% | |
| May 11 | 65°F | 36°F | 87°F 1960 | 25°F 1970 | 38% | |
| May 12 | 66°F | 36°F | 87°F 1960 | 25°F 1985 | 38% | 0% |
| May 13 | 66°F | 37°F | 91°F 1988 | 23°F 2024 | 39% | 0% |
| May 14 | 66°F | 37°F | 91°F 1976 | 26°F 1962 | 39% | 0% |
| May 15 | 66°F | 37°F | 92°F 1973 | 25°F 1974 | 39% | 0% |
| May 16 | 67°F | 37°F | 92°F 1905 | 27°F 1977 | 39% | 0% |
| May 17 | 67°F | 38°F | 95°F 2006 | 25°F 1974 | 39% | 0% |
| May 18 | 67°F | 38°F | 96°F 2008 | 29°F 1965 | 39% | 0% |
| May 19 | 67°F | 38°F | 94°F 1954 | 26°F 1960 | 39% | 0% |
| May 20 | 68°F | 38°F | 89°F 2008 | 20°F 1953 | 39% | 0% |
| May 21 | 68°F | 38°F | 89°F 1905 | 28°F 1987 | 39% | 0% |
| May 22 | 68°F | 39°F | 92°F 1967 | 24°F 1960 | 39% | 0% |
| May 23 | 68°F | 39°F | 89°F 1956 | 24°F 1964 | 39% | 0% |
| May 24 | 69°F | 39°F | 91°F 2003 | 31°F 2013 | 39% | 0% |
| May 25 | 69°F | 39°F | 94°F 2003 | 22°F 1975 | 38% | 0% |
| May 26 | 69°F | 39°F | 93°F 1992 | 27°F 1964 | 38% | 0% |
| May 27 | 69°F | 40°F | 94°F 1986 | 32°F 1973 | 38% | 0% |
| May 28 | 69°F | 40°F | 95°F 1983 | 32°F 1960 | 38% | 0% |
| May 29 | 70°F | 40°F | 98°F 1983 | 30°F 1959 | 37% | 0% |
| May 30 | 70°F | 40°F | 97°F 1983 | 22°F 1906 | 37% | 0% |
| May 31 | 70°F | 40°F | 98°F 1986 | 31°F 1984 | 37% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- May 1
- sunrise 5:46 AM, sunset 8:01 PM
- May 31
- sunrise 5:15 AM, sunset 8:33 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00354291 (John Day), public domain. Records: NOAA GHCN-Daily, station USC00354291, 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.