Heppner Weather in May
Average highs run from 65°F on May 1 to 73°F on May 31, and lows from 41°F to 48°F. Normal precipitation for the month is 1.71 in over about 10 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
- 1.71 in
- Record high
- 100°FMay 30, 1903
- Record low
- 25°FMay 1, 1954
- Chance of a freeze
- 31%
- Days of 90°F or more
- 0.6
- Daylight
- 14 h 19 min to 15 h 25 min
- Cloud cover
- 60%
- Humidity
- 58%
- Dew point
- 40°F
- Wind
- 8.7 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 | 65°F | 41°F | 84°F 1998 | 25°F 1954 | 34% | 0% |
| May 2 | 65°F | 41°F | 89°F 1947 | 27°F 1965 | 34% | 0% |
| May 3 | 66°F | 41°F | 86°F 1909 | 29°F 1919 | 34% | 0% |
| May 4 | 66°F | 42°F | 88°F 1966 | 28°F 1962 | 34% | 0% |
| May 5 | 66°F | 42°F | 89°F 1966 | 28°F 1937 | 33% | 0% |
| May 6 | 67°F | 42°F | 91°F 1966 | 29°F 1965 | 33% | 0% |
| May 7 | 67°F | 42°F | 95°F 1992 | 28°F 1903 | 33% | 0% |
| May 8 | 67°F | 43°F | 91°F 1987 | 29°F 2002 | 33% | 0% |
| May 9 | 68°F | 43°F | 92°F 1987 | 30°F 1922 | 33% | 0% |
| May 10 | 68°F | 43°F | 88°F 1987 | 29°F 1999 | 33% | 0% |
| May 11 | 68°F | 43°F | 90°F 1924 | 28°F 1916 | 33% | 0% |
| May 12 | 69°F | 44°F | 91°F 1931 | 28°F 1943 | 33% | 0% |
| May 13 | 69°F | 44°F | 93°F 1988 | 31°F 1908 | 33% | 0% |
| May 14 | 69°F | 44°F | 91°F 1973 | 28°F 1964 | 33% | 0% |
| May 15 | 69°F | 45°F | 92°F 1973 | 30°F 1943 | 33% | 0% |
| May 16 | 70°F | 45°F | 88°F 1973 | 31°F 1917 | 33% | 0% |
| May 17 | 70°F | 45°F | 92°F 2006 | 32°F 1906 | 33% | 0% |
| May 18 | 70°F | 45°F | 95°F 2006 | 31°F 1983 | 33% | 0% |
| May 19 | 71°F | 45°F | 93°F 2006 | 30°F 1987 | 33% | 0% |
| May 20 | 71°F | 46°F | 90°F 2023 | 33°F 1898 | 33% | 0% |
| May 21 | 71°F | 46°F | 92°F 1928 | 31°F 1903 | 33% | 0% |
| May 22 | 71°F | 46°F | 88°F 1910 | 31°F 1960 | 33% | 0% |
| May 23 | 71°F | 46°F | 92°F 1910 | 29°F 1964 | 32% | 0% |
| May 24 | 72°F | 46°F | 97°F 2001 | 32°F 1898 | 32% | 0% |
| May 25 | 72°F | 47°F | 91°F 1999 | 30°F 1918 | 32% | 0% |
| May 26 | 72°F | 47°F | 90°F 1947 | 30°F 1918 | 32% | 0% |
| May 27 | 72°F | 47°F | 93°F 1947 | 30°F 1921 | 31% | 0% |
| May 28 | 72°F | 47°F | 94°F 1983 | 31°F 1954 | 31% | 0% |
| May 29 | 73°F | 47°F | 93°F 1983 | 30°F 1951 | 31% | 0% |
| May 30 | 73°F | 47°F | 100°F 1903 | 32°F 1902 | 30% | 0% |
| May 31 | 73°F | 48°F | 98°F 1986 | 29°F 1898 | 30% | 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 8:05 PM
- May 31
- sunrise 5:14 AM, sunset 8:39 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00353827 (Heppner), public domain. Records: NOAA GHCN-Daily, station USC00353827, 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.