Umatilla Weather in May
Average highs run from 83°F on May 1 to 88°F on May 31, and lows from 62°F to 68°F. Normal precipitation for the month is 3.37 in over about 7 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
- 86°F
- Average low
- 65°F
- Precipitation
- 3.37 in
- Record high
- 98°FMay 28, 2000
- Record low
- 51°FMay 1, 1999
- Chance of a freeze
- 0%
- Days of 90°F or more
- 7.9
- Daylight
- 13 h 18 min to 13 h 51 min
- Cloud cover
- 48%
- Humidity
- 68%
- Dew point
- 64°F
- Wind
- 7.6 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 | 83°F | 62°F | 94°F 2017 | 51°F 1999 | 19% |
| May 2 | 84°F | 62°F | 92°F 2002 | 55°F 1999 | 19% |
| May 3 | 84°F | 63°F | 96°F 2002 | 57°F 1999 | 19% |
| May 4 | 84°F | 63°F | 95°F 2002 | 57°F 2004 | 19% |
| May 5 | 84°F | 63°F | 94°F 2021 | 54°F 2004 | 19% |
| May 6 | 84°F | 63°F | 93°F 2007 | 53°F 2016 | 19% |
| May 7 | 84°F | 63°F | 94°F 2026 | 52°F 2017 | 19% |
| May 8 | 85°F | 64°F | 94°F 2009 | 58°F 2007 | 20% |
| May 9 | 85°F | 64°F | 96°F 2009 | 60°F 2001 | 20% |
| May 10 | 85°F | 64°F | 96°F 2009 | 59°F 2022 | 20% |
| May 11 | 85°F | 64°F | 95°F 2009 | 60°F 2001 | 21% |
| May 12 | 85°F | 64°F | 94°F 2000 | 60°F 2001 | 21% |
| May 13 | 85°F | 65°F | 95°F 1998 | 60°F 2013 | 22% |
| May 14 | 86°F | 65°F | 94°F 2000 | 52°F 2013 | 22% |
| May 15 | 86°F | 65°F | 93°F 2000 | 58°F 2021 | 23% |
| May 16 | 86°F | 65°F | 94°F 2003 | 59°F 2021 | 23% |
| May 17 | 86°F | 65°F | 94°F 2003 | 61°F 2006 | 24% |
| May 18 | 86°F | 66°F | 93°F 2002 | 59°F 2011 | 25% |
| May 19 | 86°F | 66°F | 93°F 2015 | 60°F 2011 | 25% |
| May 20 | 86°F | 66°F | 95°F 2011 | 57°F 2007 | 26% |
| May 21 | 87°F | 66°F | 96°F 2020 | 59°F 2002 | 27% |
| May 22 | 87°F | 67°F | 97°F 2020 | 59°F 2002 | 28% |
| May 23 | 87°F | 67°F | 95°F 2020 | 62°F 2002 | 29% |
| May 24 | 87°F | 67°F | 95°F 2000 | 63°F 2002 | 29% |
| May 25 | 87°F | 67°F | 96°F 2000 | 62°F 2002 | 30% |
| May 26 | 87°F | 67°F | 97°F 2000 | 60°F 2017 | 31% |
| May 27 | 87°F | 68°F | 97°F 2000 | 61°F 2017 | 32% |
| May 28 | 87°F | 68°F | 98°F 2000 | 60°F 2023 | 33% |
| May 29 | 87°F | 68°F | 96°F 2024 | 63°F 2023 | 34% |
| May 30 | 88°F | 68°F | 95°F 2004 | 65°F 2023 | 35% |
| May 31 | 88°F | 68°F | 95°F 2001 | 65°F 2000 | 36% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- May 1
- sunrise 6:45 AM, sunset 8:03 PM
- May 31
- sunrise 6:29 AM, sunset 8:20 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00085076 (Lisbon), public domain. Records: NOAA GHCN-Daily, station USW00012819, 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.