Umatilla County climate

Umatilla County Weather in May

NOAA 1991-2020 normals for Pendleton, 14.2 km from Umatilla County

Average highs run from 67°F on May 1 to 74°F on May 31, and lows from 41°F to 48°F. Normal precipitation for the month is 1.45 in over about 10 wet days.

May day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Umatilla County, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

May at a glance

Average high
71°F
Average low
45°F
Precipitation
1.45 in
Record high
97°FMay 17, 2008
Record low
30°FMay 2, 2008
Chance of a freeze
33%
Days of 90°F or more
0.8
Daylight
14 h 19 min to 15 h 26 min
Cloud cover
60%
Humidity
63%
Dew point
40°F
Wind
8.1 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.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
May 167°F41°F78°F 202131°F 201131%0%
May 267°F42°F85°F 201430°F 200831%0%
May 367°F42°F86°F 201633°F 200631%0%
May 468°F42°F89°F 201635°F 201031%0%
May 568°F42°F91°F 201734°F 201231%0%
May 668°F43°F82°F 202635°F 201031%0%
May 769°F43°F84°F 201335°F 200331%0%
May 869°F43°F92°F 200735°F 201031%0%
May 969°F43°F87°F 201335°F 200631%0%
May 1070°F44°F89°F 201333°F 201231%0%
May 1170°F44°F93°F 201333°F 201231%0%
May 1270°F44°F91°F 201338°F 201231%0%
May 1370°F44°F85°F 201334°F 200931%0%
May 1471°F45°F85°F 201337°F 201731%0%
May 1571°F45°F89°F 200637°F 201731%0%
May 1671°F45°F94°F 200636°F 200331%0%
May 1772°F45°F97°F 200837°F 202631%0%
May 1872°F46°F93°F 200638°F 200331%0%
May 1972°F46°F91°F 200636°F 200331%0%
May 2072°F46°F91°F 202339°F 201031%0%
May 2172°F46°F92°F 202336°F 202231%0%
May 2273°F47°F82°F 202340°F 201030%0%
May 2373°F47°F87°F 201435°F 201330%0%
May 2473°F47°F91°F 201738°F 201030%0%
May 2573°F47°F87°F 201842°F 200530%0%
May 2673°F47°F85°F 202539°F 201130%0%
May 2774°F48°F90°F 200542°F 201129%0%
May 2874°F48°F92°F 200536°F 201129%0%
May 2974°F48°F92°F 200941°F 201129%0%
May 3074°F48°F93°F 201541°F 201029%0%
May 3174°F48°F90°F 201743°F 202428%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Umatilla County, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

May 1
sunrise 5:43 AM, sunset 8:02 PM
May 31
sunrise 5:10 AM, sunset 8:36 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024155 (Pendleton), public domain. Records: NOAA GHCN-Daily, station USC00356550, 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.