Umatilla County climate

Umatilla County Weather in August

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

Average highs run from 91°F on August 1 to 83°F on August 31, and lows from 58°F to 53°F. Normal precipitation for the month is 0.31 in over about 2 wet days.

August 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.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
88°F
Average low
56°F
Precipitation
0.31 in
Record high
106°FAug 1, 2009
Record low
44°FAug 8, 2025
Chance of a freeze
0%
Days of 90°F or more
13.4
Daylight
14 h 44 min to 13 h 19 min
Cloud cover
29%
Humidity
47%
Dew point
45°F
Wind
7.6 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
Aug 191°F58°F106°F 200953°F 20067%0%
Aug 291°F58°F102°F 201553°F 20067%0%
Aug 391°F58°F102°F 202447°F 20087%0%
Aug 491°F58°F106°F 202151°F 20267%0%
Aug 591°F58°F100°F 201451°F 20187%0%
Aug 690°F58°F100°F 201253°F 20117%0%
Aug 790°F58°F101°F 201250°F 20207%0%
Aug 890°F58°F104°F 201944°F 20257%0%
Aug 990°F57°F106°F 201851°F 20117%0%
Aug 1089°F57°F105°F 201851°F 20117%0%
Aug 1189°F57°F104°F 201749°F 20077%0%
Aug 1289°F57°F103°F 202152°F 20067%0%
Aug 1389°F57°F102°F 200450°F 20077%0%
Aug 1488°F57°F100°F 201251°F 20247%0%
Aug 1588°F56°F102°F 202149°F 20177%0%
Aug 1688°F56°F103°F 200845°F 20117%0%
Aug 1788°F56°F106°F 200852°F 20067%0%
Aug 1887°F56°F102°F 202352°F 20118%0%
Aug 1987°F56°F101°F 202054°F 20058%0%
Aug 2087°F55°F101°F 200948°F 20108%0%
Aug 2186°F55°F98°F 202652°F 20108%0%
Aug 2286°F55°F100°F 202649°F 20088%0%
Aug 2386°F55°F94°F 202249°F 20108%0%
Aug 2485°F55°F96°F 202547°F 20098%0%
Aug 2585°F54°F96°F 202548°F 20189%0%
Aug 2685°F54°F97°F 202550°F 20089%0%
Aug 2785°F54°F94°F 200648°F 20079%0%
Aug 2884°F54°F101°F 202344°F 20109%0%
Aug 2984°F53°F100°F 201748°F 20249%0%
Aug 3084°F53°F101°F 200745°F 20269%0%
Aug 3183°F53°F97°F 202244°F 200610%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.02468101102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

August 1
sunrise 5:39 AM, sunset 8:23 PM
August 31
sunrise 6:15 AM, sunset 7:34 PM

Every day of August: 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.