Tri-Cities climate

Tri-Cities Weather in August

NOAA 1991-2020 normals for Pasco Tri Cities AP, 6.6 km from Tri-Cities

Average highs run from 94°F on August 1 to 87°F on August 31, and lows from 58°F to 52°F. Normal precipitation for the month is 0.27 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 Tri-Cities, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
91°F
Average low
56°F
Precipitation
0.27 in
Record high
111°FAug 4, 1998
Record low
40°FAug 31, 2008
Chance of a freeze
0%
Days of 90°F or more
18.8
Daylight
14 h 48 min to 13 h 21 min
Cloud cover
31%
Humidity
42%
Dew point
47°F
Wind
7.8 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 194°F58°F109°F 200945°F 20026%0%
Aug 294°F58°F107°F 202449°F 20066%0%
Aug 394°F58°F105°F 199844°F 20026%0%
Aug 494°F58°F111°F 199848°F 20266%0%
Aug 593°F58°F106°F 199843°F 20026%0%
Aug 693°F58°F105°F 194549°F 20066%0%
Aug 793°F58°F104°F 201244°F 20026%0%
Aug 893°F58°F105°F 201846°F 20026%0%
Aug 993°F58°F105°F 201848°F 20026%0%
Aug 1092°F57°F106°F 201848°F 20076%0%
Aug 1192°F57°F107°F 202144°F 20076%0%
Aug 1292°F57°F104°F 201547°F 20006%0%
Aug 1392°F57°F104°F 200448°F 20077%0%
Aug 1491°F57°F105°F 202346°F 20057%0%
Aug 1591°F56°F109°F 202348°F 20007%0%
Aug 1691°F56°F107°F 202344°F 20117%0%
Aug 1791°F56°F106°F 202046°F 20027%0%
Aug 1890°F56°F106°F 202247°F 20027%0%
Aug 1990°F55°F101°F 202246°F 20057%0%
Aug 2090°F55°F100°F 200445°F 20007%0%
Aug 2190°F55°F102°F 202245°F 20007%0%
Aug 2289°F54°F100°F 194546°F 20007%0%
Aug 2389°F54°F99°F 194545°F 20108%0%
Aug 2489°F54°F101°F 202543°F 20218%0%
Aug 2588°F54°F97°F 201143°F 20128%0%
Aug 2688°F53°F100°F 202646°F 20088%0%
Aug 2788°F53°F99°F 201145°F 19458%0%
Aug 2888°F53°F103°F 202343°F 20248%0%
Aug 2987°F53°F100°F 199843°F 20248%0%
Aug 3087°F52°F99°F 200745°F 20128%0%
Aug 3187°F52°F99°F 202240°F 20088%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Tri-Cities, 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 8:27 PM
August 31
sunrise 6:16 AM, sunset 7:37 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024163 (Pasco Tri Cities AP), public domain. Records: NOAA GHCN-Daily, station USW00024163, 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.