Snohomish County climate

Snohomish County Weather in August

NOAA 1991-2020 normals for Startup 1 E, 20 km from Snohomish County

Average highs run from 80°F on August 1 to 76°F on August 31, and lows from 52°F to 50°F. Normal precipitation for the month is 1.70 in over about 7 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 Snohomish County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
78°F
Average low
51°F
Precipitation
1.70 in
Record high
103°FAug 16, 2020
Record low
39°FAug 25, 2017
Chance of a freeze
0%
Days of 90°F or more
1.6
Daylight
14 h 59 min to 13 h 26 min
Cloud cover
48%
Humidity
77%
Dew point
49°F
Wind
3.1 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
Aug 180°F52°F96°F 201545°F 201118%0%
Aug 280°F52°F90°F 201548°F 201218%0%
Aug 380°F52°F92°F 201746°F 201618%0%
Aug 480°F52°F94°F 201241°F 201619%0%
Aug 580°F52°F92°F 201247°F 201319%0%
Aug 680°F52°F85°F 201845°F 201519%0%
Aug 779°F52°F92°F 201846°F 201619%0%
Aug 879°F52°F94°F 201845°F 201419%0%
Aug 979°F52°F93°F 197846°F 201419%0%
Aug 1079°F52°F90°F 201848°F 201220%0%
Aug 1179°F52°F96°F 201447°F 201520%0%
Aug 1279°F52°F90°F 201643°F 202020%0%
Aug 1379°F52°F90°F 201640°F 201720%0%
Aug 1479°F52°F86°F 201240°F 201720%0%
Aug 1579°F52°F89°F 201240°F 201721%0%
Aug 1679°F52°F103°F 202042°F 201521%0%
Aug 1779°F52°F92°F 201245°F 201521%0%
Aug 1878°F51°F89°F 201644°F 201722%0%
Aug 1978°F51°F93°F 201643°F 201522%0%
Aug 2078°F51°F91°F 201643°F 201722%0%
Aug 2178°F51°F88°F 201844°F 201523%0%
Aug 2278°F51°F89°F 201842°F 201623%0%
Aug 2378°F51°F82°F 201443°F 201524%0%
Aug 2478°F51°F85°F 201641°F 201524%0%
Aug 2577°F51°F89°F 201639°F 201725%0%
Aug 2677°F50°F94°F 201642°F 201726%0%
Aug 2777°F50°F89°F 201742°F 201726%0%
Aug 2877°F50°F89°F 201745°F 201127%0%
Aug 2977°F50°F91°F 201744°F 202027%0%
Aug 3077°F50°F82°F 201343°F 201228%0%
Aug 3176°F50°F83°F 201943°F 201129%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Snohomish County, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

August 1
sunrise 5:43 AM, sunset 8:42 PM
August 31
sunrise 6:24 AM, sunset 7:50 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00458034 (Startup 1 E), public domain. Records: NOAA GHCN-Daily, station USC00450257, 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.