Weather in Seattle in August

General weather information about Seattle

Average annual temperature is 11.0 °C

Absolute maximum temperature: 31.3 °C

Absolute minimum temperature: -5.5 °C

Number of sunny days: 174 days

Number of rainy days: 189 days

Number of snow days: 2 days

Look at detailed online map of Seattle

* Weather data for Seattle United States is based on climate observations for 2026 year

Seattle air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)12.612.515.322.828.527.929.031.326.722.815.314.2
Average daytime temperature (°C)8.37.610.112.020.021.625.525.820.615.510.09.5
Average temperature (°C)5.34.15.67.714.315.519.019.715.311.36.96.7
Average night temperature (°C)2.91.82.44.910.111.314.015.312.28.54.74.5
Absolute minimum temperature (°C)-4.3-5.5-1.91.46.78.311.912.88.60.4-1.8-1.5

Seattle monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.010.012.014.015.015.015.014.013.011.09.08.0
Daylight mean duration (h)8.910.311.913.615.115.915.514.212.610.99.38.5
Daylight minimum duration (h)8.09.011.012.014.015.015.013.011.010.08.08.0
Sunshine mean duration (h)3.64.97.47.010.711.413.211.38.26.35.52.9
Precipitation (mm)115637913620335297885140218
Sunny days410127212126191516167
Rainy days2617192310951215151424
Snow days110000000000

Seattle - weather forecast by months

Seattle weather in januarySeattle weather in februarySeattle weather in marchSeattle weather in aprilSeattle weather in maySeattle weather in juneSeattle weather in julySeattle weather in augustSeattle weather in septemberSeattle weather in octoberSeattle weather in novemberSeattle weather in december

Best time to visit Seattle:

The best time to visit Seattle during the most sunny months:

  • May — 10.7(h)
  • June — 11.4(h)
  • July — 13.2(h)
  • August — 11.3(h)

Months with the longest average daylight duration in Seattle:

  • June — 15.9(h)
  • July — 15.5(h)

The largest precipitation sum in Seattle is at

  • January — 115(mm)
  • April — 136(mm)
  • November — 140(mm)
  • December — 218(mm)

    • Weather forecast in the closest to Seattle admin centers

    Weather forecast in the closest towns to Seattle

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    MapTrains schedule
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    Frequently asked questions

    When is the best time to visit Seattle?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Seattle.
    What is the weather like in Seattle?
    See average temperature, rainfall and daylight hours for Seattle by month in the table above.
    How many sunny days does Seattle have?
    The monthly weather statistics above show sunshine and rainfall patterns for Seattle throughout the year.