Best year time to visit Issaquah

General weather information about Issaquah

Average annual temperature is 11.0 °C

Absolute maximum temperature: 34.0 °C

Absolute minimum temperature: -6.5 °C

Number of sunny days: 158 days

Number of rainy days: 205 days

Number of snow days: 2 days

Look at detailed online map of Issaquah

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

Issaquah air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)12.813.617.826.932.029.830.934.027.528.015.514.1
Average daytime temperature (°C)8.37.711.012.721.622.927.027.421.416.710.810.1
Average temperature (°C)5.03.65.57.514.915.819.420.115.011.36.47.0
Average night temperature (°C)2.50.71.73.99.410.112.714.210.77.63.34.5
Absolute minimum temperature (°C)-5.4-6.5-4.3-0.95.07.210.510.45.7-3.4-3.9-1.3

Issaquah monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.010.012.014.015.015.015.014.013.011.010.08.0
Daylight mean duration (h)8.910.311.913.615.115.915.514.212.610.99.38.5
Daylight minimum duration (h)8.09.011.012.014.015.014.013.011.010.08.08.0
Sunshine mean duration (h)3.84.77.16.310.411.212.911.37.86.55.33.1
Precipitation (mm)11910111019534401142108110236302
Sunny days5995162027191215147
Rainy days25182225151041218161624
Snow days110000000000

Issaquah - weather forecast by months

Issaquah weather in januaryIssaquah weather in februaryIssaquah weather in marchIssaquah weather in aprilIssaquah weather in mayIssaquah weather in juneIssaquah weather in julyIssaquah weather in augustIssaquah weather in septemberIssaquah weather in octoberIssaquah weather in novemberIssaquah weather in december

Best time to visit Issaquah:

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

  • May — 10.4(h)
  • June — 11.2(h)
  • July — 12.9(h)
  • August — 11.3(h)

Months with the longest average daylight duration in Issaquah:

  • June — 15.9(h)
  • July — 15.5(h)

The largest precipitation sum in Issaquah is at

  • April — 195(mm)
  • November — 236(mm)
  • December — 302(mm)

    • Weather forecast in the closest to Issaquah admin centers

    Weather forecast in the closest towns to Issaquah

    Explore Issaquah

    See also
    MapTrains schedule
    Plan your trip
    AccommodationExperiencesBlog

    Frequently asked questions

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