Issaquah Weather Forecast

    • 39
    • 47

    Rain Showers

    • 35
    • 46

    Rain Showers

    • 33
    • 42

    Mostly Cloudy

    • 34
    • 44

    Mostly Cloudy

    • 36
    • 48

    Mostly Cloudy

    • 38
    • 50

    Mostly Cloudy

Today 25 Dec Eastside

Mostly cloudy in the Morning, then a chance of rain Showers in the afternoon. Patchy fog late in the afternoon. Highs in the 40s. North wind around 10 Mph.

Tonight 25 Dec Eastside

Patchy fog in the evening. Mostly cloudy with a chance of Showers until early Morning, then mostly cloudy with a slight chance of Showers in the morning. Lows near 40. Light wind becoming south around 10 Mph after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Issaquah Temperature Statistics

December Temperature

Renton Municipal Airport (8.7 miles)

  • Lowest 1 December, 2025

    33.1 °F

  • Average December

    47.8 °F

  • Highest 15 December, 2025

    60.1 °F

Climate (2020–Present)

Renton Municipal Airport (8.7 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    54.7 °F

  • Average High 2020–2025

    62.3 °F
Get WillyWeather+ to remove ads