Diablo Lake Weather Forecast

    • 39
    • 50

    Becoming Sunny

    • 36
    • 50

    Mostly Sunny

    • 36
    • 49

    Mostly Sunny

    • 37
    • 52

    Sunny

    • 37
    • 53

    Sunny

    • 35
    • 52

    Mostly Sunny

Today 13 Jan Foothills and Valleys of the North Cascades

Mostly cloudy. A slight chance of rain in the morning. Patchy dense fog in the morning. Highs in the mid 50s to lower 60s. Light wind.

Tonight 13 Jan Foothills and Valleys of the North Cascades

Mostly cloudy in the evening then becoming clear. Patchy dense fog late in the evening. Widespread dense fog after midnight. Lows in the lower 40s. Light wind.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Diablo Lake Temperature Statistics

January Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 1 January, 2026

    26.6 °F

  • Average January

    42.8 °F

  • Highest 3 January, 2026

    54 °F

Climate (2021–Present)

Arlington Municipal Airport (60.9 miles)

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

  • Average Low 2021–2026

    42.5 °F

  • Average 2021–2026

    50.7 °F

  • Average High 2021–2026

    59.8 °F
Get WillyWeather+ to remove ads