Diablo Lake Weather Forecast

    • 41
    • 58

    Increasing Clouds

    • 45
    • 66

    Mostly Cloudy

    • 37
    • 63

    Chance Rain/Snow

    • 31
    • 45

    Chance Rain

    • 32
    • 50

    Slight Chance Rain

    • 34
    • 53

    Mostly Sunny

Today 4 Apr Foothills and Valleys of the North Cascades

Sunny. Highs in the upper 50s to mid 60s. Light wind becoming northwest to 10 Mph in the afternoon.

Tonight 4 Apr Foothills and Valleys of the North Cascades

Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower to mid 40s. Northwest wind to 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Diablo Lake Temperature Statistics

April Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 1 April, 2026

    42.1 °F

  • Average April

    46.5 °F

  • Highest 1 April, 2026

    50 °F

Climate (2021–Present)

Arlington Municipal Airport (60.9 miles)

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  • Average Low 2021–2026

    42.6 °F

  • Average 2021–2026

    50.8 °F

  • Average High 2021–2026

    59.9 °F
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