Diablo Lake Weather Forecast

    • 56
    • 72

    Mostly Sunny

    • 54
    • 69

    Slight Chance Rain

    • 52
    • 73

    Mostly Sunny

    • 54
    • 77

    Mostly Sunny

    • 57
    • 79

    Mostly Sunny

    • 53
    • 72

    Slight Chance Rain

Today 27 Jul Foothills and Valleys of the North Cascades

Partly sunny until late afternoon then becoming sunny. Patchy fog in the morning. Highs in the mid 70s to lower 80s. South wind to 10 Mph.

Tonight 27 Jul Foothills and Valleys of the North Cascades

Partly cloudy. Lows in the mid to upper 50s. Light wind becoming southeast to 10 Mph after Midnight, Gusts to 20 Mph after midnight.

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Diablo Lake Temperature Statistics

July Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 13 July, 2026

    44.6 °F

  • Average July

    63.9 °F

  • Highest 22 July, 2026

    93 °F

Climate (2021–2026)

Arlington Municipal Airport (60.9 miles)

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  • Average Low 2021–2026

    42.6 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    59.9 °F
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