Diablo Lake Weather Forecast

    • 53
    • 68

    Increasing Clouds

    • 49
    • 68

    Becoming Sunny

    • 55
    • 77

    Sunny

    • 58
    • 80

    Mostly Sunny

    • 57
    • 79

    Chance Rain

    • 56
    • 74

    Chance Rain

    • 60
    • 81

    Mostly Sunny

Today 11 Jul Foothills and Valleys of the North Cascades

Mostly sunny. Highs in the upper 60s to mid 70s. Light wind.

Tonight 11 Jul Foothills and Valleys of the North Cascades

Partly cloudy in the Evening, then mostly cloudy with a chance of Showers after midnight. Lows in the lower 50s. Light wind becoming south to 10 Mph after midnight.

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Diablo Lake Temperature Statistics

July Temperature

Arlington Municipal Airport (60.9 miles)

  • Lowest 5 July, 2026

    46.4 °F

  • Average July

    61.1 °F

  • Highest 6 July, 2026

    81 °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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