Keystone Weather Forecast

    • 54
    • 70

    Becoming Sunny

    • 55
    • 70

    Mostly Sunny

    • 54
    • 70

    Partly Sunny

    • 52
    • 66

    Mostly Cloudy

    • 52
    • 65

    Partly Sunny

    • 53
    • 66

    Mostly Sunny

Today 22 Jul Island County

Mostly cloudy in the morning then becoming sunny. Highs in the upper 60s to mid 70s. Light wind becoming west around 10 Mph in the afternoon.

Tonight 22 Jul Island County

Mostly clear. Lows in the 50s. West wind to 10 Mph in the evening becoming light.

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Keystone Temperature Statistics

July Temperature

Whidbey Island Naval Air Station - Ault Field (13 miles)

  • Lowest 4 July, 2025

    48 °F

  • Average July

    57.2 °F

  • Highest 16 July, 2025

    77 °F

Climate (2020–Present)

Whidbey Island Naval Air Station - Ault Field (13 miles)

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  • Average Low 2020–2025

    44.6 °F

  • Average 2020–2025

    50.2 °F

  • Average High 2020–2025

    56.2 °F
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