Keystone Weather Forecast

    • 50
    • 63

    Decreasing Clouds

    • 49
    • 63

    Partly Sunny

    • 50
    • 64

    Mostly Cloudy

    • 50
    • 60

    Mostly Cloudy

    • 50
    • 60

    Partly Sunny

    • 51
    • 61

    Partly Sunny

Today 3 Oct Island County

Partly sunny until late afternoon then becoming sunny. Highs in the 60s. Northwest wind to 10 Mph increasing to 10 to 15 Mph in the afternoon.

Tonight 3 Oct Island County

Mostly clear. Lows in the upper 40s to mid 50s. Northwest wind to 10 Mph in the evening becoming light.

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Keystone Temperature Statistics

October Temperature

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

  • Lowest 1 October, 2026

    48 °F

  • Average October

    53.7 °F

  • Highest 1 October, 2026

    59 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    44.3 °F

  • Average 2021–2026

    49.9 °F

  • Average High 2021–2026

    55.9 °F
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