Fort Casey Weather Forecast

    • 54
    • 80

    Becoming Sunny

    • 52
    • 72

    Mostly Sunny

    • 52
    • 69

    Partly Sunny

    • 51
    • 70

    Partly Sunny

    • 52
    • 68

    Rain Likely

    • 52
    • 69

    Chance Rain

Today 16 Sep Island County

Sunny. Highs in the mid 70s to lower 80s. Light wind becoming southeast to 10 Mph in the afternoon.

Tonight 16 Sep Island County

Clear. Areas of smoke late in the evening. Lows in the 50s to lower 60s. Southeast wind to 10 Mph with Gusts to 25 Mph.

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Fort Casey Temperature Statistics

September Temperature

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

  • Lowest 10 September, 2025

    50 °F

  • Average September

    57 °F

  • Highest 13 September, 2025

    66.9 °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

    50.1 °F

  • Average High 2020–2025

    56.1 °F
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