Northwest Island Weather Forecast

    • 49
    • 63

    Areas Fog

    • 51
    • 66

    Mostly Cloudy

    • 51
    • 63

    Mostly Cloudy

    • 49
    • 62

    Mostly Cloudy

    • 49
    • 56

    Chance Rain

    • 47
    • 55

    Chance Rain

Today 20 Sep Lowlands of Western Skagit and Northwestern Snohomish Counties

Mostly sunny. Areas of fog in the morning. Patchy fog late in the morning. Highs in the 60s. Light wind becoming west to 10 Mph in the afternoon.

Tonight 20 Sep Lowlands of Western Skagit and Northwestern Snohomish Counties

Partly cloudy. Patchy fog in the morning. Lows in the mid 40s to lower 50s. West wind to 10 Mph in the evening becoming light.

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Northwest Island Temperature Statistics

September Temperature

Whidbey Island Naval Air Station - Ault Field (4.3 miles)

  • Lowest 18 September, 2026

    45 °F

  • Average September

    57.1 °F

  • Highest 7 September, 2026

    69.1 °F

Climate (2021–2026)

Whidbey Island Naval Air Station - Ault Field (4.3 miles)

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  • Average Low 2021–2026

    44.4 °F

  • Average 2021–2026

    50 °F

  • Average High 2021–2026

    55.9 °F
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