Rosario Head Weather Forecast

    • 50
    • 58

    Decreasing Clouds

    • 50
    • 56

    Rain

    • 49
    • 55

    Rain

    • 48
    • 57

    Mostly Cloudy

    • 48
    • 55

    Mostly Cloudy

    • 50
    • 56

    Chance Rain

Today 23 Sep Lowlands of Western Skagit and Northwestern Snohomish Counties

Mostly cloudy. A slight chance of rain in the late morning and early afternoon. Highs in the upper 50s to mid 60s. Light wind.

Tonight 23 Sep Lowlands of Western Skagit and Northwestern Snohomish Counties

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid 40s to lower 50s. Light wind.

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  • Temperature Real-Time

Rosario Head Temperature Statistics

September Temperature

Whidbey Island Naval Air Station - Ault Field (3.7 miles)

  • Lowest 18 September, 2026

    45 °F

  • Average September

    56.8 °F

  • Highest 7 September, 2026

    69.1 °F

Climate (2021–2026)

Whidbey Island Naval Air Station - Ault Field (3.7 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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