Frost Island Weather Forecast

    • 49
    • 60

    Rain Likely

    • 51
    • 60

    Partly Sunny

    • 52
    • 63

    Partly Sunny

    • 51
    • 64

    Partly Sunny

    • 49
    • 58

    Mostly Cloudy

    • 49
    • 61

    Partly Sunny

Today 25 May San Juan County

Breezy. Cloudy with a slight chance of rain in the Morning, then mostly cloudy with a chance of rain in the afternoon. Highs in the 60s. Southeast wind 15 to 25 Mph with Gusts to 35 Mph.

Tonight 25 May San Juan County

Mostly cloudy with rain likely in the Evening, then mostly cloudy with a chance of rain in the late evening and early morning. Mostly cloudy in the morning. Rainfall Amounts less than a tenth of an inch likely. Lows in the mid 40s to lower 50s. Southeast wind to 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Frost Island Temperature Statistics

May Temperature

Friday Harbor Airport (8.1 miles)

  • Lowest 17 May, 2026

    41 °F

  • Average May

    55 °F

  • Highest 3 May, 2026

    75.9 °F

Climate (2021–Present)

Friday Harbor Airport (8.1 miles)

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  • Average Low 2021–2026

    44.5 °F

  • Average 2021–2026

    51.9 °F

  • Average High 2021–2026

    59.7 °F
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