Island Mountain Weather Forecast

    • 61
    • 83

    Sunny

    • 63
    • 87

    Sunny

    • 67
    • 92

    Mostly Sunny

    • 66
    • 91

    Mostly Sunny

    • 66
    • 88

    Sunny

    • 64
    • 88

    Mostly Sunny

Today 20 Aug Northeastern Mendocino Interior

Sunny. Highs 87 to 102.

Tonight 20 Aug Northeastern Mendocino Interior

Clear. Lows 56 to 66.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Island Mountain Temperature Statistics

August Temperature

Fortuna Rohnerville Airport (52.8 miles)

  • Lowest 10 August, 2025

    48.2 °F

  • Average August

    59.2 °F

  • Highest 6 August, 2025

    75.2 °F

Climate (2020–Present)

Fortuna Rohnerville Airport (52.8 miles)

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  • Average Low 2020–2025

    45.1 °F

  • Average 2020–2025

    51.2 °F

  • Average High 2020–2025

    59.6 °F
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