Sugarloaf Island Weather Forecast

    • 57
    • 60

    Mostly Cloudy

    • 57
    • 60

    Mostly Cloudy

    • 58
    • 61

    Chance Rain Showers

    • 56
    • 60

    Partly Sunny

    • 56
    • 59

    Mostly Sunny

    • 56
    • 60

    Partly Sunny

    • 55
    • 60

    Partly Sunny

Today 11 Sep Southwestern Humboldt

Mostly cloudy early in the morning then becoming mostly sunny. Highs 65 to 80. Northwest wind 5 to 15 Mph.

Tonight 11 Sep Southwestern Humboldt

Partly cloudy. Lows 51 to 61. North wind 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sugarloaf Island Temperature Statistics

September Temperature

Fortuna Rohnerville Airport (16.2 miles)

  • Lowest 7 September, 2025

    51.8 °F

  • Average September

    58.4 °F

  • Highest 6 September, 2025

    68 °F

Climate (2020–Present)

Fortuna Rohnerville Airport (16.2 miles)

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  • Average Low 2020–2025

    45.1 °F

  • Average 2020–2025

    51.2 °F

  • Average High 2020–2025

    59.5 °F
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