Island Mountain Weather Forecast

    • 49
    • 73

    Mostly Sunny

    • 52
    • 77

    Partly Sunny

    • 50
    • 77

    Chance Rain

    • 45
    • 65

    Partly Sunny

    • 45
    • 70

    Mostly Sunny

    • 45
    • 67

    Mostly Sunny

Today 22 Sep Northeastern Interior Mendocino

Sunny. Highs 79 to 94.

Tonight 22 Sep Northeastern Interior Mendocino

Mostly clear. Lows 48 to 58.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Island Mountain Temperature Statistics

September Temperature

Fortuna Rohnerville Airport (52.8 miles)

  • Lowest 4 September, 2026

    46.4 °F

  • Average September

    57.7 °F

  • Highest 9 September, 2026

    82.4 °F

Climate (2021–2026)

Fortuna Rohnerville Airport (52.8 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    45.4 °F

  • Average 2021–2026

    51.4 °F

  • Average High 2021–2026

    59.8 °F
Get WillyWeather+ to remove ads