Three Island Lake Weather Forecast

    • 37
    • 48

    Rain Showers

    • 39
    • 47

    Chance Thunderstorms

    • 39
    • 55

    Mostly Sunny

    • 40
    • 54

    Partly Sunny

    • 39
    • 54

    Mostly Sunny

    • 39
    • 54

    Mostly Sunny

Today 18 Sep Boise Mountains

Areas of fog in the morning. Rain Showers with a chance of Thunderstorms. Chance of rain 80 percent. Highs 59 to 74.

Tonight 18 Sep Boise Mountains

A chance of Thunderstorms in the evening. Mostly cloudy with a chance of rain Showers. Patchy fog in the evening. Areas of fog after midnight. Chance of rain 40 percent. Lows 38 to 52.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Three Island Lake Temperature Statistics

September Temperature

Stanley, Stanley Ranger Station (18.6 miles)

  • Lowest 15 September, 2026

    21.9 °F

  • Average September

    50.1 °F

  • Highest 1 September, 2026

    77.6 °F

Climate (2021–2026)

Stanley, Stanley Ranger Station (18.6 miles)

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

  • Average Low 2021–2026

    23.2 °F

  • Average 2021–2026

    38.4 °F

  • Average High 2021–2026

    53.9 °F
Get WillyWeather+ to remove ads