Three Island Lake Weather Forecast

    • 19
    • 23

    Mostly Cloudy

    • 24
    • 32

    Mostly Cloudy

    • 25
    • 35

    Mostly Cloudy

    • 17
    • 35

    Mostly Cloudy

    • 16
    • 28

    Partly Sunny

    • 20
    • 32

    Mostly Sunny

    • 22
    • 36

    Mostly Sunny

Today 29 Jan Boise Mountains

Increasing Clouds. Areas of fog this morning. A 30 percent chance of snow. Highs 32 to 43.

Tonight 29 Jan Boise Mountains

Mostly cloudy. Areas of fog. Lows 19 to 32.

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Three Island Lake Temperature Statistics

January Temperature

Stanley, Stanley Ranger Station (18.6 miles)

  • Lowest 24 January, 2026

    -18.3 °F

  • Average January

    14.2 °F

  • Highest 3 January, 2026

    43.6 °F

Climate (2021–Present)

Stanley, Stanley Ranger Station (18.6 miles)

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  • Average Low 2021–2026

    23.1 °F

  • Average 2021–2026

    38.4 °F

  • Average High 2021–2026

    53.8 °F
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