Three Island Lake Weather Forecast

    • 35
    • 45

    Becoming Sunny

    • 36
    • 47

    Mostly Sunny

    • 22
    • 41

    Chance Rain/Snow

    • 27
    • 38

    Partly Sunny

    • 31
    • 41

    Mostly Cloudy

    • 31
    • 46

    Chance Rain/Snow

Today 19 Mar Boise Mountains

Sunny. Highs 60 to 75.

Tonight 19 Mar Boise Mountains

Mostly clear. Lows 35 to 50.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Three Island Lake Temperature Statistics

March Temperature

Stanley, Stanley Ranger Station (18.6 miles)

  • Lowest 15 March, 2026

    7 °F

  • Average March

    30.8 °F

  • Highest 8 March, 2026

    48.9 °F

Climate (2021–Present)

Stanley, Stanley Ranger Station (18.6 miles)

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  • Average Low 2021–2026

    23.2 °F

  • Average 2021–2026

    38.5 °F

  • Average High 2021–2026

    53.9 °F
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