Three Island Lake Weather Forecast

    • 49
    • 65

    Areas Smoke

    • 52
    • 67

    Areas Smoke

    • 51
    • 68

    Partly Sunny

    • 50
    • 66

    Partly Sunny

    • 49
    • 65

    Mostly Sunny

    • 49
    • 64

    Partly Sunny

    • 46
    • 61

    Chance Rain Showers

Today 31 Aug Boise Mountains

Sunny. Patchy smoke. Highs 78 to 93.

Tonight 31 Aug Boise Mountains

Mostly clear. Areas of smoke. Lows 47 to 62.

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Three Island Lake Temperature Statistics

August Temperature

Stanley, Stanley Ranger Station (18.6 miles)

  • Lowest 8 August, 2025

    30.8 °F

  • Average August

    59 °F

  • Highest 19 August, 2025

    89.7 °F

Climate (2020–Present)

Stanley, Stanley Ranger Station (18.6 miles)

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  • Average Low 2020–2025

    22.6 °F

  • Average 2020–2025

    38 °F

  • Average High 2020–2025

    53.6 °F
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