Rock Island Lake Weather Forecast

    • 31
    • 48

    Mostly Sunny

    • 29
    • 47

    Partly Sunny

    • 33
    • 48

    Mostly Sunny

    • 40
    • 53

    Mostly Sunny

    • 38
    • 54

    Mostly Sunny

    • 40
    • 57

    Mostly Sunny

    • 36
    • 54

    Mostly Sunny

Today 7 May Boise Mountains

Sunny. Highs 62 to 77. Breezy.

Tonight 7 May Boise Mountains

Mostly clear. Lows 32 to 47.

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Rock Island Lake Temperature Statistics

May Temperature

Stanley, Stanley Ranger Station (19.9 miles)

  • Lowest 1 May, 2026

    19.7 °F

  • Average May

    44.9 °F

  • Highest 4 May, 2026

    68.6 °F

Climate (2021–Present)

Stanley, Stanley Ranger Station (19.9 miles)

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  • Average Low 2021–2026

    23.3 °F

  • Average 2021–2026

    38.6 °F

  • Average High 2021–2026

    54 °F
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