Rock Island Lake Weather Forecast

    • 43
    • 61

    Sunny

    • 50
    • 66

    Increasing Clouds

    • 47
    • 65

    Mostly Sunny

    • 47
    • 64

    Partly Sunny

    • 38
    • 56

    Rain Showers

    • 30
    • 42

    Rain Showers

    • 28
    • 39

    Chance Snow Showers

Today 22 Jun Boise Mountains

Sunny. Highs 72 to 86.

Tonight 22 Jun Boise Mountains

Clear. Lows 39 to 54.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rock Island Lake Temperature Statistics

June Temperature

Stanley, Stanley Ranger Station (19.9 miles)

  • Lowest 11 June, 2026

    20.6 °F

  • Average June

    50.1 °F

  • Highest 19 June, 2026

    81.6 °F

Climate (2021–2026)

Stanley, Stanley Ranger Station (19.9 miles)

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  • Average Low 2021–2026

    23.2 °F

  • Average 2021–2026

    38.5 °F

  • Average High 2021–2026

    54 °F
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