Three Island State Park Weather Forecast

    • 48
    • 78

    Mostly Sunny

    • 48
    • 79

    Sunny

    • 50
    • 82

    Mostly Sunny

    • 50
    • 85

    Mostly Sunny

    • 52
    • 84

    Mostly Sunny

    • 53
    • 87

    Mostly Sunny

Today 29 Sep Upper Treasure Valley

Sunny. Highs 74 to 79. Northwest Winds 10 to 15 Mph with Gusts to 25 Mph.

Tonight 29 Sep Upper Treasure Valley

Mostly clear. Lows 45 to 51. Northwest Winds 10 to 15 Mph with Gusts to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Three Island State Park Temperature Statistics

September Temperature

Mountain Home Air Force Base (28.6 miles)

  • Lowest 26 September, 2026

    36.6 °F

  • Average September

    64.7 °F

  • Highest 24 September, 2026

    92.6 °F

Climate (2021–2026)

Mountain Home Air Force Base (28.6 miles)

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  • Average Low 2021–2026

    40 °F

  • Average 2021–2026

    52.6 °F

  • Average High 2021–2026

    65.6 °F
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