Arrowrock Reservoir Weather Forecast

    • 38
    • 61

    Sunny

    • 38
    • 67

    Sunny

    • 45
    • 72

    Mostly Sunny

    • 50
    • 76

    Mostly Sunny

    • 43
    • 74

    Chance Rain Showers

    • 35
    • 59

    Chance Rain Showers

Today 6 Oct Boise Mountains

Widespread frost with patchy fog this morning. Sunny. Highs 51 to 65.

Tonight 6 Oct Boise Mountains

Mostly clear. Widespread frost. Lows 27 to 42.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Arrowrock Reservoir Temperature Statistics

October Temperature

Boise Air Terminal (19.3 miles)

  • Lowest 4 October, 2025

    48.9 °F

  • Average October

    59.7 °F

  • Highest 1 October, 2025

    73 °F

Climate (2020–Present)

Boise Air Terminal (19.3 miles)

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  • Average Low 2020–2025

    43.8 °F

  • Average 2020–2025

    54.5 °F

  • Average High 2020–2025

    65.8 °F
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