Arrowrock Reservoir Weather Forecast

    • 34
    • 54

    Chance Rain Showers

    • 32
    • 52

    Slight Chance Rain Showers

    • 33
    • 60

    Mostly Sunny

    • 36
    • 62

    Sunny

    • 37
    • 66

    Mostly Sunny

    • 41
    • 70

    Sunny

Today 11 Oct Boise Mountains

Areas of fog in the morning. Sunny. Highs 60 to 74.

Tonight 11 Oct Boise Mountains

Rain and snow Showers Likely, mainly this evening. Areas of fog. Chance of precipitation 60 percent. Little or no snow accumulation. Lows 25 to 39.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Arrowrock Reservoir Temperature Statistics

October Temperature

Boise Air Terminal (19.3 miles)

  • Lowest 1 October, 2026

    50.6 °F

  • Average October

    69.2 °F

  • Highest 4 October, 2026

    88.6 °F

Climate (2021–2026)

Boise Air Terminal (19.3 miles)

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  • Average Low 2021–2026

    44.2 °F

  • Average 2021–2026

    55 °F

  • Average High 2021–2026

    66.3 °F
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