Arrowrock Reservoir Weather Forecast

    • 60
    • 95

    Patchy Smoke

    • 57
    • 90

    Sunny

    • 57
    • 89

    Mostly Sunny

    • 62
    • 94

    Mostly Sunny

    • 66
    • 96

    Partly Sunny

    • 63
    • 92

    Partly Sunny

    • 61
    • 90

    Slight Chance Thunderstorms

Today 19 Aug Boise Mountains

Sunny. Highs 84 to 99.

Tonight 19 Aug Boise Mountains

Patchy smoke this evening. Mostly clear. Lows 47 to 62.

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  • Temperature Real-Time

Arrowrock Reservoir Temperature Statistics

August Temperature

Boise Air Terminal (19.3 miles)

  • Lowest 8 August, 2025

    51.7 °F

  • Average August

    77.2 °F

  • Highest 12 August, 2025

    102.7 °F

Climate (2020–Present)

Boise Air Terminal (19.3 miles)

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  • Average Low 2020–2025

    43.7 °F

  • Average 2020–2025

    54.4 °F

  • Average High 2020–2025

    65.7 °F
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