Arrowrock Reservoir Weather Forecast

    • 23
    • 35

    Becoming Sunny

    • 25
    • 39

    Partly Sunny

    • 26
    • 41

    Partly Sunny

    • 29
    • 41

    Partly Sunny

    • 29
    • 45

    Partly Sunny

    • 28
    • 45

    Mostly Sunny

Today 9 Jan Boise Mountains

Mostly sunny. Areas of fog this morning. Patchy fog this afternoon. Highs 24 to 37.

Tonight 9 Jan Boise Mountains

Mostly clear. Areas of fog. Lows 9 to 24.

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Arrowrock Reservoir Temperature Statistics

January Temperature

Boise Air Terminal (19.3 miles)

  • Lowest 1 January, 2026

    28.9 °F

  • Average January

    41.5 °F

  • Highest 3 January, 2026

    57.9 °F

Climate (2021–Present)

Boise Air Terminal (19.3 miles)

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  • Average Low 2021–2026

    44.1 °F

  • Average 2021–2026

    54.8 °F

  • Average High 2021–2026

    66 °F
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