Northwest Boise City Weather Forecast

    • 46
    • 72

    Mostly Sunny

    • 50
    • 79

    Mostly Sunny

    • 52
    • 82

    Mostly Sunny

    • 52
    • 80

    Mostly Sunny

    • 50
    • 77

    Mostly Sunny

    • 51
    • 80

    Mostly Sunny

Today 14 Sep Upper Treasure Valley

Areas of fog this morning. Sunny. Highs 67 to 72. Northwest Winds 10 to 15 Mph.

Tonight 14 Sep Upper Treasure Valley

Mostly clear. Patchy fog after midnight. Lows 39 to 47. Northwest Winds 10 to 15 Mph in the Evening, shifting to east after midnight.

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Northwest Boise City Temperature Statistics

September Temperature

Boise Air Terminal (8.1 miles)

  • Lowest 3 September, 2026

    46.7 °F

  • Average September

    66 °F

  • Highest 12 September, 2026

    89.1 °F

Climate (2021–2026)

Boise Air Terminal (8.1 miles)

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  • Average Low 2021–2026

    44.1 °F

  • Average 2021–2026

    54.9 °F

  • Average High 2021–2026

    66.3 °F
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