Boise Weather Forecast

    • 50
    • 74

    Sunny

    • 55
    • 81

    Sunny

    • 56
    • 86

    Sunny

    • 58
    • 88

    Partly Sunny

    • 61
    • 88

    Partly Sunny

    • 60
    • 88

    Partly Sunny

Today 15 Sep Upper Treasure Valley

Areas of fog this morning. Sunny. Highs 71 to 76. Northwest Winds 10 to 15 Mph with Gusts to 25 Mph.

Tonight 15 Sep Upper Treasure Valley

Mostly clear. Lows 43 to 50. Northwest Winds 10 to 15 Mph. Gusts to 25 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Boise Temperature Statistics

September Temperature

Boise Air Terminal (3.1 miles)

  • Lowest 12 September, 2025

    55 °F

  • Average September

    74.2 °F

  • Highest 1 September, 2025

    100 °F

Climate (2020–Present)

Boise Air Terminal (3.1 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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