Mount Heinen Weather Forecast

    • 54
    • 71

    Mostly Sunny

    • 57
    • 76

    Mostly Sunny

    • 56
    • 76

    Partly Sunny

    • 55
    • 77

    Mostly Sunny

    • 59
    • 79

    Mostly Sunny

    • 54
    • 76

    Partly Sunny

Today 20 Sep Boise Mountains

Areas of fog this morning. Sunny. Highs 66 to 80.

Tonight 20 Sep Boise Mountains

Mostly clear. Lows 37 to 52.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Heinen Temperature Statistics

September Temperature

Boise Air Terminal (19.3 miles)

  • Lowest 3 September, 2026

    46.7 °F

  • Average September

    65.7 °F

  • Highest 12 September, 2026

    90.6 °F

Climate (2021–2026)

Boise Air Terminal (19.3 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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