Mount Heinen Weather Forecast

    • 58
    • 75

    Mostly Sunny

    • 61
    • 83

    Mostly Sunny

    • 43
    • 73

    Partly Sunny

    • 46
    • 58

    Partly Sunny

    • 45
    • 63

    Partly Sunny

    • 42
    • 60

    Mostly Sunny

Today 23 Sep Boise Mountains

Areas of fog this morning. Sunny. Highs 68 to 83.

Tonight 23 Sep Boise Mountains

Mostly clear. Lows 41 to 56.

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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

    65.9 °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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