Mount Heinen Weather Forecast

    • 53
    • 69

    Increasing Clouds

    • 50
    • 70

    Mostly Cloudy

    • 48
    • 58

    Rain Showers Likely

    • 52
    • 69

    Partly Sunny

    • 57
    • 73

    Mostly Cloudy

    • 57
    • 75

    Partly Sunny

Today 5 Sep Boise Mountains

Areas of fog this morning. Mostly sunny. Warmer with Highs 63 to 78.

Tonight 5 Sep Boise Mountains

Partly cloudy in the Evening, then mostly cloudy with a chance of rain Showers after midnight. Areas of fog after midnight. Chance of rain 30 percent. Lows 34 to 49.

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  • Temperature Forecast NOAA

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Mount Heinen Temperature Statistics

September Temperature

Boise Air Terminal (19.3 miles)

  • Lowest 2 September, 2026

    61 °F

  • Average September

    72.3 °F

  • Highest 1 September, 2026

    86.6 °F

Climate (2021–2026)

Boise Air Terminal (19.3 miles)

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  • Average Low 2021–2026

    44.1 °F

  • Average 2021–2026

    55 °F

  • Average High 2021–2026

    66.3 °F
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