Idaho City Weather Forecast

    • 42
    • 78

    Mostly Sunny

    • 38
    • 77

    Chance Thunderstorms

    • 37
    • 70

    Mostly Sunny

    • 40
    • 78

    Sunny

    • 42
    • 83

    Mostly Sunny

    • 42
    • 81

    Mostly Sunny

Today 13 Sep Boise Mountains

Sunny. Areas of fog this morning. A slight chance of rain Showers this afternoon. Chance of rain 20 percent. Highs 65 to 79.

Tonight 13 Sep Boise Mountains

Mostly clear. Patchy fog in the evening. Areas of fog after midnight. Lows 38 to 53.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Idaho City Temperature Statistics

September Temperature

Boise Air Terminal (26.7 miles)

  • Lowest 11 September, 2025

    55.9 °F

  • Average September

    75.5 °F

  • Highest 1 September, 2025

    100 °F

Climate (2020–Present)

Boise Air Terminal (26.7 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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