Idaho Falls Weather Forecast

    • 43
    • 68

    Chance Rain Showers

    • 44
    • 71

    Mostly Sunny

    • 44
    • 75

    Sunny

    • 46
    • 78

    Mostly Sunny

    • 48
    • 80

    Partly Sunny

    • 50
    • 79

    Partly Sunny

Today 15 Sep Upper Snake River Plain

Mostly sunny. A slight chance of Showers and Thunderstorms in the morning. Then a chance of rain Showers and a slight chance of Thunderstorms in the afternoon. Highs 63 to 70. Southwest Winds 10 to 15 Mph.

Tonight 15 Sep Upper Snake River Plain

Partly cloudy. Lows 39 to 46. North Winds around 10 Mph.

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Idaho Falls Temperature Statistics

September Temperature

Idaho Falls Regional Airport (2.5 miles)

  • Lowest 12 September, 2025

    43 °F

  • Average September

    64.6 °F

  • Highest 3 September, 2025

    90 °F

Climate (2020–Present)

Idaho Falls Regional Airport (2.5 miles)

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  • Average Low 2020–2025

    33.1 °F

  • Average 2020–2025

    46.1 °F

  • Average High 2020–2025

    58.9 °F
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