Ammon Weather Forecast

    • 43
    • 68

    Slight Chance Thunderstorms

    • 45
    • 71

    Mostly Sunny

    • 47
    • 75

    Sunny

    • 49
    • 79

    Mostly Sunny

    • 51
    • 79

    Partly Sunny

    • 51
    • 77

    Slight Chance Rain Showers

Today 15 Sep Upper Snake River Plain

Mostly sunny. A slight chance of rain Showers in the morning. Then a slight chance of Showers and Thunderstorms in the afternoon. Highs 63 to 71. Southwest Winds 10 to 15 Mph. Chance of precipitation 20 percent.

Tonight 15 Sep Upper Snake River Plain

Partly cloudy. Lows 39 to 46. Northwest Winds 10 to 15 Mph. Shifting to northeast after midnight.

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Ammon Temperature Statistics

September Temperature

Idaho Falls Regional Airport (5.6 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 (5.6 miles)

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  • Average Low 2020–2025

    33 °F

  • Average 2020–2025

    46.1 °F

  • Average High 2020–2025

    58.9 °F
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