Lewisville Weather Forecast

    • 48
    • 81

    Chance Thunderstorms

    • 51
    • 79

    Chance Rain Showers

    • 48
    • 75

    Chance Rain Showers

    • 48
    • 75

    Chance Rain Showers

    • 46
    • 71

    Chance Rain Showers

    • 43
    • 66

    Chance Rain Showers

Today 7 Sep Upper Snake River Plain

Mostly sunny. A slight chance of rain Showers in the morning. Then a chance of Showers and Thunderstorms in the afternoon. Highs 76 to 84. East Winds up to 10 Mph. Shifting to southwest in the afternoon. Chance of precipitation 50 percent.

Tonight 7 Sep Upper Snake River Plain

Mostly cloudy with a chance of rain Showers and a slight chance of Thunderstorms in the evening. Then partly cloudy after midnight. Lows 46 to 53. West Winds 10 to 15 Mph shifting to northeast after midnight. Chance of precipitation 40 percent.

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Lewisville Temperature Statistics

September Temperature

Idaho Falls Regional Airport (12.4 miles)

  • Lowest 4 September, 2025

    46.9 °F

  • Average September

    67.6 °F

  • Highest 3 September, 2025

    90 °F

Climate (2020–Present)

Idaho Falls Regional Airport (12.4 miles)

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  • Average Low 2020–2025

    33 °F

  • Average 2020–2025

    46 °F

  • Average High 2020–2025

    58.9 °F
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