Lewisville Weather Forecast

    • 43
    • 72

    Decreasing Clouds

    • 46
    • 74

    Partly Sunny

    • 40
    • 65

    Chance Rain Showers

    • 40
    • 70

    Mostly Sunny

    • 42
    • 75

    Sunny

    • 46
    • 77

    Mostly Sunny

    • 46
    • 76

    Partly Sunny

Today 13 Sep Upper Snake River Plain

Mostly sunny. A slight chance of rain Showers in the afternoon. Highs 68 to 75. Southeast Winds up to 10 Mph shifting to southwest around 10 Mph in the afternoon.

Tonight 13 Sep Upper Snake River Plain

Mostly clear. Lows 42 to 49. South Winds up to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Lewisville Temperature Statistics

September Temperature

Idaho Falls Regional Airport (12.4 miles)

  • Lowest 8 September, 2025

    46 °F

  • Average September

    65.1 °F

  • Highest 3 September, 2025

    90 °F

Climate (2020–Present)

Idaho Falls Regional Airport (12.4 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    33 °F

  • Average 2020–2025

    46.1 °F

  • Average High 2020–2025

    59 °F
Get WillyWeather+ to remove ads