Lewisville Weather Forecast

    • 21
    • 47

    Mostly Sunny

    • 30
    • 44

    Mostly Cloudy

    • 36
    • 49

    Rain Likely

    • 23
    • 49

    Chance Rain/Snow

    • 32
    • 39

    Chance Rain/Snow

Today 14 Dec Upper Snake River Plain

Sunny. Highs 43 to 50. Northeast Winds up to 10 Mph in the morning. Becoming light and variable.

Tonight 14 Dec Upper Snake River Plain

Mostly clear. Lows 19 to 29. Northeast Winds up to 10 Mph.

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Lewisville Temperature Statistics

December Temperature

Idaho Falls Regional Airport (12.4 miles)

  • Lowest 3 December, 2025

    9 °F

  • Average December

    36 °F

  • Highest 11 December, 2025

    54 °F

Climate (2020–Present)

Idaho Falls Regional Airport (12.4 miles)

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  • Average Low 2020–2025

    33.4 °F

  • Average 2020–2025

    46.3 °F

  • Average High 2020–2025

    59.1 °F
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