Lewisville Weather Forecast

    • 16
    • 34

    Mostly Sunny

    • 14
    • 33

    Partly Sunny

    • 15
    • 34

    Partly Sunny

    • 17
    • 35

    Mostly Cloudy

    • 17
    • 36

    Mostly Cloudy

Today 19 Jan Upper Snake River Plain

Sunny. Patchy freezing fog. Highs 31 to 38. Northeast Winds up to 10 Mph. Shifting to south in the afternoon.

Tonight 19 Jan Upper Snake River Plain

Mostly clear. Patchy freezing fog through the night. Lows 13 to 20. South Winds up to 10 Mph.

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Lewisville Temperature Statistics

January Temperature

Idaho Falls Regional Airport (12.4 miles)

  • Lowest 17 January, 2026

    16 °F

  • Average January

    30.3 °F

  • Highest 3 January, 2026

    48 °F

Climate (2021–Present)

Idaho Falls Regional Airport (12.4 miles)

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  • Average Low 2021–2026

    33.6 °F

  • Average 2021–2026

    46.5 °F

  • Average High 2021–2026

    59.3 °F
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