Lewisville Weather Forecast

    • 41
    • 77

    Mostly Sunny

    • 52
    • 81

    Mostly Sunny

    • 47
    • 79

    Breezy

    • 45
    • 80

    Mostly Cloudy

    • 36
    • 61

    Slight Chance Rain

    • 36
    • 64

    Mostly Sunny

Today 9 Sep Upper Snake River Plain

Sunny. Highs 71 to 79. East Winds up to 10 Mph. Shifting to southwest in the afternoon.

Tonight 9 Sep Upper Snake River Plain

Mostly clear. Lows 39 to 48. South Winds 10 to 15 Mph.

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Lewisville Temperature Statistics

September Temperature

Idaho Falls Regional Airport (12.4 miles)

  • Lowest 3 September, 2026

    46.7 °F

  • Average September

    64.8 °F

  • Highest 6 September, 2026

    84.9 °F

Climate (2021–2026)

Idaho Falls Regional Airport (12.4 miles)

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  • Average Low 2021–2026

    33.8 °F

  • Average 2021–2026

    46.9 °F

  • Average High 2021–2026

    60 °F
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