Rainbow Lake Weather Forecast

    • 41
    • 70

    Isolated Thunderstorms

    • 43
    • 74

    Sunny

    • 44
    • 76

    Mostly Sunny

    • 48
    • 79

    Partly Sunny

    • 46
    • 75

    Partly Sunny

    • 46
    • 74

    Mostly Sunny

Today 16 Sep Upper Snake River Plain

Mostly sunny. Isolated rain Showers in the morning. Then isolated Showers and Thunderstorms in the afternoon. Highs 65 to 73. Northeast Winds 10 to 15 Mph.

Tonight 16 Sep Upper Snake River Plain

Mostly clear. Lows 40 to 47. Northeast Winds 10 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rainbow Lake Temperature Statistics

September Temperature

Rexburg, Rexburg-Madison County Airport (2.5 miles)

  • Lowest 12 September, 2025

    43 °F

  • Average September

    64.5 °F

  • Highest 2 September, 2025

    90 °F

Climate (2020–Present)

Rexburg, Rexburg-Madison County Airport (2.5 miles)

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  • Average Low 2020–2025

    33.5 °F

  • Average 2020–2025

    45.5 °F

  • Average High 2020–2025

    57.6 °F
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