Rainbow Lake Weather Forecast

    • 43
    • 74

    Mostly Sunny

    • 52
    • 81

    Rain Likely

    • 50
    • 78

    Rain Showers

    • 45
    • 73

    Slight Chance Rain

    • 43
    • 72

    Mostly Sunny

    • 42
    • 74

    Mostly Sunny

    • 45
    • 78

    Mostly Sunny

Today 15 Sep Upper Snake River Plain

Sunny. Highs 72 to 79.

Tonight 15 Sep Upper Snake River Plain

Mostly clear. Lows 40 to 49. South Winds up to 10 Mph. Shifting to northeast around 10 Mph after midnight.

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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 8 September, 2026

    36.6 °F

  • Average September

    63 °F

  • Highest 6 September, 2026

    84.7 °F

Climate (2021–2026)

Rexburg, Rexburg-Madison County Airport (2.5 miles)

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  • Average Low 2021–2026

    34.4 °F

  • Average 2021–2026

    46.5 °F

  • Average High 2021–2026

    58.6 °F
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