Upper Arcadia Reservoir Weather Forecast

    • 50
    • 77

    Patchy Smoke

    • 37
    • 74

    Breezy

    • 38
    • 65

    Sunny

    • 40
    • 71

    Mostly Sunny

    • 42
    • 73

    Mostly Sunny

    • 42
    • 74

    Mostly Sunny

    • 43
    • 73

    Slight Chance Thunderstorms

Today 12 Sep Upper Snake River Plain

Mostly sunny. Highs 75 to 83. Northeast Winds up to 10 Mph. Shifting to southwest in the afternoon.

Tonight 12 Sep Upper Snake River Plain

Mostly cloudy in the evening then clearing. Patchy smoke. Lows 47 to 57. South Winds around 10 Mph. Shifting to east after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Upper Arcadia Reservoir Temperature Statistics

September Temperature

Rexburg, Rexburg-Madison County Airport (23.6 miles)

  • Lowest 8 September, 2026

    36.6 °F

  • Average September

    62.6 °F

  • Highest 6 September, 2026

    84.7 °F

Climate (2021–2026)

Rexburg, Rexburg-Madison County Airport (23.6 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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