Chesterfield Reservoir Weather Forecast

    • 41
    • 71

    Slight Chance Thunderstorms

    • 44
    • 73

    Chance Rain Showers

    • 39
    • 66

    Chance Thunderstorms

    • 41
    • 70

    Sunny

    • 44
    • 76

    Sunny

    • 47
    • 77

    Mostly Sunny

Today 13 Sep Blackfoot Mountains

Mostly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Highs 64 to 73.

Tonight 13 Sep Blackfoot Mountains

Mostly clear. Lows 39 to 49.

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Chesterfield Reservoir Temperature Statistics

September Temperature

Pocatello, Pocatello Regional Airport (30.4 miles)

  • Lowest 8 September, 2025

    44.1 °F

  • Average September

    67.2 °F

  • Highest 2 September, 2025

    93 °F

Climate (2020–Present)

Pocatello, Pocatello Regional Airport (30.4 miles)

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  • Average Low 2020–2025

    34.8 °F

  • Average 2020–2025

    48.2 °F

  • Average High 2020–2025

    61.2 °F
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