Williams Reservoir Weather Forecast

    • 51
    • 82

    Slight Chance Thunderstorms

    • 53
    • 77

    Mostly Sunny

    • 55
    • 86

    Mostly Sunny

    • 48
    • 76

    Chance Rain Showers

    • 43
    • 66

    Chance Rain Showers

    • 44
    • 62

    Chance Rain Showers

    • 45
    • 66

    Chance Rain Showers

Today 29 May Southern Twin Falls County

Partly cloudy. A slight chance of Showers and Thunderstorms this afternoon. Thunderstorms may produce gusty Winds this afternoon. Chance of rain 20 percent. Highs 85 to 90. Breezy.

Tonight 29 May Southern Twin Falls County

Partly cloudy with a slight chance of Showers and Thunderstorms this Evening, then mostly clear after midnight. Chance of rain 20 percent. Lows 53 to 58.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Williams Reservoir Temperature Statistics

May Temperature

Joslin Field - Magic Valley Regional Airport (14.3 miles)

  • Lowest 19 May, 2025

    35.7 °F

  • Average May

    58.2 °F

  • Highest 10 May, 2025

    90.6 °F

Climate (2020–Present)

Joslin Field - Magic Valley Regional Airport (14.3 miles)

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  • Average Low 2020–2025

    39.3 °F

  • Average 2020–2025

    50.8 °F

  • Average High 2020–2025

    62.5 °F
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