Bethany Reservoir Weather Forecast

    • 40
    • 52

    Partly Sunny

    • 45
    • 57

    Partly Sunny

    • 46
    • 60

    Partly Sunny

    • 47
    • 60

    Partly Sunny

    • 48
    • 62

    Mostly Cloudy

    • 49
    • 63

    Partly Sunny

    • 48
    • 63

    Partly Sunny

Today 5 Dec East Bay Interior Valleys

Partly cloudy late in the morning then becoming sunny. Highs in the mid 50s to lower 60s. Northeast Winds around 5 Mph.

Tonight 5 Dec East Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Lows in the lower 40s. Northeast Winds around 5 Mph.

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Bethany Reservoir Temperature Statistics

December Temperature

Livermore, Livermore Municipal Airport (12.4 miles)

  • Lowest 1 December, 2025

    39 °F

  • Average December

    47.4 °F

  • Highest 2 December, 2025

    63 °F

Climate (2020–Present)

Livermore, Livermore Municipal Airport (12.4 miles)

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  • Average Low 2020–2025

    48.8 °F

  • Average 2020–2025

    60.6 °F

  • Average High 2020–2025

    74 °F
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