Old Rock Tank Weather Forecast

    • 56
    • 66

    Rain Showers Likely

    • 56
    • 72

    Chance Thunderstorms

    • 45
    • 81

    Mostly Sunny

    • 50
    • 71

    Mostly Sunny

    • 56
    • 83

    Mostly Sunny

    • 58
    • 84

    Mostly Sunny

    • 59
    • 84

    Mostly Sunny

Today 16 Dec McMullen

Cloudy. Highs in the mid 60s. East Winds 5 to 10 Mph.

Tonight 16 Dec McMullen

Mostly cloudy with a chance of Showers. A slight chance of Thunderstorms in the Evening, then a chance of Thunderstorms after midnight. Patchy fog after midnight. Not as cool with Lows in the mid 50s. Northeast Winds around 5 Mph. Chance of rain 50 percent.

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Old Rock Tank Temperature Statistics

December Temperature

Pleasanton Municipal Airport (28.6 miles)

  • Lowest 9 December, 2025

    31.5 °F

  • Average December

    54.6 °F

  • Highest 7 December, 2025

    81.9 °F

Climate (2020–Present)

Pleasanton Municipal Airport (28.6 miles)

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  • Average Low 2020–2025

    60.9 °F

  • Average 2020–2025

    72 °F

  • Average High 2020–2025

    84.5 °F
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