Rockville Weather Forecast

    • 55
    • 57

    Rain

    • 52
    • 58

    Rain

    • 49
    • 53

    Rain

    • 46
    • 53

    Rain

    • 48
    • 51

    Rain

    • 44
    • 50

    Rain

Today 20 Dec Carquinez Strait and Delta

Cloudy. A chance of rain until late Afternoon, then rain likely late in the afternoon. Highs around 57. Southeast Winds around 10 Mph.

Tonight 20 Dec Carquinez Strait and Delta

A chance of rain in the Evening, then rain likely after midnight. Lows around 55. South Winds 10 to 15 Mph. Gusts up to 30 Mph after midnight.

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Rockville Temperature Statistics

December Temperature

Napa, Napa County Airport (8.7 miles)

  • Lowest 2 December, 2025

    37 °F

  • Average December

    45.5 °F

  • Highest 3 December, 2025

    66 °F

Climate (2020–Present)

Napa, Napa County Airport (8.7 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.1 °F
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