Rockville Hills Regional Park Weather Forecast

    • 62
    • 81

    Slight Chance Rain Showers

    • 60
    • 78

    Slight Chance Rain Showers

    • 60
    • 82

    Sunny

    • 61
    • 86

    Sunny

    • 63
    • 92

    Mostly Sunny

    • 60
    • 80

    Chance Rain Showers

Today 18 Sep Carquinez Strait and Delta

Mostly cloudy. Highs 82 to 88. Southwest Winds 10 to 15 Mph.

Tonight 18 Sep Carquinez Strait and Delta

Mostly cloudy with a slight chance of rain Showers. Lows 61 to 67. Southwest Winds up to 10 Mph with Gusts to around 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rockville Hills Regional Park Temperature Statistics

September Temperature

Napa, Napa County Airport (7.5 miles)

  • Lowest 14 September, 2025

    48 °F

  • Average September

    66.1 °F

  • Highest 15 September, 2025

    91 °F

Climate (2020–Present)

Napa, Napa County Airport (7.5 miles)

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  • Average Low 2020–2025

    46.9 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    70.5 °F
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