San Francisco Bay - Red Rock Island Weather Forecast

    • 61
    • 63

    Chance Rain Showers

    • 60
    • 65

    Slight Chance Rain Showers

    • 60
    • 67

    Mostly Sunny

    • 60
    • 68

    Mostly Sunny

    • 61
    • 74

    Mostly Sunny

    • 62
    • 68

    Slight Chance Rain Showers

    • 60
    • 66

    Partly Sunny

Today 18 Sep San Francisco Bay Shoreline

Mostly cloudy. A slight chance of Showers and isolated Thunderstorms. Highs in the mid 70s to lower 80s. West Winds 5 to 15 Mph.

Tonight 18 Sep San Francisco Bay Shoreline

Mostly cloudy. Isolated Thunderstorms in the evening. A chance of Showers. Lows in the mid 60s. West Winds 10 to 15 Mph. Becoming northwest around 5 Mph after midnight.

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San Francisco Bay - Red Rock Island Temperature Statistics

September Temperature

Novato / Gnoss Field (16.2 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    66.1 °F

  • Highest 15 September, 2025

    96.8 °F

Climate (2020–Present)

Novato / Gnoss Field (16.2 miles)

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    57.5 °F

  • Average High 2020–2025

    72.6 °F
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