San Pablo Bay - Rat Rock Weather Forecast

    • 61
    • 69

    Chance Rain Showers

    • 60
    • 70

    Slight Chance Rain Showers

    • 60
    • 72

    Mostly Sunny

    • 60
    • 74

    Sunny

    • 61
    • 80

    Mostly Sunny

    • 62
    • 74

    Slight Chance Rain Showers

Today 18 Sep North Bay Interior Valleys

Mostly cloudy late in the morning then becoming partly cloudy. A slight chance of Showers. Isolated Thunderstorms in the afternoon. Highs in the lower 70s to mid 80s. South Winds 5 to 15 Mph.

Tonight 18 Sep North Bay Interior Valleys

Mostly cloudy. Isolated Thunderstorms in the evening. A chance of Showers. Patchy fog after midnight. Lows in the mid 50s to lower 60s. Southwest Winds 5 to 10 Mph.

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San Pablo Bay - Rat Rock Temperature Statistics

September Temperature

Novato / Gnoss Field (10.6 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 (10.6 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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