San Quentin Weather Forecast

    • 55
    • 78

    Increasing Clouds

    • 56
    • 81

    Partly Sunny

    • 57
    • 83

    Mostly Sunny

    • 58
    • 86

    Mostly Sunny

    • 57
    • 87

    Mostly Sunny

    • 56
    • 79

    Mostly Sunny

Today 5 Aug North Bay Interior Valleys

Mostly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the mid 70s to upper 80s. Southwest Winds 10 to 15 Mph.

Tonight 5 Aug North Bay Interior Valleys

Mostly clear in the evening then becoming mostly cloudy. Areas of fog after midnight. Lows in the 40s to upper 50s. Southwest Winds 5 to 15 Mph.

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San Quentin Temperature Statistics

August Temperature

Novato / Gnoss Field (14.3 miles)

  • Lowest 1 August, 2026

    53.6 °F

  • Average August

    70.6 °F

  • Highest 2 August, 2026

    98.6 °F

Climate (2021–2026)

Novato / Gnoss Field (14.3 miles)

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  • Average Low 2021–2026

    46.9 °F

  • Average 2021–2026

    57.8 °F

  • Average High 2021–2026

    72.5 °F
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