San Marin Weather Forecast

    • 52
    • 76

    Mostly Sunny

    • 52
    • 76

    Mostly Sunny

    • 57
    • 86

    Mostly Sunny

    • 60
    • 90

    Partly Sunny

    • 63
    • 91

    Partly Sunny

    • 60
    • 88

    Mostly Sunny

Today 5 Sep North Bay Interior Valleys

Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the upper 60s to lower 80s. West Winds up to 5 Mph increasing to southwest 10 to 20 Mph in the afternoon.

Tonight 5 Sep North Bay Interior Valleys

Mostly clear in the evening then becoming partly cloudy. Areas of fog after midnight. Lows in the 40s to mid 50s. West Winds 5 to 15 Mph.

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San Marin Temperature Statistics

September Temperature

Novato / Gnoss Field (2.5 miles)

  • Lowest 2 September, 2026

    57.2 °F

  • Average September

    64.7 °F

  • Highest 2 September, 2026

    77 °F

Climate (2021–2026)

Novato / Gnoss Field (2.5 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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