Bel Marin Keys Weather Forecast

    • 51
    • 81

    Mostly Sunny

    • 52
    • 83

    Mostly Sunny

    • 52
    • 77

    Mostly Sunny

    • 54
    • 82

    Sunny

    • 53
    • 81

    Mostly Sunny

    • 52
    • 78

    Mostly Sunny

Today 31 May North Bay Interior Valleys

Sunny. Highs in the lower 70s to mid 80s. Southwest Winds 5 to 15 Mph.

Tonight 31 May North Bay Interior Valleys

Mostly clear. Lows in the 40s to upper 50s. West Winds 10 to 15 Mph decreasing to up to 5 Mph after midnight.

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Bel Marin Keys Temperature Statistics

May Temperature

Novato / Gnoss Field (4.3 miles)

  • Lowest 4 May, 2026

    46.4 °F

  • Average May

    61.7 °F

  • Highest 19 May, 2026

    89.6 °F

Climate (2021–Present)

Novato / Gnoss Field (4.3 miles)

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  • Average Low 2021–2026

    46.8 °F

  • Average 2021–2026

    57.7 °F

  • Average High 2021–2026

    72.5 °F
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