Mariners Island Park Weather Forecast

    • 57
    • 71

    Increasing Clouds

    • 56
    • 73

    Partly Sunny

    • 59
    • 82

    Mostly Sunny

    • 60
    • 80

    Partly Sunny

    • 57
    • 77

    Mostly Sunny

    • 56
    • 76

    Mostly Sunny

    • 56
    • 74

    Mostly Sunny

Today 21 Sep San Francisco Bay Shoreline

Mostly cloudy late in the morning then becoming sunny. Highs in the upper 60s to mid 70s. Southwest Winds 5 to 10 Mph. Becoming west 10 to 20 Mph in the afternoon.

Tonight 21 Sep San Francisco Bay Shoreline

Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 50s. West Winds 10 to 20 Mph. Becoming southwest 5 to 10 Mph after midnight.

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Mariners Island Park Temperature Statistics

September Temperature

San Carlos Airport (3.7 miles)

  • Lowest 7 September, 2026

    53.6 °F

  • Average September

    65 °F

  • Highest 9 September, 2026

    98.6 °F

Climate (2021–2026)

San Carlos Airport (3.7 miles)

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  • Average Low 2021–2026

    51.8 °F

  • Average 2021–2026

    57 °F

  • Average High 2021–2026

    68.3 °F
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