San Francisco Bay - Sierra Point Marina Weather Forecast

    • 57
    • 68

    Mostly Cloudy

    • 56
    • 70

    Partly Sunny

    • 59
    • 80

    Mostly Sunny

    • 61
    • 76

    Partly Sunny

    • 58
    • 73

    Mostly Sunny

    • 58
    • 71

    Partly Sunny

Today 21 Sep San Francisco Bay Shoreline

Mostly cloudy 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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San Francisco Bay - Sierra Point Marina Temperature Statistics

September Temperature

San Francisco, San Francisco International Airport (3.7 miles)

  • Lowest 7 September, 2026

    56.6 °F

  • Average September

    67.6 °F

  • Highest 9 September, 2026

    94.6 °F

Climate (2021–2026)

San Francisco, San Francisco International Airport (3.7 miles)

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  • Average Low 2021–2026

    52.5 °F

  • Average 2021–2026

    58.7 °F

  • Average High 2021–2026

    66.8 °F
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