San Francisco Bay - Greco Island Weather Forecast

    • 58
    • 62

    Decreasing Clouds

    • 57
    • 64

    Partly Sunny

    • 57
    • 65

    Partly Sunny

    • 60
    • 77

    Partly Sunny

    • 60
    • 81

    Mostly Sunny

    • 58
    • 76

    Partly Sunny

Today 20 Sep San Francisco Bay Shoreline

Mostly cloudy. Highs in the upper 60s to mid 70s. West Winds 5 to 15 Mph.

Tonight 20 Sep San Francisco Bay Shoreline

Mostly cloudy. Lows in the upper 50s. West Winds 5 to 15 Mph.

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San Francisco Bay - Greco Island Temperature Statistics

September Temperature

San Carlos Airport (3.7 miles)

  • Lowest 7 September, 2026

    53.6 °F

  • Average September

    65.2 °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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