Downtown (South San Francisco) Weather Forecast

    • 57
    • 66

    Mostly Cloudy

    • 58
    • 67

    Mostly Cloudy

    • 57
    • 69

    Partly Sunny

    • 59
    • 79

    Partly Sunny

    • 60
    • 78

    Partly Sunny

    • 58
    • 72

    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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Downtown (South San Francisco) Temperature Statistics

September Temperature

San Francisco, San Francisco International Airport (3.1 miles)

  • Lowest 7 September, 2026

    56.6 °F

  • Average September

    67.8 °F

  • Highest 9 September, 2026

    94.6 °F

Climate (2021–2026)

San Francisco, San Francisco International Airport (3.1 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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