St. Francis Weather Forecast

    • 57
    • 71

    Decreasing Clouds

    • 58
    • 75

    Mostly Sunny

    • 57
    • 75

    Mostly Sunny

    • 57
    • 72

    Partly Sunny

    • 58
    • 70

    Partly Sunny

    • 58
    • 70

    Partly Sunny

Today 14 Sep San Francisco Peninsula Coast

Mostly cloudy in the morning then becoming partly cloudy. A slight chance of drizzle in the morning. Highs in the lower 70s. Northwest Winds 5 to 15 Mph.

Tonight 14 Sep San Francisco Peninsula Coast

Mostly cloudy. Lows in the upper 50s. West Winds 5 to 10 Mph.

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St. Francis Temperature Statistics

September Temperature

San Francisco, San Francisco International Airport (6.8 miles)

  • Lowest 1 September, 2025

    57 °F

  • Average September

    65.5 °F

  • Highest 8 September, 2025

    77 °F

Climate (2020–Present)

San Francisco, San Francisco International Airport (6.8 miles)

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  • Average Low 2020–2025

    52.3 °F

  • Average 2020–2025

    58.3 °F

  • Average High 2020–2025

    66.7 °F
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