San Francisco Bay - Treasure Island Weather Forecast

    • 58
    • 66

    Decreasing Clouds

    • 57
    • 69

    Partly Sunny

    • 60
    • 78

    Partly Sunny

    • 61
    • 68

    Partly Sunny

    • 59
    • 65

    Partly Sunny

    • 58
    • 64

    Partly Sunny

Today 21 Sep San Francisco

Mostly cloudy. Highs in the 60s. Southwest Winds 5 to 15 Mph.

Tonight 21 Sep San Francisco

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

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San Francisco Bay - Treasure Island Temperature Statistics

September Temperature

Oakland, Metro Oakland International Airport (10.6 miles)

  • Lowest 14 September, 2026

    52.6 °F

  • Average September

    66.7 °F

  • Highest 9 September, 2026

    96.7 °F

Climate (2021–2026)

Oakland, Metro Oakland International Airport (10.6 miles)

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  • Average Low 2021–2026

    51.1 °F

  • Average 2021–2026

    58.9 °F

  • Average High 2021–2026

    67.2 °F
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