First Slough Weather Forecast

    • 57
    • 74

    Mostly Sunny

    • 57
    • 76

    Mostly Sunny

    • 57
    • 74

    Mostly Sunny

    • 60
    • 83

    Mostly Sunny

    • 61
    • 82

    Partly Sunny

    • 63
    • 79

    Partly Sunny

    • 62
    • 80

    Partly Sunny

Today 4 Sep San Francisco Bay Shoreline

Sunny. Highs in the upper 60s to mid 70s. West Winds 10 to 20 Mph.

Tonight 4 Sep San Francisco Bay Shoreline

Mostly clear. Lows in the upper 50s. West Winds 10 to 20 Mph. Becoming 5 to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

First Slough Temperature Statistics

September Temperature

San Carlos Airport (2.5 miles)

  • Lowest 1 September, 2026

    60.8 °F

  • Average September

    63.8 °F

  • Highest 2 September, 2026

    75.2 °F

Climate (2021–2026)

San Carlos Airport (2.5 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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