First Slough Weather Forecast

    • 55
    • 71

    Chance Rain Showers

    • 55
    • 73

    Chance Rain Showers

    • 52
    • 71

    Chance Rain Showers

    • 50
    • 75

    Mostly Sunny

    • 52
    • 77

    Partly Sunny

    • 54
    • 79

    Partly Sunny

Today 20 Oct San Francisco Bay Shoreline

Mostly cloudy. Highs around 70. Southeast Winds up to 5 Mph. Becoming northwest in the afternoon.

Tonight 20 Oct San Francisco Bay Shoreline

Mostly cloudy. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Lows in the mid 50s. Northwest Winds 5 to 10 Mph in the evening. Becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

First Slough Temperature Statistics

October Temperature

San Carlos Airport (2.5 miles)

  • Lowest 11 October, 2026

    48.2 °F

  • Average October

    62.5 °F

  • Highest 6 October, 2026

    89.6 °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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