San Mateo Weather Forecast

    • 61
    • 86

    Increasing Clouds

    • 62
    • 77

    Chance Rain Showers

    • 60
    • 79

    Chance Rain Showers

    • 59
    • 80

    Mostly Sunny

    • 60
    • 81

    Mostly Sunny

    • 62
    • 87

    Partly Sunny

    • 61
    • 80

    Chance Rain Showers

Today 17 Sep San Francisco Bay Shoreline

Sunny. Highs in the 70s to upper 80s. Northwest Winds 5 to 15 Mph.

Tonight 17 Sep San Francisco Bay Shoreline

Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower 60s. West Winds 10 to 15 Mph decreasing to around 5 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

San Mateo Temperature Statistics

September Temperature

San Francisco, San Francisco International Airport (4.3 miles)

  • Lowest 1 September, 2025

    57 °F

  • Average September

    65.5 °F

  • Highest 15 September, 2025

    82 °F

Climate (2020–Present)

San Francisco, San Francisco International Airport (4.3 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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