Foster City Weather Forecast

    • 66
    • 94

    Increasing Clouds

    • 61
    • 85

    Partly Sunny

    • 59
    • 78

    Mostly Sunny

    • 57
    • 73

    Mostly Sunny

    • 57
    • 77

    Mostly Sunny

    • 57
    • 77

    Mostly Sunny

    • 57
    • 73

    Partly Sunny

Today 9 Sep San Francisco Bay Shoreline

Partly cloudy late in the morning then becoming sunny. Highs in the upper 80s to mid 90s. Light Winds. Becoming northwest 10 to 20 Mph in the afternoon.

Tonight 9 Sep San Francisco Bay Shoreline

Mostly clear in the evening then becoming partly cloudy. Lows in the mid 60s to lower 70s. West Winds 10 to 15 Mph. Becoming southwest up to 5 Mph after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Foster City Temperature Statistics

September Temperature

San Carlos Airport (3.1 miles)

  • Lowest 7 September, 2026

    53.6 °F

  • Average September

    63.5 °F

  • Highest 7 September, 2026

    84.2 °F

Climate (2021–2026)

San Carlos Airport (3.1 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    51.8 °F

  • Average 2021–2026

    57 °F

  • Average High 2021–2026

    68.3 °F
Get WillyWeather+ to remove ads