Main Post Weather Forecast

    • 59
    • 66

    Increasing Clouds

    • 60
    • 62

    Chance Rain Showers

    • 60
    • 63

    Chance Rain Showers

    • 60
    • 64

    Partly Sunny

    • 60
    • 65

    Mostly Sunny

    • 61
    • 66

    Slight Chance Rain Showers

Today 17 Sep San Francisco

Partly cloudy. Areas of dense fog in the morning. Highs in the mid 60s to lower 80s. West Winds around 5 Mph increasing to 10 to 15 Mph in the afternoon.

Tonight 17 Sep San Francisco

Partly cloudy in the evening then becoming mostly cloudy. Lows around 60. Southwest Winds 5 to 15 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Main Post Temperature Statistics

September Temperature

San Francisco, San Francisco International Airport (13 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 (13 miles)

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

  • Average Low 2020–2025

    52.3 °F

  • Average 2020–2025

    58.3 °F

  • Average High 2020–2025

    66.7 °F
Get WillyWeather+ to remove ads