San Luis Obispo Weather Forecast

    • 55
    • 75

    Rain Showers Likely

    • 58
    • 73

    Chance Rain Showers

    • 58
    • 77

    Patchy Fog

    • 60
    • 80

    Partly Sunny

    • 62
    • 82

    Slight Chance Rain Showers

    • 59
    • 77

    Slight Chance Rain Showers

Today 18 Sep San Luis Obispo County Inland Central Coast

A chance of Showers with a slight chance of Thunderstorms in the morning then Showers likely with a slight chance of Thunderstorms in the afternoon. Highs in the lower to mid 70s. Chance of precipitation 70 percent.

Tonight 18 Sep San Luis Obispo County Inland Central Coast

Showers likely with a slight chance of Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the 50s. Chance of precipitation 70 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

San Luis Obispo Temperature Statistics

September Temperature

San Luis Obispo, San Luis Obispo County-Mc Chesney Field (3.1 miles)

  • Lowest 7 September, 2025

    50 °F

  • Average September

    65.9 °F

  • Highest 1 September, 2025

    87.1 °F

Climate (2020–Present)

San Luis Obispo, San Luis Obispo County-Mc Chesney Field (3.1 miles)

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

  • Average Low 2020–2025

    49.9 °F

  • Average 2020–2025

    60.4 °F

  • Average High 2020–2025

    73 °F
Get WillyWeather+ to remove ads