Los Osos Weather Forecast

    • 58
    • 71

    Becoming Sunny

    • 58
    • 71

    Partly Sunny

    • 58
    • 71

    Patchy Fog

    • 59
    • 72

    Mostly Cloudy

    • 58
    • 73

    Slight Chance Thunderstorms

    • 56
    • 65

    Slight Chance Thunderstorms

Today 14 Sep San Luis Obispo County Beaches

Areas of low Clouds and fog in the morning then sunny. Highs from the lower to mid 70s at the Beaches to around 80 inland. Northwest Winds 15 to 25 Mph in the afternoon.

Tonight 14 Sep San Luis Obispo County Beaches

Clear except for patchy low Clouds and fog after midnight. Lows in the mid 50s to around 60. Northwest Winds around 15 Mph in the evening.

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Los Osos Temperature Statistics

September Temperature

San Luis Obispo, San Luis Obispo County-Mc Chesney Field (12.4 miles)

  • Lowest 7 September, 2025

    50 °F

  • Average September

    66.6 °F

  • Highest 1 September, 2025

    87.1 °F

Climate (2020–Present)

San Luis Obispo, San Luis Obispo County-Mc Chesney Field (12.4 miles)

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  • Average Low 2020–2025

    49.9 °F

  • Average 2020–2025

    60.4 °F

  • Average High 2020–2025

    72.9 °F
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