Los Osos Weather Forecast

    • 48
    • 66

    Dense Fog

    • 48
    • 61

    Patchy Fog

    • 49
    • 61

    Mostly Cloudy

    • 49
    • 61

    Partly Sunny

    • 50
    • 59

    Partly Sunny

    • 49
    • 59

    Partly Sunny

Today 21 May San Luis Obispo County Beaches

Areas of low Clouds and fog. Fog locally dense with visibility one quarter mile or less. Highs from the lower to mid 60s at the Beaches to the lower 70s inland.

Tonight 21 May San Luis Obispo County Beaches

Low Clouds and fog. Lows in the mid 40s to lower 50s.

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Los Osos Temperature Statistics

May Temperature

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

  • Lowest 18 May, 2026

    43 °F

  • Average May

    60.8 °F

  • Highest 19 May, 2026

    86 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    50.2 °F

  • Average 2021–2026

    60.8 °F

  • Average High 2021–2026

    73.2 °F
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