Santa Margarita Lake Weather Forecast

    • 33
    • 66

    Sunny

    • 37
    • 68

    Sunny

    • 37
    • 69

    Sunny

    • 40
    • 70

    Sunny

    • 42
    • 71

    Partly Sunny

    • 45
    • 75

    Mostly Sunny

Today 5 Dec San Luis Obispo County Mountains

Sunny. Highs from the mid 60s to around 70 at low Elevations to the mid 50s to around 60 at high Elevations. Northeast Winds around 15 Mph in the morning.

Tonight 5 Dec San Luis Obispo County Mountains

Clear. Lows in the 40s to around 50 except the mid to upper 30s Colder Valleys and Slopes. Northeast Winds around 15 Mph.

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Santa Margarita Lake Temperature Statistics

December Temperature

San Luis Obispo, San Luis Obispo County-Mc Chesney Field (11.2 miles)

  • Lowest 2 December, 2025

    39.9 °F

  • Average December

    51.4 °F

  • Highest 2 December, 2025

    69.1 °F

Climate (2020–Present)

San Luis Obispo, San Luis Obispo County-Mc Chesney Field (11.2 miles)

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  • Average Low 2020–2025

    49.9 °F

  • Average 2020–2025

    60.3 °F

  • Average High 2020–2025

    72.8 °F
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