Santa Margarita Lake Weather Forecast

    • 56
    • 89

    Increasing Clouds

    • 63
    • 93

    Partly Sunny

    • 64
    • 101

    Hot

    • 62
    • 100

    Hot

    • 56
    • 93

    Mostly Sunny

    • 53
    • 88

    Mostly Sunny

Today 7 Sep San Luis Obispo County Mountains

Sunny. Highs from the mid 80s to around 90 at low Elevations to the lower to mid 80s at high Elevations. Southwest Winds around 15 Mph in the afternoon.

Tonight 7 Sep San Luis Obispo County Mountains

Mostly clear in the evening then partly cloudy. Lows in the upper 50s to mid 60s.

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Santa Margarita Lake Temperature Statistics

September Temperature

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

  • Lowest 2 September, 2026

    53.7 °F

  • Average September

    65.7 °F

  • Highest 4 September, 2026

    78.1 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    50.2 °F

  • Average 2021–2026

    61 °F

  • Average High 2021–2026

    73.3 °F
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