Big Twin Lake Weather Forecast

    • 62
    • 92

    Mostly Sunny

    • 58
    • 79

    Partly Sunny

    • 58
    • 72

    Patchy Fog

    • 57
    • 66

    Mostly Sunny

    • 57
    • 68

    Breezy

    • 56
    • 66

    Partly Sunny

Today 9 Sep San Luis Obispo County Beaches

Partly cloudy in the morning then sunny. Highs from the mid to upper 80s at the Beaches to the mid to upper 90s inland. Northwest Winds around 15 Mph in the afternoon.

Tonight 9 Sep San Luis Obispo County Beaches

Mostly clear. Lows in the upper 50s to mid 60s. Northwest Winds around 15 Mph in the evening.

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Big Twin Lake Temperature Statistics

September Temperature

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

  • Lowest 7 September, 2026

    50 °F

  • Average September

    66.9 °F

  • Highest 6 September, 2026

    84.7 °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

    61.1 °F

  • Average High 2021–2026

    73.3 °F
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