Halcyon Weather Forecast

    • 40
    • 67

    Sunny

    • 43
    • 70

    Sunny

    • 44
    • 71

    Mostly Sunny

    • 52
    • 72

    Mostly Sunny

    • 53
    • 74

    Mostly Sunny

    • 55
    • 78

    Mostly Sunny

    • 54
    • 77

    Mostly Sunny

Today 5 Dec San Luis Obispo County Beaches

Sunny. Highs in the mid 60s to around 70. North Winds around 15 Mph.

Tonight 5 Dec San Luis Obispo County Beaches

Clear. Lows in the mid 30s to mid 40s except around 50 in the Hills. North Winds around 15 Mph after midnight.

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Halcyon Temperature Statistics

December Temperature

San Luis Obispo, San Luis Obispo County-Mc Chesney Field (9.3 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 (9.3 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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