San Gregorio State Beach Weather Forecast

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    Chance Rain

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    • 61

    Rain

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    • 60

    Rain

    • 53
    • 60

    Rain

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    • 59

    Rain

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    Rain

Today 18 Dec San Francisco Peninsula Coast

Mostly cloudy in the morning then becoming partly cloudy. Patchy fog in the morning. A slight chance of rain in the afternoon. Highs in the lower 60s. Light Winds. Becoming northwest around 5 Mph in the afternoon.

Tonight 18 Dec San Francisco Peninsula Coast

Mostly cloudy. A chance of rain. Lows in the lower 50s. Light Winds. Becoming southwest around 5 Mph after midnight.

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San Gregorio State Beach Temperature Statistics

December Temperature

Half Moon Bay Airport (14.3 miles)

  • Lowest 15 December, 2025

    39.2 °F

  • Average December

    53.1 °F

  • Highest 11 December, 2025

    71.6 °F

Climate (2020–Present)

Half Moon Bay Airport (14.3 miles)

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  • Average Low 2020–2025

    48 °F

  • Average 2020–2025

    54.5 °F

  • Average High 2020–2025

    60.4 °F
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