Half Moon Bay State Beach Weather Forecast

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    Rain

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    Rain

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    Rain

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    • 61

    Rain

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    • 61

    Rain

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    Rain

Today 19 Dec San Francisco Peninsula Coast

A slight chance of rain in the Morning, then rain in the afternoon. Highs in the lower 60s. South Winds 5 to 15 Mph.

Tonight 19 Dec San Francisco Peninsula Coast

Rain in the Evening, then rain likely after midnight. Patchy fog after midnight. Lows in the lower 50s. Southwest Winds 5 to 10 Mph.

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Half Moon Bay State Beach Temperature Statistics

December Temperature

Half Moon Bay Airport (4.3 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 (4.3 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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