Half Moon Bay State Beach Weather Forecast

    • 58
    • 74

    Partly Sunny

    • 57
    • 74

    Mostly Cloudy

    • 58
    • 67

    Slight Chance Rain Showers

    • 58
    • 68

    Mostly Cloudy

    • 57
    • 69

    Mostly Cloudy

    • 58
    • 71

    Partly Sunny

Today 16 Sep San Francisco Peninsula Coast

Sunny. Highs in the mid 70s. Southwest Winds around 5 Mph.

Tonight 16 Sep San Francisco Peninsula Coast

Partly cloudy. Lows in the upper 50s. Northwest Winds around 5 Mph in the evening. Becoming light.

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Half Moon Bay State Beach Temperature Statistics

September Temperature

Half Moon Bay Airport (4.3 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    62 °F

  • Highest 8 September, 2025

    71.6 °F

Climate (2020–Present)

Half Moon Bay Airport (4.3 miles)

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  • Average Low 2020–2025

    47.9 °F

  • Average 2020–2025

    54.5 °F

  • Average High 2020–2025

    60.4 °F
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