Half Moon Bay Weather Forecast

    • 54
    • 63

    Cloudy

    • 54
    • 64

    Mostly Cloudy

    • 53
    • 65

    Patchy Fog

    • 55
    • 73

    Partly Sunny

    • 56
    • 76

    Partly Sunny

    • 54
    • 71

    Partly Sunny

Today 20 Sep San Francisco Peninsula Coast

Mostly cloudy. Highs in the mid 60s. West Winds 5 to 10 Mph.

Tonight 20 Sep San Francisco Peninsula Coast

Mostly cloudy. Lows in the mid 50s. West Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Half Moon Bay Temperature Statistics

September Temperature

Half Moon Bay Airport (5 miles)

  • Lowest 8 September, 2026

    50 °F

  • Average September

    62 °F

  • Highest 9 September, 2026

    89.6 °F

Climate (2021–2026)

Half Moon Bay Airport (5 miles)

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  • Average Low 2021–2026

    48.8 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    61.1 °F
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