Half Moon Bay Weather Forecast

    • 56
    • 66

    Increasing Clouds

    • 58
    • 70

    Mostly Cloudy

    • 58
    • 68

    Slight Chance Rain

    • 56
    • 67

    Slight Chance Rain

    • 56
    • 66

    Mostly Cloudy

    • 55
    • 67

    Mostly Cloudy

Today 6 Sep San Francisco Peninsula Coast

Mostly cloudy in the morning then becoming partly cloudy. A slight chance of drizzle in the morning. Highs in the upper 60s. West Winds around 5 Mph.

Tonight 6 Sep San Francisco Peninsula Coast

Mostly cloudy. A slight chance of drizzle. Patchy fog after midnight. Lows in the upper 50s. West Winds around 5 Mph in the evening. Becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Half Moon Bay Temperature Statistics

September Temperature

Half Moon Bay Airport (5 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    59.8 °F

  • Highest 2 September, 2025

    66.2 °F

Climate (2020–Present)

Half Moon Bay Airport (5 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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