Half Moon Bay Airport Weather Forecast

    • 60
    • 66

    Chance Rain Showers

    • 60
    • 67

    Slight Chance Rain Showers

    • 58
    • 67

    Partly Sunny

    • 58
    • 66

    Partly Sunny

    • 60
    • 70

    Mostly Cloudy

    • 61
    • 70

    Slight Chance Rain Showers

Today 18 Sep San Francisco Peninsula Coast

Mostly cloudy. A slight chance of Showers in the Morning, then a chance of Showers and isolated Thunderstorms in the afternoon. Highs in the upper 60s. Southwest Winds 5 to 10 Mph.

Tonight 18 Sep San Francisco Peninsula Coast

Mostly cloudy. A chance of Showers and isolated Thunderstorms. Lows in the upper 50s. Southwest Winds around 5 Mph.

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Half Moon Bay Airport Temperature Statistics

September Temperature

Half Moon Bay Airport (0 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    61.8 °F

  • Highest 8 September, 2025

    71.6 °F

Climate (2020–Present)

Half Moon Bay Airport (0 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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