Half Moon Bay - Princeton Weather Forecast

    • 57
    • 74

    Partly Sunny

    • 56
    • 73

    Partly Sunny

    • 57
    • 70

    Mostly Cloudy

    • 58
    • 66

    Chance Rain Showers

    • 58
    • 69

    Slight Chance Rain Showers

    • 58
    • 68

    Patchy Fog

    • 57
    • 67

    Mostly Cloudy

Today 15 Sep San Francisco Peninsula Coast

Sunny. Highs in the upper 70s. Light Winds. Becoming west around 5 Mph in the afternoon.

Tonight 15 Sep San Francisco Peninsula Coast

Mostly clear in the evening then becoming partly cloudy. Lows in the upper 50s. West Winds around 5 Mph in the evening. Becoming light.

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Half Moon Bay - Princeton Temperature Statistics

September Temperature

Half Moon Bay Airport (0.6 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    61.9 °F

  • Highest 8 September, 2025

    71.6 °F

Climate (2020–Present)

Half Moon Bay Airport (0.6 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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