Half Moon Bay - Princeton Weather Forecast

    • 49
    • 70

    Mostly Sunny

    • 49
    • 71

    Mostly Sunny

    • 48
    • 67

    Areas Fog

    • 49
    • 65

    Areas Fog

    • 50
    • 63

    Mostly Cloudy

    • 50
    • 61

    Mostly Cloudy

Today 18 May San Francisco Peninsula Coast

Sunny. Highs in the mid 70s. North Winds 10 to 20 Mph.

Tonight 18 May San Francisco Peninsula Coast

Clear. Lows in the mid 50s. North Winds 10 to 20 Mph with Gusts to around 35 Mph.

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Half Moon Bay - Princeton Temperature Statistics

May Temperature

Half Moon Bay Airport (0.6 miles)

  • Lowest 14 May, 2026

    46.4 °F

  • Average May

    55 °F

  • Highest 6 May, 2026

    62.6 °F

Climate (2021–Present)

Half Moon Bay Airport (0.6 miles)

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  • Average Low 2021–2026

    48.5 °F

  • Average 2021–2026

    55 °F

  • Average High 2021–2026

    60.9 °F
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