Half Moon Bay - Princeton Weather Forecast

    • 57
    • 69

    Mostly Sunny

    • 61
    • 72

    Mostly Cloudy

    • 63
    • 78

    Mostly Cloudy

    • 59
    • 71

    Mostly Cloudy

    • 57
    • 66

    Mostly Cloudy

    • 57
    • 65

    Partly Sunny

    • 57
    • 66

    Partly Sunny

Today 7 Sep San Francisco Peninsula Coast

Sunny. Highs in the lower 70s. Northwest Winds around 5 Mph.

Tonight 7 Sep San Francisco Peninsula Coast

Mostly clear. Lows in the upper 50s. Northwest Winds up to 5 Mph in the evening. Becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Half Moon Bay - Princeton Temperature Statistics

September Temperature

Half Moon Bay Airport (0.6 miles)

  • Lowest 4 September, 2026

    51.8 °F

  • Average September

    61.1 °F

  • Highest 4 September, 2026

    68 °F

Climate (2021–2026)

Half Moon Bay Airport (0.6 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    48.7 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    61.1 °F
Get WillyWeather+ to remove ads