San Gregorio Weather Forecast

    • 57
    • 68

    Mostly Sunny

    • 62
    • 72

    Mostly Cloudy

    • 64
    • 80

    Mostly Cloudy

    • 58
    • 73

    Partly Sunny

    • 56
    • 66

    Mostly Cloudy

    • 55
    • 65

    Partly Sunny

    • 55
    • 66

    Partly Sunny

Today 7 Sep San Francisco Peninsula Coast

Sunny. Highs in the lower 70s. Light Winds. Becoming northwest around 5 Mph in the afternoon.

Tonight 7 Sep San Francisco Peninsula Coast

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

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San Gregorio Temperature Statistics

September Temperature

Half Moon Bay Airport (14.3 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 (14.3 miles)

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  • Average Low 2021–2026

    48.7 °F

  • Average 2021–2026

    55.2 °F

  • Average High 2021–2026

    61.1 °F
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