San Ysidro Weather Forecast

    • 67
    • 77

    Decreasing Clouds

    • 69
    • 81

    Slight Chance Thunderstorms

    • 69
    • 81

    Mostly Cloudy

    • 69
    • 80

    Chance Rain Showers

    • 69
    • 79

    Chance Rain Showers

    • 67
    • 78

    Patchy Fog

Today 15 Sep San Diego County Coastal Areas

Mostly cloudy with patchy fog in the morning. Becoming partly cloudy. Highs 73 to 78 near the coast to 80 to 85 inland. Light Winds becoming west 10 Mph in the afternoon.

Tonight 15 Sep San Diego County Coastal Areas

Partly cloudy. Patchy fog overnight. Lows 63 to 67. Light Winds.

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San Ysidro Temperature Statistics

September Temperature

San Diego, Brown Field Municipal Airport (3.1 miles)

  • Lowest 12 September, 2025

    57 °F

  • Average September

    71.3 °F

  • Highest 7 September, 2025

    88 °F

Climate (2020–Present)

San Diego, Brown Field Municipal Airport (3.1 miles)

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  • Average Low 2020–2025

    54 °F

  • Average 2020–2025

    63.4 °F

  • Average High 2020–2025

    73.9 °F
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