San Ysidro Weather Forecast

    • 69
    • 81

    Cloudy

    • 64
    • 77

    Decreasing Clouds

    • 67
    • 78

    Partly Sunny

    • 68
    • 81

    Mostly Sunny

    • 70
    • 84

    Mostly Sunny

    • 73
    • 87

    Mostly Sunny

    • 73
    • 91

    Mostly Sunny

Today 27 Sep San Diego County Coastal Areas

Mostly sunny. Highs 84 to 89 near the coast to 92 to 95 inland.

Tonight 27 Sep San Diego County Coastal Areas

Mostly cloudy. A slight chance of Showers this evening. Lows 64 to 69. Light Winds. Chance of measurable precipitation 20 percent.

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San Ysidro Temperature Statistics

September Temperature

San Diego, Brown Field Municipal Airport (3.1 miles)

  • Lowest 3 September, 2026

    56.6 °F

  • Average September

    75.5 °F

  • Highest 9 September, 2026

    100.7 °F

Climate (2021–2026)

San Diego, Brown Field Municipal Airport (3.1 miles)

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  • Average Low 2021–2026

    54.3 °F

  • Average 2021–2026

    64 °F

  • Average High 2021–2026

    74.4 °F
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