South San Ysidro Weather Forecast

    • 48
    • 73

    Isolated Thunderstorms

    • 48
    • 74

    Thunderstorms

    • 48
    • 75

    Mostly Sunny

    • 49
    • 77

    Mostly Sunny

    • 45
    • 77

    Mostly Sunny

    • 44
    • 75

    Mostly Sunny

Today 18 Sep Glorieta Mesa Including Glorieta Pass

Mostly sunny. Isolated Showers and Thunderstorms this afternoon. Highs in the lower 70s. Chance of rain 20 percent.

Tonight 18 Sep Glorieta Mesa Including Glorieta Pass

Partly cloudy. Isolated Showers and Thunderstorms in the evening. Lows in the upper 40s. East Winds around 15 Mph. Chance of rain 20 percent.

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South San Ysidro Temperature Statistics

September Temperature

Las Vegas Municipal Airport (28.6 miles)

  • Lowest 15 September, 2025

    42.1 °F

  • Average September

    61.7 °F

  • Highest 3 September, 2025

    81 °F

Climate (2020–Present)

Las Vegas Municipal Airport (28.6 miles)

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  • Average Low 2020–2025

    37.5 °F

  • Average 2020–2025

    51.4 °F

  • Average High 2020–2025

    65.7 °F
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