Upper Otay Lake Weather Forecast

    • 69
    • 91

    Mostly Sunny

    • 64
    • 86

    Mostly Sunny

    • 62
    • 82

    Mostly Sunny

    • 61
    • 82

    Mostly Sunny

    • 60
    • 80

    Mostly Sunny

    • 61
    • 81

    Mostly Sunny

Today 11 Sep San Diego County Inland Valleys

Sunny. Highs 89 to 93 in the western Valleys to 91 to 96 near the Foothills. Areas of Winds southwest to 10 Mph becoming 10 to 15 Mph this afternoon.

Tonight 11 Sep San Diego County Inland Valleys

Mostly clear. Patchy fog overnight. Lows 65 to 69. Areas of Winds southwest to 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Upper Otay Lake Temperature Statistics

September Temperature

San Diego, Brown Field Municipal Airport (6.2 miles)

  • Lowest 3 September, 2026

    56.6 °F

  • Average September

    76.9 °F

  • Highest 7 September, 2026

    98.7 °F

Climate (2021–2026)

San Diego, Brown Field Municipal Airport (6.2 miles)

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  • Average Low 2021–2026

    54.3 °F

  • Average 2021–2026

    64 °F

  • Average High 2021–2026

    74.3 °F
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