Otay County Open Space Preserve Weather Forecast

    • 57
    • 74

    Mostly Sunny

    • 61
    • 75

    Mostly Sunny

    • 62
    • 79

    Mostly Sunny

    • 66
    • 83

    Mostly Sunny

    • 70
    • 89

    Mostly Sunny

    • 72
    • 91

    Sunny

    • 73
    • 92

    Sunny

Today 28 Sep San Diego County Inland Valleys

Mostly sunny. Hot. Highs around 100 in the western Valleys to 91 to 96 near the Foothills.

Tonight 28 Sep San Diego County Inland Valleys

Mostly clear. Cooler. Lows 52 to 59. Areas of Winds west to 10 Mph this evening becoming light.

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Otay County Open Space Preserve Temperature Statistics

September Temperature

San Diego, Brown Field Municipal Airport (6.8 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 (6.8 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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