Santee Recreational Lakes Weather Forecast

    • 63
    • 79

    Mostly Cloudy

    • 64
    • 85

    Becoming Sunny

    • 66
    • 86

    Mostly Sunny

    • 68
    • 87

    Mostly Sunny

    • 68
    • 90

    Mostly Sunny

    • 68
    • 91

    Mostly Sunny

    • 65
    • 87

    Mostly Sunny

Today 21 Sep San Diego County Inland Valleys

Partly cloudy in the morning. Becoming mostly sunny. Highs 82 to 87.

Tonight 21 Sep San Diego County Inland Valleys

Partly cloudy. Patchy fog overnight. Cooler. Lows 51 to 61. Areas of Winds west to 10 Mph this evening becoming light.

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Santee Recreational Lakes Temperature Statistics

September Temperature

Gillespie Field Airport (1.9 miles)

  • Lowest 3 September, 2026

    57.2 °F

  • Average September

    76 °F

  • Highest 9 September, 2026

    107.6 °F

Climate (2021–2026)

Gillespie Field Airport (1.9 miles)

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  • Average Low 2021–2026

    53.6 °F

  • Average 2021–2026

    60.6 °F

  • Average High 2021–2026

    76.3 °F
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