Spring Valley Weather Forecast

    • 62
    • 81

    Mostly Sunny

    • 64
    • 82

    Mostly Sunny

    • 65
    • 85

    Mostly Sunny

    • 68
    • 88

    Mostly Sunny

    • 72
    • 94

    Mostly Sunny

    • 73
    • 96

    Mostly Sunny

    • 75
    • 98

    Hot

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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Spring Valley Temperature Statistics

September Temperature

Gillespie Field Airport (5.6 miles)

  • Lowest 3 September, 2026

    57.2 °F

  • Average September

    75.7 °F

  • Highest 9 September, 2026

    107.6 °F

Climate (2021–2026)

Gillespie Field Airport (5.6 miles)

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  • Average Low 2021–2026

    53.6 °F

  • Average 2021–2026

    60.7 °F

  • Average High 2021–2026

    76.3 °F
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