Spring Valley Weather Forecast

    • 62
    • 81

    Increasing Clouds

    • 61
    • 79

    Mostly Sunny

    • 61
    • 80

    Mostly Sunny

    • 61
    • 81

    Mostly Sunny

    • 61
    • 81

    Mostly Sunny

    • 62
    • 82

    Mostly Sunny

Today 14 Sep San Diego County Inland Valleys

Partly cloudy with patchy fog this morning. Becoming sunny. Highs 80 to 84 in the western Valleys to 84 to 89 near the Foothills. Areas of Winds southwest to 10 Mph.

Tonight 14 Sep San Diego County Inland Valleys

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 55 to 61. Areas of Winds southwest to 10 Mph in the 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

    76.6 °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

    60.6 °F

  • Average High 2021–2026

    76.3 °F
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