Spring Valley Weather Forecast

    • 50
    • 72

    Increasing Clouds

    • 53
    • 67

    Mostly Cloudy

    • 57
    • 67

    Rain Showers

    • 57
    • 66

    Rain Showers

    • 52
    • 66

    Rain Showers Likely

    • 48
    • 63

    Rain Showers Likely

    • 46
    • 64

    Chance Rain Showers

Today 21 Dec San Diego County Inland Valleys

Partly cloudy this morning. Becoming mostly sunny. Highs 69 to 74 in the western Valleys to 73 to 78 near the Foothills. Light Winds becoming west 10 Mph this afternoon.

Tonight 21 Dec San Diego County Inland Valleys

Partly cloudy. Patchy fog overnight. Lows 42 to 51 in wind Sheltered Areas to 48 to 56 in warmer Locations. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Spring Valley Temperature Statistics

December Temperature

Gillespie Field Airport (5.6 miles)

  • Lowest 5 December, 2025

    39.2 °F

  • Average December

    53.9 °F

  • Highest 10 December, 2025

    86 °F

Climate (2020–Present)

Gillespie Field Airport (5.6 miles)

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  • Average Low 2020–2025

    53.1 °F

  • Average 2020–2025

    60.2 °F

  • Average High 2020–2025

    75.8 °F
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