Casa De Oro-Mount Helix Weather Forecast

    • 47
    • 70

    Mostly Sunny

    • 48
    • 70

    Mostly Sunny

    • 50
    • 73

    Mostly Sunny

    • 53
    • 77

    Mostly Sunny

    • 53
    • 81

    Mostly Sunny

    • 53
    • 78

    Sunny

Today 5 Dec San Diego County Inland Valleys

Mostly sunny. Highs 68 to 73. Light Winds.

Tonight 5 Dec San Diego County Inland Valleys

Clear. Lows 41 to 47 in wind Sheltered Areas to 45 to 50 in warmer Locations. Light Winds.

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Casa De Oro-Mount Helix Temperature Statistics

December Temperature

Gillespie Field Airport (4.3 miles)

  • Lowest 2 December, 2025

    41 °F

  • Average December

    53.8 °F

  • Highest 2 December, 2025

    69.8 °F

Climate (2020–Present)

Gillespie Field Airport (4.3 miles)

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  • Average Low 2020–2025

    53 °F

  • Average 2020–2025

    60.1 °F

  • Average High 2020–2025

    75.8 °F
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