Old Gilroy Weather Forecast

    • 41
    • 65

    Mostly Sunny

    • 43
    • 67

    Mostly Sunny

    • 42
    • 68

    Mostly Sunny

    • 44
    • 69

    Mostly Sunny

    • 45
    • 71

    Mostly Sunny

    • 46
    • 72

    Mostly Sunny

    • 46
    • 72

    Mostly Sunny

Today 5 Dec Santa Clara Valley Including San Jose

Sunny. Highs in the lower 60s. Northwest Winds 5 to 10 Mph.

Tonight 5 Dec Santa Clara Valley Including San Jose

Mostly clear. Lows in the mid 40s. Northwest Winds 5 to 10 Mph.

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Old Gilroy Temperature Statistics

December Temperature

South County Airport of Santa Clara County (6.8 miles)

  • Lowest 2 December, 2025

    37.4 °F

  • Average December

    48.8 °F

  • Highest 2 December, 2025

    66.2 °F

Climate (2020–Present)

South County Airport of Santa Clara County (6.8 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    58.4 °F

  • Average High 2020–2025

    72.8 °F
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