Old Gilroy Weather Forecast

    • 53
    • 80

    Becoming Sunny

    • 52
    • 84

    Mostly Sunny

    • 53
    • 84

    Mostly Sunny

    • 56
    • 88

    Mostly Sunny

    • 58
    • 93

    Mostly Sunny

    • 57
    • 91

    Mostly Sunny

Today 17 Aug Santa Clara Valley Including San Jose

Partly cloudy in the morning then becoming sunny. Highs in the 70s to lower 80s. Northwest Winds 5 to 15 Mph.

Tonight 17 Aug Santa Clara Valley Including San Jose

Clear in the evening then becoming partly cloudy. Lows in the mid 50s. Northwest Winds 5 to 15 Mph.

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Old Gilroy Temperature Statistics

August Temperature

South County Airport of Santa Clara County (6.8 miles)

  • Lowest 5 August, 2025

    51.8 °F

  • Average August

    67.2 °F

  • Highest 6 August, 2025

    95 °F

Climate (2020–Present)

South County Airport of Santa Clara County (6.8 miles)

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    58.4 °F

  • Average High 2020–2025

    73.1 °F
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