Old Gilroy Weather Forecast

    • 55
    • 90

    Becoming Sunny

    • 56
    • 94

    Mostly Sunny

    • 58
    • 92

    Mostly Sunny

    • 60
    • 94

    Mostly Sunny

    • 60
    • 93

    Mostly Sunny

    • 60
    • 93

    Mostly Sunny

Today 29 Sep Santa Clara Valley Including San Jose

Sunny. Highs in the mid 80s. Northwest Winds 5 to 15 Mph.

Tonight 29 Sep Santa Clara Valley Including San Jose

Mostly clear. Lows in the upper 50s. West Winds 5 to 10 Mph. Becoming southeast after midnight.

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Old Gilroy Temperature Statistics

September Temperature

South County Airport of Santa Clara County (6.8 miles)

  • Lowest 7 September, 2026

    50 °F

  • Average September

    67.3 °F

  • Highest 9 September, 2026

    102.2 °F

Climate (2021–2026)

South County Airport of Santa Clara County (6.8 miles)

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  • Average Low 2021–2026

    48 °F

  • Average 2021–2026

    58.9 °F

  • Average High 2021–2026

    73.1 °F
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