Gilroy Weather Forecast

    • 61
    • 81

    Chance Rain Showers

    • 59
    • 83

    Chance Rain Showers

    • 58
    • 87

    Mostly Sunny

    • 60
    • 90

    Mostly Sunny

    • 62
    • 96

    Mostly Sunny

    • 61
    • 87

    Slight Chance Thunderstorms

Today 18 Sep Santa Clara Valley Including San Jose

Mostly cloudy. A slight chance of Showers in the Morning, then a chance of Showers and isolated Thunderstorms in the afternoon. Highs in the lower 80s. South Winds 5 to 10 Mph.

Tonight 18 Sep Santa Clara Valley Including San Jose

Mostly cloudy. A chance of Showers and isolated Thunderstorms. Lows in the lower 60s. Southwest Winds around 5 Mph.

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  • Temperature Real-Time

Gilroy Temperature Statistics

September Temperature

South County Airport of Santa Clara County (5 miles)

  • Lowest 7 September, 2025

    55.4 °F

  • Average September

    68.6 °F

  • Highest 1 September, 2025

    96.8 °F

Climate (2020–Present)

South County Airport of Santa Clara County (5 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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