Downtown San Jose Weather Forecast

    • 59
    • 85

    Increasing Clouds

    • 60
    • 82

    Partly Sunny

    • 58
    • 78

    Partly Sunny

    • 60
    • 80

    Mostly Sunny

    • 59
    • 81

    Mostly Sunny

    • 59
    • 79

    Mostly Sunny

Today 3 Sep Santa Clara Valley Including San Jose

Partly cloudy in the morning then becoming sunny. Highs in the 80s to lower 90s. Light Winds. Becoming northwest 10 to 15 Mph in the afternoon.

Tonight 3 Sep Santa Clara Valley Including San Jose

Mostly clear in the evening then becoming partly cloudy. Lows in the upper 50s. West Winds 5 to 10 Mph.

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Downtown San Jose Temperature Statistics

September Temperature

San Jose, San Jose International Airport (2.5 miles)

  • Lowest 1 September, 2025

    62.1 °F

  • Average September

    73.8 °F

  • Highest 1 September, 2025

    89.1 °F

Climate (2020–Present)

San Jose, San Jose International Airport (2.5 miles)

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  • Average Low 2020–2025

    51.8 °F

  • Average 2020–2025

    61.5 °F

  • Average High 2020–2025

    72.6 °F
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