Downtown San Jose Weather Forecast

    • 56
    • 78

    Mostly Sunny

    • 56
    • 78

    Becoming Sunny

    • 61
    • 84

    Mostly Sunny

    • 65
    • 87

    Slight Chance Rain

    • 68
    • 89

    Partly Sunny

    • 64
    • 89

    Mostly Sunny

    • 61
    • 83

    Partly Sunny

Today 5 Sep Santa Clara Valley Including San Jose

Sunny. Highs in the mid 70s to lower 80s. Northwest Winds 10 to 20 Mph.

Tonight 5 Sep Santa Clara Valley Including San Jose

Mostly clear. Lows in the mid 50s. Northwest Winds 10 to 20 Mph. Becoming 5 to 10 Mph after midnight.

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Downtown San Jose Temperature Statistics

September Temperature

San Jose, San Jose International Airport (2.5 miles)

  • Lowest 3 September, 2026

    59 °F

  • Average September

    68.9 °F

  • Highest 3 September, 2026

    79 °F

Climate (2021–2026)

San Jose, San Jose International Airport (2.5 miles)

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  • Average Low 2021–2026

    52.3 °F

  • Average 2021–2026

    62.1 °F

  • Average High 2021–2026

    72.8 °F
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