Downing - Whitethorne Weather Forecast

    • 56
    • 75

    Increasing Clouds

    • 55
    • 77

    Mostly Sunny

    • 55
    • 75

    Mostly Sunny

    • 59
    • 82

    Mostly Sunny

    • 61
    • 85

    Partly Sunny

    • 63
    • 83

    Slight Chance Rain

Today 4 Sep Santa Clara Valley Including San Jose

Partly cloudy in the morning then becoming sunny. Highs in the 70s. Northwest Winds around 5 Mph increasing to 10 to 20 Mph in the afternoon.

Tonight 4 Sep Santa Clara Valley Including San Jose

Clear in the evening then becoming partly cloudy. Lows in the mid 50s. Northwest Winds 10 to 20 Mph. Becoming 5 to 10 Mph after midnight.

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Downing - Whitethorne Temperature Statistics

September Temperature

San Jose, San Jose International Airport (3.7 miles)

  • Lowest 2 September, 2026

    59 °F

  • Average September

    68.2 °F

  • Highest 2 September, 2026

    77 °F

Climate (2021–2026)

San Jose, San Jose International Airport (3.7 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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