Downing - Whitethorne Weather Forecast

    • 47
    • 54

    Partly Sunny

    • 55
    • 66

    Chance Rain

    • 47
    • 66

    Slight Chance Rain

    • 49
    • 65

    Chance Rain

    • 52
    • 63

    Chance Rain

Today 15 Dec Santa Clara Valley Including San Jose

Mostly cloudy in the morning then becoming partly cloudy. Highs in the lower 60s. Northwest Winds 5 to 10 Mph.

Tonight 15 Dec Santa Clara Valley Including San Jose

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows in the upper 40s. Northwest Winds 5 to 10 Mph.

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Downing - Whitethorne Temperature Statistics

December Temperature

San Jose, San Jose International Airport (3.7 miles)

  • Lowest 12 December, 2025

    39 °F

  • Average December

    48.8 °F

  • Highest 3 December, 2025

    64.9 °F

Climate (2020–Present)

San Jose, San Jose International Airport (3.7 miles)

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  • Average Low 2020–2025

    51.9 °F

  • Average 2020–2025

    61.5 °F

  • Average High 2020–2025

    72.4 °F
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