South County Airport of Santa Clara County Weather Forecast

    • 52
    • 88

    Becoming Sunny

    • 51
    • 89

    Mostly Sunny

    • 50
    • 84

    Mostly Sunny

    • 49
    • 78

    Partly Sunny

    • 49
    • 80

    Mostly Sunny

    • 49
    • 78

    Mostly Sunny

Today 20 May Santa Clara Valley Including San Jose

Sunny in the morning then becoming partly cloudy. Highs in the upper 80s. Southwest Winds up to 5 Mph. Becoming west 5 to 15 Mph in the afternoon.

Tonight 20 May Santa Clara Valley Including San Jose

Mostly clear. Lows in the mid 50s. West Winds 5 to 15 Mph in the evening. Becoming light.

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South County Airport of Santa Clara County Temperature Statistics

May Temperature

South County Airport of Santa Clara County (0 miles)

  • Lowest 4 May, 2026

    46.4 °F

  • Average May

    61.2 °F

  • Highest 11 May, 2026

    86 °F

Climate (2021–Present)

South County Airport of Santa Clara County (0 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    58.7 °F

  • Average High 2021–2026

    73.1 °F
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