San Martin Weather Forecast

    • 58
    • 90

    Mostly Sunny

    • 66
    • 94

    Partly Sunny

    • 69
    • 101

    Hot

    • 62
    • 97

    Hot

    • 59
    • 90

    Mostly Sunny

    • 57
    • 85

    Mostly Sunny

Today 7 Sep Santa Clara Valley Including San Jose

Sunny. Highs in the 80s to lower 90s. Light Winds. Becoming northwest 5 to 10 Mph in the afternoon.

Tonight 7 Sep Santa Clara Valley Including San Jose

Mostly clear. Lows around 60. Northwest Winds 5 to 10 Mph in the evening. Becoming light.

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San Martin Temperature Statistics

September Temperature

South County Airport of Santa Clara County (0.6 miles)

  • Lowest 2 September, 2026

    53.6 °F

  • Average September

    65.1 °F

  • Highest 4 September, 2026

    80.6 °F

Climate (2021–2026)

South County Airport of Santa Clara County (0.6 miles)

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  • Average Low 2021–2026

    48 °F

  • Average 2021–2026

    58.9 °F

  • Average High 2021–2026

    73.1 °F
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