South Los Altos Weather Forecast

    • 56
    • 76

    Decreasing Clouds

    • 56
    • 77

    Becoming Sunny

    • 56
    • 80

    Mostly Sunny

    • 60
    • 87

    Mostly Sunny

    • 60
    • 87

    Partly Sunny

    • 56
    • 81

    Mostly Sunny

    • 54
    • 80

    Mostly Sunny

Today 20 Sep San Francisco Bay Shoreline

Partly cloudy in the morning then becoming sunny. Highs in the 60s to upper 70s.

Tonight 20 Sep San Francisco Bay Shoreline

Mostly cloudy. Lows in the upper 50s. West Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Los Altos Temperature Statistics

September Temperature

San Jose, San Jose International Airport (7.5 miles)

  • Lowest 5 September, 2026

    54.6 °F

  • Average September

    70.5 °F

  • Highest 9 September, 2026

    97.6 °F

Climate (2021–2026)

San Jose, San Jose International Airport (7.5 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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