Sierra Weather Forecast

    • 53
    • 72

    Decreasing Clouds

    • 56
    • 77

    Mostly Sunny

    • 60
    • 86

    Sunny

    • 60
    • 89

    Mostly Sunny

    • 59
    • 86

    Partly Sunny

    • 59
    • 84

    Mostly Sunny

Today 27 Sep Santa Clara Valley Including San Jose

Mostly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the lower 70s. Light Winds becoming northwest 10 to 15 Mph in the afternoon.

Tonight 27 Sep Santa Clara Valley Including San Jose

Mostly clear in the evening then becoming partly cloudy. Lows in the lower 50s. Northwest Winds 5 to 15 Mph becoming southwest 5 to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sierra Temperature Statistics

September Temperature

San Jose / Reid / Hillv (1.9 miles)

  • Lowest 7 September, 2026

    53.6 °F

  • Average September

    71.8 °F

  • Highest 9 September, 2026

    98.6 °F

Climate (2021–2026)

San Jose / Reid / Hillv (1.9 miles)

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  • Average Low 2021–2026

    52.1 °F

  • Average 2021–2026

    63.7 °F

  • Average High 2021–2026

    72.2 °F
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