Sierra Weather Forecast

    • 56
    • 83

    Increasing Clouds

    • 55
    • 78

    Partly Sunny

    • 56
    • 80

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

    • 57
    • 84

    Mostly Sunny

    • 57
    • 83

    Partly Sunny

Today 15 Sep Santa Clara Valley Including San Jose

Sunny. Highs in the lower to mid 80s. Southeast Winds up to 5 Mph. Becoming west in the afternoon.

Tonight 15 Sep Santa Clara Valley Including San Jose

Mostly clear in the evening then becoming partly cloudy. Lows in the mid 50s. South Winds 5 to 10 Mph.

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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

    74.4 °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

    72.3 °F
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