Sierra Weather Forecast

    • 56
    • 77

    Mostly Sunny

    • 56
    • 77

    Becoming Sunny

    • 60
    • 84

    Sunny

    • 64
    • 87

    Slight Chance Rain

    • 67
    • 89

    Partly Sunny

    • 63
    • 88

    Mostly Sunny

    • 60
    • 82

    Partly Sunny

Today 5 Sep Santa Clara Valley Including San Jose

Sunny. Highs in the mid 70s to lower 80s. Northwest Winds 10 to 20 Mph.

Tonight 5 Sep Santa Clara Valley Including San Jose

Mostly clear. Lows in the mid 50s. Northwest Winds 10 to 20 Mph. Becoming 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 2 September, 2026

    57.2 °F

  • Average September

    70.3 °F

  • Highest 2 September, 2026

    78.8 °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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