Sierra Weather Forecast

    • 70
    • 90

    Increasing Clouds

    • 73
    • 98

    Hot

    • 62
    • 92

    Mostly Sunny

    • 58
    • 85

    Mostly Sunny

    • 56
    • 79

    Mostly Sunny

    • 57
    • 80

    Mostly Sunny

    • 58
    • 81

    Mostly Sunny

Today 8 Sep Santa Clara Valley Including San Jose

Sunny. Highs in the upper 80s to mid 90s. Northwest Winds 5 to 10 Mph.

Tonight 8 Sep Santa Clara Valley Including San Jose

Partly cloudy late in the evening then becoming mostly cloudy. Lows around 70. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sierra Temperature Statistics

September Temperature

San Jose / Reid / Hillv (1.9 miles)

  • Lowest 5 September, 2026

    55.4 °F

  • Average September

    69.7 °F

  • Highest 5 September, 2026

    80.6 °F

Climate (2021–2026)

San Jose / Reid / Hillv (1.9 miles)

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  • Average Low 2021–2026

    52 °F

  • Average 2021–2026

    63.7 °F

  • Average High 2021–2026

    72.2 °F
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