Upper Sierra Weather Forecast

    • 57
    • 83

    Increasing Clouds

    • 56
    • 76

    Mostly Cloudy

    • 57
    • 79

    Partly Sunny

    • 58
    • 80

    Mostly Sunny

    • 63
    • 88

    Mostly Sunny

    • 62
    • 91

    Mostly Sunny

Today 19 Sep Santa Clara Valley Including San Jose

Partly cloudy in the morning then becoming sunny. Patchy fog in the morning. Highs in the 80s. Southeast Winds up to 5 Mph increasing to northwest 10 to 15 Mph in the afternoon.

Tonight 19 Sep Santa Clara Valley Including San Jose

Mostly clear in the evening then becoming mostly cloudy. Lows in the mid 50s. Northwest Winds 5 to 15 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Upper Sierra Temperature Statistics

September Temperature

San Jose / Reid / Hillv (5 miles)

  • Lowest 7 September, 2026

    53.6 °F

  • Average September

    72.8 °F

  • Highest 9 September, 2026

    98.6 °F

Climate (2021–2026)

San Jose / Reid / Hillv (5 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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