Sierra Weather Forecast

    • 45
    • 70

    Partly Sunny

    • 42
    • 68

    Mostly Sunny

    • 45
    • 68

    Mostly Cloudy

    • 47
    • 67

    Mostly Cloudy

    • 44
    • 65

    Mostly Sunny

    • 43
    • 64

    Areas Fog

    • 43
    • 63

    Patchy Fog

Today 18 Jan Santa Clara Valley Including San Jose

Mostly cloudy late in the morning then becoming partly cloudy. Highs around 70. Light Winds. Becoming northwest around 5 Mph in the afternoon.

Tonight 18 Jan Santa Clara Valley Including San Jose

Partly cloudy. Lows in the mid 40s. Light Winds.

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  • Temperature Real-Time

Sierra Temperature Statistics

January Temperature

San Jose / Reid / Hillv (1.9 miles)

  • Lowest 10 January, 2026

    32 °F

  • Average January

    54.8 °F

  • Highest 16 January, 2026

    71.6 °F

Climate (2021–Present)

San Jose / Reid / Hillv (1.9 miles)

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  • Average Low 2021–2026

    51.7 °F

  • Average 2021–2026

    63.5 °F

  • Average High 2021–2026

    72.1 °F
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