Yellowstone Park Weather Forecast

    • 58
    • 79

    Increasing Clouds

    • 58
    • 76

    Partly Sunny

    • 59
    • 78

    Partly Sunny

    • 59
    • 79

    Partly Sunny

    • 59
    • 77

    Mostly Cloudy

    • 58
    • 74

    Mostly Cloudy

    • 57
    • 74

    Partly Sunny

Today 4 Sep Santa Clara Valley Including San Jose

Sunny. Highs in the 70s to upper 80s. Northwest Winds 5 to 15 Mph.

Tonight 4 Sep Santa Clara Valley Including San Jose

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

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Yellowstone Park Temperature Statistics

September Temperature

San Jose, San Jose International Airport (5 miles)

  • Lowest 1 September, 2025

    62.1 °F

  • Average September

    73.6 °F

  • Highest 1 September, 2025

    89.1 °F

Climate (2020–Present)

San Jose, San Jose International Airport (5 miles)

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  • Average Low 2020–2025

    51.8 °F

  • Average 2020–2025

    61.6 °F

  • Average High 2020–2025

    72.6 °F
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