Portola State Park Weather Forecast

    • 65
    • 85

    Mostly Cloudy

    • 67
    • 93

    Partly Sunny

    • 58
    • 87

    Mostly Sunny

    • 53
    • 78

    Mostly Sunny

    • 51
    • 71

    Mostly Sunny

    • 52
    • 74

    Mostly Sunny

    • 52
    • 74

    Partly Sunny

Today 8 Sep Santa Cruz Mountains

Partly cloudy. Highs in the 80s to lower 90s. Light Winds.

Tonight 8 Sep Santa Cruz Mountains

Mostly cloudy in the evening then becoming partly cloudy. Lows in the mid 60s to lower 70s. Light Winds. Becoming northeast up to 5 Mph after midnight.

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Portola State Park Temperature Statistics

September Temperature

Palo Alto Airport (14.9 miles)

  • Lowest 6 September, 2026

    51.8 °F

  • Average September

    67.7 °F

  • Highest 2 September, 2026

    77 °F

Climate (2021–2026)

Palo Alto Airport (14.9 miles)

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  • Average Low 2021–2026

    51.2 °F

  • Average 2021–2026

    60.7 °F

  • Average High 2021–2026

    67.4 °F
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