Portola Valley Weather Forecast

    • 43
    • 65

    Rain Likely

    • 47
    • 62

    Mostly Cloudy

    • 51
    • 63

    Rain Likely

    • 52
    • 62

    Rain Likely

    • 50
    • 61

    Rain Likely

    • 47
    • 59

    Rain Likely

Today 17 Dec San Francisco Bay Shoreline

Mostly cloudy. A slight chance of rain. Highs in the lower 60s. Northwest Winds 5 to 10 Mph.

Tonight 17 Dec San Francisco Bay Shoreline

Partly cloudy in the evening then becoming mostly cloudy. Patchy fog in the Evening, then Areas of dense fog after midnight. Lows in the upper 40s. West Winds 5 to 10 Mph becoming southeast after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Portola Valley Temperature Statistics

December Temperature

Palo Alto Airport (8.1 miles)

  • Lowest 13 December, 2025

    33.8 °F

  • Average December

    48.9 °F

  • Highest 3 December, 2025

    64.4 °F

Climate (2020–Present)

Palo Alto Airport (8.1 miles)

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  • Average Low 2020–2025

    50.7 °F

  • Average 2020–2025

    60.3 °F

  • Average High 2020–2025

    67.1 °F
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