When to go · Portola Valley
Portola Valley in September
Great month. Inside Portola Valley's best window: Mar–May, Sep–Nov.
Key facts
- Verdict
- Great
- Temperature
- 26°C (79°F)79°F (26°C) / 13°C (55°F)55°F (13°C)
- average high / low
- Rain days
- 2
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Inside Portola Valley's best window: Mar–May, Sep–Nov.
Is another month better than September?
No other month rates higher than September for Portola Valley in this guide.
Weather in September
- Portola ValleyHighs around 26 °C (79 °F), lows around 13 °C (55 °F), rain on about 2 daysHighs around 79 °F (26 °C), lows around 55 °F (13 °C), rain on about 2 days
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Labor Day big impact
1st Monday of September · United States
End of summer; last big road-trip weekend.
Crowds and prices
- Crowds · United States overall
- Medium
- Prices · United States overall
- Medium
United States overall: After Labor Day the crowds drop and parks stay open; Florida and the Gulf are at hurricane peak.
Compare two months
Weather, crowds and prices for any two months in Portola Valley, side by side.
Verdict
Sep: Great
Mar: Great
Daytime high
Sep: 26 °C (79 °F)79 °F (26 °C)
Mar: 18 °C (64 °F)64 °F (18 °C)
Night low
Sep: 13 °C (55 °F)55 °F (13 °C)
Mar: 8 °C (46 °F)46 °F (8 °C)
Rain days
Sep: 2 (better)
Mar: 9
Crowds
Sep: Medium
Mar: Medium
Prices
Sep: Medium
Mar: Medium
Festivals listed
Sep: 1
Mar: 2
September: Inside Portola Valley's best window: Mar–May, Sep–Nov.
March: Inside Portola Valley's best window: Mar–May, Sep–Nov.
Portola Valley: figures are long-term averages from this guide, not a forecast.
What to pack
Nothing unusual for the weather this month.