TODAY AUG16
TEMPERATURE70
HUMIDITY65
PRESSURE
WIND COND.11 3
  • 8753Fri
  • 8953Sat
  • 8753Sun
  • 8553Mon
  • 8553Tue
daynightWeather update from LOS ALTOS at

Portola Valley Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January42°F61°F50°F2.4"
February45°F63°F53°F2.4"
March47°F67°F56°F2.0"
April49°F70°F58°F1.3"
May53°F73°F61°F0.3"
June56°F77°F65°F0.2"
July59°F78°F67°F0.0"
August59°F78°F66°F0.0"
September57°F80°F67°F0.1"
October53°F75°F63°F0.7"
November47°F67°F56°F1.3"
December42°F60°F51°F2.6"

Did you know?

  • The highest monthly average temperature in Portola Valley for July is 67 degrees.
  • The lowest monthly average temperature in Portola Valley for January is 50 degrees.
  • The most monthly precipitation in Portola Valley occurs in December with 2.6 inches.
  • The air quality index in Portola Valley is 3% better than the national average.
  • The pollution index in Portola Valley is 126% worse than the national average.

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Compare Portola Valley, CA Weather To Other Cities

Portola Valley air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexPortola ValleyCaliforniaNational
Air quality index485550
Pollution index11,477,20018,106,7265,066,862

Portola Valley air quality information

MeasurementTotal
Days measured365
Days with good air quality204
Days with moderate air quality153
Days w/ poor A.Q. for sensitive groups7
Days with unhealthy air quality1

Portola Valley air quality information

PollutantTotal
Arsenic0.070%
Benzene0.110%
Carbon Tetrachloride0.000%
Lead0.160%
Mercury0.090%

Average monthly Portola Valley temperature with heat index

Portola Valley monthly precipitation with daily maximum

Portola Valley monthly snow depth with daily maximum

Portola Valley monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Loma Mar, CA1503628%
Pescadero, CA1,0403628%
Lexington Hills, CA2,6173628%
Palo Alto, CA66,649484%
San Mateo, CA102,224484%
Portola Valley, CA4,550484%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Niskayuna, NY4,5483628%
Gibraltar, MI4,547688%
Mullins, SC4,5534020%
Madisonville, TX4,5464020%
Cobleskill, NY4,5543628%
Portola Valley, CA4,550484%
Source: The Portola Valley, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.