TODAY AUG21
TEMPERATURE68
HUMIDITY57
PRESSURE29.88
WIND COND.250 16.1
  • 7555Tue
  • 7755Wed
  • 7655Thu
  • 7654Fri
  • 7654Sat
daynightWeather update from San Francisco, San Francisco International Airport at

Belmont 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
January44°F58°F51°F3.2"
February46°F62°F53°F3.4"
March47°F64°F54°F2.7"
April49°F67°F56°F1.7"
May51°F69°F58°F0.3"
June54°F72°F61°F0.2"
July56°F73°F62°F0.0"
August56°F73°F62°F0.0"
September56°F76°F63°F0.1"
October54°F73°F62°F1.0"
November49°F65°F56°F1.7"
December44°F58°F51°F4.4"

Did you know?

  • The highest monthly average temperature in Belmont for September is 63 degrees.
  • The lowest monthly average temperature in Belmont for January is 51 degrees.
  • The most monthly precipitation in Belmont occurs in December with 4.4 inches.
  • The air quality index in Belmont is 3% better than the national average.
  • The pollution index in Belmont is 90% worse than the national average.

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Compare Belmont, CA Weather To Other Cities

Belmont 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.
IndexBelmontCaliforniaNational
Air quality index485550
Pollution index9,645,61018,106,7265,066,862

Belmont 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

Belmont air quality information

PollutantTotal
Arsenic0.140%
Benzene0.070%
Carbon Tetrachloride0.000%
Lead0.100%
Mercury0.020%

Average monthly Belmont temperature with heat index

Belmont monthly precipitation with daily maximum

Belmont monthly snow depth with daily maximum

Belmont monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Castro Valley, CA62,8254314%
Daly City, CA105,5434314%
South San Francisco, CA66,5874314%
Brisbane, CA4,5684314%
San Leandro, CA89,0394314%
Belmont, CA26,918484%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Garden City, KS26,916688%
South Laurel, MD26,952492%
Leisure City, FL26,8614118%
Bessemer, AL26,85650= 100
Watertown, NY26,9973138%
Belmont, CA26,918484%
Source: The Belmont, 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.