TODAY MAY11
TEMPERATURE63
HUMIDITY93
PRESSURE30.05
WIND COND.300 7.6
  • 7355Tue20%60%
  • 6248Wed70%30%
  • 6448Thu40%30%
  • 7250Fri
  • 7654Sat
daynightWeather update from Atlanta, De Kalb-Peachtree Airport at

Key findings

  • The highest monthly average temperature in Alpharetta for July is 79.3 degrees
  • The lowest monthly average temperature in Alpharetta for January is 42.7 degrees
  • The most monthly precipitation in Alpharetta occurs in December with 5.1 inches
  • The air quality index in Alpharetta is 5% worse than the national average
  • The pollution index in Alpharetta is 167% worse than the national average

Compare Alpharetta, GA Weather

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      Alpharetta Average Temperature

      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
      January33°F54°F43°F4.1"
      February35°F57°F45°F4.0"
      March43°F67°F54°F4.2"
      April51°F75°F63°F4.1"
      May59°F82°F70°F3.8"
      June67°F90°F78°F3.6"
      July70°F91°F79°F3.9"
      August70°F90°F79°F4.7"
      September64°F84°F73°F4.6"
      October51°F75°F62°F3.4"
      November40°F65°F52°F3.5"
      December38°F58°F47°F5.1"

      Alpharetta 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.
      IndexAlpharettaGeorgiaNational
      Air quality index524150
      Pollution index13,513,5003,237,5535,066,862

      Alpharetta air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality162
      Days with moderate air quality184
      Days w/ poor A.Q. for sensitive groups18
      Days with unhealthy air quality1

      Alpharetta air quality information

      PollutantTotal
      Arsenic0.170%
      Benzene0.180%
      Carbon Tetrachloride0.040%
      Lead0.080%
      Mercury0.005%

      Average monthly Alpharetta temperature with heat index

      Alpharetta monthly precipitation with daily maximum

      Alpharetta monthly snow depth with daily maximum

      Alpharetta monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Cumming, GA5,7403726%
      Sugar Hill, GA20,8893726%
      Suwanee, GA18,0013726%
      Smyrna, GA54,788524%
      Johns Creek, GA82,930524%
      Alpharetta, GA63,013524%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Mansfield, TX63,141512%
      Cheyenne, WY62,8794314%
      West Hartford, CT63,1874118%
      Castro Valley, CA62,8254020%
      Bowling Green, KY62,8244314%
      Alpharetta, GA63,013524%
      Source: The Alpharetta, GA 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.