TODAY JUL21
TEMPERATURE93
HUMIDITY52
PRESSURE29.91
WIND COND.300 12.8
  • 9169Mon30%80%
  • 8065Tue70%30%
  • 8365Wed
  • 8567Thu
  • 8769Fri
daynightWeather update from Washington/Reagan National Airport, DC at
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South West 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
January28°F47°F37°F2.7"
February29°F50°F38°F2.3"
March37°F60°F47°F3.2"
April47°F71°F58°F3.4"
May56°F78°F67°F4.6"
June67°F87°F77°F5.3"
July72°F91°F81°F4.2"
August70°F90°F79°F3.2"
September63°F83°F72°F3.5"
October52°F72°F61°F5.0"
November40°F61°F50°F2.5"
December33°F52°F42°F3.8"

Did you know?

  • The highest monthly average temperature in South West for July is 81 degrees.
  • The lowest monthly average temperature in South West for January is 37 degrees.
  • The most monthly precipitation in South West occurs in June with 5.3 inches.
  • The air quality index in South West is 1% better than the national average.
  • The pollution index in South West is 69% better than the national average.

Compare Washington, DC Weather To Other Cities

South West 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.
IndexSouth WestWashingtonDistrict of Columbia
Air quality index494949
Pollution index1,590,9705,554,0105,554,010

South West air quality information

MeasurementTotal
Days measured365
Days with good air quality194
Days with moderate air quality166
Days w/ poor A.Q. for sensitive groups5
Days with unhealthy air quality

South West air quality information

PollutantTotal
Arsenic0.010%
Benzene0.060%
Carbon Tetrachloride0.010%
Lead0.004%
Mercury0.010%

Average monthly South West temperature with heat index

South West monthly precipitation with daily maximum

South West monthly snow depth with daily maximum

South West monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Lake Arbor, MD10,380492%
Lanham, MD10,219492%
Marlow Heights, MD5,755492%
Mitchellville, MD10,900492%
New Carrollton, MD12,727492%
Washington, DC659,009492%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Boston, MA658,279476%
Memphis, TN655,8574412%
Denver, CO663,303548%
Seattle, WA668,849492%
Nashville, TN643,7714510%
Washington, DC659,009492%
Source: The South West, Washington, DC 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.
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