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Key findings

  • The highest monthly average temperature in Southwest for August is 84 degrees
  • The lowest monthly average temperature in Southwest for January is 55 degrees
  • The most monthly precipitation in Southwest occurs in October with 10 inches
  • The air quality index in Southwest is 5% worse than the national average
  • The pollution index in Southwest is 86% better than the national average

Compare Houston, TX Weather

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      Southwest 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
      January47°F65°F55°F3.7"
      February49°F68°F57°F2.9"
      March56°F74°F64°F3.6"
      April62°F79°F70°F5.6"
      May70°F87°F77°F4.0"
      June75°F92°F83°F6.0"
      July76°F92°F83°F9.1"
      August77°F93°F84°F5.1"
      September73°F89°F80°F6.1"
      October64°F83°F72°F10.0"
      November55°F75°F64°F3.7"
      December47°F66°F56°F4.0"

      Southwest 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.
      IndexSouthwestHoustonTexas
      Air quality index525252
      Pollution index701,6522,906,8604,642,916

      Southwest air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality171
      Days with moderate air quality163
      Days w/ poor A.Q. for sensitive groups26
      Days with unhealthy air quality4

      Southwest air quality information

      PollutantTotal
      Arsenic0.003%
      Benzene0.040%
      Carbon Tetrachloride0.004%
      Lead0.001%
      Mercury0.002%

      Average monthly Southwest temperature with heat index

      Southwest monthly precipitation with daily maximum

      Southwest monthly snow depth with daily maximum

      Southwest monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Manvel, TX7,402524%
      New Territory, TX15,843524%
      Sienna Plantation, TX15,649524%
      Stafford, TX18,026524%
      Brookside Village, TX1,706524%
      Houston, TX2,240,582524%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Chicago, IL2,714,0175510%
      Philadelphia, PA1,559,938512%
      Phoenix, AZ1,555,3247448%
      San Antonio, TX1,439,358492%
      San Diego, CA1,374,8126428%
      Houston, TX2,240,582524%
      Source: The Southwest, Houston, TX 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.