TODAY DEC22
TEMPERATURE61
HUMIDITY32
PRESSURE102570
WIND COND.360 7.6
  • 6649Mon
  • 7156Tue
  • 745940%
  • 7462Thu40%
  • 7461Fri40%20%
daynightWeather update from Lafayette, Lafayette Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Mermentau for July is 81.7 degrees
  • The lowest monthly average temperature in Mermentau for January is 53.5 degrees
  • The most monthly precipitation in Mermentau occurs in August with 24.8 inches
  • The air quality index in Mermentau is 3% better than the national average
  • The pollution index in Mermentau is 57% better than the national average

Compare Mermentau, LA Weather

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      Mermentau 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
      January44°F66°F54°F0.3"
      February48°F71°F59°F8.8"
      March56°F75°F65°F5.9"
      April60°F79°F69°F1.3"
      May64°F82°F73°F10.3"
      June71°F89°F79°F10.1"
      July73°F93°F82°F9.8"
      August71°F92°F80°F24.8"
      September69°F89°F77°F5.3"
      October58°F83°F70°F6.9"
      November51°F75°F62°F1.0"
      December46°F68°F56°F4.6"

      Mermentau 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.
      IndexMermentauLouisianaNational
      Air quality index4110642
      Pollution index1,171,5802,526,4752,726,193

      Mermentau air quality

      MeasurementTotal
      Days measured365
      Days with good air quality280
      Days with moderate air quality85
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.000%
      Benzene0.020%
      Carbon Tetrachloride0.002%
      Lead0.004%
      Mercury0.000%

      Average monthly Mermentau temperature with heat index

      Mermentau monthly precipitation with daily maximum

      Mermentau monthly snow depth with daily maximum

      Mermentau monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Gueydan, LA1,1844118.0%
      Crowley, LA12,6894118.0%
      Egan, LA1,0024118.0%
      Iota, LA1,7524118.0%
      Estherwood, LA6764118.0%
      Mermentau, LA6164118.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Shipman, IL616548.0%
      Killona, LA6164118.0%
      Parma, MO6162648.0%
      Sherman, MS6163922.0%
      Newton Grove, NC6164020.0%
      Mermentau, LA6164118.0%
      Source: The Mermentau, LA 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.