TODAY APR25
TEMPERATURE60
HUMIDITY37
PRESSURE102410
WIND COND.90 11.2
  • 6343Fri
  • 6350Sat30%20%
  • 8259Sun
  • 8662Mon
  • 8459Tue40%
daynightWeather update from Hagerstown, Washington County Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in San Mar for July is 76.1 degrees
  • The lowest monthly average temperature in San Mar for February is 30.3 degrees
  • The most monthly precipitation in San Mar occurs in August with 8.4 inches
  • The air quality index in San Mar is 5% better than the national average
  • The pollution index in San Mar is 495% worse than the national average

Compare San Mar, MD Weather

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      San Mar 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
      January27°F42°F34°F3.7"
      February22°F39°F30°F2.4"
      March31°F51°F40°F6.5"
      April41°F64°F52°F5.9"
      May50°F74°F62°F3.6"
      June62°F84°F73°F4.8"
      July65°F87°F76°F6.4"
      August66°F86°F75°F8.4"
      September58°F81°F70°F3.6"
      October50°F69°F59°F5.5"
      November36°F55°F45°F4.8"
      December26°F40°F33°F5.1"

      San Mar 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.
      IndexSan MarMarylandNational
      Air quality index404342
      Pollution index16,230,7005,342,3672,726,193

      San Mar air quality information

      MeasurementTotal
      Days measured362
      Days with good air quality306
      Days with moderate air quality54
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      San Mar air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.130%
      Carbon Tetrachloride0.090%
      Lead0.080%
      Mercury0.020%

      Average monthly San Mar temperature with heat index

      San Mar monthly precipitation with daily maximum

      San Mar monthly snow depth with daily maximum

      San Mar monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Frederick, MD71,8434020.0%
      Burkittsville, MD1674020.0%
      Garretts Mill, MD3504020.0%
      Rohrersville, MD2804020.0%
      Charlton, MD3804020.0%
      San Mar, MD3184020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Mountain Ranch, CA3183922.0%
      Red Cliff, CO318476.0%
      Redvale, CO3184412.0%
      Dupont, IN3183530.0%
      McCune, KS3183824.0%
      San Mar, MD3184020.0%
      Source: The San Mar, MD 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.