TODAY JUN24
TEMPERATURE54
HUMIDITY93
PRESSURE30.34
WIND COND.
  • 7860Thu30%
  • 8065Fri30%
  • 8369Sat
  • 8569Sun
  • 8770Mon
daynightWeather update from Islip, Long Island Mac Arthur Airport at

Key findings

  • The highest monthly average temperature in Smithtown for July is 75.9 degrees
  • The lowest monthly average temperature in Smithtown for January is 32.3 degrees
  • The most monthly precipitation in Smithtown occurs in August with 5.6 inches
  • The air quality index in Smithtown is 14% better than the national average
  • The pollution index in Smithtown is 674% worse than the national average

Compare Smithtown, NY Weather

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      Smithtown 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
      January24°F41°F32°F4.0"
      February24°F43°F33°F3.0"
      March31°F50°F40°F4.2"
      April41°F61°F50°F3.5"
      May51°F71°F60°F3.6"
      June60°F79°F69°F4.7"
      July68°F85°F76°F3.1"
      August65°F83°F74°F5.6"
      September60°F78°F68°F3.1"
      October49°F67°F58°F4.1"
      November37°F56°F46°F3.0"
      December31°F47°F39°F4.9"

      Smithtown 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.
      IndexSmithtownNew YorkNational
      Air quality index434350
      Pollution index39,208,8009,373,0575,066,862

      Smithtown air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality262
      Days with moderate air quality82
      Days w/ poor A.Q. for sensitive groups18
      Days with unhealthy air quality3

      Smithtown air quality information

      PollutantTotal
      Arsenic0.060%
      Benzene0.320%
      Carbon Tetrachloride0.020%
      Lead0.320%
      Mercury0.130%

      Average monthly Smithtown temperature with heat index

      Smithtown monthly precipitation with daily maximum

      Smithtown monthly snow depth with daily maximum

      Smithtown monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      South Huntington, NY9,5084314%
      Baywood, NY7,4154314%
      Fire Island, NY2684314%
      Oakdale, NY7,4054314%
      West Sayville, NY4,8754314%
      Smithtown, NY26,1624314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Shoreview, MN26,161468%
      East Lake-Orient Park, FL26,1604314%
      University Park, FL26,1504118%
      Clinton, IA26,1484216%
      Kingsville, TX26,1773040%
      Smithtown, NY26,1624314%
      Source: The Smithtown, NY 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.