TODAY SEP21
TEMPERATURE71
HUMIDITY63
PRESSURE30.25
WIND COND.120 12.8
  • 7356Sat
  • 7154Sun
  • 6858Mon
  • 7166Tue30%50%
  • 7863Wed40%40%
daynightWeather update from Islip, Long Island Mac Arthur Airport at
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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"

Did you know?

  • The highest monthly average temperature in Smithtown for July is 76 degrees.
  • The lowest monthly average temperature in Smithtown for January is 32 degrees.
  • The most monthly precipitation in Smithtown occurs in August with 5.6 inches.
  • The air quality index in Smithtown is 5% better than the national average.
  • The pollution index in Smithtown is 673% worse than the national average.

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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 index474350
Pollution index39,208,8009,373,0575,066,862

Smithtown air quality information

MeasurementTotal
Days measured365
Days with good air quality200
Days with moderate air quality146
Days w/ poor A.Q. for sensitive groups18
Days with unhealthy air quality1

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.
St. James, NY13,512476%
Setauket-East Setauket, NY14,174476%
Stony Brook, NY13,437476%
Village of the Branch, NY1,961476%
West Hills, NY5,163476%
Smithtown, NY26,162476%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Shoreview, MN26,1614412%
East Lake-Orient Park, FL26,1604314%
University Park, FL26,1504118%
Clinton, IA26,148536%
Kingsville, TX26,1773138%
Smithtown, NY26,162476%
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.