TODAY DEC18
TEMPERATURE31
HUMIDITY43
PRESSURE29.98
WIND COND.
  • 4131Wed
  • 4644Thu60%
  • 5946Fri90%80%
  • 4933Sat
  • 4232Sun
daynightWeather update from Islip, Long Island Mac Arthur Airport at

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

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Compare Port Jefferson, NY Weather To Other Cities

Port Jefferson 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.
IndexPort JeffersonNew YorkNational
Air quality index474350
Pollution index39,208,8009,373,0575,066,862

Port Jefferson 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

Port Jefferson air quality information

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

Average monthly Port Jefferson temperature with heat index

Port Jefferson monthly precipitation with daily maximum

Port Jefferson monthly snow depth with daily maximum

Port Jefferson monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Bay Shore, NY29,704476%
Blue Point, NY4,581476%
Commack, NY36,625476%
East Islip, NY13,853476%
Elwood, NY11,197476%
Port Jefferson, NY7,795476%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Grand Ledge, MI7,7943432%
Lexington, TN7,796335570%
Sheboygan Falls, WI7,7923922%
Pike Road, AL7,7903726%
Citrus Hills, FL7,7902452%
Port Jefferson, NY7,795476%
Source: The Port Jefferson, 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.