TODAY NOV09
TEMPERATURE77
HUMIDITY78
PRESSURE101690
WIND COND.
  • 8473Sat20%20%
  • 8472Sun20%20%
  • 857230%40%
  • 8572Tue
  • 8370Wed
daynightWeather update from Titusville at
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Weather Quick Facts

  • The highest monthly average temperature in Port St. John for August is 82.4 degrees
  • The lowest monthly average temperature in Port St. John for February is 60.8 degrees
  • The most monthly precipitation in Port St. John occurs in October with 16.9 inches
  • The air quality index in Port St. John is 7% better than the national average
  • The pollution index in Port St. John is 513% worse than the national average

Compare Port St. John, FL Weather

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      Port St. John 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
      January55°F71°F63°F4.8"
      February52°F70°F61°F4.2"
      March57°F74°F65°F6.2"
      April60°F77°F68°F5.0"
      May66°F81°F74°F6.6"
      June72°F86°F79°F9.1"
      July75°F89°F81°F9.2"
      August75°F90°F82°F5.0"
      September74°F86°F79°F13.1"
      October70°F81°F75°F16.9"
      November60°F75°F67°F2.2"
      December55°F71°F62°F4.6"

      Port St. John 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 St. JohnFloridaNational
      Air quality index393542
      Pollution index16,722,7007,570,7852,726,193

      Port St. John air quality

      MeasurementTotal
      Days measured365
      Days with good air quality296
      Days with moderate air quality63
      Days w/ poor A.Q. for sensitive groups6
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.050%
      Benzene0.210%
      Carbon Tetrachloride0.030%
      Lead0.190%
      Mercury0.010%

      Average monthly Port St. John temperature with heat index

      Port St. John monthly precipitation with daily maximum

      Port St. John monthly snow depth with daily maximum

      Port St. John monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Cape Canaveral, FL10,4113628.0%
      Merritt Island, FL33,9753628.0%
      Viera West, FL14,2043628.0%
      Cocoa, FL20,1513628.0%
      Rockledge, FL27,7393628.0%
      Port St. John, FL23,9403922.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Ponca City, OK23,9404020.0%
      Kalispell, MT23,9353726.0%
      Freeport, IL23,9304216.0%
      South Plainfield, NJ23,961512.0%
      Saint-Lin--Laurentides, QC23,910n/a 
      Port St. John, FL23,9403922.0%
      Source: The Port St. John, FL 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.