TODAY FEB25
TEMPERATURE35
HUMIDITY80
PRESSURE30.23
WIND COND.
  • 4126Thu
  • 4935Fri40%
  • 5737Sat
  • 5127Sun
  • 4324Mon
daynightWeather update from Logan County Airport at

Key findings

  • The highest monthly average temperature in San Jose for July is 76 degrees
  • The lowest monthly average temperature in San Jose for January is 28 degrees
  • The most monthly precipitation in San Jose occurs in September with 11.5 inches
  • The air quality index in San Jose is 18% better than the national average
  • The pollution index in San Jose is 75% better than the national average

Compare San Jose, IL Weather

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      San Jose 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
      January20°F37°F28°F2.6"
      February21°F39°F29°F3.2"
      March34°F55°F43°F4.1"
      April44°F67°F55°F6.7"
      May54°F76°F65°F4.6"
      June63°F85°F74°F8.5"
      July66°F87°F76°F11.2"
      August64°F86°F74°F8.1"
      September56°F80°F67°F11.5"
      October46°F68°F56°F6.3"
      November34°F54°F43°F5.1"
      December25°F40°F32°F5.3"

      San Jose 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 JoseIllinoisNational
      Air quality index414150
      Pollution index1,277,8903,347,2955,066,862

      San Jose air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality285
      Days with moderate air quality78
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      San Jose air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.050%
      Carbon Tetrachloride0.000%
      Lead0.010%
      Mercury0.002%

      Average monthly San Jose temperature with heat index

      San Jose monthly precipitation with daily maximum

      San Jose monthly snow depth with daily maximum

      San Jose monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      New Holland, IL1874020%
      Lincoln, IL14,2534020%
      Easton, IL3764020%
      Mason City, IL2,2724020%
      Middletown, IL3234020%
      San Jose, IL6454118%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Stratford, IA6453726%
      South Webster, OH6451472%
      Cordova, IL6454216%
      Greenville, IN645492%
      York Haven, PA6454118%
      San Jose, IL6454118%
      Source: The San Jose, IL 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.