TODAY FEB27
TEMPERATURE42
HUMIDITY100
PRESSURE29.92
WIND COND.220 13
  • 6145Sat30%
  • 5628Sun
  • 5027Mon
  • 4933Tue20%
  • 5636Wed
daynightWeather update from St. Louis Regional Airport at

Key findings

  • The highest monthly average temperature in Bethalto for July is 77 degrees
  • The lowest monthly average temperature in Bethalto for January is 31 degrees
  • The most monthly precipitation in Bethalto occurs in July with 7.3 inches
  • The air quality index in Bethalto is 9% worse than the national average
  • The pollution index in Bethalto is 67% worse than the national average

Compare Bethalto, IL Weather

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      Bethalto 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°F31°F3.4"
      February25°F43°F33°F3.7"
      March38°F57°F46°F3.1"
      April47°F68°F56°F6.6"
      May56°F76°F65°F6.1"
      June65°F85°F75°F3.5"
      July67°F87°F77°F7.3"
      August66°F86°F75°F6.8"
      September58°F80°F68°F4.4"
      October47°F68°F57°F6.7"
      November36°F56°F45°F4.9"
      December28°F43°F35°F6.3"

      Bethalto 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.
      IndexBethaltoIllinoisNational
      Air quality index544150
      Pollution index8,473,0503,347,2955,066,862

      Bethalto air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality134
      Days with moderate air quality221
      Days w/ poor A.Q. for sensitive groups8
      Days with unhealthy air quality2

      Bethalto air quality information

      PollutantTotal
      Arsenic0.020%
      Benzene0.070%
      Carbon Tetrachloride0.020%
      Lead0.010%
      Mercury0.010%

      Average monthly Bethalto temperature with heat index

      Bethalto monthly precipitation with daily maximum

      Bethalto monthly snow depth with daily maximum

      Bethalto monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Godfrey, IL17,809548%
      Mount Clare, IL237548%
      Worden, IL1,192548%
      Alton, IL27,175548%
      Hamel, IL1,015548%
      Bethalto, IL9,364548%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Lamesa, TX9,3672550%
      Bohemia, NY9,3724314%
      Merrill, WI9,3543432%
      Mount Airy, MD9,376468%
      North College Hill, OH9,351548%
      Bethalto, IL9,364548%
      Source: The Bethalto, 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.