St Louis Weather Conditions and Forecast, December 15, 2017

St Louis Weather Conditions, Forecast & Air Quality Index readings published by STL.News

ST LOUIS, MO/December 15, 2017 (STL.News) St Louis weather conditions & forecast readings from the St. Louis Lambert International Airport at 3:51 a.m at Latitude: 38.75°N, Longitude: 90.37°W – Elevation 604 feet.  Forecast is provided by the National Weather Service (N.W.S.).

Current Weather Conditions


Temperature: 31°F – 1°C
Humidity: 69%
Wind Speed: SW 10 mph
Barometer: 30.01 in (1020.3 MB)
Dew-point: 22°F – -6°C
Visibility: 10 Miles
Wind Chill: 22°F – -6°C
Heat Index: N/A°F – N/A°C

Extended Weather Forecast for the St Louis, Missouri area beginning December 15, 2017

Today: Mostly cloudy, becoming sunny – high near 43 with west wind 5 to 10 mph gusting as high as 20 mph.
Tonight: Mostly clear – low around 33 with southwest wind 6 to 9 mph.
Saturday: Sunny – high near 62 with southwest wind 7 to 14 mph.
Saturday Night: Increasing clouds – low around 39 with south wind 5 to 8 mph.
Sunday: Rain likely in the am, cloudy – high near 50 and south wind around 6 mph with a chance of precipitation – 70%.
Sunday Night: Mostly cloudy – low around 40.
Monday: Partly sunny – high near 57.
Monday Night: 20 percent chance of rain before midnight, partly cloudy – low around 39.
Tuesday: Sunny – high near 56.
Tuesday Night: Mostly clear – low around 33.
Wednesday: Sunny – high near 54.
Wednesday Night: Mostly clear – low around 39.
Thursday: Mostly sunny – high near 54.

Air Quality Index for Saint Louis, Missouri – (A.Q.I.)

Delayed Air Quality Index: 12/14/17 8:00 PM CST

  • Good – 36 AQI – Particle Pollution (2.5 microns)
  • Good – 19 AQI – Ozone
  • Good – 10 AQI – Particle Pollution (10 microns)

Agency: St. Louis Metropolitan Area (American Lung Association)

Air Quality Index (A.Q.I.)

Good – Air quality in considered “satisfactory” and air pollution poses little to no threat.

Moderate – Air quality is considered “acceptable.” However, some pollutants there may be a moderate health concern for a very small number of people who are sensitive to air pollution.

USG – while the general public will not likely be affected by this AQI range, people with lung disease, older adults and children are a great risk from exposure to ozone, whereas, persons with heart and lung disease, old adults and children are at greater risk from the presence of particles in the air.

Unhealthy – Everyone may begin to experience health effects members of sensitive groups may experience more serious health effects.

Very Unhealthy – Health Alert: everyone may experience more serious health effects.


Source: Current Weather Conditions and Forecast are obtained from the National Weather Service @ Forecast.Weather.Gov – Air Quality Index (AQI) readings are obtained from AirNow.Gov – (MS)


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