Today | Weather | Sunday, December 14, 2025
Active Weather Warnings

Weather in St. Louis, Missouri

07:21 AM
Now
Night
F
Feels Like -11°
Precipitation 0 %
Wind 13 mph
Humidity 65 %
Today
Cold Day
Day 16°
Night 12°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 2

St. Louis Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 14, 2024)
Stormy Weather

Day

48°

Night

43°

Wind

8 mph

Precipitation

90 %

Air Quality in St. Louis

NOW
39 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.08 µg/m³
PM10 1.22 µg/m³
O3 0.042 ppm
NO2 1 ppb
SO2 0.5 ppb
CO 0.12 ppm
NH3 0.56 µg/m³
NO 0 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.51.08 µg/m³
PM101.22 µg/m³
O382.61 µg/m³
NO21.81 µg/m³
SO21.23 µg/m³
CO136.75 µg/m³
NH30.56 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for St. Louis

Moderate Expected Likely

Cold Weather Advisory

Cold Weather Advisory issued December 14 at 3:29AM CST until December 14 at 12:00PM CST by NWS St Louis MO
Dec 14, 3:29 AM Dec 14, 12:00 PM
WHAT: Very cold wind chills between 10 and 20 below expected.

WHERE: In Illinois, Clinton IL, Washington IL, Monroe IL,
Randolph IL, and Saint Clair IL Counties. In Missouri, Lincoln MO,
Saint Charles MO, Saint Louis City MO, and Saint Louis MO Counties.

WHEN: Until noon CST today.

IMPACTS: The cold wind chills between 10 and 15 below zero could
result in hypothermia or frostbite if precautions are not taken.
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Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.
Updated: Dec 14, 6:14 AM Source: NWS Alert