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St. Louis, MO Weather
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Today

 Hourly Daily Radar MinuteCast Monthly Air Quality Health & Activities

Current Weather

12:23 PM

72°F
RealFeel® 79°
RealFeel Shade™ 73°
Air Quality Fair
Wind WSW 3 mph
Wind Gusts 10 mph
Cloudy More Details

Current Air Quality

Today

5/18

23
AQI

Fair

The air quality is generally acceptable for most individuals. However, sensitive groups may experience minor to moderate symptoms from long-term exposure.

Based on Current Pollutants

More Details

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Current Air Quality

Our current air quality index (AQI) provides information on the quality of air that you are breathing and its impact on your health. There are at least six different pollutants that we track that impact the cleanliness of air and your health.

Health & Activities
See all
Tree Pollen
High
The risk of tree pollen symptoms is high. Keep your windows closed and change clothing after returning to the indoors.
Ragweed Pollen
Low
The risk for ragweed pollen symptoms is low.
Mold
High
The risk of mold allergy symptoms is high. Remove your shoes as soon as you return inside.
Grass Pollen
Low
The risk of grass pollen symptoms is low.
Dust & Dander
Moderate
The risk of dust and dander allergy symptoms is moderate. Closing your windows on windy days can help prevent outside dust or dander from getting into your home.
Arthritis
High
The risk of experiencing weather-related arthritis pain is high. Focus on low-impact aerobic exercises.
Sinus Pressure
Moderate
The risk of weather-related sinus pressure is moderate. Make sure you stay hydrated.
Common Cold
Low
The risk of catching a cold is low.
Flu
Low
The risk of catching the flu is low.
Migraine
Low
The risk of suffering from a weather-related migraine is low.
Asthma
Very High
The risk of asthma is very high. Use a humidifier to prevent dry air in your home.
Fishing
Fair
Fishing conditions are fair.
Running
Fair
Conditions for running are fair. Stay hydrated to make your run easier.
Golf
Fair
Conditions for golfing are fair. Be prepared for 'invisible hazards' like wind that can make the game more challenging.
Biking & Cycling
Good
Conditions for cycling are good. Stay hydrated to make the most of your ride.
Beach & Pool
Good
Conditions for a day at the beach or pool are good. Be sure to wear sunscreen and UV-protective clothing when spending time outdoors.
Stargazing
Poor
Conditions for stargazing are poor.
Hiking
Fair
Conditions for hiking are fair. Wear the right gear and watch for slippery surfaces.
Lawn Mowing
Fair
Conditions for lawn mowing are fair. Be sure only to cut off 1/3 of the total height of your grass when mowing.
Composting
Good
Composting conditions are good. Make sure you frequently add water to your compost to keep it moist.
Outdoor Entertaining
Great
Conditions for outdoor entertaining will be great. Pay attention to the mosquito or pest forecast and prepare deterrents.
Air Travel
Ideal
Conditions for flying are ideal. Have a safe trip.
Driving
Good
Conditions for driving are good. Stay alert of any changes to the weather forecast.
Mosquitos
Moderate
The risk for mosquito activity are moderate. Eliminate any standing water on your property where mosquitoes can breed.
Indoor Pests
Moderate
The risk for pest activity is moderate. Do not leave food unattended and clear counters of crumbs.
Outdoor Pests
High
The risk for pest activity is high. Replacing outdoor lights with yellow bug lights can attract less insects.
See all

TODAY’S WEATHER FORECAST

5/18
84°Hi
RealFeel® 87°
Rain and a thunderstorm

TONIGHT’S WEATHER FORECAST

5/18
63°Lo
RealFeel® 64°
A thunderstorm in spots

TOMORROW’S WEATHER FORECAST

5/19
88°/ 74°
RealFeel® 93°
A stray t-storm; very warm

Looking Ahead

Thunderstorms, some strong, Friday evening through Saturday afternoon; storms can be severe

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  • O'Fallon, MO ;
  • Springfield, IL ;
  • St. Charles, MO
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