RealFeel® Sun 80°
RealFeel Shade™ 74°
Air Quality Fair
Wind NNE 2 mph
Wind Gusts 4 mph
Cloudy More Details
Current Air Quality
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 PollutantsMore Details
Learn more at
The risk of tree pollen symptoms is high. Keep your windows closed and change clothing after returning to the indoors.
The risk for ragweed pollen symptoms is high. Ensure your windows and doors are closed.
The risk of mold allergy symptoms is low.
The risk of grass pollen symptoms is high. Limit your time outdoors in the early morning and mid-afternoon hours.
Dust & Dander
The risk of dust and dander allergy symptoms is high. Be sure you're vacuuming with a HEPA-approved filter.
The risk of experiencing weather-related arthritis pain is moderate. Stay hydrated and stretch to help avoid arthritis symptoms.
The risk of weather-related sinus pressure is high. Taking a hot shower may help ease sinus pressure.
The risk of catching a cold is low.
The risk of catching the flu is low.
The risk of suffering from a weather-related migraine is low.
The risk of asthma symptoms is high. Be sure to use HEPA filters in your home to cut down on indoor asthma triggers.
Fishing conditions are good. Fishing in the early morning or dusk hours can help you get a catch.
Conditions for running are good. Be sure to wear sunscreen and UV-protective activewear.
Conditions for golfing are good. Wear sunscreen while out on the course.
Biking & Cycling
Conditions for cycling are good. Stay hydrated to make the most of your ride.
Beach & Pool
Conditions for a day at the beach or pool are good. Be sure to wear sunscreen and UV-protective clothing when spending time outdoors.
Conditions for stargazing are great. Invest in a red flashlight. It can help prevent additional light pollution.
Conditions for hiking are good. Stay hydrated and bring enough water to last the entire hike.
Conditions for lawn mowing are good. Alternating mowing patterns can help all areas of your lawn grow.
Composting conditions are great. Ensure any food scraps are covered with dry leaves or wood chips to help avoid attracting pests.
Conditions for outdoor entertaining will be good. Make sure you have shade available, so guests do not overheat.
Conditions for flying are ideal. Have a safe trip.
Conditions for driving are fair. Keep up with your car maintenance, such as inspecting your windshield wipers and checking your tire treads.
The risk for mosquito activity are high. Consider an EPA-registered repellent to deter mosquito bites.
The risk for pest activity is moderate. Do not leave food unattended and clear counters of crumbs.
The risk for pest activity is extremely high. Eliminate standing water in rain gutters, buckets, and in tires where pests can breed.
O'Fallon Weather Radar
See Interactive Map
See Interactive Map
Around the Globe
Radar & Maps
Top StoriesMore Stories
Featured TopicYour Local Asthma Forecast