Today carries a thunderstorm chance.
- Rain
- 88%
- Humidity
- 79–100%
- Wind
- 23 mph
Current concerns
Outdoor planning
Now
- 76°Chance Showers And Thunderstorms54% rain85% humidityGusts 14 mph
- 78°Chance Showers And Thunderstorms42% rain82% humidityGusts 15 mph
- 79°Chance Showers And Thunderstorms38% rain79% humidityGusts 16 mph
- 79°Chance Showers And Thunderstorms35% rain79% humidityGusts 17 mph
- 79°Chance Showers And Thunderstorms35% rain82% humidityGusts 18 mph
- 78°Chance Showers And Thunderstorms45% rain82% humidityGusts 18 mph
- 77°Chance Showers And Thunderstorms45% rain82% humidityGusts 20 mph
- 74°Scattered Showers And Thunderstorms46% rain87% humidityGusts 18 mph
- 72°Chance Showers And Thunderstorms57% rain90% humidityGusts 20 mph
- 69°Chance Showers And Thunderstorms69% rain93% humidityGusts 22 mph
- 66°Scattered Rain Showers51% rain100% humidityGusts 23 mph
- 63°Scattered Rain Showers53% rain97% humidityGusts 23 mph
- 59°Scattered Rain Showers54% rain100% humidityGusts 23 mph
- 56°Isolated Rain Showers17% rain100% humidityGusts 23 mph
- 55°Cloudy2% rain96% humidityGusts 23 mph
- 54°Cloudy1% rain93% humidityGusts 22 mph
- 52°Mostly Cloudy0% rain93% humidityGusts 22 mph
- 50°Mostly Cloudy0% rain93% humidityGusts 24 mph
- 49°Mostly Cloudy0% rain89% humidityGusts 25 mph
- 47°Partly Sunny0% rain89% humidityGusts 26 mph
- 47°Mostly Sunny0% rain89% humidityGusts 28 mph
- 49°Mostly Sunny0% rain86% humidityGusts 28 mph
- 51°Partly Sunny0% rain80% humidityGusts 28 mph
- 53°Partly Sunny0% rain77% humidityGusts 29 mph
A little farther out
The next five days
Friday has a real shower chance.
- Rain
- 54%
- Humidity
- 72–100%
- Wind
- 29 mph
Saturday looks fairly quiet.
- Rain
- 4%
- Humidity
- 45–96%
- Wind
- 16 mph
Sunday looks fairly quiet.
- Rain
- 0%
- Humidity
- 40–89%
- Wind
- 9 mph
Monday looks fairly quiet.
- Rain
- 0%
- Humidity
- 43–93%
- Wind
- 6 mph
- 79° / 63°Today carries a thunderstorm chance.88% rain · Humidity 79–100% · Wind 23 mph
- 59° / 47°Friday has a real shower chance.54% rain · Humidity 72–100% · Wind 29 mph
- 59° / 39°Saturday looks fairly quiet.4% rain · Humidity 45–96% · Wind 16 mph
- 66° / 38°Sunday looks fairly quiet.0% rain · Humidity 40–89% · Wind 9 mph
- 72° / 41°Monday looks fairly quiet.0% rain · Humidity 43–93% · Wind 6 mph
Environmental watch
Air quality + smoke
Air quality
Saint Louis area · Updated Thu 11:26 AMNo fresh outlook yet.
62 is in the Moderate range (51–100). Most people can be active outside; if you’re unusually sensitive to fine particles, consider a shorter or easier outing.
Sky check
No plume detected overhead
Satellite view · Updated Thu 7:45 AMAir near ground62 · Moderate US AQI
Rain, in motion · Past four hours
O'Fallon radar
Radar animation for O'Fallon, covering the past four hours. A marked spot changes the map view, not the forecast on this page.
Outdoor fire check
Thinking about a backyard fire?
Use extra caution.
There is no lower-concern three-hour stretch in the next 12 hours.
Next 12 hoursChoose a time to see what is driving the concern.
Check local rules. Weather is only part of the decision. Check city, county, and land-manager fire restrictions before lighting any outdoor fire.
Nearby regional view
Explore St. Louis
About 20 miles away, the St. Louis hub looks more deeply at St. Louis, MO-IL. It reflects that wider area rather than O'Fallon’s exact conditions.
About these readingsSources and local limits
Weather
Forecasts, alerts, and radar come from NOAA and the National Weather Service.
Air quality
This reading describes Saint Louis area, about 10 miles away. Conditions can differ at this exact spot.
Smoke
Satellite imagery shows smoke overhead. It cannot tell us how much smoke has reached breathing level.
This page represents O'Fallon, MO, so conditions can vary from street to street. Environmental data: AirNow · participating air agencies · preliminary real-time US AQI · NOAA Hazard Mapping System · satellite-observed smoke.