TEST MODE
Now accepting affiliate applications in hundreds of markets across the country. Run your town's Community Observer and earn up to 75% of the ad revenue. See how it worksO'Fallon does not have an affiliate yet. Be the one. Apply for O'FallonTest mode: games, boards and entries really work, prizes and payments are not real. Open the Test Lab and tell us what to keep.
O'FallonCommunity Observer

Monday, November 2 · updated 6 hr ago

O'Fallon

Missouri

66°
Mostly CloudyHigh 69°  ·  Low 63°
Wind14 mph S
Chance of rain7%
Tonight63° Mostly Cloudy
Photo: Wikimedia Commons

Next 12 hours

Hour by hour from the National Weather Service

Now
66°
12pm
68°
1pm
68°
2pm
68°
3pm
68°
4pm
68°
5pm
68°
6pm
66°
7pm
65°
8pm
63°
9pm
64°
10pm
64°

7 day forecast

Highs and lows for the week

TodayMostly Cloudy7%63°
69°
TueRain100%52°
73°
WedMostly Sunny4%45°
66°
ThuMostly Sunny4%44°
66°
FriMostly Sunny1%40°
61°
SatMostly Sunny2%40°
62°
SunSlight Chance Light Rain22%40°
62°

Live radar and maps

Radar map by Windy

Open this forecast on weather.gov

Plan your day in O'Fallon

🛣️ Roads and trafficLive traffic map and closures🎉 Things to doWhat is happening this week📺 Local TV weatherYour station forecasts and live radio✈️ GetawaysTours and travel deals🏟 Game dayScores and schedules

For a nice day outside

Picked for today's weather in O'Fallon.

🛒Shop For a nice day outside on AmazonSee what is popular →

As an Amazon Associate, community.observer earns from qualifying purchases. Prices and availability are shown as of the time they were last checked and can change.

Cheap flights from St. Louis

Fares from the nearest big airport.

Loading Cheap flights from St. Louis...

Travel deals come from our partner Travelpayouts. If you book through them, community.observer may earn a commission at no extra cost to you.

Forecast in detail

Today, 69°. Mostly cloudy, with a high near 69. South wind around 14 mph, with gusts as high as 24 mph.

Tonight, 63°. Mostly cloudy, with a low around 63. South wind 12 to 16 mph, with gusts as high as 26 mph.

Tuesday, 73°. A chance of rain between 7am and 9am, then rain and a slight chance of thunderstorms. Mostly cloudy. High near 73, with temperatures falling to around 69 in the afternoon. South wind 13 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%.

Tuesday Night, 52°. Rain and a slight chance of thunderstorms before midnight. Mostly cloudy, with a low around 52. Southwest wind 7 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.

Wednesday, 66°. Mostly sunny. High near 66, with temperatures falling to around 62 in the afternoon. West wind 6 to 12 mph.

Wednesday Night, 45°. Mostly clear, with a low around 45.

Thursday, 66°. Mostly sunny, with a high near 66.

Thursday Night, 44°. Partly cloudy, with a low around 44.

Friday, 61°. Mostly sunny, with a high near 61.

Friday Night, 40°. Partly cloudy, with a low around 40.