10-day forecast

Today Clear 1% 52° 87° Today · UV 5 · Wind 7 mph · ☀ 7:07 AM – 6:35 PM
Sat 10 Mostly cloudy 1% 58° 80° Saturday, October 10 · UV 3 · Wind 7 mph · ☀ 7:08 AM – 6:33 PM
Sun 11 Clear 0% 58° 81° Sunday, October 11 · UV 5 · Wind 2 mph · ☀ 7:09 AM – 6:32 PM
Mon 12 Clear 0% 62° 91° Monday, October 12 · UV 5 · Wind 9 mph · ☀ 7:10 AM – 6:30 PM
Tue 13 Drizzle 15% 68° 84° Tuesday, October 13 · UV 4 · Wind 9 mph · ☀ 7:11 AM – 6:29 PM
Wed 14 Showers 65% 63° 81° Wednesday, October 14 · UV 0 · Wind 9 mph · ☀ 7:12 AM – 6:27 PM
Thu 15 Showers 65% 63° 80° Thursday, October 15 · UV 3 · Wind 11 mph · ☀ 7:13 AM – 6:26 PM
Fri 16 Mostly cloudy 0% 51° 68° Friday, October 16 · UV 2 · Wind 13 mph · ☀ 7:14 AM – 6:24 PM
Sat 17 Mostly clear 0% 46° 62° Saturday, October 17 · UV 3 · Wind 9 mph · ☀ 7:15 AM – 6:23 PM
Sun 18 Mostly clear 0% 45° 65° Sunday, October 18 · UV 3 · Wind 4 mph · ☀ 7:16 AM – 6:22 PM

14-day outlook & extended hourly ★ Premium

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About O'Fallon weather

O'Fallon is in Saint Charles County, Missouri, United States at 38.81°, -90.70°. Right now it’s 57° and clear; today’s high is 87° with a 1% chance of rain.

Missouri has a humid continental climate in the north and a humid subtropical climate in the south, placing it at the convergence of multiple weather influences. The state's central location means it receives weather from every direction — Arctic cold from Canada, Gulf moisture from the south, and dry air from the west. This produces highly variable weather and the common saying among Missourians to wait five minutes if you don't like the weather.