Hourly Weather Forecast for O'Fallon, Missouri 63366 - The Weather Channel | weather.com

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Hourly WeatherO'Fallon, Missouri 63366 · as of 6:42 PM UTC

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On The Move

And The Best State For An Adventure Vacation Is ...

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California Wildflower Superblooms Are Back In 2026

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3 Big Changes Coming To National Parks In 2026

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‘Rare And Remarkable’: Lake Superior Ice Caves Reopen

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New March Heat Record: Where It Hit 110

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Historic Heat Wave: National Heat Record Broken, More Heat Ahead

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We Love Our Critters

Australian Rhino Gets Ready For Summer With A Spa Day

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Why Frogs Croak Faster In Warm Water: A Survival Strategy

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Retreat! Penguins’ Instant Regret After Jumping On Ice Floe

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Newly Identified Tick-Borne Bacterium In US Dogs

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Spring Is Here

Leaves Increasing On Trees In The South, Pollen On The Rise

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When Are The Average Last Freezes In The US?

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Allergy Season Grows Longer – Especially In These Places

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Record Warmth Is Almost Tripling Record Cold This Year

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Home & Garden

Don’t Make These Mistakes When Planting Your Spring Garden

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When To Worry About Mold Growing In Your Home

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Get Ahead For Spring With Essential Winter Garden Tips

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Why Your Home's Air Might Be More Polluted Than Outdoors

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Editor's Pick

Meteorite Hunters Find Fragments Of Ohio Fireball

Meteorite hunters hopped on flights and drove hours across the country after seeing that stunning meteor streak across the sky over Ohio. They looked at radar locations to figure out where to start their hunt, and now they are showing off some of their finds. They’ll have to be confirmed by the American Meteor Society, but see why these hunters are so passionate about this pursuit.

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Sun & Moon

Watch: Meteorite Hunters Find Fragments Of Ohio Fireball

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Stay Safe

Dangerous Heat Threshold: Study Reveals 85-Degree Heat Index Triggers Sharp Rise In Workplace Injuries

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