NimbocastO'Fallon, MO Weather
Live radar, hourly and 7-day forecast, and National Weather Service alerts for O'Fallon, Saint Charles County, Missouri.
Updated Jul 29, 2026, 3:46 PM local time · Radar refreshes every 5 minutes
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O'Fallon
87°F
Wind 8 mph
Humidity 41%
Cloud cover 1%
UV index 8
Alerts 0
Active alerts
✓
No active National Weather Service alerts for O'Fallon, MO.
O'Fallon weather radar
Light
Heavy
Next 24 hours
Now
☀️
86°F
4 PM
☀️
87°F
5 PM
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87°F
6 PM
☀️
86°F
7 PM
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84°F
8 PM
☀️
80°F
9 PM
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77°F
10 PM
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75°F
11 PM
☀️
74°F
12 AM
☀️
72°F
1 AM
☀️
71°F
2 AM
☀️
69°F
3 AM
☀️
68°F
4 AM
☀️
67°F
5 AM
☀️
66°F
6 AM
☀️
65°F
7 AM
☀️
66°F
8 AM
🌤️
71°F
9 AM
☁️
74°F
10 AM
☁️
79°F
11 AM
☀️
82°F
12 PM
☁️
85°F
1 PM
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87°F
2 PM
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88°F
7-day forecast
Today
Jul 29
☁️
87°F
71°F
1%
Thu
Jul 30
☁️
90°F
65°F
Fri
Jul 31
🌧️
87°F
71°F
74%
Sat
Aug 1
🌦️
72°F
66°F
74%
Sun
Aug 2
☁️
82°F
65°F
13%
Mon
Aug 3
☀️
83°F
61°F
10%
Tue
Aug 4
🌤️
89°F
63°F
9%
Weather near O'Fallon
4 mi
Saint Peters, MO8 mi
Wentzville, MO12 mi
Saint Charles, MO12 mi
Chesterfield, MO16 mi
Wildwood, MO16 mi
Maryland Heights, MO17 mi
Ballwin, MO18 mi
Hazelwood, MO
Alerts are relayed from the National Weather Service and may lag
the official source. In a life-threatening situation always follow
weather.gov and local emergency
broadcasts.