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Midwest faces dangerous risk of strong, long-track tornadoes into Monday night. See the timing. Chevron right
Following a nice start to the week, the Northeast will turn wet and chilly again. Get the forecast. Chevron right

O'Fallon, MO

68°F
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O'Fallon

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O'Fallon, MO Weather
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April 27 - May 11

Mon 4/27

79° /51°
96%
An a.m. t-shower in spots, windy; a few p.m. t-storms, some severe; there can be large and devastating tornadoes along with damaging winds and destructive hail
alerts

Flood Watch

11:18 AM Monday - 9:00 PM Monday

RealFeel®78°

RealFeel Shade™77°

Max UV Index2.0 (Low)

WindSSE 18 mph

Tue 4/28

65° /48°
55%
Cooler with sunshine mixing with some clouds; a thundershower in one or two spots in the afternoon

RealFeel®72°

RealFeel Shade™63°

Max UV Index9.0 (Very High)

WindNNE 7 mph

Wed 4/29

67° /38°
9%
Sunshine and a few clouds

RealFeel®69°

RealFeel Shade™63°

Max UV Index9.0 (Very High)

WindNNW 13 mph

Thu 4/30

65° /49°
11%
Times of clouds and sun

RealFeel®79°

RealFeel Shade™66°

Max UV Index9.0 (Very High)

WindNW 1 mph

Fri 5/1

59° /39°
18%
Cooler with times of clouds and sun; breezy in the afternoon

RealFeel®59°

RealFeel Shade™53°

Max UV Index5.0 (Moderate)

WindNW 13 mph

Sat 5/2

64° /43°
1%
Mostly sunny

RealFeel®73°

RealFeel Shade™63°

Max UV Index9.0 (Very High)

WindNW 7 mph

Sun 5/3

73° /48°
25%
Partly sunny

RealFeel®75°

RealFeel Shade™70°

Max UV Index9.0 (Very High)

WindSW 8 mph

Mon 5/4

73° /53°
80%
Variable cloudiness; heavy showers in the morning followed by a shower in the afternoon

RealFeel®75°

RealFeel Shade™71°

Max UV Index3.0 (Moderate)

WindW 6 mph

Tue 5/5

69° /48°
49%
Cloudy with a stray shower in the afternoon

RealFeel®68°

RealFeel Shade™66°

Max UV Index3.0 (Moderate)

WindW 7 mph

Wed 5/6

68° /49°
0%
Plenty of sunshine

RealFeel®74°

RealFeel Shade™66°

Max UV Index10.0 (Very High)

WindNW 6 mph

Thu 5/7

68° /46°
75%
Mostly cloudy; periods of rain in the morning followed by a shower in spots in the afternoon

RealFeel®68°

RealFeel Shade™64°

Max UV Index8.0 (Very High)

WindSW 16 mph

Fri 5/8

69° /50°
55%
Windy with considerable cloudiness; a little rain in the morning followed by a shower in spots in the afternoon

RealFeel®67°

RealFeel Shade™65°

Max UV Index2.0 (Low)

WindWNW 18 mph

Sat 5/9

67° /53°
2%
Intervals of clouds and sunshine

RealFeel®69°

RealFeel Shade™66°

Max UV Index4.0 (Moderate)

WindNW 10 mph

Sun 5/10

74° /52°
20%
Mostly sunny

RealFeel®82°

RealFeel Shade™73°

Max UV Index10.0 (Very High)

WindNE 4 mph

Mon 5/11

68° /56°
55%
Cloudy with a little rain

RealFeel®65°

RealFeel Shade™65°

Max UV Index2.0 (Low)

WindSSE 12 mph

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World North America United States Missouri O'Fallon

Weather Near O'Fallon:

  • St. Charles, MO
  • St. Louis, MO
  • St. Peters, MO
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