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Midwest warmup arrives but spring struggles to take hold in the Northeast. See the forecast. Chevron right

O'Fallon, MO

56°F
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O'Fallon

Missouri

56°
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O'Fallon, MO Weather
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April 21 - May 5

Tue 4/21

82° /55°
4%
Mostly sunny, breezy and warmer

RealFeel®81°

RealFeel Shade™78°

Max UV Index8.0 (Very High)

WindSW 14 mph

Wed 4/22

79° /56°
6%
Sunny to partly cloudy, nice and warm

RealFeel®82°

RealFeel Shade™76°

Max UV Index8.0 (Very High)

WindWSW 9 mph

Thu 4/23

84° /63°
25%
Partly sunny, breezy and very warm

RealFeel®85°

RealFeel Shade™80°

Max UV Index9.0 (Very High)

WindS 14 mph

Fri 4/24

72° /51°
88%
Breezy in the morning; cloudy and not as warm with a couple of showers and a thunderstorm

RealFeel®72°

RealFeel Shade™69°

Max UV Index2.0 (Low)

WindSSW 13 mph

Sat 4/25

74° /51°
22%
Pleasant and less humid with partial sunshine

RealFeel®76°

RealFeel Shade™71°

Max UV Index9.0 (Very High)

WindNE 10 mph

Sun 4/26

73° /58°
88%
Cloudy with a couple of showers and a thunderstorm

RealFeel®71°

RealFeel Shade™69°

Max UV Index3.0 (Moderate)

WindESE 12 mph

Mon 4/27

71° /48°
55%
Watch for a strong morning thunderstorm; mostly cloudy and humid

RealFeel®71°

RealFeel Shade™68°

Max UV Index5.0 (Moderate)

WindSW 15 mph

Tue 4/28

65° /49°
49%
A shower in spots in the morning; otherwise, cloudy most of the time

RealFeel®63°

RealFeel Shade™63°

Max UV Index3.0 (Moderate)

WindWNW 13 mph

Wed 4/29

68° /48°
2%
Turning cloudy

RealFeel®76°

RealFeel Shade™66°

Max UV Index9.0 (Very High)

WindNW 6 mph

Thu 4/30

65° /45°
2%
Mostly cloudy

RealFeel®64°

RealFeel Shade™62°

Max UV Index4.0 (Moderate)

WindNW 9 mph

Fri 5/1

66° /47°
9%
Sunny to partly cloudy

RealFeel®69°

RealFeel Shade™63°

Max UV Index9.0 (Very High)

WindSW 8 mph

Sat 5/2

67° /47°
49%
Occasional morning rain; otherwise, cloudy

RealFeel®66°

RealFeel Shade™64°

Max UV Index3.0 (Moderate)

WindNNW 10 mph

Sun 5/3

69° /46°
49%
A stray shower in the morning; otherwise, clouds and sunshine

RealFeel®69°

RealFeel Shade™66°

Max UV Index4.0 (Moderate)

WindNNW 8 mph

Mon 5/4

73° /50°
25%
Mostly cloudy

RealFeel®72°

RealFeel Shade™72°

Max UV Index4.0 (Moderate)

WindSW 6 mph

Tue 5/5

68° /53°
25%
Times of sun and clouds

RealFeel®70°

RealFeel Shade™67°

Max UV Index5.0 (Moderate)

WindNW 7 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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