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100+ F in Phoenix as record-shattering March scorcher intensifies. See how hot it will get. Chevron right

O'Fallon, MO

65°F
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O'Fallon

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O'Fallon, MO Weather
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March 18 - April 16

Wed 3/18

66° /40°
3%
Brilliant sunshine and warmer; breezy this morning, then pleasant this afternoon

RealFeel®72°

RealFeel Shade™64°

Max UV Index5.0 (Moderate)

WindSW 9 mph

Thu 3/19

75° /45°
3%
Mostly sunny and very warm

RealFeel®77°

RealFeel Shade™72°

Max UV Index5.0 (Moderate)

WindSSW 6 mph

Fri 3/20

81° /46°
2%
Partly sunny and very warm

RealFeel®81°

RealFeel Shade™77°

Max UV Index5.0 (Moderate)

WindW 10 mph

Sat 3/21

86° /55°
2%
Very warm with plenty of sunshine

RealFeel®89°

RealFeel Shade™84°

Max UV Index5.0 (Moderate)

WindSW 5 mph

Sun 3/22

78° /37°
3%
Partly sunny and remaining warm; breezy in the afternoon

RealFeel®79°

RealFeel Shade™74°

Max UV Index5.0 (Moderate)

WindNNW 12 mph

Mon 3/23

52° /33°
4%
Partly sunny and cooler

RealFeel®55°

RealFeel Shade™51°

Max UV Index6.0 (High)

WindNNE 8 mph

Tue 3/24

61° /39°
12%
Sun and areas of high clouds

RealFeel®64°

RealFeel Shade™62°

Max UV Index3.0 (Moderate)

WindNE 4 mph

Wed 3/25

71° /51°
3%
Sun through high clouds and warmer

RealFeel®71°

RealFeel Shade™71°

Max UV Index3.0 (Moderate)

WindN 1 mph

Thu 3/26

69° /42°
2%
Mostly sunny

RealFeel®72°

RealFeel Shade™66°

Max UV Index6.0 (High)

WindSSE 7 mph

Fri 3/27

60° /33°
25%
Turning out cloudy and cooler

RealFeel®57°

RealFeel Shade™55°

Max UV Index4.0 (Moderate)

WindNNW 10 mph

Sat 3/28

56° /43°
2%
Intervals of clouds and sunshine

RealFeel®61°

RealFeel Shade™56°

Max UV Index6.0 (High)

WindNNW 5 mph

Sun 3/29

64° /43°
0%
Rather cloudy

RealFeel®72°

RealFeel Shade™65°

Max UV Index6.0 (High)

WindN 5 mph

Mon 3/30

69° /45°
1%
Clouds yielding to sun

RealFeel®71°

RealFeel Shade™67°

Max UV Index4.0 (Moderate)

WindSW 9 mph

Tue 3/31

61° /38°
25%
Cloudy

RealFeel®60°

RealFeel Shade™60°

Max UV Index2.0 (Low)

WindS 7 mph

Wed 4/1

66° /47°
25%
Cloudy

RealFeel®64°

RealFeel Shade™63°

Max UV Index2.0 (Low)

WindS 13 mph

Thu 4/2

68° /48°
58%
Cloudy with a touch of rain in the afternoon

RealFeel®66°

RealFeel Shade™66°

Max UV Index3.0 (Moderate)

WindS 10 mph

Fri 4/3

67° /48°
73%
Cloudy; a passing shower in the morning followed by rain in the afternoon

RealFeel®63°

RealFeel Shade™63°

Max UV Index2.0 (Low)

WindS 10 mph

Sat 4/4

67° /47°
59%
A bit of morning rain; otherwise, remaining cloudy

RealFeel®66°

RealFeel Shade™65°

Max UV Index3.0 (Moderate)

WindS 8 mph

Sun 4/5

68° /46°
60%
A couple of morning showers; otherwise, clouds and breaks of sun

RealFeel®71°

RealFeel Shade™65°

Max UV Index5.0 (Moderate)

WindSW 7 mph

Mon 4/6

68° /47°
20%
Plenty of sunshine

RealFeel®72°

RealFeel Shade™66°

Max UV Index7.0 (High)

WindS 8 mph

Tue 4/7

69° /49°
25%
Turning out cloudy

RealFeel®68°

RealFeel Shade™68°

Max UV Index4.0 (Moderate)

WindS 7 mph

Wed 4/8

69° /49°
20%
Partly sunny

RealFeel®73°

RealFeel Shade™67°

Max UV Index7.0 (High)

WindSSE 7 mph

Thu 4/9

70° /48°
25%
Considerable cloudiness

RealFeel®70°

RealFeel Shade™70°

Max UV Index2.0 (Low)

WindS 5 mph

Fri 4/10

70° /49°
25%
Cloudy

RealFeel®71°

RealFeel Shade™71°

Max UV Index2.0 (Low)

WindESE 2 mph

Sat 4/11

68° /49°
62%
Cloudy with a couple of showers and a thunderstorm

RealFeel®70°

RealFeel Shade™69°

Max UV Index2.0 (Low)

WindWNW 1 mph

Sun 4/12

66° /48°
55%
Cloudy with a bit of rain

RealFeel®67°

RealFeel Shade™65°

Max UV Index2.0 (Low)

WindNE 4 mph

Mon 4/13

63° /49°
25%
Cloudy

RealFeel®65°

RealFeel Shade™64°

Max UV Index2.0 (Low)

WindW 5 mph

Tue 4/14

70° /50°
56%
Occasional rain in the morning; otherwise, overcast

RealFeel®69°

RealFeel Shade™67°

Max UV Index2.0 (Low)

WindS 9 mph

Wed 4/15

73° /48°
25%
Mostly cloudy

RealFeel®74°

RealFeel Shade™70°

Max UV Index3.0 (Moderate)

WindNNW 8 mph

Thu 4/16

65° /49°
63%
Cooler with rain

RealFeel®64°

RealFeel Shade™64°

Max UV Index2.0 (Low)

WindENE 9 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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