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Hurricane season starts in 67 days. Here's what AccuWeather experts are saying about the forecast. Chevron right
Thursday severe weather threat predicted in 6 states. See the latest forecast. Chevron right

O'Fallon, MO

90°F
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O'Fallon

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O'Fallon, MO Weather
Today WinterCast Local {stormName} Tracker Hourly Daily Radar MinuteCast® Monthly Air Quality Health & Activities

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March 26 - April 24

Thu 3/26

94° /40°
19%
Sunny to partly cloudy, breezy and hot; possible danger of dehydration and heatstroke while doing strenuous activities

RealFeel®93°

RealFeel Shade™90°

Max UV Index6.0 (High)

WindSW 14 mph

Fri 3/27

57° /28°
60%
Windy and cooler; cloudy in the morning with a couple of showers, then a blend of sunshine and clouds in the afternoon

RealFeel®53°

RealFeel Shade™49°

Max UV Index5.0 (Moderate)

WindN 16 mph

Sat 3/28

59° /42°
1%
Plenty of sun

RealFeel®59°

RealFeel Shade™55°

Max UV Index6.0 (High)

WindSE 8 mph

Sun 3/29

71° /57°
9%
Intervals of clouds and sunshine

RealFeel®70°

RealFeel Shade™68°

Max UV Index3.0 (Moderate)

WindS 10 mph

Mon 3/30

84° /64°
14%
Mostly sunny, windy and warmer

RealFeel®84°

RealFeel Shade™81°

Max UV Index6.0 (High)

WindSSW 14 mph

Tue 3/31

82° /55°
21%
Windy and very warm with times of clouds and sun

RealFeel®80°

RealFeel Shade™78°

Max UV Index3.0 (Moderate)

WindSSW 17 mph

Wed 4/1

65° /49°
78%
Morning showers; otherwise, cloudy and cooler

RealFeel®65°

RealFeel Shade™62°

Max UV Index2.0 (Low)

WindNNE 10 mph

Thu 4/2

70° /53°
75%
Rain

RealFeel®65°

RealFeel Shade™64°

Max UV Index2.0 (Low)

WindENE 10 mph

Fri 4/3

69° /47°
59%
Low clouds with a passing shower in the afternoon

RealFeel®68°

RealFeel Shade™68°

Max UV Index2.0 (Low)

WindSE 7 mph

Sat 4/4

69° /43°
59%
Remaining cloudy with a couple of thunderstorms

RealFeel®67°

RealFeel Shade™67°

Max UV Index3.0 (Moderate)

WindSSW 17 mph

Sun 4/5

69° /43°
72%
Periods of rain

RealFeel®68°

RealFeel Shade™67°

Max UV Index4.0 (Moderate)

WindS 10 mph

Mon 4/6

67° /45°
79%
Rain ending in the morning; considerable clouds

RealFeel®67°

RealFeel Shade™63°

Max UV Index3.0 (Moderate)

WindW 10 mph

Tue 4/7

67° /46°
0%
Plenty of sun

RealFeel®76°

RealFeel Shade™65°

Max UV Index7.0 (High)

WindN 4 mph

Wed 4/8

64° /41°
25%
Clouds yielding to sun

RealFeel®67°

RealFeel Shade™61°

Max UV Index7.0 (High)

WindS 9 mph

Thu 4/9

69° /48°
20%
Mostly sunny

RealFeel®71°

RealFeel Shade™66°

Max UV Index7.0 (High)

WindSW 9 mph

Fri 4/10

70° /48°
25%
Cloudy

RealFeel®70°

RealFeel Shade™70°

Max UV Index2.0 (Low)

WindNNE 5 mph

Sat 4/11

67° /49°
25%
Mostly cloudy

RealFeel®67°

RealFeel Shade™64°

Max UV Index2.0 (Low)

WindESE 9 mph

Sun 4/12

70° /50°
25%
Mostly cloudy

RealFeel®68°

RealFeel Shade™68°

Max UV Index4.0 (Moderate)

WindS 10 mph

Mon 4/13

70° /50°
70%
Showers and thunderstorms in the morning; otherwise, mostly cloudy

RealFeel®69°

RealFeel Shade™67°

Max UV Index2.0 (Low)

WindS 16 mph

Tue 4/14

71° /49°
25%
Partly sunny

RealFeel®75°

RealFeel Shade™68°

Max UV Index7.0 (High)

WindSW 8 mph

Wed 4/15

69° /49°
5%
Brilliant sunshine

RealFeel®73°

RealFeel Shade™66°

Max UV Index8.0 (Very High)

WindWSW 8 mph

Thu 4/16

71° /48°
20%
Mostly sunny

RealFeel®77°

RealFeel Shade™69°

Max UV Index8.0 (Very High)

WindW 5 mph

Fri 4/17

72° /50°
10%
Mostly sunny

RealFeel®74°

RealFeel Shade™69°

Max UV Index8.0 (Very High)

WindNNW 6 mph

Sat 4/18

71° /50°
60%
Considerable cloudiness; a morning shower in spots followed by a little rain in the afternoon

RealFeel®68°

RealFeel Shade™67°

Max UV Index2.0 (Low)

WindESE 6 mph

Sun 4/19

63° /49°
60%
Occasional rain

RealFeel®60°

RealFeel Shade™60°

Max UV Index2.0 (Low)

WindESE 9 mph

Mon 4/20

66° /50°
25%
Mostly cloudy

RealFeel®65°

RealFeel Shade™63°

Max UV Index4.0 (Moderate)

WindENE 10 mph

Tue 4/21

68° /45°
25%
Cloudy

RealFeel®66°

RealFeel Shade™66°

Max UV Index2.0 (Low)

WindE 9 mph

Wed 4/22

63° /46°
25%
Times of clouds and sun

RealFeel®70°

RealFeel Shade™61°

Max UV Index8.0 (Very High)

WindENE 6 mph

Thu 4/23

65° /44°
25%
Mostly cloudy

RealFeel®65°

RealFeel Shade™64°

Max UV Index4.0 (Moderate)

WindENE 8 mph

Fri 4/24

64° /48°
25%
Cloudy

RealFeel®62°

RealFeel Shade™61°

Max UV Index2.0 (Low)

WindSE 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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