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High risk for severe weather in the central, eastern US. Get the forecast details. Chevron right
March megastorm: Blizzard, dangerous winds. Get the forecast. Chevron right

O'Fallon, MO

42°F
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O'Fallon

Missouri

42°
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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 15 - April 13

Sun 3/15

67° /21°
90%

WinterCast

A coating to an inch

Sun, 3/15, 9:00 PM - Mon, 3/16, 5:00 AM

Snow
Cloudy and windy; showers and thunderstorms, some heavy this afternoon; there can be damaging winds, hail and even an isolated tornado
alerts

Wind Advisory

10:00 AM Sunday - 12:00 PM Monday

RealFeel®64°

RealFeel Shade™64°

Max UV Index2.0 (Low)

WindSSW 18 mph

Mon 3/16

31° /12°
41%
Very windy; a flurry in the morning; otherwise, mostly cloudy and very cold
alerts

Wind Advisory

10:00 AM Sunday - 12:00 PM Monday

RealFeel®14°

RealFeel Shade™14°

Max UV Index2.0 (Low)

WindWNW 22 mph

Tue 3/17

36° /32°
3%
Partly sunny and cold

RealFeel®34°

RealFeel Shade™30°

Max UV Index5.0 (Moderate)

WindSW 8 mph

Wed 3/18

68° /40°
8%
Breezy in the morning; otherwise, mostly sunny and warmer

RealFeel®69°

RealFeel Shade™65°

Max UV Index5.0 (Moderate)

WindSSW 10 mph

Thu 3/19

74° /43°
5%
Mostly sunny and very warm

RealFeel®77°

RealFeel Shade™72°

Max UV Index5.0 (Moderate)

WindNNW 6 mph

Fri 3/20

75° /50°
10%
Mostly sunny and very warm

RealFeel®75°

RealFeel Shade™72°

Max UV Index5.0 (Moderate)

WindSSW 8 mph

Sat 3/21

75° /48°
10%
Mostly sunny and remaining warm

RealFeel®77°

RealFeel Shade™72°

Max UV Index5.0 (Moderate)

WindNW 8 mph

Sun 3/22

68° /44°
12%
Times of clouds and sun

RealFeel®66°

RealFeel Shade™64°

Max UV Index3.0 (Moderate)

WindENE 12 mph

Mon 3/23

67° /42°
5%
Turning cloudy

RealFeel®66°

RealFeel Shade™64°

Max UV Index5.0 (Moderate)

WindENE 10 mph

Tue 3/24

60° /41°
55%
A touch of rain in the morning; otherwise, cloudy

RealFeel®61°

RealFeel Shade™61°

Max UV Index2.0 (Low)

WindNNE 7 mph

Wed 3/25

63° /40°
0%
Mostly sunny and windy

RealFeel®60°

RealFeel Shade™57°

Max UV Index6.0 (High)

WindWNW 18 mph

Thu 3/26

56° /34°
6%
Periods of clouds and sunshine

RealFeel®53°

RealFeel Shade™49°

Max UV Index4.0 (Moderate)

WindNW 16 mph

Fri 3/27

54° /36°
1%
Sunshine

RealFeel®53°

RealFeel Shade™49°

Max UV Index6.0 (High)

WindNNW 10 mph

Sat 3/28

62° /37°
25%
A thick cloud cover

RealFeel®59°

RealFeel Shade™59°

Max UV Index2.0 (Low)

WindENE 9 mph

Sun 3/29

56° /39°
20%
Mostly sunny

RealFeel®62°

RealFeel Shade™55°

Max UV Index6.0 (High)

WindNE 6 mph

Mon 3/30

65° /43°
5%
Plenty of sunshine

RealFeel®70°

RealFeel Shade™64°

Max UV Index6.0 (High)

WindSSE 6 mph

Tue 3/31

66° /45°
25%
Cloudy

RealFeel®65°

RealFeel Shade™65°

Max UV Index2.0 (Low)

WindS 7 mph

Wed 4/1

65° /44°
68%
Periods of rain

RealFeel®64°

RealFeel Shade™64°

Max UV Index1.0 (Low)

WindE 6 mph

Thu 4/2

62° /43°
25%
Cloudy

RealFeel®59°

RealFeel Shade™59°

Max UV Index2.0 (Low)

WindNNW 9 mph

Fri 4/3

54° /40°
63%
Cooler with rain

RealFeel®49°

RealFeel Shade™48°

Max UV Index1.0 (Low)

WindNW 10 mph

Sat 4/4

55° /39°
58%
Overcast with a bit of rain in the afternoon

RealFeel®56°

RealFeel Shade™54°

Max UV Index5.0 (Moderate)

WindE 6 mph

Sun 4/5

56° /41°
10%
Sunny

RealFeel®61°

RealFeel Shade™53°

Max UV Index7.0 (High)

WindNW 7 mph

Mon 4/6

63° /44°
10%
Mostly sunny

RealFeel®71°

RealFeel Shade™63°

Max UV Index7.0 (High)

WindSW 4 mph

Tue 4/7

68° /40°
60%
Cloudy; a shower in spots in the morning followed by a little rain in the afternoon

RealFeel®65°

RealFeel Shade™65°

Max UV Index2.0 (Low)

WindNE 9 mph

Wed 4/8

56° /40°
25%
A thick cloud cover and cooler

RealFeel®56°

RealFeel Shade™56°

Max UV Index2.0 (Low)

WindENE 6 mph

Thu 4/9

57° /35°
10%
Mostly sunny

RealFeel®68°

RealFeel Shade™57°

Max UV Index7.0 (High)

WindNNE 4 mph

Fri 4/10

58° /39°
25%
Cloudy

RealFeel®58°

RealFeel Shade™57°

Max UV Index2.0 (Low)

WindS 6 mph

Sat 4/11

58° /43°
20%
Sun followed by increasing clouds

RealFeel®63°

RealFeel Shade™56°

Max UV Index7.0 (High)

WindWNW 8 mph

Sun 4/12

60° /36°
25%
Mostly cloudy

RealFeel®60°

RealFeel Shade™56°

Max UV Index7.0 (High)

WindN 8 mph

Mon 4/13

58° /37°
5%
Sunshine

RealFeel®63°

RealFeel Shade™55°

Max UV Index8.0 (Very High)

WindWNW 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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