Current Weather Forecast for O'Fallon

MO 63368  |   1:45pm

Weather Conditions

84°

Feels Like 93°

Showers in the Vicinity

74° 92° EXTREME HEAT

EXTREME HEAT

9

UV Index

Moderate

Air Quality

SE 2 mph

Wind

0 in

rain

Today

Sat 7/19

92°

Highest Temperature

45%

Scattered showers and thunderstorms. High 92F. Winds SW at 5 to 10 mph. Chance of rain 50%.

Tonight

Sat 7/19

76°

Lowest Temperature

6%

A few clouds. Low 76F. Winds SW at 5 to 10 mph.

Tomorrow

Sun 7/20

95°

Highest Temperature

7%

Partly cloudy skies. High near 95F. Winds SW at 5 to 10 mph.

Precipitation For O'Fallon

Thunder ending in 44 minutes.

Next 12 Hours Next 7 Days

Next 12 Hours Forecast in O'Fallon

Hourly Weather Forecast & Temperature

2PM

57%

86°

Feels Like 95°

EXTREME HEAT

Scattered Thunderstorms

SW 3 mph

Wind

1013 mb

Pressure

69%

Humidity

8

UV Index

7mi

Visibility

50%

Cloud Cover

3PM

24%

84°

Feels Like 92°

EXTREME HEAT

Mostly Cloudy

SW 5 mph

Wind

1013 mb

Pressure

70%

Humidity

6

UV Index

10mi

Visibility

66%

Cloud Cover

4PM

15%

88°

Feels Like 96°

EXTREME HEAT

Partly Cloudy

SW 6 mph

Wind

1013 mb

Pressure

61%

Humidity

5

UV Index

10mi

Visibility

55%

Cloud Cover

5PM

15%

91°

Feels Like 99°

EXTREME HEAT

Mostly Cloudy

SW 8 mph

Wind

1012 mb

Pressure

54%

Humidity

3

UV Index

10mi

Visibility

62%

Cloud Cover

6PM

1%

89°

Feels Like 97°

EXTREME HEAT

Partly Cloudy

SW 7 mph

Wind

1012 mb

Pressure

57%

Humidity

1

UV Index

10mi

Visibility

53%

Cloud Cover

7PM

1%

88°

Feels Like 96°

EXTREME HEAT

Partly Cloudy

SW 6 mph

Wind

1012 mb

Pressure

61%

Humidity

0

UV Index

10mi

Visibility

45%

Cloud Cover

8PM

1%

86°

Feels Like 94°

EXTREME HEAT

Partly Cloudy

SSW 4 mph

Wind

1012 mb

Pressure

68%

Humidity

0

UV Index

10mi

Visibility

45%

Cloud Cover

9PM

2%

84°

Feels Like 91°

EXTREME HEAT

Partly Cloudy

SSW 4 mph

Wind

1013 mb

Pressure

70%

Humidity

0

UV Index

10mi

Visibility

47%

Cloud Cover

10PM

3%

83°

Feels Like 89°

EXTREME HEAT

Partly Cloudy

SSW 5 mph

Wind

1013 mb

Pressure

73%

Humidity

0

UV Index

10mi

Visibility

52%

Cloud Cover

11PM

3%

82°

Feels Like 88°

EXTREME HEAT

Partly Cloudy

SSW 5 mph

Wind

1013 mb

Pressure

76%

Humidity

0

UV Index

10mi

Visibility

50%

Cloud Cover

12AM

4%

81°

Feels Like 87°

EXTREME HEAT

Partly Cloudy

SSW 4 mph

Wind

1013 mb

Pressure

77%

Humidity

0

UV Index

10mi

Visibility

33%

Cloud Cover

1AM

4%

80°

Feels Like 85°

EXTREME HEAT

Partly Cloudy

SW 4 mph

Wind

1013 mb

Pressure

77%

Humidity

0

UV Index

10mi

Visibility

52%

Cloud Cover

Sat 7/19

Sat

45%

74°

92°

Scattered thunderstorms possible. Highs in the low 90s and lows in the mid 70s.

99°

Feels Like

SW 8 mph

Wind

63%

Humidity

9

UV Index

5:53 AM

Sunrise

8:24 PM

Sunset

Sun 7/20

Sun

7%

76°

95°

EXTREME HEAT

Partly cloudy. Highs in the mid 90s and lows in the mid 70s.

103°

Feels Like

SW 9 mph

Wind

59%

Humidity

10

UV Index

5:54 AM

Sunrise

8:24 PM

Sunset

Mon 7/21

Mon

17%

75°

89°

EXTREME HEAT

Partly cloudy. Highs in the upper 80s and lows in the mid 70s.

97°

Feels Like

SW 6 mph

Wind

72%

Humidity

9

UV Index

5:55 AM

Sunrise

8:23 PM

Sunset

Tue 7/22

Tue

16%

74°

94°

EXTREME HEAT

More sun than clouds. Highs in the mid 90s and lows in the mid 70s.

102°

Feels Like

SSE 6 mph

Wind

66%

Humidity

10

UV Index

5:55 AM

Sunrise

8:22 PM

Sunset

Wed 7/23

Wed

6%

75°

97°

EXTREME HEAT

A few clouds. Highs in the upper 90s and lows in the mid 70s.

103°

Feels Like

S 6 mph

Wind

56%

Humidity

10

UV Index

5:56 AM

Sunrise

8:21 PM

Sunset

Thu 7/24

Thu

5%

75°

97°

EXTREME HEAT

More sun than clouds. Highs in the upper 90s and lows in the mid 70s.

102°

Feels Like

SSW 7 mph

Wind

54%

Humidity

10

UV Index

5:57 AM

Sunrise

8:21 PM

Sunset

Fri 7/25

Fri

11%

75°

97°

A few clouds. Highs in the upper 90s and lows in the mid 70s.

103°

Feels Like

SW 5 mph

Wind

56%

Humidity

9

UV Index

5:58 AM

Sunrise

8:20 PM

Sunset

Sat 7/26

Sat

24%

75°

96°

A few clouds. Highs in the mid 90s and lows in the mid 70s.

104°

Feels Like

SSW 6 mph

Wind

59%

Humidity

9

UV Index

5:59 AM

Sunrise

8:19 PM

Sunset

Need to see beyond 12 Hours?

Find more forecast on the FREE FOX WEATHER App

GO TO APP STORE

Latest Stories from Missouri

Flash flooding in Kansas City closes highways, leads to water rescues

For the second day in a row, heavy rainfall doused Kansas City on Thursday, leading to flash flooding on major highways and water rescues across the metropolitan area.

Severe thunderstorms bring 70+ mph winds, Flash Flood Emergency to Iowa

Severe thunderstorms rolled across the Midwest Friday, bringing rounds of damaging wind gusts, torrential rains and even a few reported tornadoes.

2025 severe weather season still busiest in more than a decade

The 2025 spring tornado season was one of the most active in over a decade, with over 900 tornado reports. Several intense outbreaks occurred, including five EF4 twisters. Despite the activity, no EF5 tornadoes were reported, continuing a 12-year streak.

Texas postal worker among at least 2 deaths reported during heat wave that has baked US

A U.S. postal worker and a 55-year-old woman died during a far-reaching heat wave that baked much of the country this week.

Load More Stories