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Hurricane season starts in 67 days. Here's what AccuWeather experts are saying about the forecast. Chevron right

O'Fallon, IL

51°F
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O'Fallon

Illinois

51°
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O'Fallon, IL Weather
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Chevron right

12 AM

55°
RealFeel® 48°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 37%
Chevron down
Intermittent clouds

WindN 15 mph

Air QualityPoor

Wind Gusts18 mph

Humidity76%

Indoor Humidity47% (Ideal Humidity)

Dew Point47° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover61%

Visibility10 mi

Cloud Ceiling20000 ft

1 AM

54°
RealFeel® 46°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 39%
Chevron down
Partly cloudy

WindNNE 17 mph

Air QualityPoor

Wind Gusts25 mph

Humidity80%

Indoor Humidity49% (Ideal Humidity)

Dew Point48° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover45%

Visibility10 mi

Cloud Ceiling30000 ft

2 AM

53°
RealFeel® 45°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 49%
Chevron down
Cloudy

WindNNE 17 mph

Air QualityPoor

Wind Gusts25 mph

Humidity83%

Indoor Humidity49% (Ideal Humidity)

Dew Point48° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover99%

Visibility10 mi

Cloud Ceiling1300 ft

3 AM

51°
RealFeel® 43°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 49%
Chevron down
Cloudy

WindNNE 16 mph

Air QualityPoor

Wind Gusts24 mph

Humidity82%

Indoor Humidity45% (Ideal Humidity)

Dew Point46° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover100%

Visibility10 mi

Cloud Ceiling1600 ft

4 AM

49°
RealFeel® 35°
Cold
RealFeel Guide
Cold
25° to 39°
Coats and hats are appropriate, consider gloves and a scarf.
LEARN MORE
rain drop 56%
Chevron down
Thunderstorms

WindNNE 15 mph

Air QualityPoor

Wind Gusts23 mph

Humidity82%

Indoor Humidity41% (Ideal Humidity)

Dew Point44° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover100%

Rain0.28 in

Visibility3 mi

Cloud Ceiling1800 ft

5 AM

46°
RealFeel® 37°
Cold
RealFeel Guide
Cold
25° to 39°
Coats and hats are appropriate, consider gloves and a scarf.
LEARN MORE
rain drop 40%
Chevron down
Cloudy

WindN 15 mph

Air QualityFair

Wind Gusts21 mph

Humidity82%

Indoor Humidity37% (Ideal Humidity)

Dew Point41° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover96%

Visibility10 mi

Cloud Ceiling2000 ft

6 AM

44°
RealFeel® 34°
Cold
RealFeel Guide
Cold
25° to 39°
Coats and hats are appropriate, consider gloves and a scarf.
LEARN MORE
rain drop 34%
Chevron down
Cloudy

WindN 15 mph

Air QualityFair

Wind Gusts20 mph

Humidity81%

Indoor Humidity33% (Slightly Dry)

Dew Point38° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover95%

Visibility10 mi

Cloud Ceiling2000 ft

7 AM

43°
RealFeel® 32°
Cold
RealFeel Guide
Cold
25° to 39°
Coats and hats are appropriate, consider gloves and a scarf.
LEARN MORE
rain drop 34%
Chevron down
Cloudy

RealFeel Shade™32°

WindN 15 mph

Air QualityFair

Max UV Index0.0 (Low)

Wind Gusts18 mph

Humidity78%

Indoor Humidity31% (Slightly Dry)

Dew Point36° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover95%

Visibility10 mi

Cloud Ceiling4800 ft

8 AM

42°
RealFeel® 31°
Cold
RealFeel Guide
Cold
25° to 39°
Coats and hats are appropriate, consider gloves and a scarf.
LEARN MORE
rain drop 34%
Chevron down
Cloudy

RealFeel Shade™31°

WindN 16 mph

Air QualityFair

Max UV Index0.4 (Low)

Wind Gusts23 mph

Humidity74%

Indoor Humidity43% (Slightly Dry)

Dew Point34° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover95%

Visibility10 mi

Cloud Ceiling8000 ft

9 AM

40°
RealFeel® 29°
Cold
RealFeel Guide
Cold
25° to 39°
Coats and hats are appropriate, consider gloves and a scarf.
LEARN MORE
rain drop 34%
Chevron down
Cloudy

RealFeel Shade™29°

WindN 16 mph

Air QualityFair

Max UV Index0.7 (Low)

Wind Gusts25 mph

Humidity75%

Indoor Humidity41% (Slightly Dry)

Dew Point33° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover96%

Visibility10 mi

Cloud Ceiling11100 ft

10 AM

42°
RealFeel® 31°
Cold
RealFeel Guide
Cold
25° to 39°
Coats and hats are appropriate, consider gloves and a scarf.
LEARN MORE
rain drop 37%
Chevron down
Cloudy

RealFeel Shade™30°

WindN 16 mph

Air QualityFair

Max UV Index1.1 (Low)

Wind Gusts28 mph

Humidity68%

Indoor Humidity40% (Slightly Dry)

Dew Point32° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover100%

Visibility10 mi

Cloud Ceiling14200 ft

11 AM

44°
RealFeel® 35°
Cold
RealFeel Guide
Cold
25° to 39°
Coats and hats are appropriate, consider gloves and a scarf.
LEARN MORE
rain drop 47%
Chevron down
Cloudy

RealFeel Shade™33°

WindN 16 mph

Air QualityFair

Max UV Index1.5 (Low)

Wind Gusts29 mph

Humidity62%

Indoor Humidity40% (Slightly Dry)

Dew Point32° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover100%

Visibility10 mi

Cloud Ceiling15800 ft

12 PM

46°
RealFeel® 36°
Cold
RealFeel Guide
Cold
25° to 39°
Coats and hats are appropriate, consider gloves and a scarf.
LEARN MORE
rain drop 51%
Chevron down
Showers

RealFeel Shade™34°

WindN 16 mph

Air QualityFair

Max UV Index1.5 (Low)

Wind Gusts30 mph

Humidity57%

Indoor Humidity40% (Slightly Dry)

Dew Point32° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover95%

Rain0.02 in

Visibility6 mi

Cloud Ceiling7000 ft

1 PM

49°
RealFeel® 43°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 47%
Chevron down
Cloudy

RealFeel Shade™39°

WindN 15 mph

Air QualityFair

Max UV Index2.5 (Moderate)

Wind Gusts29 mph

Humidity52%

Indoor Humidity40% (Slightly Dry)

Dew Point32° F

AccuLumen Brightness Index™1 (Dark)

Cloud Cover95%

Visibility10 mi

Cloud Ceiling18900 ft

2 PM

51°
RealFeel® 48°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 20%
Chevron down
Intermittent clouds

RealFeel Shade™43°

WindN 15 mph

Air QualityFair

Max UV Index4.9 (Moderate)

Wind Gusts28 mph

Humidity46%

Indoor Humidity39% (Slightly Dry)

Dew Point31° F

AccuLumen Brightness Index™7 (Bright)

Cloud Cover55%

Visibility10 mi

Cloud Ceiling22600 ft

3 PM

53°
RealFeel® 49°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 20%
Chevron down
Partly sunny

RealFeel Shade™45°

WindN 16 mph

Air QualityFair

Max UV Index4.3 (Moderate)

Wind Gusts30 mph

Humidity41%

Indoor Humidity38% (Slightly Dry)

Dew Point30° F

AccuLumen Brightness Index™8 (Bright)

Cloud Cover46%

Visibility10 mi

Cloud Ceiling30000 ft

4 PM

54°
RealFeel® 50°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 20%
Chevron down
Partly sunny

RealFeel Shade™47°

WindN 16 mph

Air QualityFair

Max UV Index3.2 (Moderate)

Wind Gusts31 mph

Humidity37%

Indoor Humidity37% (Dry)

Dew Point28° F

AccuLumen Brightness Index™8 (Bright)

Cloud Cover46%

Visibility10 mi

Cloud Ceiling30000 ft

5 PM

53°
RealFeel® 48°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 20%
Chevron down
Partly sunny

RealFeel Shade™45°

WindNNW 16 mph

Air QualityPoor

Max UV Index2.1 (Low)

Wind Gusts29 mph

Humidity37%

Indoor Humidity37% (Dry)

Dew Point28° F

AccuLumen Brightness Index™8 (Bright)

Cloud Cover46%

Visibility10 mi

Cloud Ceiling30000 ft

6 PM

52°
RealFeel® 46°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 20%
Chevron down
Partly sunny

RealFeel Shade™44°

WindNNW 14 mph

Air QualityFair

Max UV Index1.1 (Low)

Wind Gusts27 mph

Humidity38%

Indoor Humidity36% (Dry)

Dew Point27° F

AccuLumen Brightness Index™6 (Medium)

Cloud Cover46%

Visibility10 mi

Cloud Ceiling30000 ft

7 PM

49°
RealFeel® 42°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 13%
Chevron down
Partly sunny

RealFeel Shade™42°

WindNNW 13 mph

Air QualityFair

Max UV Index0.1 (Low)

Wind Gusts23 mph

Humidity41%

Indoor Humidity36% (Dry)

Dew Point26° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover46%

Visibility10 mi

Cloud Ceiling30000 ft

8 PM

47°
RealFeel® 41°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 0%
Chevron down
Clear

WindNNW 9 mph

Air QualityFair

Wind Gusts23 mph

Humidity44%

Indoor Humidity35% (Dry)

Dew Point26° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover8%

Visibility10 mi

Cloud Ceiling30000 ft

9 PM

45°
RealFeel® 40°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
rain drop 0%
Chevron down
Clear

WindNNW 8 mph

Air QualityFair

Wind Gusts17 mph

Humidity48%

Indoor Humidity35% (Dry)

Dew Point26° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover3%

Visibility10 mi

Cloud Ceiling30000 ft

10 PM

43°
RealFeel® 39°
Cold
RealFeel Guide
Cold
25° to 39°
Coats and hats are appropriate, consider gloves and a scarf.
LEARN MORE
rain drop 0%
Chevron down
Clear

WindNNW 7 mph

Air QualityFair

Wind Gusts13 mph

Humidity51%

Indoor Humidity35% (Dry)

Dew Point26° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover0%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

42°
RealFeel® 37°
Cold
RealFeel Guide
Cold
25° to 39°
Coats and hats are appropriate, consider gloves and a scarf.
LEARN MORE
rain drop 0%
Chevron down
Clear

WindNNW 7 mph

Air QualityFair

Wind Gusts12 mph

Humidity53%

Indoor Humidity35% (Dry)

Dew Point26° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover0%

Visibility10 mi

Cloud Ceiling30000 ft

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World North America United States Illinois O'Fallon

Weather Near O'Fallon:

  • O'Fallon, MO
  • St. Charles, MO
  • St. Louis, MO
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