O'Fallon, MO

Hourly

5 AM

72° RealFeel® 75° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 1% Mostly clear

• Wind: SSW 6 mph
• Air Quality: Fair
• Wind Gusts: 7 mph
• Humidity: 95%
• Indoor Humidity: 95% (Very Humid)
• Dew Point: 70° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 16%
• Visibility: 10 mi
• Cloud Ceiling: 33300 ft

6 AM

72° RealFeel® 74° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 1% Mostly sunny

• RealFeel Shade™: 74°
• Wind: S 6 mph
• Air Quality: Fair
• Max UV Index: 0.2 (Low)
• Wind Gusts: 7 mph
• Humidity: 90%
• Indoor Humidity: 90% (Very Humid)
• Dew Point: 69° F
• AccuLumen Brightness Index™: 2 (Dark)
• Cloud Cover: 12%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

7 AM

74° RealFeel® 78° Pleasant RealFeel Guide Pleasant 63° to 81° Most consider this temperature range ideal. LEARN MORE 3% Mostly sunny

• RealFeel Shade™: 76°
• Wind: S 6 mph
• Air Quality: Fair
• Max UV Index: 1.2 (Low)
• Wind Gusts: 7 mph
• Humidity: 85%
• Indoor Humidity: 85% (Very Humid)
• Dew Point: 69° F
• AccuLumen Brightness Index™: 7 (Bright)
• Cloud Cover: 11%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

8 AM

76° RealFeel® 83° Very Warm RealFeel Guide Very Warm 82° to 89° Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine. LEARN MORE 7% Mostly sunny

• RealFeel Shade™: 79°
• Wind: SSW 7 mph
• Air Quality: Fair
• Max UV Index: 2.1 (Low)
• Wind Gusts: 8 mph
• Humidity: 84%
• Indoor Humidity: 84% (Very Humid)
• Dew Point: 71° F
• AccuLumen Brightness Index™: 9 (Very Bright)
• Cloud Cover: 26%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

9 AM

80° RealFeel® 89° Very Warm RealFeel Guide Very Warm 82° to 89° Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine. LEARN MORE 7% Partly sunny

• RealFeel Shade™: 84°
• Heat Index: 83°
• Wind: SW 7 mph
• Air Quality: Fair
• Max UV Index: 3.4 (Moderate)
• Wind Gusts: 8 mph
• Humidity: 77%
• Indoor Humidity: 77% (Extremely Humid)
• Dew Point: 72° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 47%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

10 AM

83° RealFeel® 93° Hot RealFeel Guide Hot 90° to 100° Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities. LEARN MORE 6% Intermittent clouds

• RealFeel Shade™: 88°
• Heat Index: 89°
• Wind: SW 7 mph
• Air Quality: Fair
• Max UV Index: 4.5 (Moderate)
• Wind Gusts: 10 mph
• Humidity: 70%
• Indoor Humidity: 70% (Extremely Humid)
• Dew Point: 72° F
• AccuLumen Brightness Index™: 6 (Medium)
• Cloud Cover: 65%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

11 AM

85° RealFeel® 96° Hot RealFeel Guide Hot 90° to 100° Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities. LEARN MORE 5% Intermittent clouds

• RealFeel Shade™: 89°
• Heat Index: 91°
• Wind: WSW 8 mph
• Air Quality: Fair
• Max UV Index: 6.0 (High)
• Wind Gusts: 10 mph
• Humidity: 65%
• Indoor Humidity: 65% (Extremely Humid)
• Dew Point: 72° F
• AccuLumen Brightness Index™: 5 (Medium)
• Cloud Cover: 74%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

12 PM

86° RealFeel® 98° Hot RealFeel Guide Hot 90° to 100° Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities. LEARN MORE 5% Mostly cloudy

• RealFeel Shade™: 90°
• Heat Index: 92°
• Wind: WNW 8 mph
• Air Quality: Fair
• Max UV Index: 7.6 (Very High)
• Wind Gusts: 9 mph
• Humidity: 63%
• Indoor Humidity: 63% (Extremely Humid)
• Dew Point: 72° F
• AccuLumen Brightness Index™: 5 (Medium)
• Cloud Cover: 77%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

1 PM

86° RealFeel® 99° Hot RealFeel Guide Hot 90° to 100° Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities. LEARN MORE 8% Mostly cloudy

• RealFeel Shade™: 90°
• Heat Index: 93°
• Wind: WNW 7 mph
• Air Quality: Fair
• Max UV Index: 8.6 (Very High)
• Wind Gusts: 9 mph
• Humidity: 62%
• Indoor Humidity: 62% (Extremely Humid)
• Dew Point: 72° F
• AccuLumen Brightness Index™: 5 (Medium)
• Cloud Cover: 76%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

2 PM

83° RealFeel® 90° Hot RealFeel Guide Hot 90° to 100° Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities. LEARN MORE 51% Mostly cloudy w/ t-storms

• RealFeel Shade™: 86°
• Heat Index: 90°
• Wind: W 8 mph
• Air Quality: Fair
• Max UV Index: 3.2 (Moderate)
• Wind Gusts: 9 mph
• Humidity: 79%
• Indoor Humidity: 79% (Extremely Humid)
• Dew Point: 76° F
• AccuLumen Brightness Index™: 5 (Medium)
• Cloud Cover: 74%
• Rain: 0.15 in
• Visibility: 4 mi
• Cloud Ceiling: 2000 ft

3 PM

88° RealFeel® 99° Hot RealFeel Guide Hot 90° to 100° Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities. LEARN MORE 47% Intermittent clouds

• RealFeel Shade™: 92°
• Heat Index: 95°
• Wind: S 9 mph
• Air Quality: Fair
• Max UV Index: 6.4 (High)
• Wind Gusts: 10 mph
• Humidity: 59%
• Indoor Humidity: 59% (Extremely Humid)
• Dew Point: 72° F
• AccuLumen Brightness Index™: 6 (Medium)
• Cloud Cover: 70%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

4 PM

86° RealFeel® 94° Hot RealFeel Guide Hot 90° to 100° Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities. LEARN MORE 35% Intermittent clouds

• RealFeel Shade™: 89°
• Heat Index: 92°
• Wind: SSE 9 mph
• Air Quality: Fair
• Max UV Index: 4.5 (Moderate)
• Wind Gusts: 12 mph
• Humidity: 64%
• Indoor Humidity: 64% (Extremely Humid)
• Dew Point: 72° F
• AccuLumen Brightness Index™: 6 (Medium)
• Cloud Cover: 65%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

5 PM

86° RealFeel® 94° Hot RealFeel Guide Hot 90° to 100° Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities. LEARN MORE 19% Intermittent clouds

• RealFeel Shade™: 90°
• Heat Index: 93°
• Wind: SSE 8 mph
• Air Quality: Fair
• Max UV Index: 3.4 (Moderate)
• Wind Gusts: 10 mph
• Humidity: 62%
• Indoor Humidity: 62% (Extremely Humid)
• Dew Point: 72° F
• AccuLumen Brightness Index™: 7 (Bright)
• Cloud Cover: 57%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

6 PM

85° RealFeel® 93° Hot RealFeel Guide Hot 90° to 100° Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities. LEARN MORE 19% Intermittent clouds

• RealFeel Shade™: 90°
• Heat Index: 92°
• Wind: SSE 7 mph
• Air Quality: Fair
• Max UV Index: 2.1 (Low)
• Wind Gusts: 12 mph
• Humidity: 65%
• Indoor Humidity: 65% (Extremely Humid)
• Dew Point: 73° F
• AccuLumen Brightness Index™: 8 (Bright)
• Cloud Cover: 51%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

7 PM

84° RealFeel® 91° Hot RealFeel Guide Hot 90° to 100° Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities. LEARN MORE 24% Intermittent clouds

• RealFeel Shade™: 89°
• Heat Index: 90°
• Wind: SSE 6 mph
• Air Quality: Fair
• Max UV Index: 1.2 (Low)
• Wind Gusts: 9 mph
• Humidity: 70%
• Indoor Humidity: 70% (Extremely Humid)
• Dew Point: 73° F
• AccuLumen Brightness Index™: 6 (Medium)
• Cloud Cover: 53%
• Visibility: 10 mi
• Cloud Ceiling: 30000 ft

8 PM

82° RealFeel® 88° Very Warm RealFeel Guide Very Warm 82° to 89° Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine. LEARN MORE 34% Intermittent clouds

• RealFeel Shade™: 88°
• Heat Index: 88°
• Wind: SSE 6 mph
• Air Quality: Fair
• Max UV Index: 0.2 (Low)
• Wind Gusts: 7 mph
• Humidity: 74%
• Indoor Humidity: 74% (Extremely Humid)
• Dew Point: 73° F
• AccuLumen Brightness Index™: 1 (Dark)
• Cloud Cover: 66%
• Visibility: 10 mi
• Cloud Ceiling: 24900 ft

9 PM

81° RealFeel® 87° Very Warm RealFeel Guide Very Warm 82° to 89° Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine. LEARN MORE 34% Mostly cloudy

• Heat Index: 85°
• Wind: SE 6 mph
• Air Quality: Fair
• Wind Gusts: 7 mph
• Humidity: 78%
• Indoor Humidity: 78% (Extremely Humid)
• Dew Point: 73° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 83%
• Visibility: 10 mi
• Cloud Ceiling: 19800 ft

10 PM

79° RealFeel® 84° Very Warm RealFeel Guide Very Warm 82° to 89° Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine. LEARN MORE 39% Cloudy

• Heat Index: 80°
• Wind: SE 6 mph
• Air Quality: Fair
• Wind Gusts: 7 mph
• Humidity: 82%
• Indoor Humidity: 82% (Extremely Humid)
• Dew Point: 73° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 97%
• Visibility: 10 mi
• Cloud Ceiling: 14700 ft

11 PM

77° RealFeel® 83° Very Warm RealFeel Guide Very Warm 82° to 89° Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine. LEARN MORE 49% Cloudy

• Wind: SE 6 mph
• Air Quality: Fair
• Wind Gusts: 7 mph
• Humidity: 87%
• Indoor Humidity: 87% (Extremely Humid)
• Dew Point: 73° F
• AccuLumen Brightness Index™: 0 (Dark)
• Cloud Cover: 100%
• Visibility: 10 mi
• Cloud Ceiling: 14700 ft