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Boston, Philly hit 100, NYC breaks record from 1888 amid heat wave. Get the latest Chevron right
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O'Fallon, IL

80°F
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Winter Center
Today Hourly Daily Radar MinuteCast Monthly Air Quality Health & Activities
Wednesday, June 25

Current Weather

12:35 AM

80°F
Mostly clear
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
RealFeel®
89°
Wind
SW 2 mph
Wind Gusts
5 mph
Humidity
85%
Indoor Humidity
85% (Extremely Humid)
Dew Point
76° F
Pressure
↔ 30.14 in
Cloud Cover
22%
Visibility
12 mi
Cloud Ceiling
40000 ft

Day

6/25
94°Hi
RealFeel® 105°
Very Hot
RealFeel Guide
Very Hot
101° to 107°
Caution advised. Danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
RealFeel Shade™ 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.
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Hot and humid with plenty of sunshine; danger of dehydration and heatstroke if outside for extended periods of time
alerts

Heat Advisory

9:00 PM Monday - 9:00 PM Thursday

Max UV Index11 (Extreme)

AccuLumen Brightness Index™9 (Very Bright)

WindSSW 7 mph

Wind Gusts15 mph

Probability of Precipitation25%

Probability of Thunderstorms6%

Precipitation0.00 in

Cloud Cover9%

Morning

Afternoon

Night

6/25
75°Lo
RealFeel® 81°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
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Clear, warm and very humid
alerts

Heat Advisory

9:00 PM Monday - 9:00 PM Thursday

WindSSW 5 mph

Wind Gusts10 mph

Probability of Precipitation4%

Probability of Thunderstorms1%

Precipitation0.00 in

Cloud Cover5%

Evening

Overnight

Sun & Moon

14 hrs 52 mins
Rise 5:36 AM
Set 8:28 PM
New Moon
Rise 5:22 AM
Set 9:20 PM

Temperature History

6/25
High
Low
Forecast
94°
75°
Average
89°
67°
Last Year
102°
73°
Record
102°
2024
47°
1979

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Weather Near O'Fallon:

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