Weather Alert
O'Fallon Weather Warning NWS WEATHER ALERT FOR THE O FALLON, IL AREA - Issued: 229 AM CDT Sat Sep 5 2026 O'Fallon Weather Warning

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O'Fallon, IL Weather - Hour by Hour Forecast

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O'Fallon, IL Weather - Hour by Hour Forecast

24 Hour Forecast

Current Conditions - Mostly Clear. Temperature is 77°F25°C, dew point 73°F23°C, humidity 87%. Wind direction is N at 0 mph0 km/h with visibility of 10 mi16 km. Barometric pressure is 29.93 in1013 mb.
Rest of Tonight - Mostly clear. Near steady temperature in the upper 70s. Southwest winds around 5 mph... Full Forecast
Saturday - Mostly sunny. Isolated showers and thunderstorms in the afternoon. Hot with highs around 100. Northwest winds around 5 mph. Chance.. Full Forecast

O'Fallon Hourly Weather

24 Hour Forecast Scroll
Sat, Sep 05
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Midnight
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O'Fallon, IL Hourly Weather - Clear - 2:00 AM O'Fallon, IL Hourly Weather - Clear - 3:00 AM O'Fallon, IL Hourly Weather - Clear - 4:00 AM O'Fallon, IL Hourly Weather - Clear - 5:00 AM O'Fallon, IL Hourly Weather - Clear - 6:00 AM O'Fallon, IL Hourly Weather - Clear - 7:00 AM O'Fallon, IL Hourly Weather - Clear - 8:00 AM O'Fallon, IL Hourly Weather - Clear - 9:00 AM O'Fallon, IL Hourly Weather - Clear - 10:00 AM O'Fallon, IL Hourly Weather - Clear - 11:00 AM O'Fallon, IL Hourly Weather - Clear - 12:00 PM O'Fallon, IL Hourly Weather - Clear - 1:00 PM O'Fallon, IL Hourly Weather - Clear - 2:00 PM O'Fallon, IL Hourly Weather - Clear - 3:00 PM O'Fallon, IL Hourly Weather - Clear - 4:00 PM O'Fallon, IL Hourly Weather - Clear - 5:00 PM O'Fallon, IL Hourly Weather - Clear - 6:00 PM O'Fallon, IL Hourly Weather - Clear - 7:00 PM O'Fallon, IL Hourly Weather - Clear - 8:00 PM O'Fallon, IL Hourly Weather - Mostly Clear - 9:00 PM O'Fallon, IL Hourly Weather - Mostly Clear - 10:00 PM O'Fallon, IL Hourly Weather - Mostly Clear - 11:00 PM O'Fallon, IL Hourly Weather - Clear - 12:00 AM O'Fallon, IL Hourly Weather - Clear - 1:00 AM
Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Mostly Clear Mostly Clear Mostly Clear Clear Clear
79°F26°C 78°F26°C 77°F25°C 77°F25°C 77°F25°C 77°F25°C 82°F28°C 87°F31°C 92°F33°C 95°F35°C 98°F37°C 101°F38°C 101°F38°C 102°F39°C 102°F39°C 99°F37°C 95°F35°C 92°F33°C 88°F31°C 84°F29°C 80°F27°C 79°F26°C 79°F26°C 78°F26°C
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11% 11% 11% 11% 11% 11% 1% 1% 1% 1% 1% 1% 2% 2% 2% 2% 2% 2% 12% 12% 12% 12% 12% 12%
72°F22°C 71°F22°C 71°F22°C 71°F22°C 71°F22°C 71°F22°C 71°F22°C 72°F22°C 72°F22°C 71°F22°C 69°F21°C 68°F20°C 67°F19°C 66°F19°C 65°F18°C 65°F18°C 66°F19°C 66°F19°C 67°F19°C 67°F19°C 68°F20°C 69°F21°C 69°F21°C 70°F21°C
79% 79% 82% 82% 82% 82% 69% 61% 52% 46% 39% 35% 34% 31% 30% 33% 39% 43% 50% 57% 67% 72% 72% 77%
SW SW SW SSW SSW W W WNW WNW NW NW NW NNW NNW NNW SW SE N NE NE ENE ENE NE NE
1 mph 1 mph 1 mph 1 mph 1 mph 1 mph 1 mph 4 mph 4 mph 4 mph 5 mph 5 mph 5 mph 6 mph 6 mph 6 mph 4 mph 4 mph 4 mph 5 mph 5 mph 5 mph 3 mph 3 mph
10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km 10 mi16 km
Hour (CDT)
Weather
Clouds
Temperature
Precip. Type
POP
Dewpoint
Humidity
Wind Direction
Wind Speed
Visibility
POP = Probability of Precipitation. ** Indicates missing data/values from KCPS model statistics.

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Prob Precip % = Probability of Precipitation.

O'Fallon 36 Hour Forecast

POP = Probability of Precipitation. ** Indicates missing data/values from model statistics.

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