Weather Alert
Cornwall Weather Warning NWS WEATHER ALERT FOR THE CORNWALL, IL AREA - Issued: 833 PM CDT Thu Sep 3 2026 Cornwall Weather Warning

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Cornwall, IL Weather - Hour by Hour Forecast

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Cornwall, IL Weather - Hour by Hour Forecast

24 Hour Forecast

Current Conditions - Clear. Temperature is 79°F26°C, dew point 76°F24°C, humidity 90%. Wind direction is SSE at 5 mph8 km/h with visibility of 10 mi16 km. Barometric pressure is 29.88 in1012 mb.
Tonight - Mostly clear. Lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 102 early this evening... Full Forecast
Friday - Sunny, hot with highs in the mid 90s. South winds 5 to 10 mph, becoming southwest in the afternoon. Heat index values up to 105... Full Forecast

Cornwall Hourly Weather

24 Hour Forecast Scroll
Thu, Sep 03
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Cornwall, IL Hourly Weather - Mostly Clear - 9:00 PM Cornwall, IL Hourly Weather - Mostly Clear - 10:00 PM Cornwall, IL Hourly Weather - Mostly Clear - 11:00 PM Cornwall, IL Hourly Weather - Mostly Clear - 12:00 AM Cornwall, IL Hourly Weather - Mostly Clear - 1:00 AM Cornwall, IL Hourly Weather - Mostly Clear - 2:00 AM Cornwall, IL Hourly Weather - Mostly Cloudy - 3:00 AM Cornwall, IL Hourly Weather - Mostly Cloudy - 4:00 AM Cornwall, IL Hourly Weather - Mostly Cloudy - 5:00 AM Cornwall, IL Hourly Weather - Partly Cloudy - 6:00 AM Cornwall, IL Hourly Weather - Partly Cloudy - 7:00 AM Cornwall, IL Hourly Weather - Partly Cloudy - 8:00 AM Cornwall, IL Hourly Weather - Clear - 9:00 AM Cornwall, IL Hourly Weather - Clear - 10:00 AM Cornwall, IL Hourly Weather - Clear - 11:00 AM Cornwall, IL Hourly Weather - Clear - 12:00 PM Cornwall, IL Hourly Weather - Clear - 1:00 PM Cornwall, IL Hourly Weather - Clear - 2:00 PM Cornwall, IL Hourly Weather - Clear - 3:00 PM Cornwall, IL Hourly Weather - Clear - 4:00 PM Cornwall, IL Hourly Weather - Clear - 5:00 PM Cornwall, IL Hourly Weather - Clear - 6:00 PM Cornwall, IL Hourly Weather - Clear - 7:00 PM Cornwall, IL Hourly Weather - Clear - 8:00 PM
Mostly Clear Mostly Clear Mostly Clear Mostly Clear Mostly Clear Mostly Clear Mostly Cloudy Mostly Cloudy Mostly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear Clear
84°F29°C 80°F27°C 79°F26°C 78°F26°C 77°F25°C 76°F24°C 76°F24°C 75°F24°C 75°F24°C 75°F24°C 75°F24°C 78°F26°C 80°F27°C 83°F28°C 86°F30°C 88°F31°C 91°F33°C 91°F33°C 92°F33°C 92°F33°C 90°F32°C 87°F31°C 85°F29°C 82°F28°C
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5% 5% 5% 5% 5% 15% 15% 15% 15% 15% 15% 1% 1% 1% 1% 1% 1% 0% 0% 0% 0% 0% 0% 0%
69°F21°C 69°F21°C 69°F21°C 70°F21°C 70°F21°C 70°F21°C 69°F21°C 69°F21°C 69°F21°C 69°F21°C 69°F21°C 69°F21°C 70°F21°C 70°F21°C 70°F21°C 69°F21°C 69°F21°C 69°F21°C 68°F20°C 68°F20°C 68°F20°C 69°F21°C 69°F21°C 68°F20°C
61% 69% 72% 77% 79% 82% 79% 82% 82% 82% 82% 74% 72% 65% 59% 54% 49% 49% 46% 46% 49% 55% 59% 63%
NE N E S W S ESE NE SE SSW N SSW SE NE NE NE NE NE NE NE NE NE ENE ENE
0 mph 0 mph 0 mph 3 mph 3 mph 3 mph 3 mph 3 mph 3 mph 2 mph 2 mph 2 mph 4 mph 4 mph 4 mph 5 mph 5 mph 5 mph 6 mph 6 mph 6 mph 7 mph 7 mph 7 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 6 mi10 km 6 mi10 km 5 mi8 km 6 mi10 km 6 mi10 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
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Visibility
POP = Probability of Precipitation. ** Indicates missing data/values from KMLI model statistics.

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Prob Precip % = Probability of Precipitation.

Cornwall 36 Hour Forecast

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

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