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Lake Arrowhead, IL 7-Day Night Weather Forecast
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Lake Arrowhead, IL Weather Forecast
Lake Arrowhead, IL Weather Forecast Date: 605 AM CDT Mon Sep 14 2026
The area/counties/county of: Southern Cook, including the cities of: Calumet City, Oak Forest, Lemont, Orland Park, and Park Forest.or toggle through each period.
Today... Mostly sunny in the morning, then becoming mostly cloudy. Highs in the mid 70s. Southeast winds 5 to 10 mph, increasing to 10 to 15 mph in the afternoon.
Tonight... Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of showers and thunderstorms late. Warmer with lows in the upper 60s. Southeast winds 10 to 15 mph, increasing to south 15 to 20 mph after midnight. Chance of precipitation 20%.
Tuesday... Mostly cloudy. Showers likely with a chance of thunderstorms early in the morning, then a chance of showers with a slight chance of thunderstorms in the late morning and afternoon. More humid with highs in the lower 80s. Southwest winds 10 to 15 mph with gusts up to 25 mph, becoming west in the afternoon. Chance of precipitation 60%.
Tuesday Night... Showers likely with a chance of thunderstorms. Lows in the mid 60s. North winds around 5 mph. Chance of precipitation 70%.
Wednesday... Mostly cloudy. Showers likely in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the mid 70s. Northeast winds 5 to 10 mph. Chance of precipitation 70%.
Wednesday Night... Mostly cloudy. A slight chance of showers in the evening, then showers likely with a slight chance of thunderstorms after midnight. Near steady temperature in the lower 70s. Chance of precipitation 60%.
Thursday... Mostly cloudy. Showers likely in the morning, then a slight chance of showers and thunderstorms in the afternoon. Highs around 80. Chance of precipitation 60%.
Thursday Night... Mostly cloudy with a 20% chance of showers. Lows in the mid 60s.
Friday... Mostly cloudy with a 30% chance of showers. Highs in the upper 70s.
Friday Night... Mostly cloudy with a 50% chance of showers. Lows in the mid 60s.
Saturday... Mostly cloudy with showers likely. Highs in the upper 70s. Chance of precipitation 60%.
Saturday Night... Mostly cloudy with a chance of showers. Lows in the lower 60s. Chance of precipitation 50%.
POP = Probability of Precipitation
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