Weather World
Clear Lake, MO 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Clear Lake, MO Weather Forecast
Clear Lake, MO Weather Forecast Date: 238 PM CDT Wed Sep 16 2026
The area/counties/county of: Madison County Il, including the cities of: Alton, Edwardsville, Belleville, Cahokia, Saint Charles, and Saint Louis.or toggle through each period.
Tonight... Mostly cloudy with scattered thunderstorms with a slight chance of showers this evening, then mostly clear after midnight. Lows in the mid 70s. South winds around 5 mph. Chance of rain 40%.
Thursday... Sunny, hot with highs in the upper 90s. West winds around 5 mph. Heat index values up to 107.
Thursday Night... Mostly clear. Humid with lows in the lower 70s. Northeast winds around 5 mph. Heat index values up to 102 early in the evening.
Friday... Sunny, hot with highs in the mid 90s. East winds around 5 mph, becoming south in the afternoon. Heat index values up to 105 in the afternoon.
Friday Night... Mostly clear. Lows in the lower 70s. Southeast winds around 5 mph. Heat index values up to 100 early in the evening.
Saturday... Mostly sunny. Hot with highs in the upper 90s.
Saturday Night... Partly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the lower 70s. Highs in the lower 90s. Chance of rain 40%.
Sunday... Partly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the lower 70s. Highs in the lower 90s. Chance of rain 40%.
Sunday Night... Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of thunderstorms in the evening. A slight chance of showers. Lows in the upper 60s. Chance of rain 20%.
Monday... Partly sunny. A slight chance of showers in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 40%.
Monday Night... Mostly cloudy with a chance of showers in the evening, then partly cloudy with a slight chance of showers after midnight. Lows in the mid 60s. Chance of rain 40%.
Tuesday... Partly cloudy with a 20% chance of showers. Highs in the lower 80s. Lows in the lower 60s.
POP = Probability of Precipitation
Clear Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...