Weather World
Cottagegrove, IL 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Cottagegrove, IL Weather Forecast
Cottagegrove, IL Weather Forecast Date: 427 AM CDT Sun Sep 20 2026
The area/counties/county of: Saline, including the city of Harrisburg.or toggle through each period.
Today... Mostly sunny. Hot with highs in the upper 90s. West winds 5 to 10 mph.
Tonight... Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the upper 60s. Northwest winds around 5 mph, becoming north after midnight. Chance of rain 40%.
Monday... Partly sunny. A chance of showers in the afternoon. Highs in the upper 80s. North winds 5 to 10 mph. Chance of rain 30%.
Monday Night... Mostly cloudy in the evening, then partly cloudy with a chance of showers after midnight. Lows in the lower 60s. North winds 5 to 10 mph. Chance of rain 30%.
Tuesday... Mostly sunny. Highs in the upper 70s. North winds 10 to 15 mph.
Tuesday Night... Partly cloudy. Lows in the upper 50s. Highs in the mid 70s.
Wednesday... Partly cloudy. Lows in the upper 50s. Highs in the mid 70s.
Wednesday Night... Partly cloudy in the evening, then becoming mostly clear. Lows in the mid 50s.
Thursday... Partly cloudy. Highs in the upper 70s. Lows in the mid 50s.
Friday... Partly cloudy. Highs in the upper 70s. Lows in the mid 50s.
POP = Probability of Precipitation
Cottagegrove Radar Loop
Use the map search tool if you want to place a location marker on the radar map...