Weather forecast for: Cortland IL
Last Update: 9:11 pm CDT Sep 14, 2026
Tonight: A chance of showers and thunderstorms between 2am and 4am, then showers and possibly a thunderstorm after 4am. Temperature rising to around 67 by 3am. South southeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday: Showers and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms after 10am. High near 77. South wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 60. Northwest wind 5 to 10 mph becoming north northeast after midnight. Chance of precipitation is 40%.
Wednesday: A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 71. East wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 60%.
Wednesday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. East wind around 5 mph becoming calm after midnight. Chance of precipitation is 60%.
Thursday: Showers likely and possibly a thunderstorm before 1pm. Mostly cloudy, with a high near 78. Chance of precipitation is 60%.
Thursday Night: A 30 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 63.
Friday: A chance of showers. Mostly cloudy, with a high near 80.
Friday Night: A chance of showers. Partly cloudy, with a low around 66.
Saturday: A chance of showers. Mostly sunny, with a high near 82.
Saturday Night: A chance of showers. Mostly cloudy, with a low around 63.
Sunday: A chance of showers. Mostly cloudy, with a high near 77.
Sunday Night: A chance of showers. Mostly cloudy, with a low around 58.
Monday: A chance of showers. Partly sunny, with a high near 74.
WeatherWorld.com
