Weather forecast for: Marengo IL
Last Update: 9:06 am CDT Sep 15, 2026
Today: Showers and thunderstorms, mainly before 1pm. High near 76. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tonight: Isolated showers and thunderstorms before 7pm, then a slight chance of showers after midnight. Mostly cloudy, with a low around 59. West northwest wind around 5 mph becoming north northeast after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 20%.
Wednesday: A 30 percent chance of showers, mainly between 1pm and 4pm. Mostly cloudy, with a high near 72. East wind around 5 mph, with gusts as high as 15 mph.
Wednesday Night: A 50 percent chance of showers and thunderstorms, mainly after 7pm. Mostly cloudy, with a low around 62. East wind around 5 mph becoming calm in the evening. Winds could gust as high as 10 mph.
Thursday: A 50 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 77. Calm wind becoming north around 5 mph in the morning. Winds could gust as high as 10 mph.
Thursday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 60.
Friday: A 40 percent chance of showers. Partly sunny, with a high near 76.
Friday Night: A chance of showers. Mostly cloudy, with a low around 62.
Saturday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80.
Saturday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 60.
Sunday: A chance of showers. Mostly cloudy, with a high near 72.
Sunday Night: Mostly cloudy, with a low around 54.
Monday: Partly sunny, with a high near 70.
WeatherWorld.com
City of Marengo, IL
