Weather forecast for: Marengo IL
Last Update: 7:41 am CDT Sep 17, 2026
Today: Showers and possibly a thunderstorm before 11am, then a slight chance of showers between 11am and noon. Patchy fog before 10am. High near 74. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight: Mostly cloudy, with a low around 60. Northeast wind around 5 mph, with gusts as high as 15 mph.
Friday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 74. East wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 62. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Saturday: Showers and possibly a thunderstorm. High near 80. South southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Saturday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61. Chance of precipitation is 70%.
Sunday: A 40 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 68.
Sunday Night: A chance of showers after 1am. Mostly cloudy, with a low around 54.
Monday: Showers likely, mainly before 1pm. Cloudy, with a high near 64.
Monday Night: Mostly cloudy, with a low around 50.
Tuesday: Mostly cloudy, with a high near 66.
Tuesday Night: Mostly cloudy, with a low around 52.
Wednesday: Mostly sunny, with a high near 71.
WeatherWorld.com
City of Marengo, IL
