Weather forecast for: Ottawa IL
Last Update: 1:35 pm CDT Sep 8, 2026
Tonight: A 30 percent chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 70. South southeast wind 5 to 10 mph becoming southwest after midnight. Winds could gust as high as 15 mph.
Wednesday: Showers and thunderstorms, mainly before 10am. High near 81. West southwest wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night: Mostly cloudy, with a low around 64. West northwest wind around 5 mph, with gusts as high as 10 mph.
Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 80. North wind 5 to 10 mph.
Thursday Night: Mostly clear, with a low around 54. North wind around 5 mph becoming east southeast after midnight.
Friday: Sunny, with a high near 80.
Friday Night: Mostly clear, with a low around 65.
Saturday: A chance of showers after 1pm. Partly sunny, with a high near 87.
Saturday Night: A chance of showers before 1am. Partly cloudy, with a low around 64.
Sunday: A chance of showers. Partly sunny, with a high near 82.
Sunday Night: A chance of showers. Mostly cloudy, with a low around 64.
Monday: A chance of showers. Partly sunny, with a high near 84.
Monday Night: Showers likely. Mostly cloudy, with a low around 66.
Tuesday: Partly sunny, with a high near 80.
WeatherWorld.com
City of Ottawa, IL
