| NWS Forecast for: Ottawa IL Issued by: National Weather Service Chicago, IL Last Update: 3:10 am CDT Sep 11, 2026 | |
| Today: Patchy fog before 8am. Otherwise, sunny, with a high near 28. East wind 5 to 10 km/h becoming south southeast in the afternoon. Tonight: Partly cloudy, with a low around 18. Calm wind. Saturday: Mostly sunny, with a high near 30. South wind 5 to 15 km/h becoming west in the afternoon. Winds could gust as high as 25 km/h. Saturday Night: Partly cloudy, with a low around 16. West northwest wind 5 to 10 km/h becoming north after midnight. Sunday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 27. North northeast wind around 10 km/h, with gusts as high as 20 km/h. Sunday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 16. Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 29. Monday Night: A chance of showers after 1am. Partly cloudy, with a low around 21. Tuesday: A chance of showers. Partly sunny, with a high near 29. Tuesday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 17. Wednesday: Showers likely. Mostly cloudy, with a high near 27. Wednesday Night: Showers likely. Mostly cloudy, with a low around 18. Thursday: A chance of showers. Partly sunny, with a high near 28. | |
| Ottawa IL 41.35°N 88.85°W | |
Visit your local NWS office at: https://www.weather.gov/lot |