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City of Ottawa, ILOttawa, IL 7-Day Weather Forecast
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Ottawa Weather Forecast
Ottawa, IL Weather Forecast Date: 841 PM CDT Wed Sep 09 2026
Weather forecast for Ottawa, IL
Tonight Lo: 65°F Lo: 18°C |
Tonight... Partly cloudy in the evening, then becoming mostly cloudy. Patchy fog after midnight. Lows in the mid 60s. Southwest winds around 5 mph, becoming northwest after midnight. |
Thu Hi: 79°FHi: 26°C Lo: 51°F Lo: 11°C |
Thursday... Mostly cloudy. Patchy fog early in the morning. A slight chance of showers in the morning. Highs in the upper 70s. North winds around 5 mph. Chance of precipitation 20%. |
Fri Hi: 80°FHi: 27°C Lo: 61°F Lo: 16°C |
Friday... Sunny. Highs around 80. Southeast winds 5 to 10 mph. |
Sat Hi: 85°FHi: 29°C Lo: 61°F Lo: 16°C |
Saturday... Partly cloudy. Highs in the mid 80s. |
Sun Hi: 81°FHi: 27°C Lo: 65°F Lo: 18°C |
Sunday... Partly cloudy with a slight chance of showers in the morning, then mostly cloudy in the afternoon. Highs in the lower 80s. Chance of precipitation 20%. |
| Mon Hi: 89°FHi: 32°C Lo: 69°F Lo: 21°C |
Monday... Partly cloudy with a chance of showers. Highs in the upper 80s. Chance of precipitation 40%. |
| Tue Hi: 81°FHi: 27°C Lo: 61°F Lo: 16°C |
Tuesday... Mostly cloudy. A chance of showers in the afternoon. Highs in the lower 80s. Chance of precipitation 30%. |
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