Ottawa, IL Weather Forecast

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Ottawa, IL Weather Forecast

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Ottawa IL weather  - Clear - 84°F
Clear
84°F
Updated 6:12 pm
Feels Like 83°F
Humidity 48%
Wind S 12 mph
Barometer  30.04 in
Dew Point 62°F
Ottawa IL weather  - Clear - 29°C
Clear
29°C
Updated 6:12 pm
Feels Like 28°C
Humidity 48%
Wind S 19 km/h
Barometer  101.7 kPa
Dew Point 17°C

Ottawa Weather Forecast

THIS AFTERNOON TONIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT
Ottawa, IL Weather - This Afternoon Partly Cloudy Ottawa, IL Weather - Tonight Chance Of T-Storm Ottawa, IL Weather - Wednesday Chance Of T-Storm Ottawa, IL Weather - Wednesday Night Chance Of Showers Ottawa, IL Weather - Thursday Clearing Ottawa, IL Weather - Thursday Night Clear Ottawa, IL Weather - Friday Sunny Ottawa, IL Weather - Friday Night Chance Of Showers Ottawa, IL Weather - Saturday Chance Of Showers Ottawa, IL Weather - Saturday Night Chance Of Showers Ottawa, IL Weather - Sunday Chance Of Showers Ottawa, IL Weather - Sunday Night Chance Of Showers
Partly Cloudy Chance of T-Storm Chance of T-Storm Chance of Showers Clearing Clear Sunny Chance of Showers Chance of Showers Chance of Showers Chance of Showers Chance of Showers
Hi: 85°FHi: 29°C
Lo: 70°FLo: 21°C Hi: 81°FHi: 27°C
Lo: 65°FLo: 18°C Hi: 80°FHi: 27°C
Lo: 55°FLo: 13°C Hi: 80°FHi: 27°C
Lo: 65°FLo: 18°C Hi: 85°FHi: 29°C
Lo: 65°FLo: 18°C Hi: 81°FHi: 27°C
Lo: 61°FLo: 16°C
POP: 50% POP: 80% POP: 20% POP: 20% POP: 40% POP: 40% POP: 40% POP: 40%
POP = Probability of Precipitation.
Weather Outlook Updated: 120 PM CDT Tue Sep 08 2026 Ottawa, IL Weather - WeatherWorld.com

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Issued: 120 PM CDT Tue Sep 8 2026

Key Messages

  • Showers and a few storms will move across the area late tonight through Wednesday.
  • Thursday and Friday look pleasant.
  • The next opportunities for rain will arrive this weekend and continue into early next week.

Discussion

... Issued at 120 PM CDT Tue Sep 8 2026

Per a recent subjective surface analyses, a 1000 mb surface low pressure system is moving across southern Manitoba well to the north of a surface high pressure system parked along the Atlantic coast. A cold front extends southward...