Ottawa, IL Weather Forecast

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Ottawa, IL Weather Forecast

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Ottawa IL weather  - Clear - 53°F
Clear
53°F
Updated 1:21 am
Feels Like 51°F
Humidity 87%
Wind NE 5 mph
Barometer  30.12 in
Dew Point 50°F
Ottawa IL weather  - Clear - 12°C
Clear
12°C
Updated 1:21 am
Feels Like 10°C
Humidity 87%
Wind NE 8 km/h
Barometer  101.9 kPa
Dew Point 10°C

Ottawa Weather Forecast

REST OF TONIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY
Ottawa, IL Weather - Rest Of Tonight Partly Cloudy Ottawa, IL Weather - Sunday Partly Cloudy Ottawa, IL Weather - Sunday Night Partly Cloudy Ottawa, IL Weather - Monday Partly Cloudy Ottawa, IL Weather - Monday Night Mostly Clear Ottawa, IL Weather - Tuesday Partly Cloudy Ottawa, IL Weather - Tuesday Night Chance Of T-Storm Ottawa, IL Weather - Wednesday Chance Of Showers Ottawa, IL Weather - Wednesday Night Showers Likely Ottawa, IL Weather - Thursday Showers Ottawa, IL Weather - Thursday Night Chance Of Showers Ottawa, IL Weather - Friday Chance Of Showers
Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Mostly Clear Partly Cloudy Chance of T-Storm Chance of Showers Showers Likely Showers Chance of Showers Chance of Showers
Lo: 50°FLo: 10°C Hi: 71°FHi: 22°C
Lo: 49°FLo: 9°C Hi: 75°FHi: 24°C
Lo: 55°FLo: 13°C Hi: 75°FHi: 24°C
Lo: 61°FLo: 16°C Hi: 71°FHi: 22°C
Lo: 61°FLo: 16°C Hi: 71°FHi: 22°C
Lo: 59°FLo: 15°C Hi: 69°FHi: 21°C
POP: 50% POP: 50% POP: 60% POP: 70% POP: 50% POP: 40%
POP = Probability of Precipitation.
Weather Outlook Updated: 951 PM CDT Sat Sep 26 2026 Ottawa, IL Weather - WeatherWorld.com

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Ottawa Forecast Discussion

Meteorlogic Glosserator
Instant definitions for any meteorological term.

Issued: 1242 AM CDT Sun Sep 27 2026

Key Messages

  • Seasonable temperatures for late September are expected over the next several days.
  • The next chances for widespread rainfall are forecasted to come mid to late next week.

Discussion

... Issued at 203 PM CDT Sat Sep 26 2026

A ridge of high pressure continues to reside over the Great Lakes in between the Nor`easter off the east coast and the broad troughing over the Pacific Northwest and Mountain West regions. This ridge is expected to remain in place through at least Monday which will ke...