Ottawa, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Ottawa, IL in one place.
Sunny, with a high near 91.
Local Weather Overview
This forecast page for Ottawa, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jul 11, 2026 11:51 PM CDT.
The active forecast window currently covers Jul 14 to Jul 18, 2026 for Ottawa, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 14 to Jul 18, 2026
- Latest sync
- Jul 11, 2026 11:51 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Ottawa
Tuesday looks like the warmest upcoming period in Ottawa at 91 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 72 degrees F.
The strongest winds are forecast for Saturday at about 5 to 10 mph SW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 11, 2026 11:51 PM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 72.
Sunny, with a high near 91.
Mostly clear, with a low around 72.
Sunny, with a high near 90.
Partly cloudy, with a low around 72.
A chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 90.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 72.
A slight chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 89.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Jul 14
|
Sunny
|
91°F |
0 mph
|
|
Tuesday Night
Jul 14
|
Mostly Clear
|
72°F |
0 mph
|
|
Wednesday
Jul 15
|
Sunny
|
91°F |
0 to 5 mph
W
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
72°F |
0 to 5 mph
WSW
|
|
Thursday
Jul 16
|
Sunny
|
90°F |
0 to 5 mph
SW
|
|
Thursday Night
Jul 16
|
Partly Cloudy
|
72°F |
5 mph
SSW
|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
90°F |
5 mph
WSW
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms then Partly Cloudy
|
72°F |
5 mph
SW
|
|
Saturday
Jul 18
|
Slight Chance Showers And Thunderstorms
|
89°F |
5 to 10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Ottawa.
