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 84.
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: May 27, 2026 10:10 PM CDT.
The active forecast window currently covers May 30 to Jun 3, 2026 for Ottawa, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 30 to Jun 3, 2026
- Latest sync
- May 27, 2026 10:10 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Ottawa
Saturday looks like the warmest upcoming period in Ottawa at 84 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Saturday at about 5 to 10 mph ENE.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- May 27, 2026 10:10 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 58.
Mostly sunny, with a high near 82.
Partly cloudy, with a low around 57.
A slight chance of rain showers between 7am and 1pm. Mostly sunny, with a high near 82.
Mostly clear, with a low around 56.
Sunny, with a high near 80.
Mostly clear, with a low around 55.
Sunny, with a high near 82.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
May 30
|
Sunny
|
84°F |
5 to 10 mph
ENE
|
|
Saturday Night
May 30
|
Mostly Clear
|
58°F |
5 to 10 mph
E
|
|
Sunday
May 31
|
Mostly Sunny
|
82°F |
5 mph
E
|
|
Sunday Night
May 31
|
Partly Cloudy
|
57°F |
0 to 5 mph
ENE
|
|
Monday
Jun 1
|
Slight Chance Rain Showers
|
82°F |
0 to 10 mph
NNE
|
|
Monday Night
Jun 1
|
Mostly Clear
|
56°F |
5 to 10 mph
NE
|
|
Tuesday
Jun 2
|
Sunny
|
80°F |
5 to 10 mph
NE
|
|
Tuesday Night
Jun 2
|
Mostly Clear
|
55°F |
5 to 10 mph
ENE
|
|
Wednesday
Jun 3
|
Sunny
|
82°F |
5 to 10 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Ottawa.
