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 85. West wind 5 to 15 mph.
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: Oct 12, 2026 12:22 AM CDT.
The active forecast window currently covers Oct 13 to Oct 18, 2026 for Ottawa, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 13 to Oct 18, 2026
- Latest sync
- Oct 12, 2026 12:22 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Ottawa
Tuesday looks like the warmest upcoming period in Ottawa at 85 degrees F.
Friday Night is the coolest period ahead with temperatures near 37 degrees F.
The strongest winds are forecast for Friday at about 15 to 20 mph NW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 12, 2026 12:22 AM CDT
- Coverage
- 6 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
Showers and thunderstorms after 7pm. Mostly cloudy, with a low around 63. North northwest wind 0 to 5 mph. Chance of precipitation is 80%.
Rain showers. Mostly cloudy, with a high near 74. Chance of precipitation is 80%.
A chance of rain showers. Mostly cloudy, with a low around 56.
Rain showers likely before 1pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 69.
Showers and thunderstorms likely. Mostly cloudy, with a low around 51.
A slight chance of rain showers before 7am. Partly sunny, with a high near 61.
Partly cloudy, with a low around 37.
Sunny, with a high near 56.
Mostly clear, with a low around 37.
Sunny, with a high near 63.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Oct 13
|
Sunny
|
85°F |
5 to 15 mph
W
|
|
Tuesday Night
Oct 13
|
Showers And Thunderstorms
|
63°F |
0 to 5 mph
NNW
|
|
Wednesday
Oct 14
|
Rain Showers
|
74°F |
5 to 10 mph
NE
|
|
Wednesday Night
Oct 14
|
Chance Rain Showers
|
56°F |
5 to 10 mph
NE
|
|
Thursday
Oct 15
|
Rain Showers Likely
|
69°F |
5 to 10 mph
E
|
|
Thursday Night
Oct 15
|
Showers And Thunderstorms Likely
|
51°F |
5 to 10 mph
NNE
|
|
Friday
Oct 16
|
Slight Chance Rain Showers then Partly Sunny
|
61°F |
15 to 20 mph
NW
|
|
Friday Night
Oct 16
|
Partly Cloudy
|
37°F |
5 to 15 mph
NW
|
|
Saturday
Oct 17
|
Sunny
|
56°F |
5 mph
NNW
|
|
Saturday Night
Oct 17
|
Mostly Clear
|
37°F |
0 to 5 mph
W
|
|
Sunday
Oct 18
|
Sunny
|
63°F |
5 to 10 mph
SSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Ottawa.
