Ontario, IL Weather Forecast
Local 7-day forecast
Sunny then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Ontario, IL in one place.
A chance of showers and thunderstorms after 3pm. Sunny, with a high near 91. West wind around 12 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for Ontario, 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 17, 2026 5:04 PM CDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for Ontario, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 5:04 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Ontario
Saturday looks like the warmest upcoming period in Ontario at 91 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 60 degrees F.
The strongest winds are forecast for Tuesday at about 9 to 17 mph NW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 5:04 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KDVN
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 66. North northeast wind 5 to 9 mph, with gusts as high as 16 mph. New rainfall amounts less than a tenth of an inch possible.
Sunny, with a high near 86. East wind 3 to 7 mph.
Mostly clear, with a low around 68. Southeast wind around 6 mph.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 91. South southwest wind 7 to 12 mph, with gusts as high as 20 mph. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms. Mostly clear, with a low around 74. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 7am. Sunny, with a high near 87. Chance of precipitation is 50%.
Mostly clear, with a low around 63.
Sunny, with a high near 80.
Mostly clear, with a low around 60.
Sunny, with a high near 81.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 60.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Sunny then Chance Showers And Thunderstorms
|
91°F |
12 mph
W
|
|
Saturday Night
Jul 18
|
Partly Cloudy
|
66°F |
5 to 9 mph
NNE
|
|
Sunday
Jul 19
|
Sunny
|
86°F |
3 to 7 mph
E
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
68°F |
6 mph
SE
|
|
Monday
Jul 20
|
Sunny then Slight Chance Showers And Thunderstorms
|
91°F |
7 to 12 mph
SSW
|
|
Monday Night
Jul 20
|
Chance Showers And Thunderstorms
|
74°F |
9 to 13 mph
SW
|
|
Tuesday
Jul 21
|
Chance Showers And Thunderstorms then Sunny
|
87°F |
9 to 17 mph
NW
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
63°F |
8 to 16 mph
NNW
|
|
Wednesday
Jul 22
|
Sunny
|
80°F |
10 mph
N
|
|
Wednesday Night
Jul 22
|
Mostly Clear
|
60°F |
1 to 7 mph
NNW
|
|
Thursday
Jul 23
|
Sunny
|
81°F |
3 mph
WNW
|
|
Thursday Night
Jul 23
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
60°F |
3 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Ontario.