Ontario, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Ontario, IL in one place.
Sunny, with a high near 83. Southeast wind 5 to 8 mph.
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: Jun 2, 2026 3:40 AM CDT.
The active forecast window currently covers Jun 3 to Jun 8, 2026 for Ontario, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 3 to Jun 8, 2026
- Latest sync
- Jun 2, 2026 3:40 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Ontario
Sunday looks like the warmest upcoming period in Ontario at 88 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 58 degrees F.
The strongest winds are forecast for Thursday at about 7 to 14 mph SSW.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 2, 2026 3:40 AM 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
Mostly clear, with a low around 58. South wind 5 to 9 mph, with gusts as high as 17 mph.
Mostly sunny, with a high near 87. South southwest wind 7 to 14 mph, with gusts as high as 21 mph.
Partly cloudy, with a low around 65. South southwest wind 9 to 14 mph, with gusts as high as 22 mph.
A slight chance of rain showers between 7am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 1am, then showers and thunderstorms likely. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Showers and thunderstorms likely before 7am, then a chance of showers and thunderstorms. Partly sunny, with a high near 87.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 66.
A chance of showers and thunderstorms. Partly sunny, with a high near 88.
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
A chance of showers and thunderstorms. Partly sunny, with a high near 88.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Jun 3
|
Sunny
|
83°F |
5 to 8 mph
SE
|
|
Wednesday Night
Jun 3
|
Mostly Clear
|
58°F |
5 to 9 mph
S
|
|
Thursday
Jun 4
|
Mostly Sunny
|
87°F |
7 to 14 mph
SSW
|
|
Thursday Night
Jun 4
|
Partly Cloudy
|
65°F |
9 to 14 mph
SSW
|
|
Friday
Jun 5
|
Slight Chance Rain Showers then Chance Showers And Thunderstorms
|
87°F |
9 to 13 mph
SSW
|
|
Friday Night
Jun 5
|
Chance Showers And Thunderstorms
|
65°F |
7 to 13 mph
SSW
|
|
Saturday
Jun 6
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
87°F |
9 mph
SW
|
|
Saturday Night
Jun 6
|
Chance Showers And Thunderstorms
|
66°F |
7 mph
SSW
|
|
Sunday
Jun 7
|
Chance Showers And Thunderstorms
|
88°F |
5 to 9 mph
SE
|
|
Sunday Night
Jun 7
|
Chance Showers And Thunderstorms
|
66°F |
8 mph
ESE
|
|
Monday
Jun 8
|
Chance Showers And Thunderstorms
|
88°F |
8 to 12 mph
ESE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Ontario.