Ontario, WI Weather Forecast
Local 7-day forecast
Mostly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Ontario, WI in one place.
Mostly cloudy. Low around 45, with temperatures rising to around 47 overnight. East wind around 5 mph.
Local Weather Overview
This forecast page for Ontario, WI 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 15, 2026 4:54 AM CDT.
The active forecast window currently covers Oct 15 to Oct 21, 2026 for Ontario, WI.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 15 to Oct 21, 2026
- Latest sync
- Oct 15, 2026 4:54 AM CDT
- Forecast office
- ARX
- Source
- NOAA / NWS
Daily Outlook
This Week in Ontario
Wednesday looks like the warmest upcoming period in Ontario at 69 degrees F.
Friday Night is the coolest period ahead with temperatures near 28 degrees F.
The strongest winds are forecast for Friday at about 14 to 20 mph NW.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 15, 2026 4:54 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- ARX
- Radar station
- KARX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Rain showers after 9am. Cloudy, with a high near 55. East wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Rain showers. Mostly cloudy, with a low around 41. Northwest wind 6 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Rain showers likely before noon. Mostly cloudy, with a high near 50. Northwest wind 14 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Widespread frost after 10pm. Mostly clear, with a low around 28. North wind 0 to 13 mph, with gusts as high as 23 mph. New rainfall amounts less than a tenth of an inch possible.
Widespread frost before 9am. Sunny, with a high near 57. West wind 0 to 13 mph, with gusts as high as 22 mph.
Clear, with a low around 37. Southwest wind 8 to 12 mph, with gusts as high as 24 mph.
Sunny, with a high near 64. Southwest wind 13 to 17 mph, with gusts as high as 26 mph.
Mostly clear, with a low around 39. Southwest wind 1 to 12 mph, with gusts as high as 24 mph.
Mostly sunny, with a high near 67. Southwest wind 0 to 3 mph.
Partly cloudy, with a low around 39. Southwest wind around 1 mph.
Sunny, with a high near 68. Southeast wind 0 to 3 mph.
Mostly clear, with a low around 42. Southeast wind around 2 mph.
Mostly sunny, with a high near 69. South wind 2 to 9 mph, with gusts as high as 18 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Oct 15
|
Mostly Cloudy
|
45°F |
5 mph
E
|
|
Thursday
Oct 15
|
Rain Showers
|
55°F |
5 mph
E
|
|
Thursday Night
Oct 15
|
Rain Showers
|
41°F |
6 to 15 mph
NW
|
|
Friday
Oct 16
|
Rain Showers Likely then Mostly Cloudy
|
50°F |
14 to 20 mph
NW
|
|
Friday Night
Oct 16
|
Widespread Frost
|
28°F |
0 to 13 mph
N
|
|
Saturday
Oct 17
|
Widespread Frost then Sunny
|
57°F |
0 to 13 mph
W
|
|
Saturday Night
Oct 17
|
Clear
|
37°F |
8 to 12 mph
SW
|
|
Sunday
Oct 18
|
Sunny
|
64°F |
13 to 17 mph
SW
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
39°F |
1 to 12 mph
SW
|
|
Monday
Oct 19
|
Mostly Sunny
|
67°F |
0 to 3 mph
SW
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
39°F |
1 mph
SW
|
|
Tuesday
Oct 20
|
Sunny
|
68°F |
0 to 3 mph
SE
|
|
Tuesday Night
Oct 20
|
Mostly Clear
|
42°F |
2 mph
SE
|
|
Wednesday
Oct 21
|
Mostly Sunny
|
69°F |
2 to 9 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Ontario.