Current conditions at
Sparta, Sparta / Fort McCoy Airport (KCMY)
Lat: 43.96°NLon: 90.74°WElev: 837ft.
Fair
78°F
26°C
| Humidity | 38% |
| Wind Speed | Calm |
| Barometer | 30.15 in (1021.2 mb) |
| Dewpoint | 51°F (11°C) |
| Visibility | 10.00 mi |
| Heat Index | 79°F (26°C) |
| Last update | 23 Jun 12:55 pm CDT |
Extended Forecast for
Ontario WI
This Afternoon

High: 78 °F
Mostly Sunny
Tonight
Low: 59 °F
Chance
T-storms then
ShowersWednesday

High: 79 °F
Showers
LikelyWednesday Night
Low: 54 °F
Chance
Showers then
Partly CloudyThursday

High: 76 °F
Mostly Sunny
Thursday Night

Low: 54 °F
Partly Cloudy
Friday

High: 78 °F
Mostly Sunny
Friday Night

Low: 57 °F
Partly Cloudy
Saturday

High: 82 °F
Mostly Sunny
Detailed Forecast
This Afternoon
Mostly sunny, with a high near 78. South wind 3 to 5 mph.
Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Low around 59. South wind around 5 mph becoming calm. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Showers and thunderstorms likely before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Cloudy, then gradually becoming mostly sunny, with a high near 79. Southwest wind around 7 mph becoming west in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A 30 percent chance of showers before 7pm. Partly cloudy, with a low around 54. Light and variable wind.
Thursday
Mostly sunny, with a high near 76. Calm wind.
Thursday Night
Partly cloudy, with a low around 54. Calm wind.
Friday
Mostly sunny, with a high near 78. Light and variable wind.
Friday Night
Partly cloudy, with a low around 57. Calm wind.
Saturday
Mostly sunny, with a high near 82. Calm wind becoming southeast 5 to 7 mph in the morning.
Saturday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 64. Southeast wind around 7 mph, with gusts as high as 20 mph.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 88. Breezy, with a south wind 8 to 18 mph, with gusts as high as 26 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind 9 to 15 mph, with gusts as high as 26 mph.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Breezy, with a south wind 7 to 17 mph, with gusts as high as 26 mph.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
ABOUT THIS FORECAST
Point Forecast:
Ontario WI
43.73°N 90.58°W
43.73°N 90.58°W
12:31 pm CDT Jun 23, 2026
1pm CDT Jun 23, 2026-6pm CDT Jun 29, 2026


