Current conditions at
Sparta, Sparta / Fort McCoy Airport (KCMY)
Lat: 43.96°NLon: 90.74°WElev: 837ft.
Mostly Cloudy
77°F
25°C
| Humidity | 40% |
| Wind Speed | Calm |
| Barometer | 30.13 in (1020.6 mb) |
| Dewpoint | 51°F (11°C) |
| Visibility | 10.00 mi |
| Heat Index | 78°F (26°C) |
| Last update | 23 Jun 2:55 pm CDT |
Extended Forecast for
Ontario WI
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
Mostly Clear
Friday

High: 78 °F
Mostly Sunny
Friday Night

Low: 56 °F
Partly Cloudy
Saturday

High: 82 °F
Mostly Sunny
Saturday Night

Low: 63 °F
Chance
T-storms
Detailed Forecast
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, mainly before 2pm, then showers likely and possibly a thunderstorm after 5pm. Cloudy through mid morning, then gradual clearing, 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 quarter and half of an inch possible.
Wednesday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 11pm. Partly cloudy, with a low around 54. Light north wind. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 76. Light northwest wind.
Thursday Night
Mostly clear, with a low around 54. Calm wind.
Friday
Mostly sunny, with a high near 78. Calm wind becoming east around 5 mph.
Friday Night
Partly cloudy, with a low around 56. Calm wind.
Saturday
Mostly sunny, with a high near 82. Calm wind becoming southeast 5 to 7 mph in the morning.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 63. Southeast wind around 7 mph, with gusts as high as 20 mph.
Sunday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87. Breezy, with a southeast wind 8 to 16 mph, with gusts as high as 25 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind 7 to 14 mph, with gusts as high as 24 mph.
Monday
Mostly sunny, with a high near 92. South wind 7 to 15 mph, with gusts as high as 24 mph.
Monday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70. South wind 6 to 13 mph, with gusts as high as 23 mph.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. Southwest wind 5 to 8 mph.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Ontario WI
43.73°N 90.58°W
43.73°N 90.58°W
1:26 pm CDT Jun 23, 2026
3pm CDT Jun 23, 2026-6pm CDT Jun 30, 2026


