Current conditions at
Sparta, Sparta / Fort McCoy Airport (KCMY)
Lat: 43.96°NLon: 90.74°WElev: 837ft.
A Few Clouds
51°F
11°C
| Humidity | 96% |
| Wind Speed | Calm |
| Barometer | 30.14 in (1020.9 mb) |
| Dewpoint | 50°F (10°C) |
| Visibility | 10.00 mi |
| Last update | 22 Jun 11:55 pm CDT |
Extended Forecast for
Ontario WI
Overnight

Low: 52 °F
Partly Cloudy
Tuesday

High: 79 °F
Increasing
CloudsTuesday Night
Low: 59 °F
Showers
Likely then
ShowersWednesday

High: 79 °F
Showers
LikelyWednesday Night

Low: 54 °F
Partly Cloudy
Thursday

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
Detailed Forecast
Overnight
Partly cloudy, with a low around 52. Calm wind.
Tuesday
Increasing clouds, with a high near 79. Calm wind.
Tuesday Night
Showers and thunderstorms before 4am, then showers and possibly a thunderstorm, mainly after 4am. Low around 59. Light south wind. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
Showers and thunderstorms likely before noon, then showers likely and possibly a thunderstorm between noon and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 79. West wind 3 to 7 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Partly cloudy, with a low around 54. Light north 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 afternoon.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Southeast wind 5 to 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
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ABOUT THIS FORECAST
Point Forecast:
Ontario WI
43.73°N 90.58°W
43.73°N 90.58°W
12:16 am CDT Jun 23, 2026
12am CDT Jun 23, 2026-6pm CDT Jun 29, 2026


