Current conditions at
Sparta, Sparta / Fort McCoy Airport (KCMY)
Lat: 43.96°NLon: 90.74°WElev: 837ft.
Overcast
31°F
-1°C
| Humidity | 89% |
| Wind Speed | Calm |
| Barometer | 30.00 in (1016.8 mb) |
| Dewpoint | 28°F (-2°C) |
| Visibility | 10.00 mi |
| Last update | 5 Mar 1:55 am CST |
Extended Forecast for
Ontario WI
Overnight

Low: 35 °F
Mostly Cloudy
Thursday

High: 48 °F
Mostly Cloudy
Thursday Night

Low: 38 °F
Mostly Cloudy
Friday

High: 64 °F
Showers
Friday Night

Low: 36 °F
Showers
Saturday
High: 50 °F
Slight Chance
Showers then
Mostly SunnySaturday Night

Low: 31 °F
Mostly Clear
Sunday

High: 61 °F
Sunny
Sunday Night

Low: 42 °F
Mostly Clear
Detailed Forecast
Overnight
Mostly cloudy, with a steady temperature around 35. Calm wind.
Thursday
Mostly cloudy, with a high near 48. East wind 3 to 6 mph.
Thursday Night
Mostly cloudy, with a low around 38. East wind around 5 mph becoming calm.
Friday
Showers, with thunderstorms also possible after 9am. High near 64. Southeast wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Friday Night
Showers and possibly a thunderstorm. Low around 36. South wind 6 to 11 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday
A 20 percent chance of showers before noon. Partly sunny, with a high near 50. Northwest wind 6 to 14 mph, with gusts as high as 24 mph.
Saturday Night
Mostly clear, with a low around 31. Calm wind becoming southwest 5 to 8 mph in the evening. Winds could gust as high as 21 mph.
Sunday
Sunny, with a high near 61. Southwest wind 9 to 15 mph, with gusts as high as 24 mph.
Sunday Night
Mostly clear, with a low around 42. Southwest wind 7 to 9 mph, with gusts as high as 21 mph.
Monday
Sunny, with a high near 67. Southwest wind 6 to 11 mph becoming west in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Partly cloudy, with a low around 37. Light and variable wind becoming east around 6 mph after midnight.
Tuesday
Showers likely. Mostly sunny, with a high near 58. East wind 6 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Tuesday Night
Rain and snow showers likely. Mostly cloudy, with a low around 27. Northeast wind around 9 mph becoming northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 60%.
Wednesday
A chance of rain and snow showers. Partly sunny, with a high near 45. Northwest wind 9 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.
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
12:26 am CST Mar 5, 2026
2am CST Mar 5, 2026-6pm CDT Mar 11, 2026


