Hazardous Weather Conditions
Current conditions at
Sparta, Sparta / Fort McCoy Airport (KCMY)
Lat: 43.96°NLon: 90.74°WElev: 837ft.
Overcast
71°F
22°C
| Humidity | 85% |
| Wind Speed | Calm |
| Barometer | 29.94 in (1013.9 mb) |
| Dewpoint | 66°F (19°C) |
| Visibility | 9.00 mi |
| Last update | 25 Jul 8:55 am CDT |
Extended Forecast for
Ontario WI
Extreme Heat Watch July 26, 09:00pm until July 27, 09:00pm
Extreme Heat Warning July 26, 12:00pm until July 26, 09:00pm
Today
High: 86 °F
Decreasing
CloudsTonight
Low: 69 °F
Partly Cloudy
Sunday
High: 93 °F
Mostly Sunny
Sunday Night
Low: 72 °F
Chance
Showers then
Showers
LikelyMonday
High: 93 °F
Mostly Sunny
Monday Night
Low: 67 °F
Mostly Clear
Tuesday
High: 89 °F
Mostly Sunny
Tuesday Night
Low: 64 °F
Mostly Clear
Wednesday
High: 90 °F
Sunny then
Slight Chance
T-storms
Detailed Forecast
Today
Cloudy, then gradually becoming mostly sunny, with a high near 86. Southwest wind 3 to 7 mph.
Tonight
Partly cloudy, with a low around 69. Light southwest wind.
Sunday
Mostly sunny, with a high near 93. Heat index values as high as 106. Light south wind becoming southwest 6 to 11 mph in the morning.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 72. Southwest wind around 6 mph becoming calm after midnight. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
Mostly sunny, with a high near 93. Light southwest wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 21 mph.
Monday Night
Mostly clear, with a low around 67. Northwest wind around 6 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 89. Calm wind becoming northwest around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 64. Calm wind.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 90. Calm wind.
Wednesday Night
Mostly clear, with a low around 64. Calm wind.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. Calm wind.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65. Calm wind.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89. Light west wind.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Ontario WI
43.73°N 90.58°W
43.73°N 90.58°W
8:52 am CDT Jul 25, 2026
9am CDT Jul 25, 2026-6pm CDT Jul 31, 2026
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