National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Sparta, Sparta / Fort McCoy Airport (KCMY)

Lat: 43.96°NLon: 90.74°WElev: 837ft.

Overcast

49°F

9°C

Humidity 83%
Wind Speed Calm
Barometer 30.19 in (1022.9 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 20 May 12:55 am CDT
Extended Forecast for

Tomah WI

  • Overnight

    Overnight: Mostly cloudy, then gradually becoming mostly clear, with a low around 40. Light northwest wind.

    Low: 40 °F

    Decreasing
    Clouds

  • Wednesday

    Wednesday: Increasing clouds, with a high near 63. Calm wind becoming north around 5 mph.

    High: 63 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 40. Calm wind becoming east around 5 mph after midnight.

    Low: 40 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 63. East wind 6 to 9 mph.

    High: 63 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 42. East wind around 6 mph.

    Low: 42 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 64. East wind 7 to 13 mph, with gusts as high as 22 mph.

    High: 64 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely. Mostly cloudy, with a low around 45. East wind 6 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.

    Low: 45 °F

    Showers
    Likely

  • Saturday

    Saturday: A 20 percent chance of showers. Mostly cloudy, with a high near 69. East wind around 5 mph.

    High: 69 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 49. Calm wind.

    Low: 49 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, then gradually becoming mostly clear, with a low around 40. Light northwest wind.
Wednesday
Increasing clouds, with a high near 63. Calm wind becoming north around 5 mph.
Wednesday Night
Mostly cloudy, with a low around 40. Calm wind becoming east around 5 mph after midnight.
Thursday
Partly sunny, with a high near 63. East wind 6 to 9 mph.
Thursday Night
Mostly cloudy, with a low around 42. East wind around 6 mph.
Friday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 64. East wind 7 to 13 mph, with gusts as high as 22 mph.
Friday Night
Showers likely. Mostly cloudy, with a low around 45. East wind 6 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.
Saturday
A 20 percent chance of showers. Mostly cloudy, with a high near 69. East wind around 5 mph.
Saturday Night
Mostly cloudy, with a low around 49. Calm wind.
Sunday
Partly sunny, with a high near 78. Calm wind becoming west around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 51. Calm wind.
Memorial Day
Mostly sunny, with a high near 84. Calm wind becoming south around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 56. Calm wind.
Tuesday
Mostly sunny, with a high near 87. Calm wind becoming south around 6 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Tomah WI
 43.99°N 90.51°W
Last Update:
1:26 am CDT May 20, 2026
Forecast Valid:
1am CDT May 20, 2026-6pm CDT May 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation