Sparta, WI 54656 Weather

Monroe County10:20 PM CDT43.95°N, 90.81°W

Current conditions

Clear
42°
Clear
Feels like 42°
High 71° Wednesday·Low 43° tonight
WindCalm
Humidity91%
Dew point39°
Pressure30.28 inHg
Visibility10.0 mi
Cloud cover3%
UV index0 Low
Sunrise7:25 AM
Sunset6:13 PM

Observed at Sparta, Sparta / Fort McCoy Airport · 1 hr ago

Forecast

10-day

  • Tonight

    Clear, with a low around 43. Southeast wind around 1 mph.

  • Wednesday

    Sunny, with a high near 71. Southwest wind around 2 mph.

  • Wednesday Night

    Patchy fog after 10pm. Mostly clear, with a low around 45. Wind around 0 mph.

National Weather Service forecast updated 2 hrs ago.

Hourly

Hourly forecast
  1. Now Clear 48°
  2. 11 PM Clear 47°
  3. Wed12 AM Clear 45°
  4. 1 AM Clear 45°
  5. 2 AM Clear 44°
  6. 3 AM Clear 44°
  7. 4 AM Clear 44°
  8. 5 AM Clear 44°
  9. 6 AM Sunny 43°
  10. 7 AM Sunny 43°
  11. 8 AM Sunny 44°
  12. 9 AM Sunny 50°
  13. 10 AM Sunny 56°
  14. 11 AM Sunny 62°
  15. 12 PM Sunny 65°
  16. 1 PM Sunny 69°
  17. 2 PM Mostly Sunny 71°
  18. 3 PM Sunny 71°
  19. 4 PM Mostly Sunny 71°
  20. 5 PM Mostly Sunny 70°
  21. 6 PM Partly Cloudy 65°
  22. 7 PM Partly Cloudy 61°
  23. 8 PM Partly Cloudy 57°
  24. 9 PM Mostly Clear 55°

10-day forecast

Details
  1. TonightOct 20 Clear Clear43°
  2. WedOct 21 Sunny Sunny45°71°
  3. ThuOct 22 Patchy Fog then Mostly Sunny Patchy Fog then Mostly Sunny49°73°
  4. FriOct 23 Mostly Sunny Mostly Sunny55°70°
  5. SatOct 24 Partly Sunny Partly Sunny18%53°72°
  6. SunOct 25 Slight Chance Rain Showers Slight Chance Rain Showers28%44°64°
  7. MonOct 26 Chance Rain Showers Chance Rain Showers28%38°57°
  8. TueOct 27 Mostly Sunny Mostly Sunny12%54°
  9. WedOct 28 Mostly sunny Mostly sunny29°49°
  10. ThuOct 29 Cloudy Cloudy32°54°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
Open the National Weather Service radar (the map here needs JavaScript).

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Air quality

23
Good
Fine particles (PM2.5)

Air quality is satisfactory, and air pollution poses little or no risk.

Forecast

  • TueGood
  • WedModerate
  • ThuModerate

Driftless Area North, WI reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:25 AM
Sunset 6:13 PM
Daylight 10 h 48 min (−2 min 53 s tomorrow)
Waxing Gibbous · 74% lit
Moonrise 3:40 PM Moonset 1:10 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Record high80° (2024)
Record low21° (2018)
Wettest0.08 in (2025)
Month to date1.26 in (normal 0.00 in)

Sparta Fort Mccoy, records since 2013. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in ARX, issued 16 hrs ago

Key Messages

- Unseasonably warm into the weekend.

- Dry through Thursday night and then maybe some small rain chances from Friday into the weekend.

- Much uncertainty on temperatures and rain chances early next week.

Discussion

Issued at 1146 PM CDT Mon Oct 19 2026

Today through Thursday night

An anomalous 500 mb ridge will remain in control of the area's weather through Thursday night. This high will provide dry weather and unseasonably warm temperatures. High temperatures will warm from the mid- and upper 60s today and be in the lower and mid-70s on Thursday. Low temperatures will be in the 30s and 40s tonight and Wednesday night and in the 40s and 50s on Thursday night.

Friday and Friday night

A negatively tilted trough will move through Minnesota and western and northern Wisconsin. There is still plenty of uncertainty on whether there will be enough low-level moisture for any rain to move into our area.

With some more cover, high temperatures will be a bit cooler (mainly in the 60s). Low temperatures will be a bit warmer (upper 40s to mid-50s).

Aviation

Issued at 600 AM CDT Tue Oct 20 2026

Valley fog has developed overnight and is currently impacting ONA/PDC/OVS with issues seen on all side of LSE but seemingly not within 5 nautical miles. In any case, still prudent to carry a TEMPO at LSE given how close the issues are to impacting the terminal. Once the fog dissipates around 14-15z, VFR conditions will return. Fog may develop once again Wednesday morning primarily impacting the Wisconsin River valley and OVS while low level winds may be too strong for this to impact LSE once again so have kept it out of the TAF near the end of the period.

Arx Watches

WI...None. MN...None. IA...None.

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.