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Sullivan, WI Weather

It is 52°F and cloudy in Sullivan, WI, observed at 12:35 AM CDT. Today: Rain Showers Likely, high 59°F, low 47°F. Hourly and 10-day forecast from the National Weather Service. Times are local (CDT).

Sullivan, WI current weather

52°F

Cloudy

H 59° / L 47°Feels like 52°

Observed at Waukesha County Airport (17.6 mi away), 10/31/2026, 12:35 AM CDT

Hourly forecast

NWS, updated 10/30/2026, 10:56 PM PT

  1. Now48°
  2. 2 AM48°15%
  3. 3 AM48°
  4. 4 AM48°11%
  5. 5 AM48°21%
  6. 6 AM48°25%
  7. 7 AM48°33%
  8. 8 AM50°31%
  9. 9 AM52°23%
  10. 10 AM54°54%
  11. 11 AM56°48%
  12. 12 PM57°50%
  13. 1 PM58°50%
  14. 2 PM58°46%
  15. 3 PM58°64%
  16. 4 PM58°73%
  17. 5 PM57°73%
  18. 6 PM56°58%
  19. 7 PM55°16%
  20. 8 PM54°16%
  21. 9 PM54°
  22. 10 PM53°
  23. 11 PM53°
  24. 12 AM52°Sun
  25. 1 AM52°10%
  26. 1 AM51°
  27. 2 AM50°11%
  28. 3 AM49°12%
  29. 4 AM48°
  30. 5 AM48°11%
  31. 6 AM49°
  32. 7 AM51°
  33. 8 AM54°
  34. 9 AM57°
  35. 10 AM60°
  36. 11 AM62°
  37. 12 PM64°
  38. 1 PM65°
  39. 2 PM65°
  40. 3 PM64°
  41. 4 PM63°12%
  42. 5 PM61°
  43. 6 PM59°
  44. 7 PM59°
  45. 8 PM57°
  46. 9 PM55°
  47. 10 PM54°
  48. 11 PM54°

10-day forecast

Tap a day for details

  • Today10/3173% chance of precipitationLow 47°High 59°

    Saturday: Rain showers likely. Mostly cloudy, with a high near 59. Southeast wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.

    Overnight: A slight chance of rain showers after 2am. Cloudy, with a low around 47. East wind around 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.

    Rain Showers Likely
  • Sun11/112% chance of precipitationLow 50°High 65°

    Sunday: Partly sunny, with a high near 65. Southeast wind 0 to 5 mph.

    Sunday Night: Mostly cloudy, with a low around 50. Southeast wind around 5 mph.

    Partly Sunny
  • Mon11/277% chance of precipitationLow 58°High 65°

    Monday: Rain showers likely. Mostly cloudy, with a high near 65. Southeast wind 5 to 15 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

    Monday Night: Rain showers. Cloudy, with a low around 58. South wind 15 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.

    Rain Showers Likely
  • Tue11/383% chance of precipitationLow 54°High 69°

    Tuesday: Rain showers. Mostly cloudy, with a high near 69. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.

    Tuesday Night: Rain showers likely. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.

    Rain Showers
  • Wed11/449% chance of precipitationLow 48°High 65°

    Wednesday: A chance of rain showers. Mostly cloudy, with a high near 65. Chance of precipitation is 50%.

    Wednesday Night: A chance of rain showers. Mostly cloudy, with a low around 48. Chance of precipitation is 50%.

    Chance Rain Showers
  • Thu11/533% chance of precipitationLow 42°High 62°

    Thursday: A chance of rain showers. Mostly cloudy, with a high near 62. Chance of precipitation is 30%.

    Thursday Night: Mostly cloudy, with a low around 42.

    Chance Rain Showers
  • Fri11/617% chance of precipitationLow High 58°

    Friday: A slight chance of rain showers before noon. Partly sunny. High near 58, with temperatures falling to around 53 in the afternoon. Chance of precipitation is 20%.

    Slight Chance Rain Showers then Partly Sunny
  • Sat11/7Model blendLow 39°High 60°

    Saturday: Partly cloudy. High near 60°. Low that night near 39°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Sun11/8Model blend17% chance of precipitationLow 40°High 59°

    Sunday: Partly cloudy, slight chance of rain. High near 59°. Low that night near 40°. About 0.01 in of precipitation.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

  • Mon11/9Model blend22% chance of precipitationLow 40°High 61°

    Monday: Partly cloudy, slight chance of rain. High near 61°. Low that night near 40°.

    Computer model guidance from the NOAA National Blend of Models, not a forecast written by NWS forecasters. Expect changes this far out.

Forecast for 43.008, -88.591 from the NWS MKX office, updated 10/30/2026, 10:56 PM PT · Official forecast on weather.gov

Days 8 to 10: NOAA National Blend of Models, station KRYV (Watertown Muni, 13 mi), model run 10/30/2026, 9:00 PM CDT

From the National Weather Service; may be delayed. Not for life-safety decisions. In an emergency, call 911.

Next 6 hours

NWS hourly forecast

  1. Now48°Cloudy8%5 mph
  2. 2 AM48°Slight Chance Rain Showers15%5 mph
  3. 3 AM48°Mostly Cloudy8%5 mph
  4. 4 AM48°Cloudy11%5 mph
  5. 5 AM48°Slight Chance Rain Showers21%5 mph
  6. 6 AM48°Chance Rain Showers25%5 mph

Hourly details

Next 7 days: temperature chart, feels like, rain and snow amounts, sky cover, wind and gustsShow

Radar and satellite

National radar

NEXRAD (up to 24 hours) and GOES

Latest

Frequently asked questions

What is the weather in Sullivan, WI right now?
The latest observation from Waukesha County Airport was 52°F and cloudy, reported at 10/31/2026, 12:35 AM CDT.
What is the high temperature today in Sullivan, WI?
The National Weather Service forecast for saturday calls for a high near 59°F. Rain Showers Likely.
Will it rain in Sullivan, WI in the next 24 hours?
The hourly forecast shows a 54% chance of precipitation around 10/31/2026, 10:00 AM CDT.
What is the 10-day forecast for Sullivan, WI?
The first 7 days come from the National Weather Service forecast. Days 8 to 10 (Nov 7 to Nov 9) come from the NOAA National Blend of Models, with highs of 59°F to 61°F. Model guidance this far out often changes.
What time is sunrise and sunset in Sullivan, WI today?
Sunrise is about 7:28 AM CDT and sunset is about 5:47 PM CDT (calculated for the center of the area, within a few minutes).
What is the normal October weather in Sullivan, WI?
At Sullivan 3se, the 1991 to 2020 normal high in October is 60°F and the normal low is 40°F.

Rain and snow totals

Next 3 days, NWS forecast grid

Rain (liquid)
0.34 in
Snow
0.00 in
Ice
0.00 in

Nearby hazards

Wisconsin hazards

Severe storm and flash flood outlooks, expected rain, river flooding and wildfires near this area

  • Severe storm outlook today:No thunderstorm risk area over this locationOutlook map
  • Excessive rainfall outlook (flash flood risk):Could not check the Weather Prediction Center outlook right now.
  • River gauges within 40 miles at or above flood stage: None reported
  • Active wildfires within 50 miles: WIBU 2 Fire (0 acres), WIBU 1 Fire (0 acres)

UV and air quality forecast

EPA and AirNow

AQI forecast today (Kettle Moraine South)
ModeratePM2.5
AQI forecast tomorrow (Kettle Moraine South)
ModeratePM2.5

UV index guide · Air quality

Drought

By county

Jefferson County, week of 10/27/2026

No drought or abnormal dryness in this county.

Sun and moon

Local time, center of the area

Sunrise
7:28 AM
Sunset
5:47 PM
Daylight
10 hr 20 min
Moon
Waning Gibbous 73% lit
First light (civil dawn)
6:58 AM
Last light (civil dusk)
6:17 PM
Moonrise
10:41 PM
Moonset
1:36 PM

Normal October weather

Climate

Normal October high 60°, low 40°, precipitation 2.95 in for the month. 1991 to 2020 normals at Sullivan 3se, 3 mi away.

Other places nearby

Data sources

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About this data

Weather and emergencies: Weather, air quality and hazard information on this page is delayed and may be incomplete. It is not a substitute for official warnings. Always follow the National Weather Service, local emergency management and public safety officials. In an emergency, call 911. For evacuation orders, use your local official alert system.

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