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Potosi, WI 53820 Weather
It is 43°F and partly cloudy in Potosi, WI 53820, observed at 7:35 AM CDT. Today: Mostly Cloudy then Slight Chance Rain Showers, high 56°F, low 49°F. Hourly and 10-day forecast from the National Weather Service. Times are local (CDT).
Potosi, WI 53820 current weather
43°F
Partly Cloudy
H 56° / L 49°Feels like 43°
No rain expected in the next 12 hours
Observed at Platteville Municipal Airport (13.5 mi away), 10/30/2026, 7:35 AM CDT
Hourly forecast
NWS, updated 10/30/2026, 4:31 AM PT
10-day forecast
Tap a day for details
Today10/3061% chance of precipitationLow 49°High 56°
Today: A slight chance of rain showers after 3pm. Mostly cloudy, with a high near 56. East wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Tonight: A slight chance of rain showers before 1am, then showers and thunderstorms likely. Cloudy. Low around 49, with temperatures rising to around 52 overnight. East wind 6 to 9 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Mostly Cloudy then Slight Chance Rain ShowersSat10/3178% chance of precipitationLow 50°High 61°
Saturday: Showers and thunderstorms before 5pm. Cloudy, with a high near 61. Southeast wind 5 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
Saturday Night: Mostly cloudy, with a low around 50. Southeast wind around 5 mph.
Showers And ThunderstormsSun11/117% chance of precipitationLow 53°High 65°
Sunday: A slight chance of rain showers after noon. Partly sunny, with a high near 65. Southeast wind around 6 mph. Chance of precipitation is 20%.
Sunday Night: Mostly cloudy, with a low around 53. Southeast wind 3 to 7 mph.
Partly Sunny then Slight Chance Rain ShowersMon11/284% chance of precipitationLow 57°High 67°
Monday: Rain showers likely. Mostly cloudy, with a high near 67. Southeast wind 7 to 17 mph. Chance of precipitation is 70%.
Monday Night: Rain showers. Mostly cloudy, with a low around 57. Southeast wind around 18 mph. Chance of precipitation is 80%.
Rain Showers LikelyTue11/384% chance of precipitationLow 52°High 68°
Tuesday: Rain showers. Mostly cloudy, with a high near 68. South wind 10 to 17 mph. Chance of precipitation is 80%.
Tuesday Night: A chance of rain showers. Mostly cloudy, with a low around 52. Southwest wind 7 to 10 mph. Chance of precipitation is 50%.
Rain ShowersWed11/462% chance of precipitationLow 47°High 64°
Wednesday: Rain showers likely. Mostly cloudy, with a high near 64. West wind around 9 mph. Chance of precipitation is 60%.
Wednesday Night: A chance of rain showers. Mostly cloudy, with a low around 47. Northwest wind around 7 mph. Chance of precipitation is 30%.
Rain Showers LikelyThu11/523% chance of precipitationLow 42°High 61°
Thursday: A slight chance of rain showers. Partly sunny, with a high near 61. Northwest wind around 8 mph. Chance of precipitation is 20%.
Thursday Night: Mostly cloudy, with a low around 42. North wind around 5 mph.
Slight Chance Rain ShowersFri11/6Model blend15% chance of precipitationLow 39°High 57°
Friday: Partly cloudy, slight chance of rain. High near 57°. 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.
Sat11/7Model blend11% chance of precipitationLow 40°High 57°
Saturday: Partly cloudy. High near 57°. 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.
Sun11/8Model blend14% chance of precipitationLow 41°High 59°
Sunday: Partly cloudy. High near 59°. Low that night near 41°. About 0.02 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.
Forecast for 42.677, -90.707 from the NWS ARX office, updated 10/30/2026, 4:31 AM PT · Official forecast on weather.gov
Days 8 to 10: NOAA National Blend of Models, station KDBQ (Dubuque Rgnl, 19 mi), model run 10/30/2026, 3:00 AM 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
- Now43°Mostly Cloudy3%5 mph
- 9 AM46°Mostly Cloudy5%5 mph
- 10 AM48°Mostly Cloudy5%6 mph
- 11 AM50°Cloudy4%6 mph
- 12 PM51°Cloudy4%6 mph
- 1 PM52°Cloudy9%6 mph
Hourly details
Next 7 days: temperature chart, feels like, rain and snow amounts, sky cover, wind and gustsShowHide
Radar and satellite
National radarNEXRAD (up to 24 hours) and GOES
Frequently asked questions
- What is the weather in Potosi, WI 53820 right now?
- The latest observation from Platteville Municipal Airport was 43°F and partly cloudy, reported at 10/30/2026, 7:35 AM CDT.
- What is the high temperature today in Potosi, WI 53820?
- The National Weather Service forecast for today calls for a high near 56°F. Mostly Cloudy then Slight Chance Rain Showers.
- Will it rain in Potosi, WI 53820 in the next 24 hours?
- The hourly forecast shows a 55% chance of precipitation around 10/31/2026, 4:00 AM CDT.
- What is the 10-day forecast for Potosi, WI 53820?
- The first 7 days come from the National Weather Service forecast. Days 8 to 10 (Nov 6 to Nov 8) come from the NOAA National Blend of Models, with highs of 57°F to 59°F. Model guidance this far out often changes.
- What time is sunrise and sunset in Potosi, WI 53820 today?
- Sunrise is about 7:34 AM CDT and sunset is about 5:58 PM CDT (calculated for the center of the area, within a few minutes).
- What is the normal October weather in Potosi, WI 53820?
- At Dubuque L&d 11, the 1991 to 2020 normal high in October is 61°F and the normal low is 42°F.
Nearby hazards
Wisconsin hazardsSevere storm and flash flood outlooks, expected rain, river flooding and wildfires near this area
- Severe storm outlook today:General thunderstormsOutlook 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: None reported
UV and air quality forecast
EPA and AirNow
- AQI forecast today (Driftless Area South)
- GoodOzone
- AQI forecast tomorrow (Driftless Area South)
- ModeratePM2.5
Drought
By countyGrant County, week of 10/27/2026
No drought or abnormal dryness in this county.
Sun and moon
Local time, center of the area
- Sunrise
- 7:34 AM
- Sunset
- 5:58 PM
- Daylight
- 10 hr 24 min
- Moon
- Waning Gibbous 80% lit
- First light (civil dawn)
- 7:05 AM
- Last light (civil dusk)
- 6:27 PM
- Moonrise
- 9:32 PM
- Moonset
- 12:56 PM
Normal October weather
ClimateNormal October high 61°, low 42°, precipitation 3.08 in for the month. 1991 to 2020 normals at Dubuque L&d 11, 10 mi away.
Other places nearby
Data sources
- National Weather Service APINOAA · Official site
- National Blend of Models (NBM) text guidanceNOAA National Weather Service · Official site
- Convective Outlooks and Storm ReportsNOAA Storm Prediction Center · Official site
- Excessive Rainfall Outlook and Quantitative Precipitation ForecastsNOAA Weather Prediction Center · Official site
- National Water Prediction ServiceNOAA National Weather Service · Official site
- WFIGS Current Wildland Fire IncidentsNational Interagency Fire Center · Official site
- UV Index Forecast (Envirofacts)U.S. Environmental Protection Agency and NOAA · Official site
- AirNowU.S. Environmental Protection Agency · Official site
- NWS HeatRisk (experimental)NOAA National Weather Service · Official site
- U.S. Drought MonitorNational Drought Mitigation Center, USDA and NOAA · Official site
- BEACON 2.0 Beach Advisory and Closing On-line NotificationU.S. Environmental Protection Agency · Official site
- U.S. Climate Normals 1991-2020NOAA National Centers for Environmental Information · Official site
- Tides & Currents (CO-OPS API)NOAA Center for Operational Oceanographic Products and Services · Official site
- NEXRAD radar tilesIowa Environmental Mesonet, Iowa State University · Official site
- GOES-East and GOES-West GeoColor imageryNOAA NESDIS Center for Satellite Applications and Research · Official site
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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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