Marathon County, WI Weather Forecast
County weather hub
Mostly Clear
Compare major city weather across Marathon County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly clear, with a low around 70. Heat index values as high as 77. West northwest wind around 7 mph.
County Weather Overview
This county weather page brings together forecast coverage for Marathon County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 7 of 7 mapped cities in Marathon County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Jul 14 to Jul 21, 2026
- Latest sync
- Jul 15, 2026 12:15 AM CDT
- Forecast office
- GRB
- Source
- NOAA / NWS
Daily Outlook
This Week in Marathon County
Wednesday looks like the warmest upcoming period in Marathon County at 92 degrees F.
Monday Night is the coolest period ahead with temperatures near 60 degrees F.
The strongest winds are forecast for Monday at about 6 to 13 mph W.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 15, 2026 12:15 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- GRB
- Radar station
- KGRB
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Areas of smoke after 10am. Mostly sunny, with a high near 92. Heat index values as high as 93. North northwest wind around 6 mph.
Smoke. Mostly cloudy, with a low around 65. Northeast wind 3 to 7 mph.
Smoke before 2pm. Mostly sunny, with a high near 89. Heat index values as high as 90. East southeast wind around 3 mph.
A chance of showers and thunderstorms between 7pm and 10pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 65. East southeast wind around 6 mph. Chance of precipitation is 40%.
A slight chance of rain showers before 7am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 88. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 67. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 40%.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 62. Chance of precipitation is 20%.
Mostly sunny, with a high near 85.
A chance of rain showers after 7pm. Partly cloudy, with a low around 64. Chance of precipitation is 30%.
A chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 60. Chance of precipitation is 20%.
A slight chance of rain showers between 7am and 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 79. Chance of precipitation is 20%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tonight
Jul 14
|
Mostly Clear
|
70°F |
7 mph
WNW
|
|
Wednesday
Jul 15
|
Areas Of Smoke
|
92°F |
6 mph
NNW
|
|
Wednesday Night
Jul 15
|
Smoke
|
65°F |
3 to 7 mph
NE
|
|
Thursday
Jul 16
|
Smoke
|
89°F |
3 mph
ESE
|
|
Thursday Night
Jul 16
|
Chance Showers And Thunderstorms
|
65°F |
6 mph
ESE
|
|
Friday
Jul 17
|
Chance Showers And Thunderstorms
|
88°F |
7 mph
SSE
|
|
Friday Night
Jul 17
|
Chance Showers And Thunderstorms
|
67°F |
6 mph
SSW
|
|
Saturday
Jul 18
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
86°F |
9 mph
NW
|
|
Saturday Night
Jul 18
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
62°F |
3 to 8 mph
NNE
|
|
Sunday
Jul 19
|
Mostly Sunny
|
85°F |
3 to 7 mph
SSE
|
|
Sunday Night
Jul 19
|
Chance Rain Showers
|
64°F |
6 mph
SW
|
|
Monday
Jul 20
|
Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
84°F |
6 to 13 mph
W
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms
|
60°F |
7 to 12 mph
NW
|
|
Tuesday
Jul 21
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
79°F |
12 mph
NNW
|
Major City Forecasts
Live forecast snapshots for major cities across Marathon County.
Coverage
Forecast coverage currently spans 7 of 7 mapped cities in Marathon County.
Largest mapped city population in this region: 8,143.
