Marathon, WI Weather Forecast
Local 7-day forecast
Patchy Fog then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Marathon, WI in one place.
Patchy fog before 8am. Mostly sunny, with a high near 89. Heat index values as high as 96. South southwest wind 3 to 10 mph.
Local Weather Overview
This forecast page for Marathon, WI is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jul 25, 2026 4:14 PM CDT.
The active forecast window currently covers Jul 26 to Jul 31, 2026 for Marathon, WI.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 26 to Jul 31, 2026
- Latest sync
- Jul 25, 2026 4:14 PM CDT
- Forecast office
- GRB
- Source
- NOAA / NWS
Daily Outlook
This Week in Marathon
Sunday looks like the warmest upcoming period in Marathon at 89 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 59 degrees F.
The strongest winds are forecast for Sunday at about 3 to 10 mph SSW.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 25, 2026 4:14 PM CDT
- Coverage
- 6 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
A chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 69. Heat index values as high as 96. Southwest wind 3 to 8 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 7am, then showers and thunderstorms likely between 7am and 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 85. Southwest wind 3 to 9 mph. Chance of precipitation is 60%.
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 62. Chance of precipitation is 40%.
Sunny, with a high near 83.
Mostly clear, with a low around 59.
Sunny, with a high near 83.
Mostly clear, with a low around 61.
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Partly cloudy, with a low around 63. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 83. 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 62. Chance of precipitation is 30%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Jul 26
|
Patchy Fog then Mostly Sunny
|
89°F |
3 to 10 mph
SSW
|
|
Sunday Night
Jul 26
|
Mostly Cloudy then Chance Showers And Thunderstorms
|
69°F |
3 to 8 mph
SW
|
|
Monday
Jul 27
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
85°F |
3 to 9 mph
SW
|
|
Monday Night
Jul 27
|
Chance Showers And Thunderstorms then Partly Cloudy
|
62°F |
9 mph
NNW
|
|
Tuesday
Jul 28
|
Sunny
|
83°F |
7 mph
N
|
|
Tuesday Night
Jul 28
|
Mostly Clear
|
59°F |
5 mph
NE
|
|
Wednesday
Jul 29
|
Sunny
|
83°F |
5 mph
ENE
|
|
Wednesday Night
Jul 29
|
Mostly Clear
|
61°F |
5 mph
ESE
|
|
Thursday
Jul 30
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
83°F |
6 mph
S
|
|
Thursday Night
Jul 30
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
63°F |
5 mph
SSW
|
|
Friday
Jul 31
|
Chance Showers And Thunderstorms
|
83°F |
3 to 7 mph
W
|
|
Friday Night
Jul 31
|
Chance Showers And Thunderstorms
|
62°F |
6 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Marathon.
