National Weather Service Forecast for: Oshkosh WI
Issued by: National Weather Service Green Bay, WI
Updated: 10:51 pm CDT Jun 29, 2026
 
Tonight

Tonight: Partly cloudy, with a low around 74. South wind around 11 mph, with gusts as high as 21 mph.
Partly Cloudy

Tuesday

Tuesday: A 10 percent chance of showers before 7am.  Mostly sunny and hot, with a high near 91. Heat index values as high as 100. Southwest wind 11 to 15 mph, with gusts as high as 26 mph.
Slight Chance
Showers then
Sunny
Tuesday
Night
Tuesday Night: A 40 percent chance of showers and thunderstorms, mainly between 1am and 5am.  Partly cloudy, with a low around 74. Southwest wind 9 to 14 mph, with gusts as high as 23 mph.
Chance
T-storms then
Chance
Showers
Wednesday

Wednesday: A 40 percent chance of showers and thunderstorms, mainly after 1pm.  Mostly sunny, with a high near 87. Heat index values as high as 91. South southwest wind 8 to 14 mph, with gusts as high as 24 mph.
Chance
Showers

Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am.  Partly cloudy, with a low around 73. South southwest wind 11 to 14 mph, with gusts as high as 24 mph.  Chance of precipitation is 60%.
Chance
T-storms then
Showers
Likely
Thursday

Thursday: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm.  Mostly sunny, with a high near 86. Chance of precipitation is 60%.
Slight Chance
T-storms then
Showers
Likely
Thursday
Night
Thursday Night: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
Showers
Likely

Friday

Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm.  Mostly sunny, with a high near 82. Chance of precipitation is 60%.
Chance
T-storms then
Showers
Likely
Friday
Night
Friday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 68. Chance of precipitation is 60%.
Showers
Likely

Lo 74 °F Hi 91 °F Lo 74 °F Hi 87 °F Lo 73 °F Hi 86 °F Lo 70 °F Hi 82 °F Lo 68 °F

Hazardous Weather Outlook
Extreme Heat Warning
 

Tonight
 
Partly cloudy, with a low around 74. South wind around 11 mph, with gusts as high as 21 mph.
Tuesday
 
A 10 percent chance of showers before 7am. Mostly sunny and hot, with a high near 91. Heat index values as high as 100. Southwest wind 11 to 15 mph, with gusts as high as 26 mph.
Tuesday Night
 
A 40 percent chance of showers and thunderstorms, mainly between 1am and 5am. Partly cloudy, with a low around 74. Southwest wind 9 to 14 mph, with gusts as high as 23 mph.
Wednesday
 
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 87. Heat index values as high as 91. South southwest wind 8 to 14 mph, with gusts as high as 24 mph.
Wednesday Night
 
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 73. South southwest wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Thursday
 
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 86. Chance of precipitation is 60%.
Thursday Night
 
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
Friday
 
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 82. Chance of precipitation is 60%.
Friday Night
 
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Chance of precipitation is 60%.
Independence Day
 
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 82. Chance of precipitation is 50%.
Saturday Night
 
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Sunday
 
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 79.
Sunday Night
 
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Monday
 
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 78.

 

Forecast from NOAA-NWS for Oshkosh WI.