National Weather Service

News Headlines

Review of August 18, 2026 line of severe thunderstorms

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Wittman Regional Airport (KOSH)

Lat: 43.97°NLon: 88.56°WElev: 801ft.

Fair

58°F

14°C

Humidity	93%
Wind Speed	S 7 mph
Barometer	30.07 in (1017.4 mb)
Dewpoint	56°F (13°C)
Visibility	10.00 mi
Last update	28 Aug 12:53 am CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Green Lake WI

Overnight
Low: 56 °F
Patchy Fog
Friday
High: 81 °F
Mostly Sunny
Friday Night
Low: 60 °F
Partly Cloudy
Saturday
High: 75 °F
Slight Chance
Showers then
Showers
Likely
Saturday Night
Low: 64 °F
Showers
Likely
Sunday
High: 83 °F
Chance
Showers
Sunday Night
Low: 68 °F
Chance
T-storms
Monday
High: 85 °F
Slight Chance
T-storms
Monday Night
Low: 67 °F
Chance
T-storms

Detailed Forecast

Overnight

Patchy fog after 4am. Otherwise, partly cloudy, with a low around 56. Calm wind.

Friday

Mostly sunny, with a high near 81. Calm wind becoming southwest around 5 mph in the afternoon.

Friday Night

Partly cloudy, with a low around 60. South wind around 5 mph.

Saturday

Showers likely, mainly after 2pm. Mostly cloudy, with a high near 75. South wind 5 to 10 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday Night

Showers likely and possibly a thunderstorm before 10pm, then showers likely between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64. South wind 10 to 15 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Sunday

A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. Southwest wind around 10 mph. Chance of precipitation is 30%.

Sunday Night

A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 68. South wind 5 to 10 mph.

Monday

A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 85. Southwest wind around 10 mph.

Monday Night

A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 67.

Tuesday

A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 85. Chance of precipitation is 20%.

Tuesday Night

A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.

Wednesday

Partly sunny, with a high near 84.