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August 2026 Upper Mississippi River Valley Weather Summary

Hazardous Weather Conditions

Current conditions at

Boscobel, Boscobel Airport (KOVS)

Lat: 43.16°NLon: 90.68°WElev: 673ft.

Fair

80°F

27°C

Humidity	85%
Wind Speed	W 6 mph
Barometer	29.88 in (1011.3 mb)
Dewpoint	75°F (24°C)
Visibility	10.00 mi
Heat Index	85°F (29°C)
Last update	4 Sep 4:53 pm CDT

More Information:

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

Extended Forecast for

Fennimore WI

Heat Advisory until September 4, 07:00pm

Click here for hazard details and duration

Heat Advisory

Heat Advisory until September 4, 07:00pm
NOW until 7:00pm Fri
Heat Advisory
This Afternoon
High: 88 °F
Chance
T-storms
Tonight
Low: 68 °F
Showers
Likely then
Patchy Fog
Saturday
High: 85 °F
Areas Fog
then Mostly
Sunny
Saturday Night
Low: 63 °F
Partly Cloudy
Sunday
High: 81 °F
Partly Sunny
Sunday Night
Low: 61 °F
Partly Cloudy
Labor Day
High: 80 °F
Mostly Sunny
Monday Night
Low: 64 °F
Mostly Cloudy

Detailed Forecast

This Afternoon

A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. Southwest wind around 9 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight

Showers and thunderstorms likely, mainly before 10pm. Patchy fog before 4am, then patchy fog after 5am. Otherwise, partly cloudy, with a low around 68. West wind around 5 mph becoming light and variable. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday

Areas of fog before 9am. Otherwise, mostly sunny, with a high near 85. Northeast wind 6 to 8 mph.

Saturday Night

Partly cloudy, with a low around 63. East wind around 6 mph.

Sunday

Partly sunny, with a high near 81. Southeast wind 3 to 7 mph.

Sunday Night

Partly cloudy, with a low around 61. Southeast wind around 6 mph.

Labor Day

Mostly sunny, with a high near 80. South wind 6 to 10 mph.

Monday Night

Mostly cloudy, with a low around 64. Southeast wind 8 to 11 mph, with gusts as high as 21 mph.

Tuesday

A chance of showers and thunderstorms before 1pm, then a slight chance of showers. Partly sunny, with a high near 85. South wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

Tuesday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 68. South wind 9 to 14 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 60%.

Wednesday

Partly sunny, with a high near 85. West wind 7 to 13 mph, with gusts as high as 21 mph.

Wednesday Night

A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62. West wind 5 to 9 mph.

Thursday

Mostly sunny, with a high near 78. Northwest wind 5 to 9 mph.

Thursday Night

A 30 percent chance of showers. Partly cloudy, with a low around 58. Northwest wind around 5 mph becoming calm in the evening.

Friday

A 20 percent chance of showers. Partly sunny, with a high near 79. South wind 3 to 8 mph.