National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Black River Falls Area Airport (KBCK)

Lat: 44.25°NLon: 90.85°WElev: 830ft.

69°F

21°C

Humidity 96%
Wind Speed Calm
Barometer 30.13 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 11 Jul 9:35 pm CDT
Extended Forecast for

Merrillan WI

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, clear, with a low around 63. Calm wind.

    Low: 63 °F

    Clear then
    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 9am. Otherwise, sunny, with a high near 90. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 90 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 66. Light southwest wind.

    Low: 66 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 94. Heat index values as high as 99. Calm wind becoming west around 6 mph in the afternoon.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 66. Light southwest wind.

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 95. Calm wind becoming west around 6 mph in the afternoon.

    High: 95 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67. Light west wind.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 92. Light west wind.

    High: 92 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, clear, with a low around 63. Calm wind.
Sunday
Patchy fog before 9am. Otherwise, sunny, with a high near 90. Calm wind becoming southwest around 6 mph in the afternoon.
Sunday Night
Clear, with a low around 66. Light southwest wind.
Monday
Sunny, with a high near 94. Heat index values as high as 99. Calm wind becoming west around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 66. Light southwest wind.
Tuesday
Sunny and hot, with a high near 95. Calm wind becoming west around 6 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 67. Light west wind.
Wednesday
Sunny, with a high near 92. Light west wind.
Wednesday Night
Mostly clear, with a low around 65. Calm wind.
Thursday
Mostly sunny, with a high near 90. Calm wind becoming southwest around 5 mph in the afternoon.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66. Light south wind.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89. South wind 3 to 7 mph.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65. South wind 3 to 6 mph.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. Southeast wind 5 to 8 mph becoming west in the afternoon. Winds could gust as high as 18 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Merrillan WI
 44.45°N 90.85°W
Last Update:
9:21 pm CDT Jul 11, 2026
Forecast Valid:
9pm CDT Jul 11, 2026-6pm CDT Jul 18, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation