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Areas of Excessive Rainfall and Extreme Heat; Monitoring Tropical Storm Erin

Heavy to excessive rainfall over the southern Appalachians may bring areas of flooding Tuesday. Hot to extremely hot temperatures are in place through Tuesday across much of the western U.S. and northern New England. Tropical Storm Erin is forecast to become a Major Hurricane by this weekend as it moves across the central Atlantic Ocean. Monitor future forecasts for any East Coast impacts. Read More >

Hazardous Weather Conditions

Current conditions at

Grand Marais/Cook County Airport (KCKC)

Lat: 47.84°NLon: 90.39°WElev: 1784ft.

Fair

63°F

17°C

Humidity 100%
Wind Speed SW 6 mph
Barometer 29.88 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 11 Aug 11:15 pm CDT
Extended Forecast for

Grand Portage MN

  • Tonight

    Tonight: A slight chance of showers between 3am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 63. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 63 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms before noon, then a chance of showers between noon and 1pm, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 75. West wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 75 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58. West wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 58 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 71. Northwest wind around 5 mph becoming southwest in the afternoon. Winds could gust as high as 15 mph.

    High: 71 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 56. South wind around 5 mph becoming east after midnight.

    Low: 56 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 68. Southeast wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 68 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. East wind around 5 mph becoming south after midnight. Winds could gust as high as 20 mph.

    Low: 61 °F

    Chance
    Showers

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. Southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 79 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 61. Southwest wind around 5 mph becoming northwest after midnight.

    Low: 61 °F

    Slight Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
A slight chance of showers between 3am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 63. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Tuesday
A slight chance of showers and thunderstorms before noon, then a chance of showers between noon and 1pm, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 75. West wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 58. West wind 5 to 10 mph, with gusts as high as 15 mph.
Wednesday
Mostly sunny, with a high near 71. Northwest wind around 5 mph becoming southwest in the afternoon. Winds could gust as high as 15 mph.
Wednesday Night
Partly cloudy, with a low around 56. South wind around 5 mph becoming east after midnight.
Thursday
Mostly sunny, with a high near 68. Southeast wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. East wind around 5 mph becoming south after midnight. Winds could gust as high as 20 mph.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. Southwest wind around 10 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 61. Southwest wind around 5 mph becoming northwest after midnight.
Saturday
A chance of showers, mainly before 1pm. Mostly sunny, with a high near 75. North wind around 5 mph becoming southwest in the afternoon.
Saturday Night
A slight chance of showers. Partly cloudy, with a low around 57. North wind around 5 mph, with gusts as high as 15 mph.
Sunday
Mostly sunny, with a high near 70. East wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 56. Northeast wind around 5 mph.
Monday
Mostly sunny, with a high near 70. East wind 5 to 10 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grand Portage MN
 47.96°N 89.69°W
Last Update:
9:26 pm CDT Aug 11, 2025
Forecast Valid:
11pm CDT Aug 11, 2025-6pm CDT Aug 18, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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