Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Last Update: 703 AM EDT Sat Sep 19 2026

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Grand Rapids, MI Local Forecast Office

10NM SW South Haven MI

Marine Zone Forecast

Today
Southeast winds 10 to 20 knots. Rain showers and a chance of thunderstorms. Patchy fog. Waves around 1 foot.
Tonight
Southeast winds 5 to 15 knots backing east after midnight. Rain showers and a chance of thunderstorms. Patchy fog. Waves 1 foot or less.
Sunday
Northeast winds 10 to 20 knots. Mostly cloudy with a chance of rain showers and a slight chance of thunderstorms. Waves 2 to 4 feet.
Sunday Night
Northeast winds 15 to 25 knots. Partly cloudy. Waves 2 to 4 feet.
Monday
Northeast winds 15 to 25 knots. Mostly cloudy with a slight chance of rain showers. Waves 2 to 4 feet.
Tuesday
Northeast winds 15 to 25 knots. Partly sunny. Waves 2 to 4 feet.
Wednesday
Northeast winds 15 to 20 knots. Partly sunny. Waves 1 to 3 feet.



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703 AM EDT Sat Sep 19 2026
 
 

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