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: 743 PM EDT Fri Sep 18 2026

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Grand Rapids, MI Local Forecast Office

12NM SSW Pentwater MI

Marine Zone Forecast

Through Early Evening

Northeast winds 10 to 15 knots. Cloudy. Waves 1 foot or less.

Tonight

Northeast winds 10 to 20 knots veering east 15 to 25 knots after midnight. Rain showers likely in the evening, then rain showers and a slight chance of thunderstorms after midnight. Waves 1 to 2 feet.

Saturday

East winds 15 to 25 knots. Rain showers and a slight chance of thunderstorms. Waves 2 to 4 feet.

Saturday Night

East winds 10 to 20 knots backing northeast after midnight. Rain showers likely and a slight chance of thunderstorms. Waves 1 to 2 feet.

Sunday

Northeast winds 15 to 25 knots. Partly sunny with a slight chance of rain showers. Waves 2 to 4 feet building to 3 to 5 feet early in the afternoon.

Sunday Night

Northeast winds 15 to 25 knots. Mostly cloudy. Waves 3 to 5 feet subsiding to 1 to 3 feet after midnight.

Monday

Northeast winds 15 to 20 knots. Mostly cloudy. Waves 1 to 3 feet.

Tuesday

Northeast winds 15 to 20 knots. Partly sunny. Waves 1 to 2 feet.