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 >
| NWS Forecast for: Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake (LMZ878) Issued by: National Weather Service Grand Rapids, MI Last Update: 313 AM CDT Sun Sep 20 2026 |  |
Today: Northeast winds 15 to 25 kt increasing to 30 kt. Patchy fog. Scattered showers and slight chance of thunderstorms this morning, then scattered showers this afternoon. Waves 4 to 7 ft occasionally to 9 ft building to 10 to 14 ft occasionally to 18 ft. Tonight: Northeast winds to 30 kt becoming east. Waves 10 to 14 ft occasionally to 18 ft subsiding to 7 to 10 ft occasionally to 13 ft. Monday: East winds to 30 kt becoming northeast. Waves 8 to 11 ft occasionally to 14 ft subsiding to 7 to 10 ft occasionally to 13 ft. Monday Night: Northeast winds to 30 kt. Waves 6 to 9 ft occasionally to 12 ft. Tuesday: Northeast winds to 30 kt. Waves 6 to 9 ft occasionally to 12 ft. Tuesday Night: Northeast winds to 30 kt diminishing to 15 to 25 kt. Waves 5 to 8 ft occasionally to 10 ft. Wednesday: Northeast winds 15 to 25 kt. Waves 5 to 8 ft occasionally to 10 ft. Thursday: East winds 10 to 20 kt becoming northeast 10 to 15 kt. Waves 3 to 5 ft. | |
| Zone Forecast: Lake Michigan from St Joseph to South Haven MI 5NM offshore to Mid Lake (LMZ878) | |
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