Marine Weather and Tide Forecast for Grand Haven, MI

DISCUSSION
Issued at 256 PM EDT Mon Oct 12 2026

- Three Chances for Rain This Week, then Cooler

An area of warm advection/isentropic ascent could bring a few showers and a low chance of thunder tonight, but moisture is limited and most places will remain dry. More rain is possible on Tuesday night into Wednesday as moisture pools along a stationary front draped across the southern forecast area, but most of the precip should remain to the south.

Widespread rain arrives on Thursday as a shortwave trough digs across the region with a vigorous surface low tracking through the Great Lakes. This is followed by sharply cooler temperatures for the weekend with a widespread freeze expected for Saturday and Sunday.

AVIATION /18Z TAFS THROUGH 18Z TUESDAY/
Issued at 129 PM EDT Mon Oct 12 2026

Skies are mostly clear across the region. Low pressure will move east from Wisconsin tonight and push a weak front across the terminals. We included a 30 percent chance of thunderstorms during the late evening and early overnight period. After the precipitation moves through, we'll return to VFR conditions.

MARINE
Issued at 256 PM EDT Mon Oct 12 2026

Based on the updated forecast of winds and waves, the Small Craft Advisory is extended into Tuesday afternoon and expanded south to South Haven.

GRR WATCHES/WARNINGS/ADVISORIES
MI...None.
MARINE...Small Craft Advisory until 2 PM EDT Tuesday for LMZ845>849.