Marine Weather and Tide Forecast for Mount Pleasant, WI

SHORT TERM
Issued 100 AM CST CST Sun Nov 8 2026

Today and Tonight:

Low pressure tracks east across Ontario Canada today, dragging a cold front across WI. A southwest breeze continues predawn this morning ahead of the front, advecting some higher dewpoints into the region. The moist advection on these winds is no longer expected to produce fog or low stratus clouds, likely a combination of the high-altitude clouds and continued southwest breeze working to keep the boundary layer from saturating. Later this morning a cold front crosses the region, with 20-30 mph gusts and sunny skies through the afternoon.
Winds subside tonight as a weak surface ridge passes overhead.
Inland low temps in the low 30s, slightly warmer near Lake Michigan. Though the post cold front winds allow drier air to return and high-altitude clouds build back into the region tonight, the calm winds and gaps in the clouds could result in the formation of ground fog, particularly for inland areas. Far eastern WI will see slightly warmer low temps, as well as a land-breeze circulation (slight offshore winds), likely reducing fog potential.

Sheppard

LONG TERM
Issued 100 AM CST CST Sun Nov 8 2026

Monday through Saturday:

Another low pressure system tracking east into Ontario Canada on Monday will work with high pressure across the Lower Mississippi River Valley to drive breezy southwest winds on Monday, with highs in the mid to upper 50s. A weak cold front follows Monday night, with light northwest winds and slightly warmer (around 60) high temperatures for Tuesday.

Into Wednesday, high pressure slides southeast across Manitoba and a deepening trough in the jet dives from the Dakotas towards the Ohio River Valley. Low pressure develops near the southern tip of IL in response to the trough, with both features tracking east. QG ascent from the approaching trough coupled with some Lake Superior boundary layer moisture could result in some light rain Wednesday (15-30% chance). Highs in the low 50s.

As both pressure systems intensify and the low exits east, north winds become gusty across the lake Wednesday night into Thursday.
Lake effect showers will become possible across far eastern WI at times Wednesday night through Friday. High temperatures dive to the 40s, with lows in the upper 20s to 30s.

Sheppard

AVIATION
Issued 100 AM CST Sun Nov 8 2026

VFR conditions and dry weather expected through the TAF period, with a few periods of high-altitude clouds. Breezy southwest winds early this morning, some marginal LLWS but not high enough for inclusion in the TAFs. Winds veer west to northwest and become gusty behind a dry cold front late this morning, remaining gusty (20 to 30 kt gusts) until this evening. Light and variable winds expected overnight tonight, with some potential for patchy ground fog late tonight into early Monday morning. Much lower potential for fog in far eastern WI (near Lake MI) due to warmer temperatures and a light offshore breeze.

Sheppard

MARINE
Issued 100 AM CST Sun Nov 8 2026

Low pressure of 29.5 inches will move east across Ontario Canada today, bringing breezy southwesterly winds to Lake Michigan early this morning. Winds will veer west / northwest later this morning as a cold front passes, with breezy conditions (gusts to 30 kt) until late tonight. A shallow surface ridge yields some light and variable winds for a brief period Monday morning.

Winds become southwesterly again as an additional low pressure system moves through the Canadian Prairies on Monday, shifting to northwesterly Monday night as low pressure exits into Ontario and another cold front sweeps southeastward. Winds then shift westerly through Tuesday into Tuesday night before turning northerly as low pressure deepens into the Ohio River Valley Wednesday. Wednesday into Thursday, expect a strong north- south band of lake effect rain to develop; a few snowflakes could mix in at times if overnight/morning temperatures allow.
Northerly Gales are possible on Thursday.

Nearshore Zones: A Small Craft Advisory is in effect from 6 AM to 6 PM today due to gusty west to northwest winds (20-30 kt gusts). Waves generally remain 3 ft or less due to the offshore flow. Small Craft Advisory conditions return Wednesday night through Friday due to brisk northerly winds and high waves.

Sheppard

MKX WATCHES/WARNINGS/ADVISORIES
WI...None.
LM
Small Craft Advisory
LMZ643-LMZ644-LMZ645-LMZ646...6 AM Sunday to 6 PM Sunday.