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Surf Forecasts:

Grand Marias surfForecast / Lake Superior / USA

information circle12 Day Weather and Surf, issued 6 pm Thursday 15 Jan 2026 EST
Forecast update in hr  min  s Forecast update imminent
Grand Marias surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Grand Marias sea temperature is
1.9° C
 (Which is slightly cooler than normal)

Best Forecast Surf Conditions for Grand Marias this week:

The surf forecast for Grand Marias over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Jan 17) at 10AM. The primary swell is predicted to be 1.1m and 5s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Grand Marias in the next 12 days are 3.0m 8s and forecast to arrive on Monday (Jan 19) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Friday (Jan 16) at 1AM.

Wave TypeTime (EST) & Date Wave Height & Period
Next good surf (1 star+)10AM (Sat 17th Jan)3.5ft (1.1m) 5s
Best Surf10AM (Sat 17th Jan)3.5ft (1.1m) 5s
Most Powerful10AM (Mon 19th Jan)10ft (3.0m) 8s

Table - best surf conditions forecast for Grand Marias over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast A light covering of new snow mostly falling on Fri morning. Temperatures will be below freezing (max -1°C on Sat morning, min -7°C on Thu afternoon). Winds increasing (calm on Fri night, fresh winds from the NNW by Sat afternoon).

Days 3-6 Weather Summary A heavy fall of snow, heaviest during Sun night. Temperatures will be well below freezing (max -7°C on Sun afternoon, min -13°C on Mon night). Winds increasing (light winds from the NNE on Sun afternoon, fresh winds from the WNW by Mon afternoon).

Thu
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.2
ENE
1.6
S
1.2
SSE
0.1
W
0.9
ESE
1.1
NE
1.1
NNE
0.9
N
0.8
WNW
1.4
SW
2.4
WNW
3
NNW
3
NNW
2.3
NW
2
WNW
2.2
W
2
W
1.7
WNW
1.5
NW
——
Period(s) (?)4655555546788877766--
Wave
Graph
(?)Metric surfscale
Energy kJ (?)10010515638190574141094562239448036623714800
Wind
(km/h)
10
S
25
S
15
SE
20
SE
10
W
5
NE
25
NNW
25
NNW
15
NNW
10
NNE
25
NNW
35
NW
35
WNW
30
WNW
30
NW
30
WNW
20
WNW
20
SW
10
SSW
10
WNW
25
NNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffcross-
off		cross-
off		cross-
off		glassoncross-
on		onononcross-
on		cross-
on		cross-
on		cross-
on		cross-
on		crosscross-
off		offcross-
on		on
High Tide
/ height (m)
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
Low Tide
/ height (m)
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
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n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
Thu
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Sunrise--8:23--8:22--8:22--8:22--8:21--8:19--8:18
Sunset5:22--5:23--5:24--5:27--5:28--5:29--5:30--
cloud
cloud
light snow
light snow
light snow
cloud
cloud
light snow
light snow
light snow
mod snow
light snow
light snow
mod snow
light snow
light snow
light snow
cloud
light snow
light snow
light snow
Rain (mm)
---------------------
Temp. °C-7-6-2-2-2-1-1-4-6-7-7-10-12-13-12-11-10-10-8-5-6
Feels °C (?)-12-14-9-8-5-7-8-12-12-12-13-20-22-23-22-21-19-16-13-12-14
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Latest Updates

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FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Grand Marias surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Grand Marias at:
surf-forecast.com

Information about the Grand Marias Surf forecast

The above surf forecast table for Grand Marias provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Grand Marias can be found by selecting the local surf guide option on the grey menu. Our Grand Marias surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Grand Marias) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Grand Marias may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Grand Marias is 100 km (62 miles) from Marquette. If you plan a vacation in Lake Superior, look for hotels and other accommodation in Marquette. Marquette has rooms for a wide range of budgets as well as car hire and transport links.

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