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Surf Forecasts:

Grand Marias surfForecast / Lake Superior / USA

information circle16 Day Weather and Surf, issued 1 pm Thursday 16 Apr 2026 EDT
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
1.0° C
 (Which is 1.0°C colder than average for this time of year)

Best Forecast Surf Conditions for Grand Marias this week:

The surf forecast for Grand Marias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Apr 20) at 8AM. The primary swell is predicted to be 1.3m and 6s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Grand Marias in the next 16 days are 4.0m 9s and forecast to arrive on Saturday (Apr 18) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.4m 7s period and expected on Saturday (Apr 18) at 2AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Mon 20th Apr)4.5ft (1.3m) 6s
Best Surf 8AM (Mon 20th Apr)4.5ft (1.3m) 6s
Most Powerful 8PM (Sat 18th Apr)13ft (4.0m) 9s

Table - best surf conditions forecast for Grand Marias over the next 16 days.

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

Short Range Forecast Moderate rain (total 15mm), heaviest on Fri night. Icy conditions (max 15°C on Fri afternoon, min 0°C on Sat night). Winds increasing (light winds from the ENE on Thu night, strong winds from the WNW by Sat morning).

Days 3-6 Weather Summary Mostly dry. Icy conditions (max 7°C on Mon afternoon, min 0°C on Sun afternoon). Winds decreasing (strong winds from the SSW on Mon night, calm by Tue night).

Thu
16
Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
1
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)——
1
SE
1.7
SSE
0.2
ENE
3
WNW
4
WNW
3.5
WNW
3
NW
2.5
NW
1.8
NNW
1
WNW
0.4
W
2
S
2.2
WSW
1.4
WSW
1.3
WNW
1.2
NNW
———
Period(s) (?)--4688998765567656---
Wave
Graph
(?)Metric surfscale
Energy kJ (?)0000614132252154694666227160705041608584000
Wind
(km/h)
10
NNE
10
ESE
25
SSE
30
SSE
20
SSW
40
WNW
40
WNW
30
NW
30
NW
30
NW
15
NW
10
SSW
30
S
45
SSW
25
NW
20
NW
5
NW
15
S
20
S
20
S
15
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
oncross-
off		offoffoffcrosscross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
off		offoffcross-
on		cross-
on		glassoffoffoffcross-
off
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
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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
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
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n/a
n/a
n/a
n/a
Thu
16
Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Sunrise--6:54--6:52--6:50--6:48--6:47--6:45--6:43
Sunset8:32--8:34--8:36--8:37--8:37--8:39--8:40--
part cloud
part cloud
part cloud
part cloud
heavy rain
rain showers
clear
part cloud
cloud
part cloud
clear
clear
cloud
cloud
part cloud
part cloud
clear
clear
part cloud
part cloud
rain showers
Rain (mm)
----141--------------1
Temp. °C76121515223001377654712108
Feels °C (?)427109-7-8-7-9-9-4-2-1-10-2-12645
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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 16 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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