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Surf Forecasts

Grand Marias surfForecast / Lake Superior / USA

information circle12 Day Weather and Surf, issued 7 am Friday 09 May 2025 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
3.3° C
 (Which is slightly warmer than usual)

Best Forecast Surf Conditions for Grand Marias this week:

The most powerful waves expected at Grand Marias in the next 12 days are 0.8m 5s and forecast to arrive on Saturday (May 10) at 11AM. Winds are predicted to be 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 Monday (May 12) at 2AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11AM (Sat 10th May)2.5ft (0.8m) 5s

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

Hourly12 Days
Lake Superior Surf
Print Surf Table
Updates in  hr  min  s Forecast update imminent 
Friday
09
Saturday
10
Sunday
11
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tuesday
20
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.3
SSW
0.3
S
0.2
NNE
0.8
N
0.7
NNW
0.4
NW
0.7
SSE
1
SSE
1.6
SSW
1.2
SSW
0.1
W
1.3
SSW
0.9
S
0.7
SSE
0.8
S
0.6
SSE
0.6
ESE
0.7
SE
——————————————————
Period(s) (?)332554456646544444------------------
Wave
Graph
(?)Metric surfscale
Energy (?)00028194000000000000000000000000000000
Wind
(km/h)
10
SW
5
SE
10
NNE
25
N
20
NW
0
NNW
15
S
25
SSW
25
SSW
20
SSW
25
S
20
S
15
S
20
S
15
S
10
S
10
E
10
S
15
E
10
ESE
20
SE
25
S
15
W
25
WSW
35
WNW
35
NW
15
NNW
5
NE
10
ENE
15
S
15
S
15
SSE
20
SE
25
ESE
20
SE
25
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
on		oncross-
on		glassoffoffoffoffoffoffoffoffoffoffcrossoffcrosscross-
off		cross-
off		offcrosscross-
off		crosscross-
on		oncross-
on		crossoffoffcross-
off		cross-
off		cross-
off		cross-
off		cross-
off
High Tide
/ height (m)
n/a
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Low Tide
/ height (m)
n/a
n/a
n/a
n/a
n/a
n/a
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Friday
09
Saturday
10
Sunday
11
Monday
12
Tuesday
13
Wednesday
14
Thursday
15
Friday
16
Saturday
17
Sunday
18
Monday
19
Tuesday
20
Sunrise6:18--6:16--6:15--6:13--6:13--6:11--6:09--6:09--6:07--6:07--6:05--6:03--
Sunset-9:04--9:05--9:06--9:07--9:08--9:09--9:10--9:12--9:14--9:15--9:15--9:16-
clearclearpart cloudclearclearpart cloudpart cloudpart cloudclearclearclearclearclearpart cloudpart cloudpart cloudpart cloudrain showerspart cloudpart cloudpart cloudmod rainrain showerslight rainlight raincloudclearclearpart cloudclearclearpart cloudpart cloudrain showersrain showersheavy rain
Rain (mm)
-----------------3---7211--------1213
Temp. °C914125551215131519171821191817161418221514954571011131716101716
Feels °C (?)5119-2-1089811151415191718171512172112115-3-4-14679131251516

Short Range Forecast: Mostly dry. Very mild (max 15°C on Sun afternoon, min 4°C on Fri morning). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 3mm), mostly falling on Wed night. Warm (max 21°C on Tue afternoon, min 9°C on Mon morning). Wind will be generally light.

Days 6-9 Weather Summary Moderate rain (total 11mm), heaviest on Fri morning. Warm (max 22°C on Thu night, min 4°C on Sat morning). Mainly fresh winds.

Long Range Forecast: Moderate rain (total 16mm), heaviest on Tue night. Very mild (max 17°C on Mon afternoon, min 5°C on Sun morning). Wind will be generally light.

  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
<span class="translation_missing" title="translation missing: en.leaflet.map_placeholder_alt">Map Placeholder Alt</span>
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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 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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