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Surf Forecasts

Grand Marias surfForecast / Lake Superior / USA

information circle12 Day Weather and Surf, issued 7 am Wednesday 12 Mar 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
0.1° C
 (Which is 2.0°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 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Mar 17) at 8AM. The primary swell is predicted to be 2.1m and 8s period with a secondary swell of 0.1m and 8s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Grand Marias in the next 12 days are 3.5m 9s and forecast to arrive on Sunday (Mar 16) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 7s period and expected on Saturday (Mar 15) at 8AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Mon 17th Mar)7ft (2.1m) 8s
Best Surf 8AM (Mon 17th Mar)7ft (2.1m) 8s
Most Powerful 5PM (Sun 16th Mar)11ft (3.5m) 9s

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 
Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
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 (?)
0.1
W
0.8
S
0.7
S
0.5
SW
0.3
SSW
0.9
SE
1.3
SE
1.4
SE
0.1
NE
0.2
ENE
0.2
ENE
1.5
S
3
WNW
3.5
NW
3
NW
1.8
WNW
0.8
WNW
1.5
SW
——————————————————
Period(s) (?)454434566766898766------------------
Wave
Graph
(?)Metric surfscale
Energy (?)000000002540113420651225337470000000000000000000
Wind
(km/h)
20
SSE
15
S
15
SSW
5
WSW
0
NE
15
SE
20
SSE
25
SSE
25
SE
25
SE
35
S
20
S
35
WNW
40
WNW
35
WNW
30
S
25
SSW
15
WNW
20
NW
20
NW
20
NNW
30
NNW
30
NW
30
NW
30
NW
25
NW
5
SE
20
ESE
20
ESE
15
E
10
SSW
10
SSE
25
S
30
SSE
45
SSE
40
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffoffcross-
off		glasscross-
off		cross-
off		cross-
off		cross-
off		cross-
off		offoffcross-
on		crosscrossoffoffcrosscross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		glasscross-
off		cross-
off		crosscross-
off		cross-
off		offcross-
off		cross-
off		off
High Tide
/ height (m)
n/a
n/a
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Low Tide
/ height (m)
n/a
n/a
n/a
n/a
n/a
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Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Sunrise8:03--8:00--8:00--7:58--7:56--7:54--7:52--7:50--7:48--7:46--7:43--7:41--
Sunset-7:45--7:45--7:47--7:49--7:50--7:52--7:52--7:54--7:55--7:57--7:59--8:00-
cloudcloudpart cloudpart cloudpart cloudpart cloudpart cloudcloudpart cloudlight rainlight rainpart cloudlight snowlight snowpart cloudcloudcloudpart cloudcloudlight snowlight snowcloudcloudcloudcloudcloudpart cloudcloudpart cloudpart cloudclearpart cloudclearpart cloudlight rainlight rain
Rain (mm)
---------33-1---------------------42
Temp. °C-23125259109108200163100-2-3-3-4-3-3-32-10425712
Feels °C (?)-9-2-4-23-2-14443-1-6-10-11-8-1-2-6-6-6-11-13-12-12-12-10-10-5-7-40-5-3-34

Short Range Forecast: Mostly dry. Icy conditions (max 10°C on Fri night, min -4°C on Wed morning). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 7mm) at first, then becoming colder with a dusting of snow on Sun morning. Icy conditions (max 10°C on Sat afternoon, min -2°C on Mon morning). Mainly strong winds.

Days 6-9 Weather Summary A dusting of new snow. Icy conditions (max 1°C on Tue morning, min -4°C on Wed night). Winds decreasing (fresh winds from the N on Tue night, calm by Thu night).

Long Range Forecast: Moderate rain (total 10mm), heaviest on Mon morning. Icy conditions (max 12°C on Sun night, min -5°C on Fri morning). Winds increasing (calm on Fri night, strong winds from the SSE by Sun afternoon).

  • 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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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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