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Surf Forecasts:

Grand Marias surfForecast / Lake Superior / USA

information circle12 Day Weather and Surf, issued 1 pm Saturday 30 Aug 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
15.8° 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 Wednesday (Sep 03) at 5AM. The primary swell is predicted to be 1.0m and 5s period. 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 1.6m 6s and forecast to arrive on Wednesday (Sep 03) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Friday (Sep 05) at 11AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Wed 3rd Sep)3.5ft (1.0m) 5s
Best Surf 5AM (Wed 3rd Sep)3.5ft (1.0m) 5s
Most Powerful 2PM (Wed 3rd Sep)5ft (1.6m) 6s

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 Mostly dry. Warm (max 24°C on Mon afternoon, min 15°C on Sat night). Wind will be generally light.

Days 3-6 Weather Summary Heavy rain (total 23mm), heaviest during Wed afternoon. Warm (max 22°C on Tue afternoon, min 8°C on Thu night). Winds increasing (calm on Tue afternoon, strong winds from the NW by Wed afternoon).

Sat
30
Sunday
31
Monday
01
Tuesday
02
Wednesday
03
Thursday
04
Friday
05
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
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 (?)—
0.2
WNW
———
0.2
S
—
0.3
S
0.4
SSW
0.4
SSW
0.8
WSW
1.6
NNW
1.6
N
1.3
N
1.1
NNW
1.1
NW
1
WNW
0.9
W
———
Period(s) (?)-5---3-34346666565---
Wave
Graph
(?)Metric surfscale
Energy (?)020000000001992011088067580000
Wind
(km/h)
5
N
10
SSW
10
SSW
10
E
15
S
10
SSW
5
ESE
15
S
15
SW
5
NW
15
SSW
25
W
40
NW
25
NW
20
W
30
W
40
WSW
30
SW
35
WNW
35
W
35
WNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
glassoffoffcrossoffoffcross-
off		offcross-
off		glasscross-
off		crosscross-
on		cross-
on		crosscross-
off		cross-
off		cross-
off		cross-
on		crosscross-
on
High Tide
/ height (m)
n/a
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n/a
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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
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Sat
30
Sunday
31
Monday
01
Tuesday
02
Wednesday
03
Thursday
04
Friday
05
Sunrise--7:01--7:03--7:03--7:05--7:07--7:07--7:09
Sunset8:28--8:25--8:23--8:22--8:20--8:17--8:15--
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
rain showers
light rain
mod rain
cloud
light rain
light rain
light rain
part cloud
cloud
light rain
light rain
Rain (mm)
----------219-344--53
Temp. °C18172022202124212022191711999910131312
Feels °C (?)161519221919221919221916315423564
  • 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

Eyeball surf reportRecent Eyeball Surf Reports for Lake Superior

  1. weather stationWind Update Continuing clean conditions at Grand Marias (calm at BUOY-GRMM4 11 km from Grand Marias). not gfswave

    1 hour 33 minutes ago Grand Marias
Expand
<
>
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1 h 33 min ago

4 km/h
WNW
Clean
Please reload the page to see if there are any updates.

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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