Surf Forecasts:
Grand Marias surf forecast from 11 Sep 2026:
- Best quality surf: Tuesday 15 Sep, 11AM (local time) - 10ft (3.0m), 8s period, WSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 15 Sep, 11AM (local time) - 10ft (3.0m), 8s period, WSW swell with 1,114 kJ wave energy.
- Next surfable swell (1★+): Tuesday 15 Sep, 11AM (local time) - 10ft (3.0m), 8s period with WSW swell.
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 Tuesday (Sep 15) at 11AM. The primary swell is predicted to be 3.0m and 8s 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 3.0m 8s and forecast to arrive on Tuesday (Sep 15) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 7s period and expected on Tuesday (Sep 15) at 5AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Tue 15th Sep) | 10ft (3.0m) 8s |
| Best Surf | 11AM (Tue 15th Sep) | 10ft (3.0m) 8s |
| Most Powerful | 11AM (Tue 15th Sep) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Grand Marias over the next 16 days.
Short Range ForecastMostly dry. Warm (max 24°C on Fri afternoon, min 13°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Mon night. Warm (max 20°C on Tue afternoon, min 12°C on Wed night). Winds increasing (calm on Mon afternoon, strong winds from the SSW by Mon night). | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | SSW 5 | SSW 5 | SSW 6 | SSW 6 | W 6 | WNW 7 | NW 6 | NW 6 | NW 5 | NW 4 | NW 4 | ENE 8 | WSW 8 | W 8 | WNW 7 | NW 5 | NW 5 | W 4 | — | — | — |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 200 | 240 | 206 | 178 | 27 | 3 | 1 | 6 | 1114 | 1034 | 198 | 29 | 11 | 6 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | cross-off | cross-on | cross-on | cross-on | cross-on | cross-on | glassy | off | off | cross-off | cross-on | cross-off | on | on | on | cross-off | cross-off | cross |
High Tide | |||||||||||||||||||||
Low Tide | |||||||||||||||||||||
 | |  |  |  | | | |  | | |  |  | | | | |  | |  |  | |
 | 7:16 | — | — | 7:16 | — | — | 7:18 | — | — | 7:20 | — | — | 7:20 | — | — | 7:22 | — | — | 7:24 | — | — |
 | — | 8:04 | — | — | 8:01 | — | — | 8:00 | — | — | 7:58 | — | — | 7:55 | — | — | 7:53 | — | — | 7:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 10 | 3 | — | — | — | — | — | — | 1 | 14 |
Temp °C | 20 | 24 | 21 | 22 | 20 | 19 | 15 | 15 | 15 | 14 | 18 | 17 | 18 | 20 | 16 | 15 | 15 | 14 | 15 | 16 | 12 |
Feels °C | 16 | 21 | 18 | 19 | 17 | 14 | 9 | 8 | 8 | 12 | 15 | 12 | 14 | 15 | 11 | 13 | 13 | 10 | 10 | 12 | 8 |
Swell 1 Height (m) Direction Period (s) | — | — | SE 7 | E 7 | — | WSW 7 | — | — | NW 5 | NW 4 | NW 4 | ENE 8 | ESE 8 | SE 9 | W 6 | WNW 6 | W 5 | — | — | — | — |
| kJ | — | — | 2 | 1 | — | 37 | — | — | 27 | 3 | 1 | 6 | 7 | 3 | 30 | 13 | 2 | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | W 5 | W 5 | — | E 7 | ESE 7 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 5 | 2 | — | 1 | 4 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | SSW 5 | SSW 6 | SSW 6 | W 6 | WNW 7 | NW 6 | NW 6 | — | — | SE 4 | SSE 7 | WSW 8 | W 8 | WNW 7 | NW 5 | NW 5 | W 4 | — | — | — |
| kJ | 73 | 75 | 230 | 231 | 200 | 240 | 206 | 178 | — | — | 24 | 643 | 1114 | 1034 | 198 | 29 | 11 | 6 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1284 | 1687 | 1286 | 2409 | 2417 | 1275 | 1195 | 1195 | 1208 | 1231 | 1258 | 1276 | 1694 | 1594 | 0 | 2409 | 2409 | 1205 | 1201 | 1380 | 1205 |
Best forecast wave conditions in Lake Superior | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.
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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