Snow-ForecastSnow-ForecastMountain-ForecastMountain-ForecastTide-ForecastTide-ForecastWeather-ForecastWeather-Forecast
Search by country, region, or break
Search by country, region, or break

Quick Links

Surf Forecasts

Ontonagon surfForecast / Lake Superior / USA

information circle12 Day Weather and Surf, issued 1 pm Sunday 17 Aug 2025 EDT
Forecast update in hr  min  s Forecast update imminent
Ontonagon surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Ontonagon sea temperature is
21.0° C
 (Which is 4.8°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Ontonagon this week:

The surf forecast for Ontonagon over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 18) at 11PM. The primary swell is predicted to be 1.1m and 6s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Ontonagon in the next 12 days are 1.1m 6s and forecast to arrive on Tuesday (Aug 19) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Monday (Aug 18) at 2AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)11PM (Mon 18th Aug)3.5ft (1.1m) 6s
Best Surf11PM (Mon 18th Aug)3.5ft (1.1m) 6s
Most Powerful 5AM (Tue 19th Aug)3.5ft (1.1m) 6s

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

Hourly12 Days
Lake Superior Surf
Print Surf Table
Updates in  hr  min  s Forecast update imminent 

Short Range Forecast Some drizzle, heaviest during Mon night. Warm (max 23°C on Mon afternoon, min 14°C on Sun night). Wind will be generally light.

Days 3-6 Weather Summary Moderate rain (total 13mm), heaviest on Thu night. Warm (max 23°C on Thu afternoon, min 15°C on Sat morning). Winds increasing (calm on Thu afternoon, fresh winds from the W by Fri morning).

Sun
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
0
0
0
1
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 (?)
1.3
ENE
0.1
NE
1.1
SE
1.2
ESE
1.1
E
1.1
ENE
0.5
E
0.4
ENE
0.2
E
——
0.2
SSW
0.4
SW
0.5
SW
0.8
SW
0.9
WSW
0.7
W
0.7
W
———
Period(s) (?)655566654--2334544---
Wave
Graph
(?)Metric surfscale
Energy (?)12610091121389200000001717000
Wind
(km/h)
25
ENE
20
SE
25
SE
15
S
5
S
15
NNW
10
N
5
NE
10
NNE
10
N
10
S
10
WSW
10
ENE
20
WSW
35
W
30
W
15
WSW
30
NNE
30
N
25
N
20
NNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
off		cross-
off		offglassononcross-
on		ononoffcross-
off		cross-
on		cross-
off		crosscrosscross-
off		onononon
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
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
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
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
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
n/a
n/a
Sun
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
Sunrise--6:58--6:58--7:00--7:01--7:03--7:03--7:05
Sunset9:05--9:02--9:00--8:59--8:58--8:55--8:53--
clearpart cloudcloudcloudlight raincloudpart cloudpart cloudpart cloudclearclearpart cloudclearrain showersrain showerspart cloudpart cloudlight rainlight rainlight rainlight rain
Rain (mm)
----1--------62--5121
Temp. °C201719232219191819201920232321222216141414
Feels °C (?)1612162324201918191920202525191819129910
  • 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 The wind is still cross-on at Ontonagon (light winds from the ENE at BUOY-OTNM4 3 km from Ontonagon). not gfswave

    50 minutes ago Ontonagon
Expand
<
>
View all

Actual: 50 min ago

18 km/h
ENE
Cross-On
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 Ontonagon 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 Ontonagon at:
surf-forecast.com

Information about the Ontonagon Surf forecast

The above surf forecast table for Ontonagon provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Ontonagon can be found by selecting the local surf guide option on the grey menu. Our Ontonagon 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 (Ontonagon) 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 Ontonagon 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.

Ontonagon is 151 km (94 miles) from the city of 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.

Nearest
Nearest
Nearest