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Ontonagon surfForecast / Lake Superior / USA

information circle12 Day Weather and Surf, issued 7 am Thursday 03 Jul 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
12.7° C
 (Which is 5.7°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Ontonagon this week:

The most powerful waves expected at Ontonagon in the next 12 days are 0.6m 4s and forecast to arrive on Sunday (Jul 06) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Saturday (Jul 05) at 5AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Sun 6th Jul)2ft (0.6m) 4s

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 
Thursday
03
Friday
04
Saturday
05
Sunday
06
Monday
07
Tuesday
08
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
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 (?)——
0.4
SE
0.4
SSE
0.3
SSE
0.6
SSW
0.7
SW
0.6
WSW
0.6
NW
0.5
N
————
0.2
ESE
0.2
ESE
0.2
E
0.2
E
——————————————————
Period(s) (?)--34344443----2333------------------
Wave
Graph
(?)Metric surfscale
Energy (?)0000000010500000011000000000000000000
Wind
(km/h)
10
NE
15
NE
15
S
15
SSW
5
S
20
SSW
20
SW
20
WSW
10
W
5
N
10
N
5
S
5
NW
5
N
5
ENE
10
NW
5
N
5
E
5
N
10
NNE
10
SE
5
SSE
5
ENE
10
SE
15
SSE
15
ESE
15
ESE
15
E
20
NNE
15
W
15
WSW
20
WSW
10
SSW
10
WNW
10
N
15
NNE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		offoffoffoffcross-
off		cross-
off		crossglassonoffglassonglasscross-
on		onglassononcross-
off		offcross-
on		cross-
off		offcross-
off		cross-
off		crosscross-
on		crosscross-
off		cross-
off		cross-
off		crossoncross-
on
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
n/a
n/a
n/a
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n/a
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Thursday
03
Friday
04
Saturday
05
Sunday
06
Monday
07
Tuesday
08
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Sunrise6:07--6:07--6:07--6:09--6:09--6:11--6:11--6:11--6:13--6:13--6:15--6:16--
Sunset-9:53--9:53--9:53--9:52--9:52--9:52--9:52--9:51--9:51--9:50--9:49--9:49-
clearclearpart cloudrain showersthunderstorm clearpart cloudthunderstorm light raincloudpart cloudpart cloudcloudcloudpart cloudcloudpart cloudpart cloudpart cloudpart cloudpart cloudpart cloudpart cloudpart cloudcloudcloudmod rainrain showerspart cloudcloudpart cloudpart cloudclearclearpart cloudheavy rain
Rain (mm)
---15--42-----------------61-------27
Temp. °C171819232526242215121414151614121312131414212019191918171813161717171818
Feels °C (?)161516232826242212121214151613101111121214221919181918161611141416161716

Short Range Forecast: Moderate rain (total 12mm), heaviest on Fri afternoon. Warm (max 26°C on Fri night, min 11°C on Sat night). Wind will be generally light.

Days 3-6 Weather Summary Mostly dry. Very mild (max 16°C on Mon afternoon, min 9°C on Tue night). Wind will be generally light.

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

Long Range Forecast: Heavy rain (total 32mm), heaviest during Mon night. Very mild (max 18°C on Sat afternoon, min 10°C on Sat night). 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)
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View detailed surf forecast for Ontonagon at:
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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.

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