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Surf Forecasts:

Union Bay surfForecast / Lake Superior / USA

information circle12 Day Weather and Surf, issued 7 am Monday 20 Oct 2025 EDT
Forecast update in hr  min  s Forecast update imminent
Union Bay surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Union Bay sea temperature is
12.8° C
 (Which is 5.5°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Union Bay this week:

The most powerful waves expected at Union Bay in the next 12 days are 1.8m 6s and forecast to arrive on Tuesday (Oct 21) at 11PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Monday (Oct 20) at 8PM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Tue 21st Oct)6ft (1.8m) 6s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Heavy rain (total 29mm), heaviest during Tue night. Very mild (max 16°C on Mon afternoon, min 7°C on Wed morning). Winds increasing (light winds from the S on Mon morning, fresh winds from the WNW by Tue afternoon).

Days 3-6 Weather Summary Mostly dry. Very mild (max 12°C on Sat afternoon, min 3°C on Sat morning). Wind will be generally light.

Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
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 (?)
0.3
SSE
1.4
ESE
1.6
SSW
0.1
E
1.1
NNW
1.7
N
1.3
NNW
1.1
NNW
1
NNW
0.8
NNW
0.5
NW
0.2
NNW
0.2
WNW
0.2
SSW
0.4
SE
0.5
SSE
0.5
SE
0.7
SSE
———
Period(s) (?)256656554443223444---
Wave
Graph
(?)Metric surfscale
Energy kJ (?)0001591857854402261100000000
Wind
(km/h)
15
S
25
SSE
20
SW
35
W
35
WNW
35
N
25
NNW
25
NW
30
NW
25
NW
25
NW
20
NW
15
NW
10
WNW
10
SSE
10
SSE
10
ESE
15
S
15
SSE
10
SE
10
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offcross-
off		cross-
off		crosscrossononcross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		crosscross-
off		cross-
off		cross-
off		offcross-
off		cross-
off		cross-
off
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
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
Sunrise8:22--8:23--8:25--8:26--8:27--8:29--8:30--
Sunset-7:02--7:00--6:59--6:57--6:55--6:53--6:52-
cloud
cloud
mod rain
cloud
light rain
heavy rain
light rain
light rain
light rain
cloud
cloud
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
Rain (mm)
--7-213223------------
Temp. °C11161599108877776656121091611
Feels °C (?)61092131210101222965137
  • 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 offshore at Union Bay (light winds from the S at BUOY-OTNM4 23 km from Union Bay). not gfswave

    1 hour 18 minutes ago Union Bay
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23 km away, 1 h 18 min ago

13 km/h
S
7.1
12.8
Air / Water (°C)
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 Union Bay 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 Union Bay at:
surf-forecast.com

Information about the Union Bay Surf forecast

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

Union Bay is 173 km (107 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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