Union Bay surfForecast / Lake Superior / USA

information circle16 Day Weather and Surf, issued 1 am Saturday 21 Mar 2026 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
0.6° C
(Which is 1.1°C colder than average for this time of year)

Best Forecast Surf Conditions for Union Bay this week:

The surf forecast for Union Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Mar 25) at 2PM. The primary swell is predicted to be 1.6m and 7s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Union Bay in the next 16 days are 1.9m 6s and forecast to arrive on Thursday (Mar 26) at 2PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 6s period and expected on Thursday (Mar 26) at 2AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+) 2PM (Wed 25th Mar)5ft (1.6m) 7s
Best Surf 2PM (Wed 25th Mar)5ft (1.6m) 7s
Most Powerful 2PM (Thu 26th Mar)6ft (1.9m) 6s

Table - best surf conditions forecast for Union Bay over the next 16 days.


Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Icy conditions (max 6°C on Sat afternoon, min -6°C on Sun night). Winds increasing (calm on Sun night, fresh winds from the SW by Mon night).

Days 3-6 Weather Summary A light fall of snow, heaviest on Wed morning. Turning milder with light rain (total 3mm) on Wed afternoon. Icy conditions (max 6°C on Wed night, min -4°C on Thu night). Winds decreasing (fresh winds from the W on Wed night, light winds from the N by Thu night).

Saturday
21
Sunday
22
Monday
23
Tuesday
24
Wednesday
25
Thursday
26
Friday
27
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.6
ESE
0.7
ESE
1.3
NE
1.6
NE
1
ENE
0.4
ENE
0.2
ENE
0.3
SW
1.4
SSW
1.2
W
0.6
WNW
1.1
NNE
1.6
ENE
1.6
E
0.5
E
0.1
E
1.7
WNW
1.7
NW
Period(s) (?)445675435544677666---
Wave
Graph
(?)Metric surfscale
Energy kJ (?)0076172991120001147194247231202182000
Wind
(km/h)
15
SE
10
WNW
30
NNE
25
NE
20
NNE
5
SW
10
W
5
W
25
SSW
15
WNW
20
ENE
20
E
25
SE
15
S
20
WNW
30
NNW
20
NNW
10
N
15
NW
20
WNW
30
NW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
crosscross-
on
cross-
on
cross-
on
glasscrossglassoffcross-
on
crosscrosscross-
off
offcross-
on
onononcross-
on
crosscross-
on
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
Saturday
21
Sunday
22
Monday
23
Tuesday
24
Wednesday
25
Thursday
26
Friday
27
Sunrise8:00--7:58--7:56--7:54--7:52--7:50--7:48--
Sunset-8:10--8:13--8:14--8:15--8:16--8:17--8:20-
cloud
cloud
cloud
cloud
cloud
part cloud
part cloud
clear
part cloud
light snow
cloud
light snow
mod snow
light rain
part cloud
part cloud
cloud
part cloud
cloud
cloud
light snow
Rain (mm)
-------------3-------
Temp. °C462-2-3-3-22421-2-1462-2-2-3-1-1
Feels °C (?)03-3-10-10-8-7-1-5-3-5-8-802-6-9-7-9-7-9
  • 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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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 16 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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