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Surf Forecasts:

Union Bay surfForecast / Lake Superior / USA

information circle48hr Weather and Surf, issued 7 pm Thursday 18 Sep 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
17.1° C
 (Which is 4.1°C warmer than normal for this time of year)

How big are the waves at Union Bay today?

The current surf forecast for Union Bay at 9PM is: 0.7m 5s primary swell from a East-northeast direction (forecast issued at 07:00pm September 18). The wind direction is predicted to be cross-shore.

Time (EDT) & DateWave HeightWave Period
Morning (18 Sep)--
Afternoon (18 Sep)3.5ft (1.1m)5s
Evening (18 Sep)2.5ft (0.7m)5s

Table - waves today at Union Bay. (Swell directed towards the surf break)

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table
Thursday
18
Friday
19
Saturday
20
Sunday
21
5 PM8 PM11 PM2 AM5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM5 AM8 AM11 AM2 PM5 PM8 PM11 PM2 AM5 AM8 AM11 AM2 PM
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
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.9
ENE
0.8
ENE
0.7
ENE
0.7
ENE
0.8
ENE
0.9
ENE
1.2
E
1.3
E
1.5
E
1.6
E
1.5
E
1.3
E
1
E
0.9
ESE
0.9
ESE
0.9
ESE
0.9
ESE
0.3
E
0.4
E
0.4
E
0.3
E
0.3
E
0.3
E
0.2
E
Period(s) (?)555445566666555555666665
Wave
Graph
(?)Metric surfscale
Energy kJ (?)44312219263878110156190159000000511117662
Wind
(km/h)
25
NE
25
ENE
20
E
15
E
15
E
15
E
15
E
25
ENE
20
ENE
20
E
20
ESE
20
ESE
20
SE
20
SE
15
SE
15
SSE
10
SE
15
SSE
10
SE
15
SSE
10
S
10
S
5
SSW
0
NW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		crosscrosscrosscrosscrosscrosscrosscrosscrosscross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		offcross-
off		offoffoffcross-
off		glass
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
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
n/a
n/a
n/a
n/a
n/a
n/a
Thursday
18
Friday
19
Saturday
20
Sunday
21
Sunrise-----7:39-------7:41-------7:43--
Sunset-8:05-------8:02-------8:00------
part cloud
part cloud
part cloud
part cloud
cloud
cloud
cloud
cloud
cloud
part cloud
clear
cloud
light rain
light rain
cloud
rain showers
light rain
cloud
part cloud
part cloud
part cloud
cloud
cloud
thunderstorm
Rain (mm)
------------11-11------1
Temp. °C191715151515162019171514141517182018181717171820
Feels °C (?)151412121213131617141211111316172017181617171922
  • 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 Continuing clean conditions at Union Bay (calm at BUOY-OTNM4 23 km from Union Bay). not gfswave

    1 hour 32 minutes ago Union Bay
Expand
<
>
View all

23 km away, 1 h 32 min ago

2 km/h
SE
17.4
17.1
Air / Water (°C)
Please reload the page to see if there are any updates.

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View detailed surf forecast for Union Bay at:
surf-forecast.com

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