Boat Basin Lefts Surf Break

Lat Long: 13.48° N 144.75° E

GUAM

Boat Basin Lefts 48 hour detailed Surf Forecast

Issued: 3 am 20 Sep 2026 (local time)

Forecast update in  hr  min

Today's Boat Basin Lefts sea temperature is
29.8°C
0.5° 

Boat Basin Lefts surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


How big are the waves at Boat Basin Lefts today (20 Sep):

  • Morning surf: Morning surf (20 Sep, local time) - 2.5ft (0.8m), 9s period with NNW swell.
  • Afternoon surf: Afternoon surf (20 Sep, local time) - 3.5ft (1.0m), 10s period with NNW swell.
  • Evening surf: Evening surf (20 Sep, local time) - 3ft (0.9m), 10s period with NNW swell.

The current surf forecast for Boat Basin Lefts at 10AM is: 0.9m 10s primary swell from a North-northwest direction (forecast issued at 03:00am September 20). An open ocean swell of 1.1m 8s is not directed at the surf break. The wind direction is predicted to be cross-onshore.

Time (ChST) & DateWave HeightWave Period
Morning (20 Sep)2.5ft (0.8m)9s
Afternoon (20 Sep)3.5ft (1.0m)10s
Evening (20 Sep)3ft (0.9m)10s

Table - waves today at Boat Basin Lefts. (Swell directed towards the surf break)


Short Range Forecast

Heavy rain (total 34mm), heaviest during Sun afternoon. Warm (max 29°C on Sun morning, min 26°C on Mon morning). Winds increasing (calm on Mon morning, fresh winds from the SE by Tue morning).

Sunday
20
Monday
21
Tuesday
22
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
1 AM
4 AM
7 AM
10 AM
1 PM
4 PM
7 PM
10 PM
Rating
(10 max)
1
0
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1
1
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.8
NNW
8
0.8
NNW
8
0.7
NNW
8
0.9
NNW
10
1
NNW
10
1
NNW
10
0.9
NNW
10
0.9
NNW
10
0.9
NNW
10
1
NNW
10
1
NNW
10
0.9
NNW
10
0.9
NNW
10
0.7
NE
12
0.7
NE
12
0.7
NE
11
0.9
NNW
10
0.9
NNW
10
0.8
NNW
10
0.9
NNW
10
0.8
NNW
10
0.9
NNW
10
0.9
NNW
13
1
NNW
13
Wave Graph
Metric surfscale
Energy kJ
90
92
72
157
236
218
176
173
140
186
198
157
154
142
137
121
145
160
133
163
133
166
304
357
Wind (km/h)
5
W
5
WSW
5
WNW
5
WSW
10
WSW
5
NW
5
W
5
ESE
5
WNW
5
NNE
5
SSE
10
SSW
0
SW
5
SSW
5
SSW
5
S
10
SSE
10
SE
15
ESE
25
ESE
35
SE
30
SE
30
SSE
30
SE
Wind State
glassy
cross
glassy
cross-on
cross-on
glassy
glassy
glassy
glassy
glassy
glassy
cross-off
glassy
glassy
cross-off
cross-off
off
off
off
off
off
off
off
off
High Tide
11:50PM0.76m
5:02PM0.75m
00:58AM0.74m
5:44PM0.77m
2:29AM0.73m
6:12PM0.80m
Low Tide
8:25AM0.26m
9:08PM0.70m
9:29AM0.26m
10:30PM0.68m
10:26AM0.25m
thunderstorm
part cloud
part cloud
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
thunderstorm
cloud
thunderstorm
part cloud
clear
thunderstorm
part cloud
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
6:09
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:19
6:17
6:16
 mm
1
2
9
2
1
5
1
1
2
1
2
1
Temp °C
28
28
28
29
29
28
28
27
27
28
28
26
27
28
28
27
27
27
27
28
28
28
28
28
Feels °C
33
32
33
33
33
32
33
32
32
33
33
29
32
33
32
31
31
30
30
29
27
27
27
28
  • 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
How to use the Wavefinder 

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 Boat Basin Lefts 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.


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