Boat Basin Lefts Surf Forecast

/ Guam (16 surf breaks) /

Guam (16 surf breaks)

Surf Forecasts:

Boat Basin Lefts surfForecast / Guam / Guam

48hr Weather and Surf, issued 3 am Thursday 18 Sep 2025 ChST

Forecast update in hr min s Forecast update imminent

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

Today's Boat Basin Lefts sea temperature is 29.8° C
(Which is slightly warmer than usual)

How big are the waves at Boat Basin Lefts today?

The current surf forecast for Boat Basin Lefts at 8AM is: 0.3m 9s primary swell from a East-northeast direction (forecast issued at 03:00am September 18). An open ocean swell of 0.8m 5s is not directed at the surf break, a second open ocean swell of 0.4m 10s is not directed at the surf break. The wind direction is predicted to be offshore.

Time (ChST) & Date	Wave Height	Wave Period
Morning (18 Sep)	1.5ft (0.4m)	8s
Afternoon (18 Sep)	2.5ft (0.7m)	8s
Evening (18 Sep)	1ft (0.3m)	11s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Thursday 18								Friday 19								Saturday 20
	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)	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 (?)	NE	ENE	ENE	NE	ENE	E	E	ENE	ENE	ENE	E	E	E	E	ENE	E	E	ENE	N	E	E	N	ENE	E
Period(s) (?)	9	9	9	8	11	8	8	11	11	11	5	5	5	5	10	9	9	10	10	9	9	9	9	5
Wave Graph (?)
kJ (?)	19	15	15	18	23	69	88	23	40	22	23	18	18	12	20	14	15	19	8	13	14	6	8	34
Wind (km/h)	ESE	ESE	ESE	ESE	E	E	E	ESE	ESE	ESE	E	N	NNE	NNE	NNE	NE	NE	NE	ENE	ENE	ENE	ENE	E	E
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	off	cross- off	off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- on	cross- on	cross- on	cross	cross	cross	cross	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off
High Tide / height (m)		3:28AM 0.79					6:36PM 0.84				4:46AM 0.80					7:03PM 0.85			5:52AM 0.82					7:26PM 0.86
Low Tide / height (m)	11:04PM 0.67				11:07AM 0.18				11:57PM 0.62				11:58AM 0.20				12:39AM 0.55				12:42PM 0.24

	Thursday 18								Friday 19								Saturday 20
Sunrise	-	-	6:09	-	-	-	-	-	-	-	6:09	-	-	-	-	-	-	-	6:09	-	-	-	-	-
Sunset	-	-	-	-	-	6:20	-	-	-	-	-	-	-	6:19	-	-	-	-	-	-	-	6:19	-	-

Rain (mm)	-	3	-	-	-	2	-	-	1	3	5	4	-	-	3	5	1	2	-	-	1	2	1	1
Temp. °C	27	26	27	27	28	28	28	28	28	27	27	27	27	28	27	27	27	27	28	28	28	28	28	28
Feels °C (?)	27	27	31	30	29	29	29	29	30	30	31	29	28	29	27	28	29	29	30	29	30	31	31	30

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for Guam

Wind Update Continuing clean conditions at Boat Basin Lefts (calm at Tamuning 3 km from Boat Basin Lefts). 0.5m 8s swell from the ENE with a 0.3m 11s groundswell from the E. 2 swells combining to make bigger set waves.
56 minutes ago Boat Basin Lefts

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Actual: 56 min ago

0 km/h

Clean

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