Umatac Surf Forecast

/ Guam (16 surf breaks) /

Guam (16 surf breaks)

Surf Forecasts:

Umatac surfForecast / Guam / Guam

48hr Weather and Surf, issued 3 am Tuesday 21 Oct 2025 ChST

Forecast update in hr min s Forecast update imminent

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

Today's Umatac sea temperature is 29.3° C
(Which is normal for this time of year)

How big are the waves at Umatac today?

The current surf forecast for Umatac at 9AM is: 1.0m 10s primary swell from a North direction (forecast issued at 03:00am October 21). An open ocean swell of 0.4m 10s is not directed at the surf break, a second open ocean swell of 1.2m 8s is not directed at the surf break. The wind direction is predicted to be offshore and the swell rating is 2.

Time (ChST) & Date	Wave Height	Wave Period
Morning (21 Oct)	3.5ft (1.0m)	10s
Afternoon (21 Oct)	3ft (0.9m)	12s
Evening (21 Oct)	3ft (0.9m)	11s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Tuesday 21								Wednesday 22								Thursday 23
	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	1	2	2	2	2	2	2	0	0	0	1	1	1	1	1	1	0	0	1	1	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE	NNE
Period(s) (?)	12	11	10	10	12	12	12	11	11	11	11	10	10	10	10	10	10	10	10	10	10	10	10	10
Wave Graph (?)
kJ (?)	140	167	184	227	293	242	233	210	167	164	164	125	114	111	88	86	86	85	56	64	64	54	55	36
Wind (km/h)	ESE	ESE	SE	ESE	SE	SE	ESE	ESE	SE	SE	SE	SE	ESE	ESE	E	E	ESE	E	E	E	ESE	ESE	E	ESE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	off	off	off	off	off	off	off	off	cross- off	cross- off	cross- off	off	off	off	off	off	off	cross- off	cross- off	off	off	off	off	off
High Tide / height (m)				7:56AM 0.67				7:15PM 0.69				8:38AM 0.68				7:33PM 0.68				9:19AM 0.69				7:52PM 0.66
Low Tide / height (m)		1:27AM 0.08				1:33PM 0.30				1:55AM 0.04				2:07PM 0.35				2:23AM 0.01				2:40PM 0.40

	Tuesday 21								Wednesday 22								Thursday 23
Sunrise	-	-	6:11	-	-	-	-	-	-	-	6:11	-	-	-	-	-	-	-	6:11	-	-	-	-	-
Sunset	-	-	-	-	-	5:59	-	-	-	-	-	-	-	5:59	-	-	-	-	-	-	-	5:58	-	-

Rain (mm)	-	1	-	-	-	-	-	1	2	1	2	-	1	3	3	1	2	-	-	-	1	1	1	3
Temp. °C	28	28	29	29	29	29	28	28	28	28	28	29	29	29	28	28	28	27	27	28	28	29	28	28
Feels °C (?)	29	29	31	30	30	31	30	30	29	29	30	32	32	32	31	31	29	28	28	29	29	31	30	31

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 Umatac (light winds from the ESE at BUOY-APRP7 17 km from Umatac). 0.8m 11s groundswell from the N with a 0.5m 7s swell from the NNE. 2 swells combining to make bigger set waves.
1 hour 33 minutes ago Umatac

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17 km away, 1 h 33 min ago

9 km/h

ESE

0.0

29.3

Air / Water (°C)

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