Right and Left Side Surf Break

Lat Long: 13.48° N 144.75° E

GUAM

Right and Left Side Surf Forecast and Surf Report

Issued: 9 pm 18 Aug 2026 (local time)

Forecast update in  hr  min

Today's Right and Left Side sea temperature is
29.2° C
0.1° 

Right and Left Side surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Right and Left Side surf forecast from 18 Aug 2026:

  • Best quality surf: Friday 21 Aug, 1AM (local time) - 1.5ft (0.5m), 8s period, W swell with cross-offshore winds.
  • Most powerful swell: Wednesday 26 Aug, 4AM (local time) - 3.5ft (1.1m), 11s period, NW swell with 308 kJ wave energy.
  • Next surfable swell (1★+): Friday 21 Aug, 1AM (local time) - 1.5ft (0.5m), 8s period with W swell.

Best Forecast Surf Conditions for Right and Left Side this week:

The surf forecast for Right and Left Side over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 1AM. The primary swell is predicted to be 0.5m and 8s period with a secondary swell of 0.6m and 6s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Right and Left Side in the next 16 days are 1.1m 11s and forecast to arrive on Wednesday (Aug 26) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 9s period and expected on Monday (Aug 24) at 1AM.

Wave TypeTime (ChST) & Date Wave Height & Period
Next good surf (1 star+) 1AM (Fri 21st Aug)1.5ft (0.5m) 8s
Best Surf 1AM (Fri 21st Aug)1.5ft (0.5m) 8s
Most Powerful 4AM (Wed 26th Aug)3.5ft (1.1m) 11s

Table - best surf conditions forecast for Right and Left Side over the next 16 days.


The Lowdown

G’day, Rusty here. Look, I’m gonna level with you—Right and Left Side has been a bit of a dud lately, and the next week and a half is pretty quiet. But if you’re patient, there’s a proper pulse of groundswell coming through in the second week that’ll make the wait worthwhile. This is a reef break, so when it turns on, it’s a serious wave, but you’ll need to be on your game.

Right now, we’re in a flat spell. Wednesday the 19th and Thursday the 20th are a write-off—cross-onshore winds and messy, weak swell. Friday the 21st is the first time you’d even bother looking. The morning sees a tiny 2ft swell from the west with a 9-second period, but the wind is light cross-offshore, keeping it clean. The afternoon goes glassy with the same tiny 2ft. It’s not exciting, but it’s surfable. Then it gets blown out again from Saturday the 22nd right through to Tuesday the 27th. Strong cross-shore winds and lumpy conditions—honestly, more of a kitesurfing setup than a paddle session for most of that run.

Wednesday the 26th sees the swell start to build, but the wind is still messy. By Thursday the 27th afternoon, there’s a 6ft swell from the west, but with a 35 km/h cross-onshore, it’s a choppy mess. The energy is building though—650 (moderate wave energy). That trend continues into the end of the month with bigger but wind-affected surf.

Now, here’s the good stuff. From Sunday the 30th of August into the start of September, we get a solid long-period groundswell. On Sunday morning, it’s 10ft from the west at 12 seconds, with a light cross-offshore breeze and clean conditions. The combined energy is already strong at 2539. The afternoon is similar at 10ft and 13 seconds, clean again. This is expert territory—over 8ft, so beginners stay out.

The absolute standout is Monday the 31st of August. We’re looking at a 12ft west swell with a 13-second period—that’s proper groundswell. The morning has a light cross-offshore breeze, the afternoon goes glassy. Combined energy is 3991 and 4611 respectively—very strong. This is the best window of the whole forecast. The swell direction (west) matches the optimum (north), so it’ll wrap in nicely on the reef. Expect clean, powerful, hollow waves. Crowds are possible here (listed as “sometimes”), so get in early.

Into Tuesday the 1st of September, the swell peaks at 13ft from the west-northwest with a 14-second period, but the wind turns cross-onshore and the energy is massive (6406). It’s marginal due to wind, but for experts only. Wednesday the 2nd and Thursday the 3rd drop back to 10ft but with clean offshore winds—excellent conditions for those who know the reef.

So, the first week is a bust. The real window is from Sunday the 30th of August through to Thursday the 3rd of September, with Monday the 31st being the absolute pick. Keep an eye on it.

Rusty.

Short Range Forecast

Light rain (total 7mm), mostly falling on Tue night. Warm (max 29°C on Wed morning, min 27°C on Wed night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 20mm), heaviest during Mon morning. Warm (max 29°C on Sat morning, min 27°C on Sun afternoon). Winds increasing (light winds from the WNW on Fri night, strong winds from the SW by Sun afternoon).

Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1
W
8
0.9
W
8
1.2
WNW
8
0.8
WNW
9
0.8
WNW
9
0.6
WNW
8
0.5
W
8
0.5
W
9
0.5
W
9
0.5
W
8
0.5
W
10
0.5
W
9
0.7
NE
8
0.9
NNE
7
0.8
NNE
8
0.6
WNW
5
0.7
NW
7
0.7
NNW
8
0.7
NW
9
Wave Graph
Metric surfscale
Energy kJ
136
113
194
101
103
55
34
41
40
36
49
42
72
86
66
19
50
52
83
Wind (km/h)
15
NW
25
NNW
20
NNE
10
NE
10
NNE
15
N
5
ENE
5
ENE
5
NW
10
W
20
W
20
W
20
WSW
30
SW
35
SSW
35
SSW
25
SW
20
SW
10
S
Wind State
on
cross-on
cross-on
cross
cross
cross-on
cross-off
cross-off
glassy
cross-on
cross-on
cross-on
cross
cross
cross-off
cross-off
cross
cross
cross-off
High Tide
11:17PM0.87m
1:14PM0.71m
11:43PM0.84m
2:50PM0.69m
00:13AM0.82m
4:40PM0.70m
00:52AM0.79m
5:59PM0.73m
1:47AM0.78m
6:41PM0.76m
2:57AM0.78m
7:12PM0.79m
Low Tide
6:29AM0.29m
5:46PM0.59m
7:21AM0.28m
6:24PM0.65m
8:19AM0.26m
7:23PM0.69m
9:20AM0.25m
9:03PM0.71m
10:19AM0.22m
10:36PM0.71m
11:11AM0.20m
11:37PM0.69m
thunderstorm
thunderstorm
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rain showers
thunderstorm
part cloud
clear
part cloud
thunderstorm
part cloud
part cloud
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:07
6:07
6:07
6:07
6:07
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:39
6:39
6:38
6:38
6:37
6:37
 mm
2
1
2
1
1
2
2
4
1
6
5
25
Temp °C
28
29
29
28
29
29
28
29
29
28
29
29
28
29
28
28
28
28
27
Feels °C
31
30
31
32
33
32
32
34
34
32
32
31
31
29
27
29
29
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)
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Information about the Right and Left Side Surf forecast

The above surf forecast table for Right and Left Side provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Right and Left Side can be found by selecting the local surf guide option on the grey menu. Our Right and Left Side 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 (Right and Left Side) 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 Right and Left Side 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.

Right and Left Side is 1 km (1 miles) from Agana. If you plan a holiday in Guam, look for hotels and other accommodation in Agana. Agana has rooms for a wide range of budgets as well as car hire and transport links.

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