Surf Forecasts:
Right and Left Side surf forecast from 16 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 1AM (local time) - 5ft (1.6m), 8s period, W swell with glassy winds.
- Most powerful swell: Saturday 22 Aug, 4PM (local time) - 5ft (1.6m), 12s period, ENE swell with 746 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 1AM (local time) - 5ft (1.6m), 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 Tuesday (Aug 18) at 1AM. The primary swell is predicted to be 1.6m and 8s period with a secondary swell of 0.4m and 9s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Right and Left Side in the next 16 days are 1.6m 12s and forecast to arrive on Saturday (Aug 22) at 4PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 9s period and expected on Monday (Aug 24) at 4AM.
| Wave Type | Time (ChST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Tue 18th Aug) | 5ft (1.6m) 8s |
| Best Surf | 1AM (Tue 18th Aug) | 5ft (1.6m) 8s |
| Most Powerful | 4PM (Sat 22nd Aug) | 5ft (1.6m) 12s |
Table - best surf conditions forecast for Right and Left Side over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s on the cards for Right and Left Side.
Right off the bat, the first week is a real struggle. There’s a stretch of poor to ordinary conditions right through until the end of this week. Monday morning and afternoon on the 17th are a write-off – cross and cross-onshore winds from the SW at 12 mph making a mess of the 4 ft west swell, and the energy is weak (226). Tuesday morning the 18th is the first real glimmer of hope: a clean 4 ft west swell, NE wind at 3 mph and glassy conditions – that’s about as good as it gets for a little while. But it’s short-lived, as the wind swings onshore later in the day and the rest of the week goes downhill again. The water temperature is sitting at 85°, which is about average for this time of year, so that’s fine.
The 22nd of August brings a change. Saturday morning we get a 4 ft swell from the ENE with moderate wave energy (514) and a cross-shore breeze, but it’s still marginal due to tide and the cross-chop. By Saturday afternoon the swell builds to 5 ft (ENE, 12 seconds) and energy jumps to 790, but the wind picks up to 16 mph from the SW, so it’s lumpy. Not a standout by any stretch.
Sunday the 23rd gets messy again with 22 mph winds, so that’s a skip.
Then we hit the end of the month – and this is where it gets serious. The 27th of August, Thursday afternoon, we see a 10 ft WNW swell rolling in with an onshore wind, but the period is 8 seconds – short period, not ideal for this exposed reef. Energy is very strong at 1228. That’s expert territory.
The real heavy stuff arrives from the 28th onwards. Friday the 28th sees 12 ft WNW swells, very strong energy reading over 2000 (2015 and 2021), but the cross winds are fresh at 22 mph, so it’s lumpy and challenging. This is for experienced surfers only, and even then, the quality is going to be rough.
Then we get a small breather on the 29th and 30th – a 4 ft NW swell on Saturday morning with clean, cross-off winds from the SSW at 19 mph. That’s clean and ridable for the confident surfer, but the swell size is modest.
But hold on – the standout is on the 30th of August (Sunday afternoon) and the 31st (Monday). On the 30th, the swell jumps to 13 ft from the west at 12 seconds, with very strong energy (4031). Monday the 31st hits 12 ft from the west, also 12 seconds, with energy at 5277 – that’s huge. Winds are cross-shore from the SW at 12 mph, which is manageable, but these are big, powerful waves. The period is 12 seconds, so there’s real groundswell energy and long lulls between sets. This is not a beginner or even intermediate wave – it’s a serious, expert-only session at Right and Left Side. The swell direction (west) is not the optimum north, but the sheer size and power make it the best window in the entire 16 days.
If you’re after the absolute best: the cleanest, most user-friendly window is still Tuesday morning the 18th – that 4 ft, glassy, clean west swell – but for raw power and size, the 30th and 31st are the real standouts, though they come with a lot of risk.
The reef here is inconsistent and can be fickle, but when it fires, it can be magic. The long-range standouts are promising but less certain.
So to wrap up: if you want clean and small, hit the 18th. If you want heavy and big, keep an eye on the 30th and 31st. The rest is either blown out or too small to bother.
Rusty.
Short Range ForecastHeavy rain (total 25mm), heaviest during Wed morning. Warm (max 29°C on Tue morning, min 27°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Sat night. Warm (max 29°C on Thu morning, min 27°C on Thu night). Winds increasing (calm on Fri afternoon, fresh winds from the SSW by Sat night). | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 9 | W 8 | W 9 | WNW 10 | W 10 | W 10 | E 14 | ENE 11 | ENE 12 | NE 12 | NNE 12 | NNE 12 | N 11 |
Wave Graph | |||||||||||||||||||||
202 | 245 | 307 | 190 | 163 | 136 | 113 | 140 | 119 | 140 | 85 | 94 | 96 | 67 | 411 | 446 | 746 | 442 | 330 | 505 | 363 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | glassy | glassy | cross-on | on | cross-on | cross-on | cross-on | cross | cross | cross-off | glassy | glassy | cross-on | cross | cross | cross-off | cross | cross | cross-off |
High Tide | 10:51AM0.79m | 10:52PM0.89m | 11:57AM0.74m | 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 | |||||||
Low Tide | 4:38PM0.43m | 5:41AM0.32m | 5:12PM0.52m | 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 | ||||||||
6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | |
— | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:39 | — | — | 6:38 | — | — | 6:38 | — | — | 6:37 | — | |
mm | 1 | 4 | 2 | — | — | 5 | 9 | 3 | 1 | — | — | — | 1 | 2 | 1 | — | — | 3 | 3 | 3 | 14 |
Temp °C | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 28 |
Feels °C | 30 | 29 | 32 | 33 | 33 | 31 | 30 | 30 | 31 | 33 | 32 | 32 | 34 | 34 | 33 | 32 | 30 | 30 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | W 8 | NE 9 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 9 | W 8 | W 9 | WSW 9 | WSW 9 | WSW 9 | E 14 | ENE 11 | ENE 12 | NE 12 | SSE 9 | SSE 9 | S 9 |
202 | 22 | 307 | 190 | 163 | 136 | 113 | 140 | 119 | 140 | 85 | 80 | 80 | 77 | 411 | 446 | 746 | 442 | 294 | 326 | 412 | |
Swell 2 Height (m) Direction Period (s) | NE 10 | E 9 | NE 9 | NE 9 | SE 9 | SE 9 | SE 9 | SE 9 | WNW 9 | SE 9 | WSW 8 | WNW 10 | W 10 | W 10 | W 9 | SSE 9 | SE 9 | SSE 9 | NNE 12 | NNE 12 | N 11 |
24 | 13 | 21 | 20 | 20 | 42 | 41 | 42 | 44 | 41 | 73 | 94 | 96 | 67 | 63 | 53 | 75 | 121 | 330 | 505 | 363 | |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 9 | E 8 | SE 9 | NE 9 | NE 9 | NE 8 | NE 8 | SE 9 | WNW 10 | N 5 | NNE 6 | NNE 7 | NE 7 | E 10 | W 10 | W 9 | W 9 | WSW 8 | SW 9 | WNW 8 |
14 | 14 | 12 | 21 | 20 | 19 | 18 | 18 | 41 | 31 | 18 | 24 | 32 | 39 | 72 | 68 | 44 | 40 | 35 | 42 | 22 | |
Wind waves Height (m) Direction Period (s) | — | W 8 | — | — | — | — | NNW 4 | NNW 4 | N 4 | N 5 | — | — | — | — | — | — | SW 8 | WSW 4 | — | — | SW 8 |
— | 245 | — | — | — | — | 9 | 12 | 20 | 15 | — | — | — | — | — | — | 65 | 18 | — | — | 112 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 230 | 230 | 0 | 0 | 2068 | 11 | 2068 | 2077 | 11 | 1289 | 23 | 0 | 0 | 0 | 11 | 11 | 2065 | 1958 | 1995 | 1905 | 1835 |
Best forecast wave conditions in Guam | |||||||||||||||||||||
Best forecast wave conditions in Guam | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.











