Surf Forecasts:
Rhosneigr surf forecast from 18 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 1AM (local time) - 3.5ft (1.1m), 6s period, SW swell with 95 kJ wave energy.
Best Forecast Surf Conditions for Rhosneigr this week:
The most powerful waves expected at Rhosneigr in the next 16 days are 1.1m 6s and forecast to arrive on Thursday (Aug 20) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Thursday (Aug 20) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Thu 20th Aug) | 3.5ft (1.1m) 6s |
Table - best surf conditions forecast for Rhosneigr over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s be straight with you. The next week and a half is looking pretty grim for a paddle. We’ve got a lot of onshore wind and hardly any size. It’s one of those stretches where you might be better off sorting out your quiver or fixing that leaky wetsuit.
The good news? There is a pulse of proper swell waiting at the end of the tunnel. The real standout window looks like it’s going to be the 1st of September. Mark that in your calendar.
Let’s run through it. We start off with nothing but ankle-biters. Monday the 17th we’ve got a tiny 1 ft dribble at Rhosneigr (Anglesey) with a light cross-onshore breeze. Water temp is sitting at 65°F, which is a notable 4°F warmer than average for this time of year – a nice little bonus if you do get in, but the surf is woeful.
The 18th through to the 25th is basically dead. We’re looking at waves mostly under 4 ft, with the wind swinging all over the place. A lot of these days are cross-onshore or onshore, making a mess of things. On the morning of the 20th there’s a brief window with a cross-offshore breeze cleaning up a tiny 2 ft wave, but it’s not worth getting excited about. The energy is weak, with values barely hitting double digits. The swell periods are short too, around 5-6 seconds, which just means crumbly, weak surf. It’s a long, flat, and lumpy gap. There’s really nothing rideable here until things change.
Finally, things start to turn around on the 26th of August. It’s still not great, but it’s surfable. The morning brings a light cross-offshore breeze with a 4 ft SSW swell, though the period is a short 5 seconds. The combined energy ticks up to 112, which is at least moderate. The afternoon is better; the wind drops to glassy (0 mph), and there’s a 4 ft SSW swell with a slightly better 8-second period. The energy reading climbs to 151. It’s clean, but it’s a mushy, unremarkable wave. This is a 1/10 kind of day, just to get wet.
The 27th and 28th see the energy jump around, but the wind and the direction are all wrong. The 28th throws up a 4 ft swell with a cross-onshore fresh breeze and lumpy conditions. Energy hits 198 but it’s onshore junk.
Then we get the big change. The 29th of August brings the first real size, 6 ft, but it’s still messy with a cross-onshore wind and choppy conditions. The energy is strong at 280, but it's not clean. The 31st sees a beast of a swell roll in, hitting 10 ft in the afternoon with a strong 1028 energy reading. But it’s pinned with a 22 mph onshore wind. The sea is going to be a washing machine – this is definitely not for beginners. At this size, it’s only for experts anyway, and with that wind, even they’ll be struggling. It might look interesting for the kite surfers, not so much for us.
But then, hold on to your board shorts. On the morning of Tuesday the 1st of September, it all comes together. The wind swings offshore (NE at 6 mph) and it’s clean. We’ve got a 8 ft WSW swell with a 7-second period. The combined energy is strong at 499. This is the standout of the entire 16-day window. It’s a solid, powerful wave, and with that offshore wind, Rhosneigr is going to be firing. This is one to get on. Just be aware, 8 ft is pushing into expert territory, especially with the short period. It’s going to be a proper handful. The afternoon on the 1st looks like it will get blown out by a fresh onshore breeze, so the morning session is your window.
So, there you have it. A long flat spell, some rough and messy days, but one promising morning on the 1st that should be worth the wait. Forecasts are more reliable for the near term, so keep an eye on the charts closer to the time.
Rusty, out.
Short Range ForecastModerate rain (total 14mm), heaviest on Mon night. Very mild (max 18°C on Mon night, min 14°C on Tue night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Thu night. Very mild (max 17°C on Sat morning, min 13°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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) | SW 5 | SW 4 | W 4 | SW 6 | WSW 4 | WSW 5 | SW 5 | SW 6 | SW 6 | SW 6 | SW 14 | SW 14 | SW 5 | SW 13 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 |
Wave Graph | ||||||||||||||||||||
4 | 27 | 39 | 21 | 29 | 64 | 74 | 95 | 17 | 9 | 8 | 7 | 1 | 7 | 8 | 8 | 8 | 8 | 7 | 8 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | cross-on | on | on | cross-on | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | cross-off | cross-off | cross-off | cross-off | off |
High Tide | 1:21AM3.95m | 1:44PM3.51m | 2:05AM3.58m | 2:29PM3.25m | 2:56AM3.21m | 3:26PM3.00m | 4:05AM2.90m | 4:46PM2.83m | 5:38AM2.76m | 6:19PM2.84m | 7:04AM2.82m | 7:32PM3.02m | ||||||||
Low Tide | 7:45PM0.46m | 8:13AM0.53m | 8:25PM0.77m | 8:54AM0.92m | 9:10PM1.10m | 9:40AM1.27m | 10:08PM1.38m | 10:45AM1.54m | 11:34PM1.55m | 12:20PM1.61m | 1:12AM1.48m | 1:41PM1.46m | 2:17AM1.25m | |||||||
— | — | 6:01 | — | — | 6:03 | — | — | 6:05 | — | — | 6:07 | — | — | 6:09 | — | — | 6:11 | — | — | |
8:42 | — | — | 8:39 | — | — | 8:37 | — | — | 8:36 | — | — | 8:32 | — | — | 8:30 | — | — | 8:29 | — | |
mm | 1 | 3 | — | — | 2 | — | 1 | 5 | 2 | — | 1 | 2 | — | — | — | — | — | — | — | — |
Temp °C | 16 | 18 | 16 | 18 | 16 | 16 | 16 | 16 | 15 | 16 | 14 | 15 | 16 | 15 | 17 | 16 | 14 | 17 | 17 | 15 |
Feels °C | 15 | 17 | 12 | 15 | 12 | 11 | 11 | 14 | 10 | 11 | 11 | 13 | 12 | 12 | 13 | 11 | 11 | 14 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 5 | — | — | NW 4 | — | SW 16 | S 15 | SW 16 | SW 6 | SW 6 | SSW 6 | N 4 | NNW 4 | SW 13 | NNW 4 | SW 15 | SW 15 | SW 14 | SW 14 | NNW 4 |
4 | — | — | 8 | — | 10 | 5 | 10 | 17 | 9 | 3 | 9 | 3 | 7 | 3 | 8 | 8 | 8 | 7 | 1 | |
Swell 2 Height (m) Direction Period (s) | WNW 3 | — | — | — | — | — | — | — | SW 15 | SW 14 | SW 14 | SW 6 | — | — | SW 15 | — | S 12 | — | — | SW 14 |
1 | — | — | — | — | — | — | — | 8 | 8 | 8 | 1 | — | — | 8 | — | 3 | — | — | 8 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | SW 14 | SW 14 | SW 5 | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | 8 | 7 | 1 | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | SW 4 | W 4 | SW 6 | WSW 4 | WSW 5 | SW 5 | SW 6 | NNW 5 | N 5 | N 5 | — | NE 3 | NNE 3 | — | NNW 3 | NNW 3 | NNW 5 | NNW 4 | — |
— | 27 | 39 | 21 | 29 | 64 | 74 | 95 | 48 | 51 | 21 | — | 2 | 3 | — | 2 | 2 | 17 | 11 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 295 | 575 | 46 | 508 | 175 | 253 | 242 | 46 | 175 | 187 | 187 | 174 | 182 | 180 | 235 | 309 | 271 | 262 | 283 | 221 |
Best forecast wave conditions in Anglesy | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
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Information about the Rhosneigr Surf forecast
The above surf forecast table for Rhosneigr provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Rhosneigr can be found by selecting the local surf guide option on the grey menu. Our Rhosneigr 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 (Rhosneigr) 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 Rhosneigr 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.
Are you planning a holiday in Anglesy? If you are looking for accommodation near Rhosneigr, camping, hotels and holiday cottages in Anglesy, consider staying in Anglesey which is 2 km (1 miles) away. Other places in and around Anglesy where you can find information about places to rent, and car hire include Holyhead which is 12 km (7 miles) away, Bangor, Porthmadog and Llandudno.










