Surf Forecasts:
Fishermans (Rhiw) surf forecast from 17 Aug 2026:
- Most powerful swell: Wednesday 19 Aug, 7PM (local time) - 5.5ft (1.7m), 6s period, SW swell with 223 kJ wave energy.
Best Forecast Surf Conditions for Fishermans (Rhiw) this week:
The most powerful waves expected at Fishermans (Rhiw) in the next 16 days are 1.7m 6s and forecast to arrive on Wednesday (Aug 19) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Thursday (Aug 20) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Wed 19th Aug) | 5.5ft (1.7m) 6s |
Table - best surf conditions forecast for Fishermans (Rhiw) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be honest, it’s a grim picture out there for the next couple of weeks, and I’m not going to sugarcoat it. This is one of those stretches where you’re better off sorting out your quiver or making friends with the kettle, because the surf is going to be tiny, messy, or just plain absent for the vast majority of the window.
The first real glimmer of hope doesn't show its face until the very end of the month, at Fishermans (Rhiw). Up until then, we are looking at a whole lot of nothing. From the 17th right through to the morning of the 30th, it's a barren wasteland. There are a few pulses of swell on the 19th and again on the 26th, but they’re all tangled up with shithouse winds from the southwest, making everything a lumpy, cross-onshore mess. The energy is all over the place, but it's just not translating into anything ridable.
The one standout is the morning of Sunday, the 30th of August. That’s your window. The forecast shows the swell kicking up to a solid 6ft from the SW, and here’s the kicker – for the first time in ages, we get a proper offshore wind from the NNE. It’s not just a puff, either, a solid 12 mph breeze is going to be grooming that reef into something clean and lined up. The energy is moderate at 293, and the period is a short but workable 6 seconds. It’s not going to be a classic, but after two weeks of flatness, it’s going to feel like a gift. This is the morning to clear your schedule for.
The following afternoon also looks okay, with a similar 7ft swell and continued offshore winds at 16 mph, but the morning is the pick of the two. The water temp is about average for this time of year, so a good summer wetsuit should do the trick.
After that, it all falls apart again on the 31st as the wind swings onshore, leaving us high and dry. So mark your calendars for the 30th, it’s your only real shot.
-Rusty
Short Range ForecastLight rain (total 7mm), mostly falling on Mon night. Very mild (max 18°C on Mon night, min 15°C on Tue night). Winds increasing (light winds from the WSW on Mon afternoon, fresh winds from the SW by Wed afternoon). | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Wed night. Very mild (max 16°C on Wed night, min 13°C on Thu night). Winds decreasing (fresh winds from the N on Thu morning, light winds from the NNE by Sat morning). | ||||||||||||||||||||
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) | WSW 5 | SW 5 | SW 5 | WSW 6 | WSW 6 | WSW 4 | WSW 5 | SW 6 | WSW 7 | SW 6 | SW 6 | SW 6 | NW 4 | W 16 | W 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 15 | 7 | 33 | 46 | 23 | 24 | 111 | 177 | 175 | 42 | 20 | 8 | 12 | 7 | 7 | 9 | 9 | 8 | 8 | 7 | 8 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | cross | cross-on | cross | cross-on | on | cross-on | cross-off | cross-off | off | cross-off | cross-off | off | off | cross-off | off | cross-off | cross | glassy |
High Tide | 12:01PM3.72m | 00:20AM3.91m | 12:40PM3.48m | 1:01AM3.53m | 1:22PM3.21m | 1:46AM3.14m | 2:11PM2.93m | 2:45AM2.80m | 3:22PM2.70m | 4:14AM2.59m | 5:01PM2.65m | 5:49AM2.62m | 6:22PM2.82m | ||||||||
Low Tide | 6:39AM0.30m | 6:44PM0.52m | 7:13AM0.62m | 7:20PM0.79m | 7:48AM0.95m | 7:59PM1.07m | 8:27AM1.25m | 8:50PM1.34m | 9:23AM1.49m | 10:11PM1.52m | 10:58AM1.60m | 00:02AM1.51m | 12:37PM1.49m | 1:19AM1.30m | |||||||
 |  |  | | | | |  | |  |  |  | | |  | | | | | | | |
 | 6:01 | — | — | 6:03 | — | — | 6:05 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — |
 | — | 8:40 | — | — | 8:38 | — | — | 8:37 | — | — | 8:35 | — | — | 8:32 | — | — | 8:30 | — | — | 8:28 | — |
mm | — | — | 3 | — | — | 1 | — | 2 | 3 | 1 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 17 | 18 | 16 | 17 | 18 | 16 | 17 | 16 | 16 | 16 | 15 | 14 | 15 | 14 | 15 | 15 | 15 | 14 | 16 | 16 |
Feels °C | 15 | 14 | 16 | 13 | 13 | 13 | 9 | 12 | 12 | 10 | 10 | 11 | 11 | 11 | 8 | 10 | 9 | 11 | 11 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 5 | SW 5 | — | WSW 6 | NW 4 | W 17 | — | — | — | SW 6 | SW 6 | SW 6 | NW 4 | SW 6 | SW 13 | SW 15 | SW 15 | SW 15 | SW 14 | NW 4 | — |
| kJ | 15 | 7 | — | 46 | 6 | 6 | — | — | — | 42 | 20 | 5 | 12 | 1 | 7 | 9 | 9 | 8 | 8 | 2 | — |
Swell 2 Height (m) Direction Period (s) | — | NW 3 | — | W 16 | W 17 | — | — | — | — | W 15 | SW 14 | SW 14 | WSW 6 | SW 13 | W 16 | W 8 | SW 12 | W 12 | W 9 | SW 14 | — |
| kJ | — | 2 | — | 5 | 5 | — | — | — | — | 4 | 8 | 8 | 3 | 7 | 5 | 1 | 6 | 3 | 2 | 7 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | W 9 | SW 13 | W 16 | W 5 | W 11 | — | W 12 | W 9 | — | SW 14 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 2 | 7 | 5 | 1 | 2 | — | 3 | 2 | — | 8 |
Wind waves Height (m) Direction Period (s) | — | — | SW 5 | NW 4 | WSW 6 | WSW 4 | WSW 5 | SW 6 | WSW 7 | NW 5 | NNW 5 | NNW 5 | — | NNW 4 | N 4 | NNW 5 | NW 4 | NNW 3 | NNW 4 | — | — |
| kJ | — | — | 33 | 5 | 23 | 24 | 111 | 177 | 175 | 49 | 59 | 25 | — | 10 | 10 | 12 | 16 | 4 | 2 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 298 | 329 | 554 | 7 | 464 | 297 | 292 | 292 | 139 | 129 | 296 | 129 | 129 | 303 | 268 | 216 | 184 | 184 | 303 | 308 | 114 |
Best forecast wave conditions in Lleyn Peninsula | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Information about the Fishermans (Rhiw) Surf forecast
The above surf forecast table for Fishermans (Rhiw) provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Fishermans (Rhiw) can be found by selecting the local surf guide option on the grey menu. Our Fishermans (Rhiw) 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 (Fishermans (Rhiw)) 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 Fishermans (Rhiw) 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 Lleyn Peninsula? If you are looking for accommodation near Fishermans (Rhiw), camping, hotels and holiday cottages in Lleyn Peninsula, consider staying in Porthmadog which is 34 km (21 miles) away. Other places in and around Lleyn Peninsula where you can find information about places to rent, and car hire include Anglesey which is 48 km (30 miles) away, Holyhead, Aberystwyth and Bangor.
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