Surf Forecasts:
Fishermans (Rhiw) surf forecast from 18 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 4AM (local time) - 3.5ft (1.1m), 6s period, WSW swell with 90 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 1.1m 6s and forecast to arrive on Thursday (Aug 20) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Thursday (Aug 20) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Thu 20th Aug) | 3.5ft (1.1m) 6s |
Table - best surf conditions forecast for Fishermans (Rhiw) over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s cookin’ for Fishermans (Rhiw) over the next couple of weeks.
Honestly, I’m looking at a pretty bleak picture overall. The 16-day window opens now, but there’s a long dry spell right up until the end of August. For over a week, the swell is tiny—dropping to 0.3 ft with long periods from the SW—but there’s just no push. The combined energy is barely there, with numbers like 15 or 10 (weak energy). It’s clean at times, with some glassy conditions on Monday the 24th morning, but you’d be bobbing around on next to nothing. That stretch from Tuesday the 18th right through to Monday the 31st is basically a write-off for any proper surfing. There are a few moments of offshore or cross-off wind, especially on Saturday the 22nd with a light offshore, but again, the swell is flat. It’s heartbreaking because the conditions look tidy, but the ocean just isn’t delivering.
Now, if you can wait, there’s a glimmer. The stand-out here, and I mean the only real option, comes on Tuesday the 1st of September morning. That’s a long way off, so take it with a pinch of salt, but the numbers are interesting. The swell bumps up to 8 ft from the WSW. That’s a big jump. Combined wave energy hits 742 (strong energy). The period is only 8 seconds, so it’s windswell, not a proper groundswell, but it’s got some grunt. The wind is cross-off from the NNW at 28 mph, which will clean it up, but that’s a fresh breeze. Still, the shape should be rideable. Just be aware, that 8 ft is pushing into expert territory—this isn’t one for the beginners. On Tuesday afternoon, it drops to 6 ft, still with clean cross-off wind, but the energy backs off to 256 (moderate energy).
The water at the start of the outlook was 65° with a 4° anomaly, so much warmer than normal for this time of year—that’s a pleasant surprise.
All in all, the first week and a half is a total flat spell. The only real shot is that Tuesday the 1st of September morning window. If it comes together, it’ll be the pick of the bunch, but for everything else, you’re better off leaving the board at home.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Tue night. Very mild (max 18°C on Tue afternoon, min 13°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Fri morning. Very mild (max 16°C on Sun night, min 13°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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) | SW 6 | SW 6 | WSW 5 | W 4 | SW 4 | WSW 6 | SW 6 | SW 6 | SW 6 | NW 5 | W 16 | W 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 58 | 29 | 30 | 16 | 19 | 70 | 43 | 19 | 9 | 19 | 7 | 7 | 9 | 9 | 8 | 8 | 7 | 8 | 8 | 7 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | off | off | cross-off | off | glassy | cross-on | cross-on |
High Tide | 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 | 6:54AM2.80m | 7:16PM3.08m | ||||||||
Low Tide | 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 | 1:36PM1.24m | 2:08AM1.03m | ||||||||
 |  |  |  | | |  | | |  | |  | | | | | |  | | | | |
 | 6:03 | — | — | 6:05 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — |
 | — | 8:38 | — | — | 8:37 | — | — | 8:35 | — | — | 8:32 | — | — | 8:30 | — | — | 8:28 | — | — | 8:25 | — |
mm | — | — | 4 | 2 | 1 | 4 | — | — | 2 | 2 | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 18 | 15 | 15 | 17 | 17 | 15 | 16 | 15 | 13 | 15 | 14 | 14 | 14 | 14 | 14 | 15 | 16 | 15 | 16 | 16 |
Feels °C | 15 | 16 | 11 | 11 | 11 | 14 | 10 | 10 | 11 | 10 | 11 | 9 | 10 | 10 | 10 | 12 | 12 | 13 | 15 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 6 | NW 4 | W 17 | SW 5 | NW 4 | SW 16 | SW 6 | SW 6 | SW 6 | NW 5 | WSW 6 | SW 13 | NNW 4 | SW 15 | SW 15 | SW 14 | SW 14 | NNW 3 | SW 14 | SW 14 | WSW 3 |
| kJ | 58 | 7 | 6 | 7 | 2 | 10 | 43 | 19 | 9 | 19 | 3 | 7 | 8 | 9 | 8 | 8 | 7 | 2 | 8 | 7 | 1 |
Swell 2 Height (m) Direction Period (s) | W 16 | W 17 | — | W 16 | W 15 | — | SW 15 | SW 14 | SW 14 | WSW 6 | SW 13 | SW 6 | SW 15 | W 12 | W 12 | W 9 | W 9 | SW 14 | — | SW 4 | SW 13 |
| kJ | 5 | 5 | — | 5 | 5 | — | 8 | 8 | 8 | 3 | 7 | 1 | 9 | 3 | 3 | 2 | 2 | 8 | — | 1 | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | W 14 | SW 13 | W 16 | W 16 | W 10 | W 10 | W 12 | — | — | — | W 9 | — | W 8 |
| kJ | — | — | — | — | — | — | — | — | 4 | 7 | 5 | 5 | 2 | 2 | 3 | — | — | — | 1 | — | 1 |
Wind waves Height (m) Direction Period (s) | NW 4 | SW 6 | WSW 5 | W 4 | SW 4 | WSW 6 | NW 4 | NNW 5 | NNW 4 | — | NW 5 | N 4 | — | NW 4 | NNW 3 | NNW 5 | NNW 4 | — | — | — | — |
| kJ | 5 | 29 | 30 | 16 | 19 | 70 | 26 | 42 | 15 | — | 22 | 12 | — | 4 | 4 | 12 | 10 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 7 | 366 | 130 | 292 | 292 | 66 | 129 | 129 | 129 | 129 | 303 | 137 | 190 | 273 | 303 | 134 | 313 | 216 | 305 | 292 | 295 |
Best forecast wave conditions in Lleyn Peninsula | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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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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