Surf Forecasts:
Fishermans (Rhiw) surf forecast from 12 Sep 2026:
- Most powerful swell: Saturday 12 Sep, 1PM (local time) - 7.5ft (2.3m), 7s period, SW swell with 529 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 2.3m 7s and forecast to arrive on Saturday (Sep 12) at 1PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Wednesday (Sep 16) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Sat 12th Sep) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Fishermans (Rhiw) over the next 16 days.
The Lowdown
Alright, ol’ mate Rusty here, lookin’ at what we’ve got for the next couple of weeks. Bit of a grim picture, to be honest. The whole window is a real struggle, with nothing that you’d call a proper surf day. We’re stuck with a long, dry spell of poor to useless conditions for the foreseeable future.
We start off on Saturday, the 12th of September, and straight away it’s a write-off. Fishermans (Rhiw) is copping a strong onshore blow from the SW at 28 mph, with a lumpy, raw 7 ft swell but a short, horrible period of 7 seconds. The water’s a touch warmer than normal for this time of year at 63°, but you wouldn’t want to be out there. The combined energy is moderate at best (374), but with that wind, it’s just a washing machine. No good for anyone.
Sunday the 13th gives us a tease – a light offshore breeze from the NNE at 6 mph, and the ocean turns clean. Trouble is, the swell has dropped off a cliff to just 2 ft and 6 seconds, with barely any energy (35). It’s tiny, weak, and not worth paddling out for.
From Monday the 14th through to Friday the 18th of September, it’s all onshore and cross-shore winds, with lumpy, messy surf. Swell heights bob around 1.0 ft to 5 ft, but periods are consistently short – 4 to 7 seconds – and the wind always has some nasty cross or onshore component. The wave energy never gets strong; it’s all moderate to weak (10 to 119). Just frustrated conditions.
Saturday the 19th is more of the same: a fresh onshore breeze (22 mph) and a 5 ft swell, but it’s unrideable.
There’s a bit of a spike on Sunday the 20th of September, with a 7 ft to 8 ft SW swell and a period creeping up to 8 seconds. The energy jumps right up (361 to 861 – that’s strong), but it’s being hammered by a near gale wind from the SW at 31 mph. That’s a full-blown stormy mess, only for the mad dogs and for kite surfers, not for a paddle surfer.
From Monday the 21st through to the end of the forecast on Sunday the 27th, it fades away to almost nothing. A few morning windows get clean offshore breezes (NNE, 3 to 12 mph), but the swell is pathetic – 0.3 ft to 2 ft, with periods all over the shop, including a weird 14-second groundswell on the 26th that’s basically flat. Wave energy is tiny (1 to 54). Just no power.
So, the bottom line: there are no standout days, no hidden gems, no reason to get excited. The entire 16-day outlook is a bust for decent surf. When it’s not blown out, it’s flat. A classic autumn slump for this spot. Keep the board in the car for a better window, but don’t hold your breath.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Sat morning. Very mild (max 18°C on Mon morning, min 16°C on Sat morning). Winds decreasing (strong winds from the SW on Sat morning, calm by Sun morning). | Days 4-6 Weather SummaryMostly dry. Very mild (max 16°C on Tue afternoon, min 13°C on Tue night). Winds increasing (light winds from the W on Tue afternoon, strong winds from the WSW by Wed night). | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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 7 | SW 7 | WSW 7 | SW 6 | SW 6 | SW 6 | SW 5 | SW 5 | SW 6 | SW 6 | SW 6 | SW 6 | SW 6 | WSW 7 | WSW 4 | W 6 | W 5 | W 5 | WSW 4 | SW 5 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 374 | 440 | 153 | 34 | 20 | 10 | 69 | 93 | 146 | 85 | 38 | 10 | 8 | 10 | 34 | 119 | 60 | 50 | 36 | 51 | 129 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | off | cross-on | on | on | on | on | cross | cross | cross-off | cross-off | cross | cross-on | cross | cross | cross | cross-on | cross-on | on |
High Tide | 9:55PM4.48m | 10:15AM4.11m | 10:32PM4.37m | 10:51AM4.02m | 11:09PM4.13m | 11:26AM3.85m | 11:45PM3.81m | 12:01PM3.59m | 00:22AM3.44m | 12:37PM3.29m | 1:02AM3.07m | 1:20PM2.97m | 1:52AM2.71m | ||||||||
Low Tide | 4:29PM0.06m | 4:55AM-0.05m | 5:03PM0.13m | 5:27AM0.15m | 5:36PM0.29m | 5:57AM0.42m | 6:07PM0.51m | 6:26AM0.72m | 6:39PM0.77m | 6:56AM1.02m | 7:16PM1.06m | 7:33AM1.31m | 8:07PM1.34m | ||||||||
 |  |  | | | |  | |  | |  | | | | | | | | | | | |
 | 6:46 | — | — | 6:48 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:56 | — | — |
 | — | 7:42 | — | — | 7:39 | — | — | 7:37 | — | — | 7:35 | — | — | 7:31 | — | — | 7:30 | — | — | 7:27 | — |
mm | 9 | — | — | — | — | — | — | — | 6 | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 16 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 17 | 15 | 16 | 15 | 13 | 16 | 15 | 14 | 16 | 15 | 14 | 15 | 16 |
Feels °C | 9 | 12 | 15 | 17 | 17 | 15 | 16 | 14 | 12 | 11 | 13 | 8 | 7 | 11 | 9 | 7 | 11 | 8 | 9 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 7 | SW 6 | SW 6 | SW 6 | W 12 | — | W 12 | SW 6 | SW 6 | SW 6 | SW 6 | SW 5 | NNW 5 | — | — | W 13 | NW 4 | — | — |
| kJ | — | — | 132 | 34 | 20 | 10 | 3 | — | 3 | 85 | 38 | 10 | 8 | 7 | 2 | — | — | 3 | 5 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | NW 4 | — | — | — | — | — | — | — | — | SW 8 | WSW 7 | NW 4 | — | — | — | — | — | — |
| kJ | — | — | — | 1 | — | — | — | — | — | — | — | — | 2 | 10 | 1 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 7 | SW 7 | WSW 7 | — | — | SW 3 | SW 5 | SW 5 | SW 6 | NW 4 | NW 5 | NW 5 | NW 6 | NW 5 | WSW 4 | W 6 | W 5 | W 5 | WSW 4 | SW 5 | SW 6 |
| kJ | 374 | 440 | 153 | — | — | 2 | 69 | 93 | 146 | 20 | 25 | 84 | 96 | 30 | 34 | 119 | 60 | 50 | 36 | 51 | 129 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 297 | 346 | 41 | 129 | 137 | 240 | 255 | 255 | 232 | 129 | 142 | 142 | 142 | 285 | 309 | 320 | 498 | 322 | 255 | 297 | 255 |
Best forecast wave conditions in Lleyn Peninsula | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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‘Porth Neigwl: Choppy waves hadn't tidied much (from what I could see in the dark.’
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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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