Surf Forecasts:
Port Isaac surf forecast from 17 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 1AM (local time) - 7ft (2.2m), 8s period, W swell with 659 kJ wave energy.
Best Forecast Surf Conditions for Port Isaac this week:
The most powerful waves expected at Port Isaac in the next 16 days are 2.2m 8s and forecast to arrive on Thursday (Aug 20) at 1AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Thu 20th Aug) | 7ft (2.2m) 8s |
Table - best surf conditions forecast for Port Isaac over the next 16 days.
The Lowdown
Alright folks, Rusty here, checkin’ in with the local outlook for Port Isaac. The forecast period is a long 16 days, but I gotta be straight with you – there’s a real flat stretch to start. We’re looking at a gap of over a week with no proper waves to get excited about, so don't rush to wax up just yet.
The first real chance of anything surfable doesn't pop up until Wednesday the 26th of August . The morning shows a little light – a 4ft swell rollin’ in from the west-northwest, with clean conditions thanks to a light cross-offshore breeze. The combined energy is moderate at 209. It’s not gonna set the world on fire, but it's the first sign of life. The water temp is sitting at 66°, which is much warmer than usual for this time of year – that’s nearly 4° above normal, so you can leave the thick rubber at home.
Thursday the 27th drops right back off into tiny, weak surf, and we’re back to nothing much on Friday the 28th, at least early. The afternoon of Friday the 28th sees a spike in energy. We’ve got a solid 6ft swell from the west with a 10-second period. The combined energy is pumping at 631. The problem? It’s not clean – a cross-shore wind is messin’ with the lines. The file calls it marginal, and I’d say that’s about right.
Sunday the 30th afternoon brings the biggest of the run: a 7ft west swell with an 8-second period and 626 units of energy. But for a break like Port Isaac, that’s getting into expert territory, and with the swell being a bit short-period and the winds light cross-shore, it’s gonna be a messy, lumpy affair. There’s no standout gem here – nothing that ticks all the boxes.
So, what’s the best on offer? Honestly, if I had to pick, I’d keep an eye on that Wednesday morning the 26th. It’s clean, the energy is there, and for a beginner-friendly break (which Port Isaac is), the 4ft is a nice manageable height. It’s about as good as it gets in this otherwise bleak window.
Keep your chin up, the forecasts can always flip.
Rusty
Short Range ForecastLight rain (total 5mm), mostly falling on Tue night. Warm (max 20°C on Mon morning, min 16°C on Mon night). Winds increasing (light winds from the NW on Mon morning, fresh winds from the W by Wed afternoon). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Thu night. Very mild (max 17°C on Thu morning, min 14°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
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) | WNW 6 | WNW 8 | W 7 | WNW 6 | W 6 | W 7 | W 7 | W 7 | W 8 | WNW 7 | WNW 7 | W 9 | W 8 | NNW 5 | W 9 | NNW 6 | W 10 | W 9 | W 9 | W 9 | W 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 45 | 104 | 79 | 147 | 94 | 240 | 225 | 324 | 659 | 222 | 158 | 125 | 47 | 31 | 24 | 58 | 33 | 27 | 14 | 14 | 14 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | on | cross-on | cross-on | on | on | cross-on | on | cross | cross-on | on | cross-on |
High Tide | 9:30PM6.61m | 9:48AM6.22m | 10:08PM6.08m | 10:27AM5.75m | 10:49PM5.52m | 11:11AM5.27m | 11:38PM5.00m | 12:09PM4.84m | 00:48AM4.62m | 1:32PM4.60m | 2:23AM4.52m | 3:05PM4.71m | 3:44AM4.77m | ||||||||
Low Tide | 3:22PM0.62m | 3:43AM0.85m | 3:58PM1.07m | 4:19AM1.34m | 4:37PM1.56m | 4:59AM1.84m | 5:24PM2.04m | 5:51AM2.29m | 6:30PM2.44m | 7:10AM2.59m | 8:06PM2.59m | 8:50AM2.57m | 9:36PM2.38m | ||||||||
 |  |  | | |  |  | | | | | | | |  | | | | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — | 6:15 | — | — | 6:16 | — | — | 6:18 | — | — |
 | — | 8:36 | — | — | 8:34 | — | — | 8:31 | — | — | 8:30 | — | — | 8:28 | — | — | 8:25 | — | — | 8:23 | — |
mm | — | — | — | — | — | 1 | 1 | 1 | 2 | — | — | 1 | 1 | — | — | — | — | — | — | — | — |
Temp °C | 20 | 18 | 19 | 19 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 15 | 17 | 16 | 14 | 17 | 17 | 16 | 17 | 17 | 16 |
Feels °C | 20 | 16 | 17 | 17 | 14 | 14 | 12 | 12 | 13 | 14 | 14 | 11 | 15 | 11 | 10 | 12 | 12 | 12 | 14 | 11 | 12 |
Swell 1 Height (m) Direction Period (s) | WNW 6 | WNW 8 | — | W 17 | W 17 | W 17 | W 16 | — | W 16 | WNW 7 | W 9 | W 9 | W 8 | W 8 | NNW 4 | NNW 6 | W 10 | W 9 | W 9 | W 9 | WNW 4 |
| kJ | 45 | 104 | — | 6 | 6 | 6 | 5 | — | 5 | 222 | 103 | 125 | 47 | 31 | 13 | 58 | 30 | 27 | 14 | 14 | 4 |
Swell 2 Height (m) Direction Period (s) | WNW 9 | W 18 | — | — | — | — | — | — | — | W 9 | SW 14 | W 14 | W 16 | W 16 | W 9 | W 10 | W 15 | SW 15 | WNW 4 | W 5 | W 9 |
| kJ | 16 | 6 | — | — | — | — | — | — | — | 108 | 8 | 4 | 5 | 5 | 24 | 31 | 4 | 8 | 1 | 2 | 14 |
Swell 3 Height (m) Direction Period (s) | W 18 | — | — | — | — | — | — | — | — | W 15 | — | — | W 13 | W 13 | W 11 | SW 15 | — | W 5 | SW 14 | SW 14 | NNW 4 |
| kJ | 6 | — | — | — | — | — | — | — | — | 4 | — | — | 3 | 3 | 10 | 9 | — | 1 | 8 | 8 | 1 |
Wind waves Height (m) Direction Period (s) | — | — | W 7 | WNW 6 | W 6 | W 7 | W 7 | W 7 | W 8 | — | WNW 7 | NNW 5 | NNW 5 | NNW 5 | — | — | NNW 5 | NNW 4 | N 3 | NW 4 | — |
| kJ | — | — | 79 | 147 | 94 | 240 | 225 | 324 | 659 | — | 158 | 37 | 17 | 26 | — | — | 33 | 10 | 1 | 9 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 410 | 497 | 250 | 249 | 809 | 291 | 310 | 258 | 113 | 113 | 69 | 33 | 3 | 250 | 249 | 201 | 280 | 6 | 37 | 397 | 288 |
Best forecast wave conditions in North Cornwall | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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Information about the Port Isaac Surf forecast
The above surf forecast table for Port Isaac provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Port Isaac can be found by selecting the local surf guide option on the grey menu. Our Port Isaac 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 (Port Isaac) 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 Port Isaac 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 North Cornwall? If you are looking for accommodation near Port Isaac, camping, hotels and holiday cottages in North Cornwall, consider staying in Padstow which is 8 km (5 miles) away. Other places in and around North Cornwall where you can find information about places to rent, and car hire include Bodmin which is 15 km (9 miles) away, Newquay, Par and Saint Austell.
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