Surf Forecasts:
Kennack Sands surf forecast from 17 Aug 2026:
- Most powerful swell: Tuesday 18 Aug, 10PM (local time) - 0.5ft (0.2m), 17s period, SSW swell with 29 kJ wave energy.
Best Forecast Surf Conditions for Kennack Sands this week:
The most powerful waves expected at Kennack Sands in the next 16 days are 0.2m 17s and forecast to arrive on Tuesday (Aug 18) at 10PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.4m 9s period and expected on Thursday (Aug 20) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Tue 18th Aug) | 0.5ft (0.2m) 17s |
Table - best surf conditions forecast for Kennack Sands over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the cards for our local stretch.
Right off the bat, I’ve got to be straight with you – this outlook is a tough one. We’re looking at a long, quiet spell with hardly a wave worth paddling for. The water temperature is sitting at 67°, which is a touch warmer than normal for this time of year, so at least the wait will be comfortable.
The only spot on the radar is Kennack Sands. It’s a sheltered, beginner-friendly break, but it’s also inconsistent. For the first nine days, from Monday the 17th of August right through to the 25th, it’s a complete write-off. We’re talking tiny, weak surf with combined energy values barely reaching 27 (weak energy), and the swell is just a whisper of 0.7 ft. The wind is mostly cross-off or offshore, keeping the surface clean, but there’s simply no power in the water to do anything with. It’s a frustrating blank run.
We hit a bit of a change on Wednesday the 26th of August. The afternoon sees a pulse of 4 ft swell from the south, with a short period of 6 seconds. The combined energy jumps to 104 (moderate), but it’s still a messy, short-period windswell, and the comment says “poor surf conditions.” The wind is a cross-off, so it’s not a total loss, but it’s nothing to get excited about. After that, we’re back to flat, glassy mornings and clean afternoons, but still no rideable swell. The offshore winds that pop up on the 29th and 30th of August are a tease – they’d be perfect if there was any swell.
In the end, there’s no standout day here. The forecasts can always change, but for now, the surf is just not on. It’s a good time to give the board a rest and enjoy the beach.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed night. Warm (max 20°C on Mon morning, min 16°C on Wed night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Fri afternoon. Very mild (max 18°C on Thu morning, min 14°C on Fri 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) | S 18 | S 18 | S 19 | SSW 17 | W 6 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | E 6 | ENE 5 | E 6 | SSW 15 | SSW 14 | SSW 14 | SSW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 6 | 7 | 27 | 0 | 29 | 24 | 24 | 22 | 21 | 20 | 18 | 17 | 17 | 5 | 11 | 13 | 21 | 19 | 19 | 20 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-off | cross-off |
High Tide | 8:45PM4.58m | 9:06AM4.28m | 9:25PM4.22m | 9:47AM3.98m | 10:10PM3.84m | 10:36AM3.66m | 11:06PM3.49m | 11:42AM3.40m | 00:25AM3.26m | 1:09PM3.29m | 1:52AM3.23m | 2:28PM3.38m | 3:01AM3.38m | ||||||||
Low Tide | 3:06PM0.34m | 3:28AM0.47m | 3:44PM0.66m | 4:05AM0.83m | 4:23PM1.01m | 4:44AM1.18m | 5:07PM1.34m | 5:31AM1.50m | 6:05PM1.62m | 6:38AM1.72m | 7:29PM1.75m | 8:12AM1.74m | 9:05PM1.64m | ||||||||
 |  |  | | | | | |  | | |  |  | | | | | | | | | |
 | 6:11 | — | — | 6:13 | — | — | 6:15 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — |
 | — | 8:36 | — | — | 8:34 | — | — | 8:31 | — | — | 8:30 | — | — | 8:28 | — | — | 8:25 | — | — | 8:23 | — |
mm | — | — | — | — | — | — | — | — | 2 | — | — | — | 1 | 2 | — | — | — | — | — | — | — |
Temp °C | 20 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 17 | 18 | 18 | 15 | 17 | 18 | 14 | 17 | 18 | 17 | 18 | 19 | 17 |
Feels °C | 19 | 16 | 17 | 16 | 13 | 14 | 13 | 12 | 12 | 14 | 13 | 12 | 15 | 13 | 10 | 14 | 15 | 13 | 16 | 16 | 12 |
Swell 1 Height (m) Direction Period (s) | W 9 | S 18 | S 16 | W 8 | SW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | W 9 | W 9 | WNW 9 | WNW 8 | W 7 | W 9 | NNW 6 | NNW 6 | WSW 9 | WSW 9 | W 9 | NW 4 |
| kJ | 40 | 6 | 5 | 4 | 11 | 29 | 24 | 24 | 22 | 664 | 565 | 289 | 90 | 39 | 24 | 36 | 21 | 28 | 26 | 26 | 5 |
Swell 2 Height (m) Direction Period (s) | S 18 | — | S 19 | SSW 17 | — | — | — | — | — | SSW 14 | SSW 14 | SSW 14 | WSW 9 | WSW 9 | E 6 | W 10 | W 10 | E 6 | SSW 14 | SSW 14 | W 9 |
| kJ | 6 | — | 7 | 27 | — | — | — | — | — | 21 | 20 | 18 | 25 | 25 | 5 | 49 | 47 | 9 | 19 | 19 | 14 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SSW 13 | SSW 13 | WNW 7 | E 6 | E 6 | SSW 15 | WNW 4 | — | SSW 14 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 17 | 17 | 11 | 5 | 13 | 21 | 1 | — | 20 |
Wind waves Height (m) Direction Period (s) | WNW 6 | W 8 | W 7 | W 6 | W 6 | W 7 | W 8 | W 8 | W 9 | — | — | N 6 | N 6 | NNW 6 | NNW 5 | ENE 5 | — | NNW 5 | N 4 | NW 5 | NW 4 |
| kJ | 50 | 145 | 92 | 119 | 130 | 218 | 308 | 463 | 848 | — | — | 15 | 5 | 19 | 12 | 11 | — | 9 | 1 | 11 | 10 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 427 | 543 | 187 | 250 | 863 | 230 | 249 | 195 | 180 | 180 | 21 | 21 | 8 | 187 | 186 | 186 | 250 | 19 | 19 | 413 | 303 |
Best forecast wave conditions in South Cornwall | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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Information about the Kennack Sands Surf forecast
The above surf forecast table for Kennack Sands provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kennack Sands can be found by selecting the local surf guide option on the grey menu. Our Kennack Sands 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 (Kennack Sands) 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 Kennack Sands 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.
Kennack Sands is 9 km (6 miles) from The Lizard. If you plan a holiday in South Cornwall, look for hotels and other accommodation in The Lizard. The Lizard has rooms for a wide range of budgets as well as car hire and transport links.
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