Surf Forecasts:
St Agnes surf forecast from 15 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 1AM (local time) - 7.5ft (2.3m), 8s period, WNW swell with 686 kJ wave energy.
Best Forecast Surf Conditions for St Agnes this week:
The most powerful waves expected at St Agnes in the next 16 days are 2.3m 8s and forecast to arrive on Thursday (Aug 20) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 5s period and expected on Friday (Aug 21) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Thu 20th Aug) | 7.5ft (2.3m) 8s |
Table - best surf conditions forecast for St Agnes over the next 16 days.
The Lowdown
Alright, mate, Rusty here. Let’s have a look at what’s on the menu for St Agnes over the next couple of weeks.
To be straight with you, this forecast is a bit of a tough one. The water’s sitting at about 66°, which is a touch warmer than usual for this time of year, so that’s a nice little bonus if you’re in the water. The first week and a half is pretty much all poor conditions, with a lot of onshore and cross-onshore wind messing up the shape. The swell energy is weak to moderate, with values from 36 (weak) up to 374 (moderate), but the wind is just never your friend. It’s a long stretch of chop and lumpy sea, so you’re not missing much if you leave the board at home.
There’s a glimmer of hope on Monday the 24th of August. The morning sees a clean, cross-offshore breeze from the SSW at just 3 mph, with a tiny 1 ft swell from the SW. The period is a very long 14 seconds, which is proper groundswell, but at that size it’s barely a ripple. The energy is a weak 38. Honestly, it’s clean but too small to get excited about. The afternoon stays clean with a cross-offshore wind, but the swell drops to 0.7 ft.
The real standout, and the only one that gets my attention, is Wednesday the 26th of August. This is the best on offer. You’ve got a clean, cross-offshore wind from the SW at 9 mph in the morning, and the swell is a solid 4 ft from the WNW with a period of 11 seconds. That’s a decent groundswell, and the energy is moderate at 455. The break is fairly consistent, but it’s a fairly exposed spot, so it’ll handle the size. The direction is close to the optimum WSW, so it’s got a good line. The wind will keep it clean, and the sets should have some push. It’s a solid intermediate option. The afternoon stays clean with a cross-offshore breeze, though the wind picks up a bit, and the swell holds at 4 ft from the W.
After that, Thursday the 27th is clean but the wind gets strong, and the swell drops. The swell on Saturday the 29th of August has a massive energy of 1415, with a 8 ft swell from the SSW, but it’s 8-second period and cross-on wind, so it’s a messy, lumpy beast. Too big for beginners and not clean enough for experts.
So, in short, the first ten days are a write-off. The best chance for a decent wave is Wednesday the 26th of August. Get on it.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Fri afternoon, min 16°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Tue night. Warm (max 20°C on Tue morning, min 16°C on Tue night). Winds increasing (light winds from the WSW on Tue afternoon, fresh winds from the WNW by Wed afternoon). | |||||||||||||||||||
Fri 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||
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) | W 9 | W 8 | W 8 | W 8 | W 8 | WNW 7 | W 7 | W 7 | W 9 | WNW 8 | W 7 | W 6 | W 6 | W 6 | WNW 6 | WNW 7 | WNW 8 | WNW 7 | WNW 9 | WNW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 123 | 165 | 102 | 95 | 54 | 18 | 16 | 12 | 39 | 96 | 69 | 69 | 66 | 139 | 160 | 326 | 686 | 249 | 106 | 120 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | on | cross-on | cross-on | cross-on | on | on | on |
High Tide | 7:13PM6.86m | 7:34AM6.51m | 7:53PM6.76m | 8:13AM6.37m | 8:31PM6.49m | 8:51AM6.09m | 9:09PM6.08m | 9:28AM5.72m | 9:48PM5.59m | 10:08AM5.28m | 10:29PM5.07m | 10:52AM4.83m | 11:20PM4.59m | |||||||
Low Tide | 1:40AM-0.08m | 1:54PM0.05m | 2:18AM0.07m | 2:31PM0.25m | 2:54AM0.38m | 3:07PM0.57m | 3:29AM0.78m | 3:44PM0.99m | 4:05AM1.23m | 4:23PM1.44m | 4:45AM1.69m | 5:10PM1.88m | ||||||||
 |  |  | |  | | | | | | | |  |  | | |  | | | | |
 | — | — | 6:07 | — | — | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:16 | — | — |
 | 8:43 | — | — | 8:40 | — | — | 8:38 | — | — | 8:37 | — | — | 8:35 | — | — | 8:32 | — | — | 8:30 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 8 | — | — | 1 | — | — | — |
Temp °C | 21 | 18 | 18 | 18 | 16 | 19 | 19 | 18 | 19 | 19 | 19 | 20 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 |
Feels °C | 21 | 18 | 14 | 14 | 12 | 17 | 17 | 17 | 17 | 17 | 19 | 19 | 18 | 19 | 13 | 12 | 11 | 12 | 12 | 14 |
Swell 1 Height (m) Direction Period (s) | W 9 | W 8 | W 8 | W 8 | W 8 | WNW 7 | W 7 | W 7 | W 9 | SW 18 | W 8 | W 8 | W 6 | SSW 17 | WNW 11 | SSW 16 | SW 15 | WNW 7 | WNW 7 | WNW 8 |
| kJ | 123 | 165 | 102 | 95 | 54 | 18 | 16 | 8 | 39 | 12 | 12 | 11 | 66 | 29 | 88 | 24 | 36 | 249 | 73 | 120 |
Swell 2 Height (m) Direction Period (s) | S 13 | SW 13 | — | — | SW 12 | NNE 4 | N 4 | SW 18 | SW 18 | — | SW 16 | SSW 17 | SW 17 | — | SSW 16 | SSW 16 | — | WNW 9 | WNW 9 | W 10 |
| kJ | 3 | 7 | — | — | 6 | 6 | 1 | 12 | 12 | — | 10 | 28 | 11 | — | 24 | 24 | — | 113 | 106 | 29 |
Swell 3 Height (m) Direction Period (s) | S 11 | S 10 | — | — | S 20 | WSW 7 | SW 18 | — | — | — | S 19 | — | W 8 | — | — | — | — | SSW 14 | SW 14 | SSW 14 |
| kJ | 2 | 2 | — | — | 7 | 11 | 13 | — | — | — | 7 | — | 1 | — | — | — | — | 21 | 54 | 19 |
Wind waves Height (m) Direction Period (s) | WNW 2 | NNE 3 | N 5 | N 5 | N 5 | N 4 | WNW 5 | WNW 4 | WNW 5 | WNW 8 | W 7 | W 6 | W 6 | W 6 | WNW 6 | WNW 7 | WNW 8 | — | N 5 | N 5 |
| kJ | 1 | 2 | 44 | 20 | 34 | 10 | 7 | 8 | 31 | 96 | 69 | 69 | 43 | 139 | 160 | 326 | 686 | — | 35 | 16 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 15 | 28 | 406 | 241 | 44 | 27 | 261 | 243 | 400 | 213 | 285 | 279 | 21 | 223 | 751 | 222 | 290 | 103 | 153 | 27 |
Best forecast wave conditions in North Cornwall | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
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Information about the St Agnes Surf forecast
The above surf forecast table for St Agnes provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at St Agnes can be found by selecting the local surf guide option on the grey menu. Our St Agnes 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 (St Agnes) 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 St Agnes 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.
St Agnes is 13 km (8 miles) from Camborne. If you plan a holiday in North Cornwall, look for hotels and other accommodation in Camborne. Camborne has rooms for a wide range of budgets as well as car hire and transport links.
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