Surf Forecasts:
St Agnes surf forecast from 13 Aug 2026:
- Most powerful swell: Thursday 13 Aug, 1PM (local time) - 4ft (1.2m), 10s period, W swell with 290 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 1.2m 10s and forecast to arrive on Thursday (Aug 13) 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 0.4m 4s period and expected on Monday (Aug 17) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Thu 13th Aug) | 4ft (1.2m) 10s |
Table - best surf conditions forecast for St Agnes over the next 16 days.
The Lowdown
Alright, mate, Rusty here. Let’s be straight with you—this 16-day stretch for St Agnes is a tough one. We’ve got a long, frustrating gap of poor conditions ahead, so don’t be in a rush to wax up just yet. The first few days are a write-off, and it stays that way for a while.
The trouble starts immediately. Thursday the 13th and Friday the 14th are just messy—small, weak surf with cross-onshore winds chopping it all up. The swell energy is weak, reading around 135 to 187 (moderate to weak), and it’s just not doing anything for us. The weekend isn’t any better. Saturday the 15th brings a fresh breeze, and the surf stays under 3 feet with poor shape. By Sunday the 16th, it drops even further—we’re looking at dribbly 2 to 3 feet waves with hardly any energy behind them (around 67 to 71). It’s flat and frustrating.
The start of the following week is more of the same—small and onshore. Monday the 17th and Tuesday the 18th have a bit more push, around 3 to 4 feet, but the wind is cross-onshore or cross-shore, making it lumpy and hard to ride. The energy is still low to moderate (between 100 and 154). It’s not looking good for anyone.
Then we get a real kick in the teeth. Wednesday the 19th sees the swell jump up, but it’s completely unsurfable. We’re talking 8 to 10 feet of raw, powerful WNW swell, with a combined energy reading of 1106 and a massive 2022 (strong to very strong). The onshore NNW wind at 25 km/h will have it blown out and closing out all over the beach. This is not a day for a paddle; it’s a day to watch from the car park. Thursday the 20th is still too big and sloppy, with 5 to 6 feet onshore and messy conditions, energy still strong at 506 to 1012.
After that stormy blip, the swell fades out quickly. Friday the 21st is the first window that’s even remotely clean—we get a light cross-offshore breeze from the east, but the swell has backed right off to 2 to 3 feet. It’s small and weak, with energy around 70 to 143. It’s surfable, but you’ll be fighting for scraps. Saturday the 22nd is even smaller and goes onshore again, and Sunday the 23rd has a tiny pulse with a light offshore wind in the morning, but it’s still only about 2 feet and very weak—just a 1 out of 10 on the scorecard, so don’t get your hopes up.
The final stretch from Monday the 24th onward is basically a dead zone. There’s occasional small surf, but the winds are all over the place, from messy cross-shore to strong cross-offshore breezes. The energy readings are mostly in the weak range (50 to 190). Even the bigger bump late in the period on Thursday the 27th, with 5 to 6 feet of swell, is riddled with fresh cross-shore winds and lumpy conditions. It’s not going to be pretty.
So, here’s the bottom line. There are no standouts in this 16-day window. The only days that even sniff at being rideable are Friday the 21st and Sunday the 23rd, and those are marginal, knee-to-waist-high grovelers. If you’re desperate for a paddle, those are your shots, but don’t expect any magic.
Given all the onshore slop and the size, there’ll be some days where the kites are having more fun than us. The beach setup here isn’t helping matters, and with that strong, raw swell on the 19th, it’s going to be a full-on washing machine.
Hang tight, mate. It tends not to stay this bad for long, but this run is a proper test of patience.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Thu morning, min 16°C on Sat afternoon). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Tue afternoon, min 17°C on Sun morning). Winds increasing (calm on Sun night, fresh winds from the W by Tue night). | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | W 11 | W 10 | W 10 | W 9 | W 9 | W 8 | W 8 | W 8 | W 8 | N 5 | W 7 | W 7 | WNW 9 | W 8 | W 7 | W 6 | W 6 | WNW 7 | W 7 | WNW 7 | W 7 |
Wave Graph | |||||||||||||||||||||
319 | 284 | 181 | 129 | 152 | 161 | 114 | 98 | 62 | 32 | 25 | 15 | 17 | 48 | 81 | 194 | 139 | 181 | 94 | 77 | 68 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | on | on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | on | on | on |
High Tide | 6:31PM6.76m | 6:54AM6.50m | 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 | ||||||||
Low Tide | 12:34PM0.15m | 1:00AM-0.06m | 1:15PM0.01m | 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 | ||||||||
6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | |
— | 8:44 | — | — | 8:43 | — | — | 8:40 | — | — | 8:38 | — | — | 8:37 | — | — | 8:35 | — | — | 8:32 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 22 | 20 | 21 | 20 | 18 | 18 | 17 | 16 | 18 | 18 | 18 | 20 | 19 | 19 | 20 | 21 | 19 | 18 | 18 | 18 |
Feels °C | 21 | 22 | 21 | 21 | 20 | 17 | 13 | 12 | 12 | 15 | 15 | 19 | 19 | 17 | 17 | 19 | 19 | 16 | 15 | 15 | 16 |
Swell 1 Height (m) Direction Period (s) | W 11 | W 10 | W 10 | W 9 | W 9 | W 8 | W 8 | W 8 | W 8 | WNW 7 | W 7 | W 7 | W 7 | W 8 | SW 16 | SSW 17 | SW 17 | SSW 17 | W 7 | WNW 7 | W 7 |
319 | 284 | 181 | 129 | 152 | 161 | 114 | 98 | 55 | 16 | 25 | 15 | 8 | 48 | 10 | 28 | 11 | 29 | 94 | 77 | 68 | |
Swell 2 Height (m) Direction Period (s) | E 5 | E 4 | E 4 | S 13 | S 13 | SW 13 | — | — | SW 12 | W 8 | SW 18 | SW 18 | WNW 9 | N 4 | — | — | — | — | SSW 16 | SSW 16 | SSW 15 |
8 | 4 | 1 | 3 | 3 | 7 | — | — | 6 | 10 | 13 | 12 | 17 | 1 | — | — | — | — | 25 | 24 | 23 | |
Swell 3 Height (m) Direction Period (s) | — | — | S 11 | S 13 | S 11 | — | — | S 12 | S 20 | S 12 | S 18 | — | NNE 4 | SW 18 | — | — | — | — | — | — | — |
— | — | 2 | 3 | 2 | — | — | 3 | 7 | 3 | 7 | — | 3 | 12 | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | N 4 | N 6 | N 5 | N 5 | N 5 | N 5 | N 4 | — | W 4 | W 7 | W 6 | W 6 | WNW 7 | N 4 | N 5 | N 5 |
— | — | — | — | — | 12 | 105 | 53 | 62 | 32 | 20 | 11 | — | 1 | 81 | 194 | 139 | 181 | 9 | 15 | 11 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 23 | 222 | 15 | 15 | 222 | 28 | 265 | 508 | 253 | 262 | 400 | 495 | 272 | 510 | 311 | 258 | 400 | 262 | 28 | 28 | 28 |
Best forecast wave conditions in North Cornwall | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.











