Surf Forecasts:
St Agnes surf forecast from 15 Sep 2026:
- Best quality surf: Tuesday 22 Sep, 10AM (local time) - 2.5ft (0.8m), 18s period, WNW swell with cross-offshore winds.
- Most powerful swell: Friday 18 Sep, 4AM (local time) - 8ft (2.5m), 12s period, WNW swell with 1,903 kJ wave energy.
- Next surfable swell (1★+): Sunday 20 Sep, 10AM (local time) - 5ft (1.5m), 10s period with W swell.
Best Forecast Surf Conditions for St Agnes this week:
The surf forecast for St Agnes over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 20) at 10AM. The primary swell is predicted to be 1.5m and 10s period with a secondary swell of 0.1m and 14s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at St Agnes in the next 16 days are 2.5m 12s and forecast to arrive on Friday (Sep 18) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 6s period and expected on Wednesday (Sep 16) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Sun 20th Sep) | 5ft (1.5m) 10s |
| Best Surf | 10AM (Tue 22nd Sep) | 2.5ft (0.8m) 18s |
| Most Powerful | 4AM (Fri 18th Sep) | 8ft (2.5m) 12s |
Table - best surf conditions forecast for St Agnes over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s coming up for St Agnes.
Honestly, the first week is mostly a dog. Cross-onshore winds and lumpy conditions are the name of the game. The water is about 64°, which is a touch warmer than normal for this time of year – nice for a spring suit, but nothing crazy.
The first real chance to score comes on Sunday morning, September 20th. We’re looking at glassy conditions with a 5ft swell from the west, period around 10 seconds. It’s not huge, but the clean surface will make those chest-high waves feel a lot better than the choppy stuff we’ve had. Worth a dawn patrol.
Monday the 21st has another glass-off in the early morning with a 3ft west swell, period 12 seconds. Again, small, but clean as a whistle. A fun little session on a log or mid-length for sure.
The real standout is the morning of Saturday, September 26th. We’ve got a solid 6ft swell from the WNW, with a long 14-second period – real groundswell – and clean, moderate offshore winds from the southeast. The combined energy is a thumping 1349, so there’s plenty of punch. This is a setup for experienced surfers looking for speed and shape. Without a doubt, this is the best session in the whole 16-day window.
Sunday the 27th shows a bit more size (8ft) but the period drops off, so it won’t have the same grunt. Then on Monday the 28th, we see a massive 15ft west swell – but the data warns it’s too big for this break. With a cross-onshore breeze, it’ll be a mess. The energy reading is an absurd 3921, but that’s just not the right swell for St Agnes. Late in the window, on Wednesday the 30th, the winds turn clean and offshore again, with a 7ft swell from the WSW and a period of 11 seconds. For the strong paddlers, the afternoon gets even bigger at 10ft with clean offshores – that’s expert territory only, but a serious option if you’ve got the nerve.
So, tough start, a couple of small clean windows mid-week, and the big payoff is that Saturday the 26th. Mark it.
Rusty.
Short Range ForecastSome drizzle, heaviest during Wed night. Very mild (max 16°C on Tue morning, min 14°C on Wed morning). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Fri afternoon. Very mild (max 18°C on Sun afternoon, min 15°C on Fri morning). Winds decreasing (fresh winds from the W on Fri afternoon, calm by Sun night). | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | |||||||||||||||
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 8 | WNW 8 | WNW 9 | WNW 11 | WNW 11 | W 10 | W 8 | WNW 9 | WNW 10 | WNW 13 | W 12 | W 8 | W 8 | W 10 | W 10 | W 10 | W 10 | W 10 | W 12 | W 11 | W 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 407 | 437 | 740 | 1027 | 778 | 586 | 596 | 692 | 1111 | 1408 | 1190 | 378 | 337 | 766 | 578 | 443 | 339 | 255 | 284 | 242 | 208 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | cross-on | cross | cross-on | cross-on | cross-on | cross | cross-off | cross | cross | cross | cross-on | glassy | cross-on | cross-on | glassy | on | cross-on |
High Tide | 8:33PM6.00m | 8:49AM5.79m | 9:08PM5.53m | 9:25AM5.34m | 9:45PM5.02m | 10:05AM4.86m | 10:31PM4.52m | 11:00AM4.42m | 11:41PM4.13m | 12:28PM4.15m | 1:29AM4.03m | 2:15PM4.26m | 2:57AM4.30m | ||||||||
Low Tide | 2:30PM0.57m | 2:47AM0.82m | 3:03PM0.97m | 3:19AM1.26m | 3:39PM1.43m | 3:56AM1.72m | 4:23PM1.89m | 4:45AM2.16m | 5:28PM2.29m | 6:06AM2.47m | 7:12PM2.45m | 7:56AM2.45m | 8:48PM2.23m | ||||||||
 | |  |  |  |  | | |  | |  | | | | | | | | | | | |
 | 6:54 | — | — | 6:56 | — | — | 6:58 | — | — | 7:00 | — | — | 7:01 | — | — | 7:03 | — | — | 7:03 | — | — |
 | — | 7:36 | — | — | 7:32 | — | — | 7:30 | — | — | 7:29 | — | — | 7:27 | — | — | 7:23 | — | — | 7:22 | — |
mm | — | — | — | — | — | 1 | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 16 | 14 | 15 | 16 | 16 | 16 | 15 | 16 | 17 | 17 | 17 | 17 | 17 | 16 | 18 | 17 | 19 | 19 | 17 |
Feels °C | 11 | 10 | 12 | 10 | 11 | 12 | 10 | 9 | 9 | 12 | 13 | 14 | 15 | 16 | 16 | 16 | 18 | 18 | 20 | 19 | 16 |
Swell 1 Height (m) Direction Period (s) | S 11 | S 11 | S 11 | WNW 11 | WNW 11 | N 5 | — | S 13 | S 13 | SW 12 | S 17 | WNW 12 | WNW 11 | SW 15 | W 10 | W 10 | W 10 | W 10 | W 12 | W 11 | W 10 |
| kJ | 2 | 2 | 2 | 1027 | 778 | 9 | — | 3 | 3 | 6 | 6 | 199 | 164 | 9 | 578 | 443 | 339 | 255 | 284 | 242 | 208 |
Swell 2 Height (m) Direction Period (s) | — | — | S 11 | S 11 | N 6 | S 13 | — | — | — | S 18 | S 12 | SW 16 | SW 16 | — | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 |
| kJ | — | — | 2 | 2 | 29 | 4 | — | — | — | 6 | 3 | 10 | 10 | — | 8 | 8 | 8 | 7 | 7 | 7 | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | S 18 | S 15 | S 12 | S 12 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 6 | 4 | 3 | 3 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 8 | WNW 8 | WNW 9 | N 6 | — | W 10 | W 8 | WNW 9 | WNW 10 | WNW 13 | W 12 | W 8 | W 8 | W 10 | — | — | — | — | — | — | SE 6 |
| kJ | 407 | 437 | 740 | 29 | — | 586 | 596 | 692 | 1111 | 1408 | 1190 | 378 | 337 | 766 | — | — | — | — | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 222 | 290 | 97 | 28 | 213 | 506 | 555 | 222 | 155 | 231 | 213 | 231 | 231 | 213 | 155 | 0 | 15 | 8 | 0 | 28 | 6 |
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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