Surf Forecasts:
St Agnes surf forecast from 16 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 10AM (local time) - 7ft (2.2m), 9s period, WNW swell with 741 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 2.2m 9s and forecast to arrive on Thursday (Aug 20) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Sunday (Aug 23) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Thu 20th Aug) | 7ft (2.2m) 9s |
Table - best surf conditions forecast for St Agnes over the next 16 days.
The Lowdown
Alright, Rusty here.
It's a pretty grim outlook for the St Agnes area through this 16-day window. We’re looking at a long, flat start with nothing surfable until the tail end of the period. There's really only one session that even gets a nod, and even then, it’s not a classic.
Water temps are sitting at 66°, which is a touch warmer than normal for this time of year.
We’re looking at a dry spell from now right through to the morning of Friday the 28th of August. That’s over a week and a half with nothing but onshore chop and tiny, weak swell. The few days around the 19th and 20th see some size (5ft to 7ft) and solid wave energy (up to 783), but it's all cross-onshore and messy—just a washing machine out there.
Then, after that long wait, Friday the 28th of August morning offers a brief glimmer. That morning we’ll see a 6ft swell rolling in from the WSW with a 9-second period. The energy is solid at 541 and, importantly, we’ve got light winds swinging offshore, meaning it should be clean. This is your one shot. The early session, with the clean conditions on a waist-to-chest high swell, will be the only real standout. It’s not perfect, but after weeks of nothing, it’ll feel like a gift.
By the afternoon, the wind swings onshore and kills it. The following days offer more size but with stronger winds and lumpy conditions. For the die-hards, that Friday morning is the only paddle in sight. If you miss it, there’s nothing else on the cards.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Sun night, min 16°C on Mon night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Wed afternoon. Very mild (max 18°C on Wed morning, min 14°C on Fri night). Winds decreasing (fresh winds from the W on Wed afternoon, light winds from the N by Fri night). | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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 7 | WNW 7 | W 7 | WNW 6 | WNW 8 | W 7 | WNW 6 | WNW 6 | WNW 6 | WNW 7 | WNW 7 | W 8 | WNW 9 | WNW 9 | WNW 9 | W 8 | WNW 8 | W 8 | W 10 | W 10 | SW 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 16 | 44 | 12 | 60 | 123 | 74 | 95 | 104 | 143 | 206 | 373 | 736 | 741 | 616 | 346 | 124 | 79 | 50 | 76 | 48 | 54 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 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 | 11:51AM4.44m | 00:32AM4.24m | 1:16PM4.23m | 2:06AM4.17m | ||||||||
Low Tide | 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 | 5:37AM2.10m | 6:16PM2.23m | 6:55AM2.37m | 7:50PM2.36m | ||||||||
 | |  | |  | | | | | |  |  | | |  | | | | | | | |
 | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — |
 | — | 8:38 | — | — | 8:37 | — | — | 8:35 | — | — | 8:32 | — | — | 8:30 | — | — | 8:29 | — | — | 8:27 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | 3 | 1 | — | — | — | — | — | — | — | — |
Temp °C | 17 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 17 | 17 | 18 | 17 | 16 | 15 | 15 | 16 | 15 | 16 |
Feels °C | 14 | 16 | 18 | 18 | 18 | 18 | 17 | 15 | 15 | 12 | 11 | 13 | 13 | 13 | 13 | 12 | 10 | 12 | 11 | 9 | 11 |
Swell 1 Height (m) Direction Period (s) | WNW 7 | W 7 | W 7 | WNW 9 | SW 18 | N 4 | W 8 | SW 17 | SSW 17 | W 9 | SSW 16 | SSW 15 | SSW 14 | SW 14 | SSW 14 | W 8 | WNW 8 | W 8 | N 5 | W 10 | N 6 |
| kJ | 16 | 26 | 8 | 43 | 12 | 1 | 11 | 11 | 29 | 45 | 24 | 23 | 21 | 33 | 19 | 124 | 79 | 50 | 20 | 48 | 39 |
Swell 2 Height (m) Direction Period (s) | WSW 8 | N 4 | — | SW 18 | — | SW 16 | SSW 17 | — | — | NW 11 | — | — | SSW 14 | — | SSW 14 | SSW 13 | SSW 13 | SW 16 | W 10 | SSW 15 | W 9 |
| kJ | 11 | 3 | — | 12 | — | 10 | 28 | — | — | 32 | — | — | 21 | — | 19 | 17 | 17 | 39 | 76 | 21 | 26 |
Swell 3 Height (m) Direction Period (s) | S 12 | SW 18 | SW 18 | — | — | — | — | — | — | SSW 16 | — | — | — | — | — | SSW 16 | SSW 16 | W 11 | SSW 15 | SW 12 | SW 15 |
| kJ | 3 | 13 | 12 | — | — | — | — | — | — | 24 | — | — | — | — | — | 25 | 25 | 21 | 21 | 6 | 54 |
Wind waves Height (m) Direction Period (s) | N 4 | WNW 7 | W 4 | WNW 6 | WNW 8 | W 7 | WNW 6 | WNW 6 | WNW 6 | WNW 7 | WNW 7 | W 8 | WNW 9 | WNW 9 | WNW 9 | N 5 | N 5 | N 5 | — | N 5 | — |
| kJ | 9 | 44 | 7 | 60 | 123 | 74 | 95 | 104 | 143 | 206 | 373 | 736 | 741 | 616 | 346 | 43 | 26 | 12 | — | 36 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 247 | 333 | 247 | 222 | 213 | 285 | 249 | 1145 | 290 | 552 | 213 | 601 | 155 | 222 | 28 | 222 | 222 | 27 | 263 | 272 | 241 |
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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