Surf Forecasts:
St Agnes surf forecast from 17 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 4PM (local time) - 6ft (1.8m), 9s period, WNW swell with 589 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 1.8m 9s and forecast to arrive on Thursday (Aug 20) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Saturday (Aug 22) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Thu 20th Aug) | 6ft (1.8m) 9s |
Table - best surf conditions forecast for St Agnes over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the cards for the St Agnes stretch over the next couple of weeks.
To be brutally honest, the first week is a write-off. From Monday the 17th of August right through to Tuesday the 25th, it's a flat, choppy, and messy picture. The wind is mostly howling from the north and northwest, and the swell is weak and short-period, often coming straight from the wrong direction. The wave energy is pitiful, barely scraping into the 100s most days, and the conditions are consistently labelled "poor". You'd be fighting a losing battle out there. It’s a good time to wax the board and wait it out.
Things finally start to get interesting on Wednesday the 26th of August. We’ve got a solid push of WSW swell arriving, with heights around 7ft and a cross-offshore breeze from the SW. The wave energy jumps up to 983 (moderate), and the forecast is for "very good surf conditions". This is the first real standout of the outlook. The swell direction is a pretty good match for St Agnes, and clean conditions look like a goer. The only bummer is the water temperature sits at 65°, which is a touch warmer than normal for this time of year.
The following Friday, the 28th of August, also looks like a highlight. The morning is a bit questionable with a 10ft swell from the WSW and a light cross-on wind, but the afternoon is where it’s at. The swell drops to a much more manageable 6ft, the wind swings to a cross-offshore from the SW, and the energy is a whopping 1426 (very strong). This is rated as "excellent surf conditions for experienced surfers." That 10ft morning swell is a bit of a beast, but the clean afternoon session will be worth the paddle out.
Then, on Sunday the 30th of August, we get another interesting window. The afternoon offers up an 8ft swell from the west with glassy conditions. The wave energy is 1005 (very strong), and the forecast is for "very good surf conditions" again. That glassy wind is a massive plus.
So, the pick of the entire window is the afternoon of Friday the 28th of August – clean, strong, and a solid 6ft for the experienced crew. The Wednesday morning the 26th and the Sunday afternoon the 30th are also very promising. Everything else is either flat, messy, or blown out. Keep your eyes peeled, and check back closer to the time as the long-range forecasts firm up.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Tue night. Warm (max 20°C on Mon morning, min 16°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Thu night. Very mild (max 19°C on Sat afternoon, 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) | WNW 6 | W 8 | W 6 | WNW 6 | WNW 6 | WNW 7 | WNW 9 | W 7 | WNW 8 | WNW 9 | WNW 9 | W 9 | W 8 | W 8 | W 8 | W 10 | W 9 | SW 15 | SW 14 | SW 14 | N 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 60 | 138 | 75 | 134 | 134 | 175 | 326 | 247 | 570 | 540 | 589 | 300 | 136 | 100 | 47 | 45 | 41 | 54 | 31 | 51 | 34 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross | cross-on | cross | cross-on | on | on | cross-on | on | cross-on | cross | cross-off | cross-on | cross | cross-on | cross-on |
High Tide | 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 | 2:47PM4.35m | 3:25AM4.40m | ||||||||
Low Tide | 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 | 8:32AM2.35m | 9:20PM2.18m | ||||||||
 |  |  | | |  | | | | | | |  | | | | |  | | | | |
 | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — |
 | — | 8:37 | — | — | 8:35 | — | — | 8:32 | — | — | 8:30 | — | — | 8:29 | — | — | 8:27 | — | — | 8:24 | — |
mm | — | — | — | — | — | 2 | — | — | 2 | — | — | 1 | 1 | 1 | — | — | — | — | — | — | — |
Temp °C | 20 | 19 | 19 | 19 | 18 | 17 | 19 | 18 | 17 | 18 | 18 | 15 | 17 | 16 | 15 | 18 | 19 | 18 | 18 | 18 | 17 |
Feels °C | 18 | 17 | 18 | 17 | 14 | 14 | 15 | 13 | 13 | 14 | 14 | 13 | 14 | 12 | 12 | 15 | 15 | 15 | 12 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | SW 18 | SW 16 | SSW 17 | SW 17 | SSW 17 | SSW 16 | SSW 16 | SW 15 | SSW 14 | WNW 9 | W 9 | W 8 | W 8 | N 5 | W 10 | NNW 5 | W 9 | N 5 | SW 14 | SSW 14 |
| kJ | 43 | 12 | 10 | 28 | 11 | 29 | 24 | 24 | 36 | 21 | 589 | 300 | 136 | 100 | 23 | 45 | 15 | 25 | 34 | 51 | 20 |
Swell 2 Height (m) Direction Period (s) | SW 18 | — | S 19 | W 8 | — | — | SSW 16 | — | — | — | SW 14 | N 5 | N 5 | N 5 | W 8 | N 4 | W 9 | SW 15 | W 9 | W 9 | ESE 5 |
| kJ | 12 | — | 7 | 4 | — | — | 24 | — | — | — | 33 | 7 | 4 | 29 | 47 | 9 | 41 | 54 | 14 | 6 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SSW 14 | SSW 13 | SSW 13 | SW 16 | SSW 15 | SSW 15 | ESE 5 | SW 14 | ESE 6 | W 9 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 19 | 17 | 17 | 39 | 21 | 21 | 2 | 31 | 3 | 6 |
Wind waves Height (m) Direction Period (s) | WNW 6 | W 8 | W 6 | WNW 6 | WNW 6 | WNW 7 | WNW 9 | W 7 | WNW 8 | WNW 9 | — | — | — | — | — | E 5 | — | N 5 | E 5 | N 5 | N 5 |
| kJ | 60 | 138 | 75 | 134 | 134 | 175 | 326 | 247 | 570 | 540 | — | — | — | — | — | 4 | — | 12 | 17 | 31 | 34 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 402 | 222 | 285 | 283 | 213 | 198 | 211 | 213 | 355 | 155 | 213 | 27 | 22 | 28 | 71 | 6 | 10 | 27 | 298 | 27 | 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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