Surf Forecasts:
Castelejo surf forecast from 17 Aug 2026:
- Best quality surf: Monday 17 Aug, 7PM (local time) - 4ft (1.2m), 8s period, NNW swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 7PM (local time) - 6.5ft (2.0m), 8s period, NW swell with 540 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 7PM (local time) - 4ft (1.2m), 8s period with NNW swell.
Best Forecast Surf Conditions for Castelejo this week:
The surf forecast for Castelejo over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 7PM. The primary swell is predicted to be 1.2m and 8s period with a secondary swell of 0.2m and 9s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Castelejo in the next 16 days are 2.0m 8s and forecast to arrive on Friday (Aug 21) at 7PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Wednesday (Aug 19) at 7PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Mon 17th Aug) | 4ft (1.2m) 8s |
| Best Surf | 7PM (Mon 17th Aug) | 4ft (1.2m) 8s |
| Most Powerful | 7PM (Fri 21st Aug) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Castelejo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s on offer for Castelejo over the next couple of weeks.
Well, I’ll be honest with you, looking at the whole run, there’s a real mixed bag ahead. The first week-and-a-bit is a bit of a grind, with onshore winds messing things up more often than not. The water’s sitting at 67°, which is a fair bit colder than usual for this time of year, so you’ll want a decent wetsuit.
The only true standout in this whole 16-day window is shaping up for Saturday 29th August. We’ve got a good NW groundswell coming in at a solid 7ft, with a period of 10 seconds – that’s proper energy (combined energy of 807). What makes this one special is the early morning: glassy conditions with a light northerly breeze. For a spot that’s very consistent and exposed to the NW, this is your window. That’s a solid expert-level wave though, over 8ft, so it’s not for the faint-hearted. The afternoon does turn onshore, so be on it early.
Before that, there’s a lot of washing machine action. We have a few mornings that are clean, like Tuesday 18th August with glassy 3ft swell, and Thursday 20th August with glassy 1ft swell, but the waves are small and unremarkable. On Saturday 22nd and Sunday 23rd, the swell bumps up but it’s all cross-onshore or onshore, making for choppy, poor conditions. Then we jump to some bigger swell on Friday 28th August, but again it’s blown out with strong NNW winds.
Looking further ahead into the first few days of September, there’s another pulse of solid, long-period NW groundswell pushing 7ft to 7ft, but the wind is relentless from the north-northwest, putting a nasty cross-onshore chop on it. It’s surfable for the die-hards, but not the clean lines we’d all be after.
So, to sum it up: the next week is mostly a write-off. Save your energy, keep an eye on the forecast, and pencil in the morning of Saturday 29th August – if the wind holds, that’s the one to go for. Long-range call, so treat it with a bit of caution, but it’s got potential.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Tue afternoon, min 20°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Thu morning, min 17°C on Fri night). Winds increasing (calm on Thu morning, fresh winds from the NNW by Fri night). | ||||||||||||||||||||
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) | NW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | WNW 10 | WNW 9 | WNW 9 | WNW 9 | NW 9 | NW 8 | NNW 8 | NNW 10 | NNW 10 | NNW 9 | NW 8 | WNW 8 | NNW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 147 | 175 | 133 | 133 | 125 | 100 | 71 | 31 | 39 | 47 | 45 | 44 | 402 | 439 | 414 | 356 | 246 | 127 | 100 | 151 | 202 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | glassy | glassy | cross | cross | off | cross-off | cross-on | glassy | cross-on | on | cross-on | on | cross-on | cross-on | on | on | cross-on | on | on |
High Tide | 6:21PM2.65m | 6:42AM2.45m | 7:02PM2.39m | 7:25AM2.26m | 7:49PM2.13m | 8:18AM2.09m | 8:54PM1.93m | 9:33AM1.97m | 10:25PM1.84m | 11:05AM1.98m | 11:54PM1.90m | 12:19PM2.11m | 00:53AM2.05m | ||||||||
Low Tide | 12:02PM0.38m | 00:27AM0.46m | 12:42PM0.58m | 1:05AM0.69m | 1:28PM0.80m | 1:50AM0.90m | 2:28PM0.99m | 2:53AM1.08m | 3:57PM1.09m | 4:28AM1.14m | 5:38PM1.05m | 5:57AM1.05m | 6:44PM0.90m | ||||||||
 |  |  | | | | | | | | | | | | | | |  | | | | |
 | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — |
 | — | 8:24 | — | — | 8:23 | — | — | 8:22 | — | — | 8:21 | — | — | 8:20 | — | — | 8:19 | — | — | 8:16 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 21 | 21 | 22 | 23 | 22 | 22 | 22 | 21 | 22 | 22 | 21 | 19 | 20 | 18 | 19 | 21 | 21 | 21 | 20 | 20 |
Feels °C | 20 | 21 | 22 | 22 | 22 | 24 | 22 | 23 | 23 | 24 | 22 | 20 | 16 | 15 | 13 | 18 | 20 | 21 | 18 | 16 | 17 |
Swell 1 Height (m) Direction Period (s) | NW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | WNW 9 | WNW 9 | WNW 9 | NNW 12 | NNW 11 | SW 14 | NNW 10 | NNW 10 | NNW 9 | NW 8 | WNW 8 | NNW 9 |
| kJ | 147 | 175 | 133 | 133 | 125 | 100 | 71 | 31 | 30 | 47 | 45 | 44 | 56 | 81 | 7 | 356 | 246 | 127 | 100 | 151 | 202 |
Swell 2 Height (m) Direction Period (s) | NNW 9 | W 9 | WNW 9 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | WNW 10 | NNW 6 | NW 6 | NW 11 | SW 14 | SW 13 | NW 10 | WNW 9 | WNW 9 | WNW 8 | NNW 9 | NW 8 | W 7 |
| kJ | 8 | 7 | 7 | 6 | 6 | 7 | 6 | 6 | 39 | 17 | 9 | 30 | 8 | 7 | 27 | 32 | 25 | 24 | 25 | 74 | 94 |
Swell 3 Height (m) Direction Period (s) | SW 15 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SSW 14 | SW 14 | SW 4 | SW 4 | SSW 4 | SSW 4 | NW 12 | — | SW 13 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 |
| kJ | 8 | 10 | 10 | 10 | 9 | 8 | 20 | 7 | 5 | 3 | 2 | 2 | 6 | — | 7 | 8 | 8 | 7 | 7 | 7 | 7 |
Wind waves Height (m) Direction Period (s) | — | S 3 | — | — | — | — | S 4 | SSW 4 | — | — | — | NW 5 | NW 9 | NW 8 | NNW 8 | — | — | — | — | — | — |
| kJ | — | 1 | — | — | — | — | 1 | 5 | — | — | — | 17 | 402 | 439 | 414 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 4 | 0 | 0 | 4 | 9 | 0 | 0 | 9 | 0 | 79 | 399 | 73 | 227 | 65 | 9 | 11 | 390 | 9 | 381 | 9 |
Best forecast wave conditions in The Algarve | |||||||||||||||||||||
Best forecast wave conditions in Portugal | |||||||||||||||||||||
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Information about the Castelejo Surf forecast
The above surf forecast table for Castelejo provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Castelejo can be found by selecting the local surf guide option on the grey menu. Our Castelejo 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 (Castelejo) 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 Castelejo 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.
Castelejo is 25 km (16 miles) from Lagos. If you plan a holiday in The Algarve, look for hotels and other accommodation in Lagos. Lagos has rooms for a wide range of budgets as well as car hire and transport links.
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