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Surf Forecasts:
Coxos surf forecast from 11 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 1AM (local time) - 11ft (3.5m), 9s period, NNW swell with 1,736 kJ wave energy.
Best Forecast Surf Conditions for Coxos this week:
The most powerful waves expected at Coxos in the next 16 days are 3.5m 9s and forecast to arrive on Sunday (Aug 16) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 16s period and expected on Tuesday (Aug 18) at 1AM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Sun 16th Aug) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Coxos over the next 16 days.
The Lowdown
Alright, Rusty here, checking out the next 16 days for Coxos. It’s a reef, open to the swell, and it needs that clean NNW line to really work. The first few days are a bust. The swell is small, the wind is all cross-onshore, and the water is a lumpy mess. Combined energy is weak, running 130 to 198 (moderate wave energy), but it’s just not clean.
Things get a pulse on Sunday the 16th. We’ve got a 10ft swell from the NNW, period of 9 seconds, and a combined energy of 1266 (strong wave energy). The wind is onshore, though, and the report says it’s a marginal tide call. It’s a big, powerful day, but it’s not going to be that pretty.
The big one, the one that’s got my full attention, is the morning of Thursday the 20th of August. Another 10ft NNW swell, period of 9 seconds, and the combined energy is a massive 1210 (strong wave energy). The wind is cross-onshore. At 10ft, this is a serious, expert-only reef break. The power is immense. The cross-onshore wind isn’t ideal, but it’s the most raw, powerful swell we see in the whole run.
Friday the 21st and Saturday the 22nd are just enormous, with swells up to 12ft. The combined energy peaks at 1827 (very strong wave energy) on Saturday the 22nd, but the wind is a strong cross-onshore, making it a total mess. That’s a kite surfer’s dream, not a surfer’s.
The end of the window calms down. The 23rd has a 8ft swell with a cross-onshore breeze, energy still high at 1029. Then we drop back to 3-4ft by the 25th and 26th, with energy around 200 (moderate wave energy), but the wind is still cross-onshore. It’s small and choppy.
So, for the brave and the skilled, the morning of Thursday 20th August is the standout. It’s a heavy, powerful, expert-only session. For the rest of us, the whole 16 days is a battle with the wind. The water temp is 70°, which is right on the average for this time of year.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Wed afternoon, min 19°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Sun morning, min 20°C on Fri night). Mainly strong winds. | |||||||||||||||||||
Tue 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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) | NNW 12 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | NNW 6 | NNW 7 | NNW 7 | NNW 8 | NNW 8 | NNW 9 | NNW 9 | NNW 9 | NNW 9 | NNW 9 | NNW 8 | NNW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 53 | 77 | 120 | 154 | 154 | 154 | 241 | 175 | 149 | 158 | 412 | 662 | 700 | 1736 | 1266 | 887 | 898 | 851 | 588 | 763 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | on | cross-on |
High Tide | 3:01AM2.79m | 3:17PM3.16m | 3:45AM2.89m | 4:01PM3.26m | 4:27AM2.93m | 4:42PM3.25m | 5:07AM2.90m | 5:22PM3.14m | 5:45AM2.80m | 6:01PM2.95m | 6:23AM2.67m | 6:40PM2.71m | ||||||||
Low Tide | 8:50PM0.09m | 9:01AM0.19m | 9:36PM-0.05m | 9:45AM0.08m | 10:18PM-0.10m | 10:26AM0.04m | 10:58PM-0.07m | 11:05AM0.09m | 11:36PM0.05m | 11:44AM0.20m | 00:12AM0.24m | 12:23PM0.38m | 00:49AM0.46m | |||||||
 |  |  | | | | | | | |  | | |  | | | | | | | |
 | — | — | 6:47 | — | — | 6:48 | — | — | 6:48 | — | — | 6:50 | — | — | 6:50 | — | — | 6:52 | — | — |
 | 8:37 | — | — | 8:37 | — | — | 8:36 | — | — | 8:34 | — | — | 8:32 | — | — | 8:31 | — | — | 8:30 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 20 | 22 | 23 | 20 | 22 | 22 | 20 | 22 | 22 | 21 | 22 | 22 | 20 | 23 | 23 | 20 | 22 | 22 | 20 |
Feels °C | 20 | 19 | 21 | 22 | 19 | 21 | 21 | 18 | 20 | 20 | 18 | 19 | 19 | 15 | 23 | 23 | 19 | 21 | 19 | 16 |
Swell 1 Height (m) Direction Period (s) | NNW 12 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | — | S 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | NNW 9 | SW 15 | SSW 16 |
| kJ | 53 | 77 | 120 | 154 | 154 | 154 | 241 | 175 | 130 | 127 | — | 6 | 12 | 11 | 10 | 11 | 9 | 851 | 9 | 26 |
Swell 2 Height (m) Direction Period (s) | WNW 11 | NNW 10 | NNW 10 | NNW 9 | NNW 10 | NW 12 | N 9 | — | — | — | — | — | — | — | — | — | — | SW 15 | — | S 13 |
| kJ | 23 | 58 | 51 | 47 | 33 | 37 | 14 | — | — | — | — | — | — | — | — | — | — | 9 | — | 3 |
Swell 3 Height (m) Direction Period (s) | NNW 8 | — | — | — | — | NNW 10 | — | — | — | — | — | — | — | — | — | — | — | SW 18 | — | — |
| kJ | 14 | — | — | — | — | 18 | — | — | — | — | — | — | — | — | — | — | — | 13 | — | — |
Wind waves Height (m) Direction Period (s) | NNW 6 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 5 | NNW 6 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 8 | NNW 8 | NNW 9 | NNW 9 | NNW 9 | NNW 9 | — | NNW 8 | NNW 8 |
| kJ | 40 | 41 | 27 | 29 | 44 | 40 | 61 | 102 | 149 | 158 | 412 | 662 | 700 | 1736 | 1266 | 887 | 898 | — | 588 | 763 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 399 | 34 | 34 | 37 | 34 | 34 | 223 | 37 | 126 | 563 | 223 | 190 | 565 | 192 | 36 | 583 | 36 | 36 | 226 | 132 |
Best forecast wave conditions in Ericeira | ||||||||||||||||||||
Best forecast wave conditions in Portugal | ||||||||||||||||||||
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Information about the Coxos Surf forecast
The above surf forecast table for Coxos provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Coxos can be found by selecting the local surf guide option on the grey menu. Our Coxos 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 (Coxos) 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 Coxos 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.
Are you planning a holiday in Ericeira? If you are looking for accommodation near Coxos, camping, hotels and holiday cottages in Ericeira, consider staying in Torres Vedras which is 18 km (11 miles) away. Other places in and around Ericeira where you can find information about places to rent, and car hire include Sintra which is 22 km (14 miles) away, Rio de Mouro, Cacem and Loures.
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