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Surf Forecasts:
Coxos surf forecast from 17 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 1AM (local time) - 4.5ft (1.4m), 8s period, NNW swell with glassy winds.
- Most powerful swell: Friday 21 Aug, 7PM (local time) - 6.5ft (2.0m), 10s period, NNW swell with 731 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 1AM (local time) - 4.5ft (1.4m), 8s period with NNW swell.
Best Forecast Surf Conditions for Coxos this week:
The surf forecast for Coxos over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 1AM. The primary swell is predicted to be 1.4m and 8s period with a secondary swell of 0.2m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Coxos in the next 16 days are 2.0m 10s and forecast to arrive on Friday (Aug 21) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Tuesday (Aug 18) at 4PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Tue 18th Aug) | 4.5ft (1.4m) 8s |
| Best Surf | 1AM (Tue 18th Aug) | 4.5ft (1.4m) 8s |
| Most Powerful | 7PM (Fri 21st Aug) | 6.5ft (2.0m) 10s |
Table - best surf conditions forecast for Coxos over the next 16 days.
The Lowdown
Alright, let’s get into it. I’m looking at the 16-day picture for Coxos. It’s a reef break for advanced surfers, and it’s fairly consistent, though it can get crowded. The water is a bit colder than normal for this time of year, sitting at about 67°F with a -2°F anomaly, so you might want a 3/2 steam if you’re used to warmer.
Right out of the gate, Monday morning, 17 August, is the standout. You’ve got a 6 ft swell from the NNW with an 8-second period, and combined wave energy is a moderate 357. Winds are light ENE at 3 mph, cross-offshore, so it’s going to be clean as a whistle. That’s the best on offer in the whole window. It’s not huge, but the conditions are prime.
Tuesday morning, 18 August, is your next decent window. Swell drops a touch to 5 ft, still NNW, but winds switch to a SSW cross-off at 9 mph. Combined energy is 294. It’s clean again, but not quite as glassy as Monday.
After Tuesday afternoon, things go pretty grim. We get a long stretch of poor surf conditions starting Wednesday, 19 August, through to the end of the month. Winds turn cross-on and onshore, with speeds picking up to 19-25 mph. Swell heights bounce around, but the quality is shot. There’s a bump in size on Friday, 21 August (7-7 ft), but with 19 mph NNW onshore wind, it’s messy and probably better left to the kite crowd.
Towards the end, on Saturday, 29 August, the swell starts to push hard. You’ve got a 8 ft to 10 ft NNW swell with a 10-13 second period, and combined energy hits 1438 and then 2979. That’s strong energy, but winds are still cross-onshore at 16-22 mph. The lines will be lumpy and choppy. For advanced guys only, if you’re desperate. Then into Sunday, 30 August, more of the same: 8 ft swell, 12-second period, but those N winds at 22 mph cross-on. The second week is all about size, but no clean windows.
So, to sum it up: keep your eyes locked on Monday morning, 17 August. That’s your best chance for clean, fun waves. After that, it’s a long wait for something decent, and the forecast into September looks like a big, windy mess.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Mon afternoon. Warm (max 26°C on Mon morning, min 20°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Thu morning, min 18°C on Thu night). Mainly fresh winds. | ||||||||||||||||||||
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) | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | WNW 9 | WNW 9 | WNW 9 | NW 9 | NNW 8 | NNW 8 | NNW 10 | NNW 10 | NNW 9 | NW 9 | W 7 | NNW 8 | NW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 352 | 277 | 226 | 277 | 232 | 163 | 94 | 74 | 50 | 45 | 61 | 202 | 564 | 322 | 636 | 437 | 287 | 182 | 279 | 192 | 456 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | on | glassy | cross-off | cross | glassy | cross | cross-on | glassy | cross | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | on | on | on | on |
High Tide | 6:40PM2.71m | 7:02AM2.50m | 7:21PM2.44m | 7:44AM2.32m | 8:08PM2.18m | 8:37AM2.15m | 9:12PM1.98m | 9:50AM2.03m | 10:42PM1.88m | 11:22AM2.03m | 00:11AM1.94m | 12:36PM2.16m | 1:11AM2.08m | ||||||||
Low Tide | 12:23PM0.38m | 00:49AM0.46m | 1:04PM0.59m | 1:27AM0.69m | 1:50PM0.80m | 2:12AM0.91m | 2:50PM1.00m | 3:15AM1.09m | 4:18PM1.11m | 4:48AM1.16m | 5:56PM1.07m | 6:14AM1.07m | 7:03PM0.92m | ||||||||
 |  |  | | |  | | | | | |  | | | | |  | | | | | |
 | 6:52 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — |
 | — | 8:30 | — | — | 8:29 | — | — | 8:28 | — | — | 8:25 | — | — | 8:24 | — | — | 8:22 | — | — | 8:22 | — |
mm | — | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 24 | 21 | 24 | 24 | 21 | 23 | 23 | 21 | 22 | 22 | 19 | 20 | 20 | 18 | 21 | 22 | 20 | 21 | 21 | 20 |
Feels °C | 26 | 24 | 22 | 23 | 23 | 24 | 23 | 23 | 23 | 23 | 21 | 15 | 15 | 15 | 15 | 19 | 20 | 19 | 17 | 17 | 17 |
Swell 1 Height (m) Direction Period (s) | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 6 | WNW 9 | WNW 9 | NW 9 | NNW 11 | NNW 10 | WNW 9 | NNW 10 | NNW 9 | NW 9 | W 7 | NNW 8 | NW 8 |
| kJ | 352 | 277 | 226 | 277 | 232 | 163 | 94 | 74 | 30 | 45 | 61 | 202 | 186 | 250 | 42 | 437 | 287 | 182 | 279 | 192 | 456 |
Swell 2 Height (m) Direction Period (s) | W 8 | W 9 | W 8 | W 8 | SSW 16 | WNW 8 | WNW 8 | NW 10 | WNW 9 | NNW 5 | NNW 5 | NNW 12 | SSW 15 | WNW 9 | SSW 14 | W 9 | W 9 | WNW 8 | NNW 8 | WSW 7 | WSW 6 |
| kJ | 4 | 6 | 5 | 10 | 24 | 13 | 12 | 27 | 50 | 11 | 9 | 85 | 21 | 62 | 18 | 39 | 39 | 23 | 96 | 153 | 25 |
Swell 3 Height (m) Direction Period (s) | SW 15 | SW 15 | SSW 16 | SW 16 | WNW 8 | SSW 15 | SW 14 | WNW 8 | SSW 4 | SSW 4 | NW 11 | SSW 15 | SW 12 | SSW 15 | NNW 12 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | W 9 |
| kJ | 9 | 9 | 26 | 10 | 6 | 21 | 33 | 6 | 4 | 4 | 31 | 21 | 6 | 21 | 14 | 20 | 20 | 20 | 18 | 17 | 6 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SW 3 | — | — | SSW 2 | — | — | — | NNW 5 | NNW 8 | NNW 8 | NNW 10 | — | — | — | — | — | — |
| kJ | — | — | — | — | 2 | — | — | 1 | — | — | — | 75 | 564 | 322 | 636 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 36 | 0 | 0 | 218 | 0 | 4 | 31 | 0 | 20 | 144 | 399 | 243 | 363 | 34 | 34 | 226 | 494 | 223 | 428 | 37 |
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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