
Surf Forecasts:
Coxos surf forecast from 9 Sep 2026:
- Best quality surf: Sunday 13 Sep, 10AM (local time) - 3.5ft (1.0m), 13s period, NW swell with glassy winds.
- Most powerful swell: Sunday 13 Sep, 10PM (local time) - 5.5ft (1.7m), 12s period, NW swell with 808 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 7AM (local time) - 3ft (0.9m), 14s period with NW 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 Sunday (Sep 13) at 7AM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 1.1m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Coxos in the next 16 days are 1.7m 12s and forecast to arrive on Sunday (Sep 13) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 11s period and expected on Sunday (Sep 13) at 10PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Sun 13th Sep) | 3ft (0.9m) 14s |
| Best Surf | 10AM (Sun 13th Sep) | 3.5ft (1.0m) 13s |
| Most Powerful | 10PM (Sun 13th Sep) | 5.5ft (1.7m) 12s |
Table - best surf conditions forecast for Coxos over the next 16 days.
The Lowdown
Alright, let's get into it. We've got a stretch of days ahead where the ocean's got a lot of movement but the wind's going to be battling the quality for a while. We're looking at some solid pulses of swell that get chopped up, a couple of clean windows that are definitely worth a paddle, and a long stretch of junky conditions before we see a final clean, small lull.
The Early Stretch: Lumpy and Choppy
We start off on Wednesday the 9th with clear skies but a fresh 30 km/h north wind blowing straight onshore, making it lumpy. Swell is around 6ft from the NNW with a short, weak 8-second period. The energy is weak to moderate (369-427), but the surface is all over the shop. This is not your morning for a wave. Thursday morning is similar, 6ft at 8 seconds (606), still cross-onshore and choppy. Thursday afternoon backs off in size to 4ft, and the period jumps up to 11 seconds (539), but the NW wind is still fresh and ruining any chance of a clean face. Friday and Saturday look pretty average too, with the cross-on wind never really letting up. You're going to be dealing with 4ft to 5ft of wind-affected slop (183-307). It’s just poor out there, to be honest.
The First Real Window: Sunday Morning
Now, this is more like it. Sunday the 13th, the wind drops out entirely and we get a glassy morning. It’s still a small day, 3ft from the NW, but the period is a solid 13 seconds (512) and the water is flat, clean, and inviting. You’ll be paddling out at Coxos, and you’re in for a treat compared to the last few days. There’s not a ton of push, but it’ll be the best shape you've seen in a while. The water is a bit colder than normal for the time of year, at 66°, so keep that in mind. The afternoon cleans up with a light NW onshore, but the morning is where it’s at. This and Monday morning are your best bets for the first week, with similar cleaner conditions, but it’s marginal.
A Long Stretch of Poor Surf
From Monday the 14th, things start to get messy again. The wind clocks back onshore, and the swell drops off. We’re looking at wind-blown, weak waves for days. The 15th and 16th are poor, with a stiffening wind and not much energy. The 17th and 18th get bigger again, 5ft to 7ft, but it’s all coming with 25-35 km/h cross-onshore winds, so it’s a raw, lumpy mess. The energy levels are up (509-665), but you're not going to want any part of it. There’s a lot of water moving and it’s just messy on the surface. This is one of those periods where the raw power is there but the planets are not aligned for a quality surf.
Second Week Promise: A Clean, Smaller End?
The next real clean window doesn’t show up until the very end of the forecast period. On Tuesday the 22nd, we finally see a shift. The wind goes light from the ENE, a cross-offshore, and we get clean conditions. The swell is tiny, just 3ft from the WNW with an 11-second period (141), but it’s clean. This isn’t going to be a big day, but it might be a "few little runners" day. Wednesday the 23rd morning is similar, with a light offshore SE wind and 2ft swell (135). It’s marginal, but clean. For the final period after the 17th, the standouts are these clean mornings, but you have to be flexible and ready to paddle for small waves.
The Standout
If I had to point to the one true standout on offer, it’s Coxos on Sunday morning, September 13. The glassy conditions, the long 13-second period from the NW, and the promise of clean, well-shaped waves on a quality reef break make this the clear winner. It won’t be big, but it will be clean, and that’s worth a lot. Keep an eye on Monday the 14th as a consolation, with similar but slightly smaller surf.
A Note on the Water
Remember that water temp at the start is 66°, a bit colder than usual. It’s a trend worth noting for your wetsuit choice.
Alright, that’s the long and short of it. It’s going to be a period of being patient, cleaning your board, and picking your moments. The surf will be there, just not every day.
Catch you in the water.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Fri morning, min 18°C on Wed afternoon). Winds decreasing (fresh winds from the NNW on Wed afternoon, light winds from the N by Fri night). | Days 4-6 Weather SummaryMostly dry. Warm (max 30°C on Sun morning, min 20°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||
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 11 | NNW 10 | NNW 7 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NW 13 | NW 12 | NNW 12 | NW 11 | NW 11 | NW 10 | NNW 10 | NNW 9 | NNW 9 |
Wave Graph | |||||||||||||||||||||
365 | 419 | 471 | 421 | 308 | 218 | 173 | 133 | 103 | 128 | 105 | 118 | 342 | 528 | 756 | 357 | 233 | 124 | 151 | 130 | 88 | |
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 | on | cross-on | glassy | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 2:16PM3.00m | 2:45AM2.80m | 2:59PM3.15m | 3:25AM2.92m | 3:38PM3.21m | 4:01AM2.96m | 4:15PM3.17m | 4:36AM2.94m | 4:51PM3.04m | 5:10AM2.86m | 5:26PM2.85m | 5:44AM2.73m | 6:02PM2.62m | ||||||||
Low Tide | 8:37PM0.08m | 8:45AM0.17m | 9:16PM-0.04m | 9:25AM0.07m | 9:53PM-0.07m | 10:02AM0.03m | 10:27PM-0.02m | 10:38AM0.08m | 11:00PM0.11m | 11:13AM0.19m | 11:32PM0.29m | 11:48AM0.36m | 00:04AM0.50m | ||||||||
7:13 | — | — | 7:13 | — | — | 7:13 | — | — | 7:15 | — | — | 7:16 | — | — | 7:16 | — | — | 7:18 | — | — | |
— | 7:55 | — | — | 7:54 | — | — | 7:52 | — | — | 7:51 | — | — | 7:50 | — | — | 7:47 | — | — | 7:46 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 19 | 18 | 21 | 20 | 18 | 22 | 22 | 19 | 26 | 24 | 25 | 30 | 27 | 26 | 28 | 26 | 23 | 21 | 21 | 18 |
Feels °C | 15 | 13 | 13 | 18 | 16 | 14 | 20 | 19 | 18 | 25 | 23 | 22 | 28 | 26 | 24 | 26 | 25 | 23 | 21 | 19 | 15 |
Swell 1 Height (m) Direction Period (s) | N 13 | N 15 | NNW 12 | NNW 11 | NNW 11 | NNW 10 | NNW 10 | N 9 | WNW 9 | NNW 7 | NNW 7 | NNW 7 | NNW 8 | NW 12 | NNW 12 | NW 11 | NNW 7 | NW 10 | NNW 10 | WNW 8 | WNW 11 |
4 | 4 | 85 | 183 | 308 | 218 | 128 | 61 | 15 | 128 | 105 | 118 | 131 | 528 | 756 | 357 | 97 | 124 | 151 | 22 | 81 | |
Swell 2 Height (m) Direction Period (s) | — | N 15 | NW 10 | W 11 | WNW 7 | W 7 | W 7 | W 7 | N 9 | WNW 10 | WNW 9 | WNW 9 | NW 13 | NNW 7 | NNW 7 | NNW 7 | NW 11 | NNW 7 | WNW 8 | NW 12 | WNW 8 |
— | 4 | 25 | 2 | 11 | 4 | 4 | 4 | 16 | 55 | 69 | 46 | 342 | 97 | 89 | 94 | 233 | 47 | 22 | 23 | 12 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | NW 10 | W 9 | W 8 | W 11 | SW 13 | NW 18 | NW 15 | W 9 | S 12 | S 11 | S 11 | WNW 9 | WNW 8 | NW 13 | — | N 13 |
— | — | — | — | — | 4 | 2 | 1 | 2 | 7 | 12 | 109 | 39 | 3 | 2 | 2 | 46 | 28 | 7 | — | 3 | |
Wind waves Height (m) Direction Period (s) | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | — | — | — | — | — | — | — | — | — | — | NNW 9 | NNW 9 |
365 | 419 | 471 | 421 | 220 | 200 | 173 | 133 | 103 | — | — | — | — | — | — | — | — | — | — | 130 | 88 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 263 | 583 | 132 | 45 | 472 | 45 | 37 | 223 | 32 | 1 | 201 | 2 | 0 | 34 | 1 | 29 | 37 | 34 | 37 | 598 | 418 |
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.










