Surf Forecasts:
Costa Nova surf forecast from 17 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 4AM (local time) - 5ft (1.6m), 8s period, NNW swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 10AM (local time) - 7ft (2.2m), 10s period, NNW swell with 926 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 4AM (local time) - 5ft (1.6m), 8s period with NNW swell.
Best Forecast Surf Conditions for Costa Nova this week:
The surf forecast for Costa Nova over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 4AM. The primary swell is predicted to be 1.6m and 8s period with a secondary swell of 0.2m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Costa Nova in the next 16 days are 2.2m 10s and forecast to arrive on Friday (Aug 21) at 10AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Tue 18th Aug) | 5ft (1.6m) 8s |
| Best Surf | 4AM (Tue 18th Aug) | 5ft (1.6m) 8s |
| Most Powerful | 10AM (Fri 21st Aug) | 7ft (2.2m) 10s |
Table - best surf conditions forecast for Costa Nova over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's break down this forecast for Costa Nova. To be honest, the next couple of weeks are going to test your patience. There's some surf, but the wind is going to be the main character, and not in a good way.
Right off the bat, Monday and Tuesday are a total write-off. The surf is small, the wind is onshore, and it's all just messy. The middle of the week isn't much better. There's a bit of a glassy spell Thursday morning, but the swell is tiny, barely a ripple (96), so it's not worth the effort.
The first real pulse of swell arrives Friday morning. We're looking at waves around 7ft, with a strong energy reading (941), but a cross-shore wind will chop it all up. For the next several days after that, it’s the same story. We'll see some decent size, with waves in the 6-7ft range, but the cross-onshore winds will keep it lumpy and uninviting. It's likely more of a day for the kite surfers than us paddle guys, to be honest.
The one bright spot in the whole first two weeks is that Friday the 28th. Glassy conditions and a solid 5-6ft of swell (379) are on the cards. That's a proper surf, but it's a one-off.
The real gold is at the very end of the forecast period. On Tuesday, the 1st of September, we finally get a clean start to the day. The swell is up to 8ft, the energy is strong (916), and the wind is glassy offshore. It’s a long way off, so treat it as a very promising, but not certain, day. The water temp is about 68°, which is normal for the area.
So, my advice is to keep your board handy for that 28th, and really mark your calendar for the 1st of September. Everything else, you’re just waiting for the wind to play ball.
Rusty out.
Short Range ForecastMostly dry. Warm (max 26°C on Mon afternoon, min 18°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 20°C on Thu afternoon, min 16°C on Sat night). Mainly fresh winds. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 7 | NNW 7 | WNW 10 | WNW 9 | WNW 9 | NW 11 | NW 7 | NNW 10 | NNW 10 | NNW 6 | NNW 9 | NNW 6 | NNW 8 | NNW 8 | NNW 7 | NNW 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 204 | 327 | 204 | 133 | 86 | 53 | 38 | 65 | 62 | 61 | 524 | 926 | 733 | 315 | 445 | 200 | 662 | 419 | 443 | 355 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | cross-off | cross | on | glassy | glassy | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross |
High Tide | 7:13PM3.00m | 7:32AM2.79m | 7:52PM2.79m | 8:14AM2.64m | 8:38PM2.57m | 9:09AM2.49m | 9:47PM2.39m | 10:35AM2.40m | 11:28PM2.32m | 12:09PM2.43m | 00:52AM2.38m | 1:18PM2.55m | 1:51AM2.51m | |||||||
Low Tide | 1:10AM1.05m | 1:24PM1.12m | 1:49AM1.22m | 2:08PM1.30m | 2:33AM1.39m | 3:02PM1.47m | 3:29AM1.54m | 4:14PM1.59m | 4:45AM1.63m | 5:45PM1.61m | 6:12AM1.60m | 7:07PM1.50m | ||||||||
 |  | |  | | | |  | | | | | | | | | | | | | |
 | — | — | 6:47 | — | — | 6:48 | — | — | 6:48 | — | — | 6:50 | — | — | 6:50 | — | — | 6:52 | — | — |
 | 8:30 | — | — | 8:29 | — | — | 8:28 | — | — | 8:25 | — | — | 8:24 | — | — | 8:22 | — | — | 8:22 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 22 | 21 | 22 | 22 | 20 | 20 | 20 | 19 | 18 | 18 | 18 | 19 | 19 | 19 | 18 | 18 | 18 |
Feels °C | 23 | 25 | 23 | 22 | 22 | 21 | 22 | 23 | 20 | 19 | 17 | 14 | 13 | 16 | 17 | 15 | 16 | 13 | 12 | 14 |
Swell 1 Height (m) Direction Period (s) | W 9 | SW 16 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 6 | WNW 9 | WNW 9 | WNW 9 | SW 16 | SW 15 | W 9 | W 8 | W 8 | WNW 9 | W 9 | WNW 8 | SW 13 | SW 13 |
| kJ | 6 | 11 | 204 | 133 | 86 | 53 | 22 | 65 | 62 | 61 | 9 | 9 | 38 | 36 | 37 | 26 | 14 | 13 | 7 | 7 |
Swell 2 Height (m) Direction Period (s) | SW 17 | W 17 | W 8 | WNW 8 | WNW 8 | WNW 8 | WNW 10 | NNW 5 | NW 11 | NNW 7 | W 16 | SW 12 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | — | W 9 |
| kJ | 11 | 5 | 5 | 6 | 13 | 12 | 38 | 9 | 31 | 37 | 5 | 6 | 8 | 8 | 7 | 8 | 8 | 7 | — | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | SW 16 | SW 16 | SW 15 | WNW 11 | WSW 14 | SW 3 | NW 4 | NW 11 | — | — | — | SW 14 | SW 14 | — | — | — | — | — |
| kJ | — | — | 10 | 10 | 9 | 12 | 20 | 2 | 3 | 56 | — | — | — | 8 | 7 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 8 | NNW 8 | — | SW 3 | SW 4 | SSW 3 | SW 3 | — | — | WNW 2 | NW 7 | NNW 10 | NNW 10 | NNW 6 | NNW 9 | NNW 6 | NNW 8 | NNW 8 | NNW 7 | NNW 7 |
| kJ | 204 | 327 | — | 4 | 3 | 2 | 6 | — | — | 1 | 524 | 926 | 733 | 315 | 445 | 200 | 662 | 419 | 443 | 355 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 357 | 32 | 34 | 220 | 0 | 48 | 218 | 0 | 0 | 221 | 76 | 361 | 218 | 58 | 221 | 248 | 248 | 76 | 248 | 100 |
Best forecast wave conditions in Beira | ||||||||||||||||||||
Best forecast wave conditions in Portugal | ||||||||||||||||||||
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Information about the Costa Nova Surf forecast
The above surf forecast table for Costa Nova provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Costa Nova can be found by selecting the local surf guide option on the grey menu. Our Costa Nova 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 (Costa Nova) 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 Costa Nova 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.
Costa Nova is 8 km (5 miles) from the city of Ilhavo. If you plan a holiday in Beira, look for hotels and other accommodation in Ilhavo. Ilhavo has rooms for a wide range of budgets as well as car hire and transport links.
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