Surf Forecasts:
Costa Nova surf forecast from 25 Aug 2026:
- Best quality surf: Friday 28 Aug, 4AM (local time) - 7.5ft (2.3m), 12s period, WNW swell with offshore winds.
- Most powerful swell: Friday 28 Aug, 4AM (local time) - 7.5ft (2.3m), 12s period, WNW swell with 1,420 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 10PM (local time) - 3ft (0.9m), 6s period with WNW 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 25) at 10PM. The primary swell is predicted to be 0.9m and 6s period with a secondary swell of 0.1m and 10s. 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 2.3m 12s and forecast to arrive on Friday (Aug 28) at 4AM. Winds are predicted to be offshore at the time the swell arrives.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Tue 25th Aug) | 3ft (0.9m) 6s |
| Best Surf | 4AM (Fri 28th Aug) | 7.5ft (2.3m) 12s |
| Most Powerful | 4AM (Fri 28th Aug) | 7.5ft (2.3m) 12s |
Table - best surf conditions forecast for Costa Nova over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's be real, the first chunk of this forecast for Costa Nova is a total bust. We're looking at a long stretch of poor, messy surf right out of the gate. From Tuesday the 25th through Thursday the 27th of August, the wind is junk, and the waves are small and weak. You’re better off doing something else.
The one day that gets the blood pumping is Friday the 28th of August. The morning session is the one to hit. We’ve got a light offshore breeze from the NE, which means the waves will be glassy and clean. The swell is a solid 7ft from the WNW, with a long 11-second period. The energy is pumping (1061), so there’s some serious power. But listen, at that size, this is for experienced surfers only. The afternoon wind swings onshore and kills it, so you’ve got a small window.
Then it’s back to the grind. From the 29th all the way through the first week of September, the wind is a constant problem. It’s mostly cross-shore from the NNW, making everything lumpy and choppy. The swell comes and goes, but the wind just won’t cooperate. It’s a frustrating pattern.
Looking way out to the second week, there’s a couple of interesting but uncertain days. On Monday the 7th of September, the morning shows a big 8ft NW swell with a 12-second period, but the wind is cross-shore again. The next morning, Tuesday the 8th, is the real wildcard. The swell drops to 3ft, but the period is a massive 17 seconds from the west. That’s a long-period groundswell. At a beach break like Costa Nova, that long period might make the waves a bit walled-up and hard to find a good peak. But if the wind stays light, it could be a unique day for the experts. It’s a long way out, so keep an eye on the charts.
Water temp is about 67°, which is normal for this time of year. Nothing to write home about.
Rusty, out.
Short Range ForecastHeavy rain (total 30mm), heaviest during Thu morning. Warm (max 21°C on Tue morning, min 15°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Sun morning, min 16°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | |||||||||||||||
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) | W 7 | W 6 | WNW 6 | SSW 5 | WSW 7 | W 8 | W 8 | W 8 | W 8 | WNW 11 | WNW 10 | NW 9 | NW 8 | NW 8 | NW 8 | NW 8 | NW 10 | NW 9 | NW 9 | NW 9 | NW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 89 | 78 | 51 | 88 | 238 | 432 | 227 | 118 | 228 | 1061 | 678 | 357 | 191 | 135 | 161 | 149 | 361 | 225 | 189 | 492 | 640 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | cross-off | cross-off | on | cross-off | cross | cross-on | off | cross-off | cross-on | cross | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross | cross |
High Tide | 2:49PM2.87m | 3:11AM2.82m | 3:24PM3.01m | 3:44AM2.94m | 3:56PM3.13m | 4:14AM3.04m | 4:27PM3.22m | 4:45AM3.10m | 4:57PM3.26m | 5:14AM3.11m | 5:28PM3.26m | 5:45AM3.09m | 6:00PM3.20m | ||||||||
Low Tide | 8:41PM1.17m | 8:50AM1.14m | 9:16PM1.01m | 9:25AM0.98m | 9:50PM0.88m | 9:59AM0.86m | 10:23PM0.78m | 10:33AM0.78m | 10:57PM0.73m | 11:07AM0.75m | 11:31PM0.73m | 11:43AM0.78m | 00:08AM0.79m | ||||||||
 | |  |  |  |  | |  | |  | |  | | | | | | | | | | |
 | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — |
 | — | 8:19 | — | — | 8:16 | — | — | 8:15 | — | — | 8:14 | — | — | 8:12 | — | — | 8:10 | — | — | 8:08 | — |
mm | — | — | — | 7 | 2 | 9 | 9 | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 21 | 20 | 20 | 19 | 18 | 19 | 19 | 17 | 18 | 18 | 18 | 19 | 19 | 19 | 21 | 21 | 20 | 17 | 17 | 17 |
Feels °C | 21 | 20 | 21 | 16 | 17 | 17 | 15 | 15 | 16 | 16 | 15 | 16 | 17 | 17 | 19 | 21 | 21 | 20 | 15 | 12 | 13 |
Swell 1 Height (m) Direction Period (s) | W 7 | W 6 | WNW 6 | NW 6 | WSW 7 | W 8 | W 8 | SW 6 | W 8 | WNW 11 | WNW 10 | NW 9 | NW 8 | NW 8 | NW 8 | NW 8 | NW 10 | NW 9 | NW 9 | W 18 | SW 16 |
| kJ | 89 | 78 | 51 | 8 | 238 | 432 | 227 | 80 | 228 | 1061 | 678 | 357 | 191 | 135 | 161 | 149 | 361 | 225 | 189 | 6 | 10 |
Swell 2 Height (m) Direction Period (s) | SW 6 | W 10 | NW 10 | NW 9 | NW 6 | — | NW 8 | W 8 | NW 10 | — | — | — | — | — | — | NW 10 | W 12 | SW 11 | S 10 | S 10 | S 9 |
| kJ | 18 | 2 | 4 | 13 | 1 | — | 95 | 118 | 181 | — | — | — | — | — | — | 51 | 3 | 5 | 2 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | NNW 4 | NW 12 | W 9 | SW 12 | SW 12 | — | SW 11 | NW 8 | W 11 | — | — | — | — | — | — | W 13 | — | — | — | S 10 | — |
| kJ | 2 | 5 | 2 | 6 | 5 | — | 5 | 112 | 198 | — | — | — | — | — | — | 3 | — | — | — | 2 | — |
Wind waves Height (m) Direction Period (s) | — | — | S 2 | SSW 5 | — | — | — | SW 6 | — | — | — | — | — | — | — | — | — | N 3 | NNW 5 | NW 9 | NW 9 |
| kJ | — | — | 1 | 88 | — | — | — | 30 | — | — | — | — | — | — | — | — | — | 5 | 42 | 492 | 640 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 5 | 222 | 0 | 222 | 230 | 0 | 222 | 218 | 0 | 0 | 218 | 76 | 63 | 222 | 52 | 32 | 218 | 100 | 76 | 218 | 76 |
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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