
Surf Forecasts:
Costa Nova surf forecast from 9 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 10AM (local time) - 3ft (0.9m), 10s period, WNW swell with glassy winds.
- Most powerful swell: Sunday 16 Aug, 1AM (local time) - 6ft (1.9m), 7s period, NW swell with 342 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 7AM (local time) - 3ft (0.9m), 7s period with W 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 Sunday (Aug 09) at 7AM. The primary swell is predicted to be 0.9m and 7s period with a secondary swell of 0.5m and 11s. 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 1.9m 7s and forecast to arrive on Sunday (Aug 16) at 1AM. Winds are predicted to be glassy at the time the swell arrives.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Sun 9th Aug) | 3ft (0.9m) 7s |
| Best Surf | 10AM (Wed 12th Aug) | 3ft (0.9m) 10s |
| Most Powerful | 1AM (Sun 16th Aug) | 6ft (1.9m) 7s |
Table - best surf conditions forecast for Costa Nova over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s have a proper look at what’s coming down the line for our stretch of coast. The next couple of weeks are a bit of a mixed bag, to be honest. We’ve got waves on offer, but we’re going to have to pick our moments. The mornings are where it’s at, especially when the wind drops out and the ocean cleans right up. The afternoons, well, they’re mostly going to be a write-off with the sea breeze chopping everything up.
We kick things off this Sunday morning the 9th. First light’s looking okay, with a 3ft west swell wrapping in. The air’s glassy, which is always a good start, but the energy is a bit on the weak side (130). It’s surfable, but nothing special. The afternoon’s a total loss though – the wind swings around to the northwest at 12 mph and it just turns into a messy cross-on mess.
Monday the 10th and Tuesday the 11th are pretty average for the early sessions. Small, weak swells around 2ft to 3ft and a light cross-shore breeze that puts a bit of a crinkle on the surface. You’ll get waves, but you’ll be working for them. The afternoons are a write-off again, with a stronger cross-offshore wind ruining any chance of clean faces.
Now, here’s where things start to look up. Wednesday morning the 12th is a proper little window. The wind is dead glassy, the swell is 3ft from the west-northwest, and the period is a solid 10 seconds. The energy is picking up to a moderate 216. It’s not huge, but it’s clean and should have a bit of push to it. This is your best bet for a fun, tidy session in the first part of the week.
Thursday the 13th morning has a similar-sized swell with a good 10-second period, but a light cross-on breeze makes it a bit less appealing than Wednesday. The energy is up to 310, so there’s definitely power out there, but that wind is just enough to knock the shine off. The afternoon is a no-go with that 16 mph cross-on.
Friday the 14th is another morning glory. Glassy conditions return, with a 3ft west-northwest swell at 9 seconds and moderate energy (227). It’s going to be clean and fun, not a classic but a good, honest surf. After lunch, the onshore wind hits again.
The weekend is when we get some size, but the quality drops. Saturday the 15th and Sunday the 16th see waves pushing the 5ft to 6ft mark from the northwest, but the period drops back to a short 7 seconds. There’s plenty of energy (250-320), but it’s going to be a bit lumpy and disorganised with those short-period wind swells. The mornings are crossed-up, and the afternoons are onshore junk. This is getting a bit too big and messy for the beginners, and even for the intermediates it’ll be a battle.
Now for the standout, and it’s a good one. Monday morning the 17th is the pick of the whole period. The swell jumps to 6ft from the north-northwest with a solid 8-second period. The wind is glassy, dead calm. The energy reading is a strong 497 – that’s a proper push of water. This is the biggest, cleanest swell we’ll see in the whole stretch. The waves will have real power, and with that light wind, it should be firing. This is definitely one for the experienced crew; at 6ft, it’s holding some size. Just remember it’s a long-range call, so don’t book the week off work just yet, but keep an eye on it.
After that, the swell backs off a bit. Tuesday the 18th is still a decent 5ft from the north-northwest, but with more wind, it’s not as clean. The rest of the week from the 19th through to the 24th is a slow fade. We’re back to smaller swells, 2ft to 4ft, with a mix of glassy mornings and blown-out afternoons. The energy drops away and, honestly, it looks pretty ordinary. The water temp is about average for this time of year, so you won’t need the thickest rubber.
So, to sum it up: Wednesday morning the 12th is the quiet, clean option. But if you want the real deal of the fortnight, you’re looking at Monday the 17th. That’s your standout. A proper slug of swell and clean conditions – the whole package. Get in the water, eh?
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Sat night, min 18°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 20°C on Wed morning, min 17°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 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) | W 7 | W 7 | W 7 | NW 8 | NW 7 | NW 9 | NW 12 | NW 8 | W 10 | WNW 10 | W 9 | W 9 | W 10 | WNW 10 | WNW 10 | WNW 9 | WNW 9 | NNW 7 | NNW 7 | NW 7 | NW 7 |
Wave Graph | |||||||||||||||||||||
80 | 82 | 62 | 58 | 52 | 65 | 41 | 95 | 94 | 150 | 142 | 142 | 148 | 227 | 210 | 124 | 101 | 243 | 165 | 194 | 342 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross | cross | cross-on | cross | cross-on | cross-on | cross | glassy | cross-on | cross | cross-on | cross-on | cross-on | glassy | cross-on | glassy | cross | on | glassy |
High Tide | 1:25PM2.79m | 2:02AM2.78m | 2:23PM2.99m | 2:56AM2.93m | 3:13PM3.18m | 3:43AM3.06m | 3:58PM3.33m | 4:25AM3.14m | 4:40PM3.40m | 5:05AM3.17m | 5:20PM3.40m | 5:42AM3.13m | 5:58PM3.33m | ||||||||
Low Tide | 6:35AM1.32m | 7:19PM1.19m | 7:43AM1.19m | 8:23PM1.00m | 8:39AM1.04m | 9:15PM0.84m | 9:27AM0.89m | 10:00PM0.72m | 10:10AM0.79m | 10:41PM0.67m | 10:50AM0.74m | 11:20PM0.68m | 11:28AM0.76m | 11:57PM0.76m | |||||||
6:39 | — | — | 6:39 | — | — | 6:39 | — | — | 6:41 | — | — | 6:41 | — | — | 6:43 | — | — | 6:43 | — | — | |
— | 8:40 | — | — | 8:39 | — | — | 8:38 | — | — | 8:37 | — | — | 8:36 | — | — | 8:35 | — | — | 8:32 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 18 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 21 | 19 |
Feels °C | 21 | 19 | 21 | 20 | 19 | 19 | 20 | 18 | 17 | 22 | 20 | 20 | 20 | 17 | 19 | 21 | 18 | 20 | 20 | 21 | 21 |
Swell 1 Height (m) Direction Period (s) | W 7 | W 7 | W 7 | NW 8 | NW 7 | NW 9 | NW 5 | NNW 11 | W 10 | WNW 10 | W 9 | W 9 | NNW 6 | WNW 10 | WNW 10 | NNW 6 | WNW 9 | WNW 8 | NW 8 | — | — |
80 | 82 | 62 | 58 | 52 | 65 | 41 | 44 | 94 | 150 | 142 | 142 | 49 | 227 | 210 | 103 | 101 | 123 | 73 | — | — | |
Swell 2 Height (m) Direction Period (s) | NW 10 | NNW 10 | NNW 9 | W 7 | WSW 6 | W 6 | NW 12 | WNW 11 | NNW 10 | NW 5 | NNW 9 | NNW 9 | W 10 | — | WNW 10 | WNW 9 | — | — | W 8 | W 18 | — |
50 | 64 | 55 | 32 | 14 | 11 | 35 | 40 | 61 | 34 | 32 | 17 | 148 | — | 135 | 124 | — | — | 12 | 6 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | W 12 | W 11 | W 11 | WNW 10 | NW 8 | WNW 9 | — | NNW 9 | — | WNW 13 | WNW 11 | — | — | — | — | — | — | — | — |
— | — | 3 | 2 | 2 | 10 | 17 | 8 | — | 32 | — | 18 | 113 | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | NW 3 | — | — | NW 3 | NNW 4 | — | NW 8 | NW 5 | — | NW 5 | NNW 5 | — | NNW 5 | NNW 6 | — | NNW 6 | NNW 7 | NNW 7 | NW 7 | NW 7 |
— | 2 | — | — | 5 | 11 | — | 95 | 36 | — | 19 | 31 | — | 51 | 181 | — | 96 | 243 | 165 | 194 | 342 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 218 | 52 | 52 | 224 | 81 | 52 | 218 | 76 | 0 | 218 | 32 | 32 | 268 | 52 | 0 | 357 | 0 | 5 | 218 | 0 |
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.











