Surf Forecasts:
Praia das Macas surf forecast from 17 Aug 2026:
- Best quality surf: Monday 17 Aug, 10PM (local time) - 4.5ft (1.3m), 8s period, NNW swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 7PM (local time) - 7ft (2.1m), 8s period, NNW swell with 608 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 10PM (local time) - 4.5ft (1.3m), 8s period with NNW swell.
Best Forecast Surf Conditions for Praia das Macas this week:
The surf forecast for Praia das Macas over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 10PM. The primary swell is predicted to be 1.3m 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 Praia das Macas in the next 16 days are 2.1m 8s 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 0.2m 14s period and expected on Wednesday (Aug 19) at 10AM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Mon 17th Aug) | 4.5ft (1.3m) 8s |
| Best Surf | 10PM (Mon 17th Aug) | 4.5ft (1.3m) 8s |
| Most Powerful | 7PM (Fri 21st Aug) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Praia das Macas over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the menu for Praia das Macas. Right off the bat, I gotta say the first few days are the only real window for a surf here, and even then, it's a pretty narrow one.
The overall pattern shows the biggest opportunity hits first thing Monday morning, the 17th of August. We’ve got a clean 6ft swell rolling in from the NNW with a period of 8 seconds. The combined energy is a moderate 364. The wind is glassy out of the SE, which is offshore for this spot. That's the recipe for the cleanest waves of the whole stretch. The water temp is sitting at 68°, which is about average for this time of year and feels fine. This is the standout, hands down. The waves will be manageable for the beginner crowd this break is known for, but keep in mind that crowds are sometimes an issue here, so get out early.
Shifting to Tuesday morning, the 18th, the swell holds at 5ft from the NNW, but the wind swings to a cross-offshore from the S. It's still clean, but not as perfect as Monday morning. The energy stays moderate (301). After that, things fall apart quickly. From Tuesday afternoon all the way through to the 28th of August, the wind turns onshore or cross-onshore nearly every session, chopping up what surf there is. The swell fluctuates between 2ft and 7ft, but with that nasty wind, it’s all blown out and messy.
There’s a long stretch of nothing worth paddling out for. Late in the window, on Saturday the 29th of August, a much bigger, long-period groundswell tries to push through. The morning shows a 8ft swell from the NW with a 10-second period, and the combined energy jumps to a very strong 2260. But the wind is cross-shore from the N at 16 mph, and it’s only rated as marginal. That's a big, powerful swell, over 8ft, and with that onshore wind, this is strictly for the experts and even then you’ll be fighting a cross-chop. The afternoon gets even bigger, with a 10ft swell and a 14-second period, energy through the roof at 3892, but the wind is up to 22 mph from the north and onshore. For paddle surfing, this setup looks more interesting for the kite surfers than anyone on a shortboard.
So to wrap it up, your best bet is Monday morning (17th of August) for the glassy, clean conditions. After that, it’s a long run of poor surf until the end of the month, when it gets too big and windy for most. Forecasts can change, but as it stands, aim for that Monday session.
Rusty.
Short Range ForecastSome drizzle, heaviest during Mon night. Warm (max 25°C on Mon morning, min 20°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Thu morning, min 19°C on Thu night). Winds decreasing (fresh winds from the NNW on Thu night, light winds from the NNW by Sat night). | ||||||||||||||||||||
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 8 | NNW 7 | NNW 7 | WNW 9 | WNW 9 | NW 8 | NW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 9 | NNW 8 | NNW 8 | NNW 8 | NNW 8 |
Wave Graph | |||||||||||||||||||||
344 | 284 | 202 | 284 | 250 | 168 | 99 | 117 | 50 | 45 | 44 | 171 | 530 | 593 | 451 | 403 | 463 | 336 | 328 | 270 | 300 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | cross-on | cross-off | cross-on | cross | cross | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 6:32PM2.65m | 6:54AM2.45m | 7:13PM2.39m | 7:37AM2.27m | 8:01PM2.14m | 8:29AM2.10m | 9:05PM1.94m | 9:44AM1.98m | 10:36PM1.85m | 11:16AM1.99m | 00:04AM1.90m | 12:30PM2.12m | 1:04AM2.05m | ||||||||
Low Tide | 12:15PM0.37m | 00:40AM0.45m | 12:56PM0.58m | 1:18AM0.68m | 1:42PM0.79m | 2:03AM0.90m | 2:42PM0.98m | 3:06AM1.07m | 4:10PM1.09m | 4:41AM1.14m | 5:49PM1.05m | 6:08AM1.05m | 6:56PM0.90m | ||||||||
6:52 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — | |
— | 8:30 | — | — | 8:29 | — | — | 8:28 | — | — | 8:25 | — | — | 8:24 | — | — | 8:22 | — | — | 8:22 | — | |
mm | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — |
Temp °C | 25 | 23 | 21 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 19 | 20 | 20 | 19 | 19 | 19 | 20 |
Feels °C | 26 | 23 | 23 | 23 | 22 | 23 | 22 | 22 | 22 | 20 | 16 | 15 | 16 | 16 | 15 | 17 | 17 | 16 | 17 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 6 | WNW 9 | NNW 12 | NW 11 | WNW 9 | W 10 | W 9 | W 9 | WNW 8 | WNW 8 | WNW 9 | W 8 |
344 | 284 | 202 | 284 | 250 | 168 | 99 | 117 | 50 | 29 | 44 | 99 | 126 | 26 | 50 | 39 | 39 | 24 | 24 | 15 | 6 | |
Swell 2 Height (m) Direction Period (s) | SW 15 | W 9 | W 8 | W 8 | SW 16 | WNW 8 | SSW 14 | WNW 10 | WNW 9 | WNW 9 | NW 11 | NW 9 | SSW 15 | W 11 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | W 6 |
8 | 6 | 5 | 10 | 38 | 13 | 20 | 21 | 50 | 45 | 31 | 26 | 21 | 21 | 18 | 20 | 20 | 19 | 18 | 17 | 3 | |
Swell 3 Height (m) Direction Period (s) | SW 18 | SW 14 | SSW 16 | SW 14 | W 8 | SSW 15 | WNW 8 | WNW 8 | SSW 13 | SSW 13 | SSW 13 | SSW 15 | W 12 | SSW 14 | NNW 12 | — | — | SSW 14 | — | — | SW 13 |
12 | 8 | 26 | 7 | 10 | 21 | 12 | 6 | 17 | 17 | 17 | 21 | 11 | 21 | 14 | — | — | 19 | — | — | 7 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | NNW 6 | NW 8 | NW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 9 | NNW 8 | NNW 8 | NNW 8 | NNW 8 |
— | — | — | — | — | — | — | — | — | — | 27 | 171 | 530 | 593 | 451 | 403 | 463 | 336 | 328 | 270 | 300 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 58 | 11 | 0 | 426 | 18 | 1 | 127 | 14 | 15 | 573 | 21 | 205 | 569 | 115 | 204 | 206 | 15 | 16 | 22 | 177 |
Best forecast wave conditions in Lisboa | |||||||||||||||||||||
Best forecast wave conditions in Portugal | |||||||||||||||||||||
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Information about the Praia das Macas Surf forecast
The above surf forecast table for Praia das Macas provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Praia das Macas can be found by selecting the local surf guide option on the grey menu. Our Praia das Macas 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 (Praia das Macas) 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 Praia das Macas 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.
Praia das Macas is 9 km (6 miles) from Sintra. If you plan a holiday in Lisboa, look for hotels and other accommodation in Sintra. Sintra has rooms for a wide range of budgets as well as car hire and transport links.











