
Surf Forecasts:
Prainha surf forecast from 5 Aug 2026:
- Best quality surf: Sunday 9 Aug, 12AM (local time) - 7.5ft (2.3m), 14s period, SSW swell with cross-offshore winds.
- Most powerful swell: Saturday 8 Aug, 6PM (local time) - 8ft (2.5m), 15s period, SSW swell with 2,684 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 9PM (local time) - 3ft (0.9m), 11s period with S swell.
Best Forecast Surf Conditions for Prainha this week:
The surf forecast for Prainha over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 05) at 9PM. The primary swell is predicted to be 0.9m and 11s 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 Prainha in the next 16 days are 2.5m 15s and forecast to arrive on Saturday (Aug 08) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Friday (Aug 07) at 12PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 5th Aug) | 3ft (0.9m) 11s |
| Best Surf | 12AM (Sun 9th Aug) | 7.5ft (2.3m) 14s |
| Most Powerful | 6PM (Sat 8th Aug) | 8ft (2.5m) 15s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, let’s get into it. It’s Rusty here, and I’ve been staring at the charts for our stretch of coast, and honestly, it’s a bit of a mixed bag to start. There’s some solid energy on the way, but we’ve got to wade through a few days of average, onshore slop before the ocean cleans up its act and gives us something proper.
The first few days are looking pretty grim, honestly. Wednesday afternoon (Aug 5th) has a bit of a south pulse at 3ft, but that east wind is going to put a chop on it. It’s surfable if you’re desperate, but it’s nothing to write home about. The combined energy is weak to moderate at 510, so it’s just not doing it for me. Thursday and Friday continue in the same vein – small, short-period east swell at around 2ft to 3ft. The mornings are clean with a light offshore, but the waves are weak and ordinary. It’s the kind of surf you’d paddle out for if you’re just keen for a splash, but there’s no power behind it. The swell energy drops right off into the weekend, bottoming out on Friday afternoon with a tiny 1ft bump and a cross-shore breeze. If you’re thinking of getting wet then, don’t bother. That’s the doldrums.
Then, things start to get interesting. The first real standout of the period is Sunday morning, August 9th, at Prainha (Prainha-3). The south-southwest swell is up to 7ft with a 13-second period, and that’s the long-period groundswell we all live for. What’s even better is the WNW wind at just 3 mph, which is glassy. This is when Prainha comes alive. The combined energy jumps to a strong 1568, and the conditions are set to be clean and powerful. This is, without a doubt, the best surf of the first week. It's still got some size to it, so it’s more for the experienced crew, but if you can handle it, it’s going to be firing.
The surf stays in the 7ft range for the next few days, but the winds get messy again. Sunday afternoon is still good, but a cross-off shore keeps it from being perfect. Monday morning is another chance to score, with glassy conditions and solid 7ft south swell, but the consistency is a bit average. Then the south winds pick up on Tuesday, and the window closes with onshore winds making a mess of things. It’s a frustrating week, with waves on offer but not many clean ones.
Now, looking further out, that long-range potential. The second standout is Monday morning, August 17th. The swell is biggest of the whole run, hitting 8ft. The direction is more east, and the period is a shorter 9 seconds, so it’s a windswell rather than a clean groundswell. However, the wind is a light offshore from the north, and the forecast calls for clean conditions. The energy is massive at 2174, so there’s plenty of punch. At that size, it’s strictly for the experts, but if you’re on it, it could be a wild ride. It’s a promising call, but being that far out, I’d say it’s a “keep your fingers crossed” forecast rather than a guarantee. The days after that, the swell starts to back off, and we return to smaller, less inspiring conditions.
So, there you have it. A slow start, a proper clean window on Sunday morning, and a big, raw swell on the 17th that’s got potential if the winds play nice. It’s a case of picking your moments, for sure.
Rusty.
Short Range ForecastSome drizzle, heaviest during Fri night. Warm (max 35°C on Fri morning, min 21°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 10mm), heaviest on Tue morning. Warm (max 27°C on Sun morning, min 19°C on Tue morning). Wind will be generally light. | |||||||||||||||||||
Wed 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | ||||||||||||||
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) | S 11 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | S 10 | S 12 | SSW 16 | SSW 14 | SSW 13 | SSW 13 | S 12 | S 11 | S 12 | S 14 | SSW 12 | SSW 12 | S 14 |
Wave Graph | ||||||||||||||||||||
233 | 160 | 114 | 92 | 71 | 54 | 41 | 33 | 144 | 2107 | 2137 | 1474 | 1269 | 989 | 1107 | 1277 | 2466 | 1240 | 928 | 2214 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross-off | glassy | cross-off | cross-off | cross | on | cross-on | cross-on | cross-off | glassy | cross-off | on | glassy | cross-on | on | cross-on | cross-on | cross-on |
High Tide | 6:34PM0.73m | 7:29AM0.78m | 7:25PM0.64m | 11:37AM0.79m | 11:13PM0.59m | 12:49PM0.90m | 00:22AM0.65m | 1:38PM0.99m | 00:59AM0.73m | 2:18PM1.05m | 1:28AM0.83m | 2:51PM1.06m | 1:56AM0.92m | |||||||
Low Tide | 2:05AM0.34m | 3:12PM0.43m | 3:27AM0.32m | 4:53PM0.46m | 4:52AM0.26m | 6:20PM0.43m | 6:04AM0.16m | 7:17PM0.40m | 7:02AM0.05m | 7:57PM0.37m | 7:51AM-0.04m | 8:31PM0.35m | ||||||||
— | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | |
5:34 | — | — | 5:34 | — | — | 5:34 | — | — | 5:35 | — | — | 5:35 | — | — | 5:36 | — | — | 5:36 | — | |
mm | — | — | — | — | — | — | — | 1 | — | — | — | — | — | 2 | — | — | 3 | 5 | 2 | 3 |
Temp °C | 31 | 26 | 32 | 33 | 24 | 35 | 28 | 23 | 25 | 25 | 25 | 27 | 23 | 22 | 23 | 22 | 22 | 19 | 18 | 18 |
Feels °C | 29 | 26 | 29 | 32 | 26 | 30 | 26 | 23 | 25 | 24 | 26 | 29 | 23 | 24 | 26 | 23 | 25 | 18 | 17 | 17 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | S 4 | SSW 6 | SSW 16 | SSW 14 | SSW 13 | SSW 13 | S 12 | S 11 | S 12 | S 14 | SSW 12 | SSW 12 | S 14 |
118 | 160 | 114 | 92 | 71 | 54 | 40 | 12 | 48 | 2107 | 2137 | 1474 | 1269 | 989 | 1107 | 1277 | 2466 | 1240 | 928 | 2214 | |
Swell 2 Height (m) Direction Period (s) | S 11 | S 11 | S 10 | S 10 | SSE 13 | SSE 12 | SSE 11 | E 7 | S 12 | SSW 10 | E 6 | E 7 | E 8 | E 8 | S 15 | E 8 | — | E 7 | E 7 | — |
233 | 141 | 96 | 68 | 59 | 48 | 41 | 27 | 144 | 253 | 60 | 44 | 63 | 21 | 112 | 10 | — | 15 | 9 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | S 16 | SSE 15 | SSW 9 | SSW 10 | NNW 3 | S 10 | E 8 | — | SE 15 | E 7 | SE 13 | SE 13 | E 8 | SE 12 | — | — | S 13 | — |
— | — | 5 | 21 | 16 | 19 | 2 | 33 | 41 | — | 8 | 50 | 7 | 7 | 10 | 6 | — | — | 31 | — | |
Wind waves Height (m) Direction Period (s) | E 8 | — | N 2 | — | NW 3 | N 3 | W 4 | — | — | E 4 | ENE 6 | — | — | S 6 | — | — | E 7 | ESE 6 | ESE 6 | E 7 |
159 | — | 1 | — | 2 | 5 | 1 | — | — | 37 | 94 | — | — | 102 | — | — | 60 | 55 | 34 | 8 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 5 | 0 | 0 | 0 | 0 | 0 | 44 | 142 | 7 | 124 | 0 | 0 | 151 | 83 | 0 | 124 | 83 | 162 | 663 | 83 |
Best forecast wave conditions in Rio de Janeiro | ||||||||||||||||||||
Best forecast wave conditions in Brazil | ||||||||||||||||||||
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Information about the Prainha Surf forecast
The above surf forecast table for Prainha provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Prainha can be found by selecting the local surf guide option on the grey menu. Our Prainha 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 (Prainha) 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 Prainha 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.
Prainha is 26 km (16 miles) from the very large city of Nilopolis. If you plan a holiday in Rio de Janeiro, look for hotels and other accommodation in Nilopolis. Nilopolis has rooms for a wide range of budgets as well as cheap car hire and transport links.











