Surf Forecasts:
Prainha surf forecast from 4 Aug 2026:
- Best quality surf: Sunday 9 Aug, 12AM (local time) - 6ft (1.9m), 14s period, SSW swell with glassy winds.
- Most powerful swell: Sunday 9 Aug, 12AM (local time) - 6ft (1.9m), 14s period, SSW swell with 1,325 kJ wave energy.
- Next surfable swell (1★+): Tuesday 4 Aug, 12PM (local time) - 4ft (1.2m), 7s period with E 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 Tuesday (Aug 04) at 12PM. The primary swell is predicted to be 1.2m and 7s period with a secondary swell of 0.9m and 7s. Another secondary swell of 0.4m and 10s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Prainha in the next 16 days are 1.9m 14s and forecast to arrive on Sunday (Aug 09) at 12AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Sunday (Aug 09) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Tue 4th Aug) | 4ft (1.2m) 7s |
| Best Surf | 12AM (Sun 9th Aug) | 6ft (1.9m) 14s |
| Most Powerful | 12AM (Sun 9th Aug) | 6ft (1.9m) 14s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let's have a look at what Prainha has on offer for us.
We've got a bit of a slow start, but the good news is this spot is very consistent, so it won't stay flat for long. The first session worth paddling out for is on Tuesday morning, the 4th of August. We're looking at clean, cross-off conditions with a light breeze, and a small 4ft easterly swell rolling in. The water is a touch warmer than usual for this time of year, sitting at 73°. The wave energy is moderate (329), so it's not a powerhouse, but it'll be a fun, clean little wave for a beginner session.
The real standouts in this outlook are the sessions on the 9th and 10th. Sunday morning, the 9th, we're looking at clean, cross-off winds from the west with a solid 6ft groundswell out of the SSW. The period is a nice 13 seconds, which means real energy in the water (1313). That's a good, strong, moderate energy. Then Monday morning, the 10th, is also looking prime with a clean 6ft swell from the S, with a 12-second period and good energy (1032). Both of these mornings are going to be the pick of the week. The swell is getting up a bit, but it's still in the fun zone for most surfers, not too big.
Now, for the more experienced crew, keep an eye on the morning of the 19th of August. That's a long way out, so don't book the day off yet, but the models are showing a glassy 7ft SSW swell with a 12-second period. The energy is strong (1259). The afternoon of that same day, however, the swell jumps to 10ft, which is too big for this break and only for experts. Something to watch as it gets closer.
The second week has a few more clean mornings, like the 14th and 15th, with 5ft to 6ft of S swell, but it's a mixed bag of wind and conditions. The 17th morning has a little 4ft glassy wave, but it's nothing to write home about.
Overall, the first ten days have the best windows. The gap between some of the smaller, poorer afternoons and the next good morning is usually just a day or so, so you won't be waiting long. The setup is a beach and reef, so it can handle a bit of swell, but when it's over 8ft it's just for the brave.
Stay salty,
Rusty
Short Range ForecastMostly dry. Warm (max 33°C on Thu afternoon, min 21°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 38°C on Fri afternoon, min 21°C on Sun afternoon). Wind will be generally light. | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
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) | E 7 | S 13 | S 12 | S 12 | S 11 | E 8 | E 7 | E 7 | E 7 | E 8 | E 8 | E 8 | E 8 | SSW 14 | SSW 14 | SSW 13 | SSW 12 | S 12 | S 12 | S 9 | S 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 124 | 91 | 243 | 276 | 233 | 141 | 108 | 156 | 104 | 92 | 55 | 55 | 28 | 742 | 1325 | 1025 | 905 | 657 | 879 | 606 | 811 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-off | cross-off | cross-on | cross-off | cross-off | cross-on | cross-off | cross-off | off | cross-on | cross-off | on | glassy | cross-off | cross | cross-off | cross-off | cross | on |
High Tide | 5:55PM0.82m | 6:15AM0.87m | 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 | ||||||||
Low Tide | 12:42PM0.23m | 00:58AM0.32m | 1:47PM0.34m | 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 | ||||||||
 | |  |  | |  | | | | | | | | | | | |  | | | | |
 | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — |
 | — | 5:32 | — | — | 5:34 | — | — | 5:34 | — | — | 5:34 | — | — | 5:35 | — | — | 5:35 | — | — | 5:36 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 23 | 30 | 31 | 27 | 32 | 33 | 28 | 35 | 38 | 27 | 30 | 26 | 27 | 25 | 25 | 21 | 23 | 23 | 22 |
Feels °C | 26 | 25 | 24 | 29 | 29 | 27 | 30 | 31 | 27 | 30 | 34 | 27 | 31 | 27 | 28 | 26 | 27 | 23 | 25 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | ESE 7 | S 13 | ESE 6 | E 8 | E 8 | E 8 | E 7 | E 7 | E 7 | E 8 | E 8 | E 8 | SSW 6 | SSW 14 | SSW 14 | SSW 13 | SSW 12 | S 12 | S 12 | S 9 | S 11 |
| kJ | 82 | 87 | 54 | 138 | 142 | 135 | 108 | 88 | 104 | 92 | 55 | 55 | 25 | 742 | 1325 | 1025 | 905 | 657 | 879 | 606 | 811 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | S 12 | S 12 | S 11 | S 11 | S 10 | S 10 | SSE 13 | SSE 12 | SSE 11 | S 4 | E 8 | SW 5 | E 6 | E 8 | E 8 | E 8 | S 14 | E 8 | E 8 |
| kJ | 68 | 36 | 243 | 276 | 233 | 141 | 98 | 68 | 59 | 48 | 41 | 19 | 28 | 4 | 52 | 105 | 68 | 47 | 131 | 12 | 10 |
Swell 3 Height (m) Direction Period (s) | S 13 | SW 6 | SE 11 | — | — | — | S 16 | SSE 15 | SSE 9 | SSW 10 | SSW 10 | S 10 | S 10 | — | SE 15 | S 16 | SE 13 | E 13 | E 8 | SE 12 | E 12 |
| kJ | 55 | 1 | 40 | — | — | — | 5 | 21 | 17 | 19 | 9 | 33 | 17 | — | 8 | 183 | 7 | 3 | 22 | 6 | 3 |
Wind waves Height (m) Direction Period (s) | E 7 | ESE 7 | E 6 | — | — | — | N 3 | E 7 | — | N 3 | WNW 10 | — | E 4 | ESE 4 | — | — | — | SW 5 | — | — | — |
| kJ | 124 | 91 | 77 | — | — | — | 1 | 156 | — | 5 | 64 | — | 19 | 27 | — | — | — | 74 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 7 | 0 | 0 | 3 | 0 | 0 | 3 | 0 | 2 | 0 | 5 | 0 | 7 | 0 | 0 | 76 | 0 | 0 | 85 | 3 |
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.
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