Surf Forecasts:
Prainha surf forecast from 13 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 9PM (local time) - 6ft (1.8m), 7s period, SSE swell with glassy winds.
- Most powerful swell: Tuesday 18 Aug, 9PM (local time) - 6ft (1.8m), 7s period, SSE swell with 302 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 9AM (local time) - 2.5ft (0.7m), 16s period with SE 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 Thursday (Aug 13) at 9AM. The primary swell is predicted to be 0.7m and 16s period. 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 1.8m 7s and forecast to arrive on Tuesday (Aug 18) at 9PM. 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 7s period and expected on Sunday (Aug 16) at 9AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Thu 13th Aug) | 2.5ft (0.7m) 16s |
| Best Surf | 9PM (Tue 18th Aug) | 6ft (1.8m) 7s |
| Most Powerful | 9PM (Tue 18th Aug) | 6ft (1.8m) 7s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, Rusty here. Let's look at this one, Prainha.
We've got a bit of a slow start ahead, but there’s some light at the end of the tunnel. The water temp is sitting at 68°, which is a touch warmer than normal for this time of year, so you can get away with a thinner wetsuit or maybe even just a rash vest.
The first real window looks to be Thursday morning, August 13th. We're looking at a 2ft swell out of the southeast with a very long 16-second period. That kind of period means proper groundswell energy, giving you long, lined-up waves, but it can run a bit straight on a beach break like this. Still, with a light cross-off wind and clean conditions (combined energy of 240), it’s the best we've got early on. This one's for the advanced crew though, as the break holds that label.
Things go flat and ordinary after that for a good stretch. It’s a few days of small, weak surf with a lot of onshore wind and poor conditions. There’s really nothing worth paddling out for from Thursday afternoon all the way through to the middle of the following week.
The next flicker of life comes on Tuesday morning, August 18th. Glassy conditions and a 4ft swell from the east with a 9-second period. The combined energy is moderate (250), and with that glassy wind, it’ll be clean. Again, Prainha is advanced and exposed, so it’s not a spot for learners.
The real standout, if you’ve got the patience, is Tuesday, August 25th. The morning shows a solid 6ft southeast swell with a short 8-second period, and combined energy is strong at 390. It’s clean with a cross-off breeze. The swell is pushing into the 5ft range, so it’s getting a bit too much for beginners, but for the experienced surfer, this is going to be the best day on offer. Good, solid waves rolling in, and the wind is right.
Thursday morning, August 27th also looks promising as a call. Glassy conditions, 3ft of southeast swell with a very long 14-second period, and the energy is high at 357. That’ll be a clean, long-period groundswell, which can make for beautiful walls if you can find the right take-off zone.
Overall, it’s a patchy outlook. A lot of dud days, but if you pick your windows right—specifically the 25th of August—you’ll score.
Rusty out.
Short Range ForecastHeavy rain (total 36mm), heaviest during Fri night. Very mild (max 19°C on Sat morning, min 16°C on Thu morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 23°C on Tue morning, min 18°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | SE 16 | SE 15 | SE 13 | SE 13 | SE 14 | SE 13 | ESE 8 | E 8 | E 7 | ESE 8 | E 8 | E 8 | E 9 | E 9 | E 9 | E 9 | E 9 | SSE 7 | E 8 | E 8 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 239 | 212 | 109 | 61 | 125 | 111 | 100 | 168 | 155 | 76 | 177 | 230 | 247 | 268 | 224 | 225 | 155 | 187 | 66 | 64 | 42 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | glassy | cross-on | glassy | cross-on | cross-on | on | on | on | on | cross-on | on | on | glassy | cross | cross-off | cross-off | on | cross-on |
High Tide | 3:42PM1.32m | 3:27AM1.33m | 4:14PM1.26m | 4:02AM1.33m | 4:44PM1.18m | 4:38AM1.28m | 5:12PM1.10m | 5:17AM1.19m | 5:41PM1.02m | 6:01AM1.08m | 6:13PM0.94m | 6:57AM0.97m | 6:56PM0.85m | ||||||||
Low Tide | 8:49PM0.45m | 9:11AM0.02m | 9:04PM0.38m | 9:33AM0.07m | 9:28PM0.32m | 9:59AM0.15m | 9:59PM0.28m | 10:27AM0.25m | 10:32PM0.27m | 10:56AM0.37m | 11:08PM0.31m | 11:29AM0.50m | 11:50PM0.37m | ||||||||
 | |  |  |  |  | |  |  | | | | |  |  | | |  | | | | |
 | 6:43 | — | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — |
 | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — |
mm | 1 | 6 | 4 | — | 1 | 20 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 17 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 23 | 20 | 19 | 18 | 18 | 18 |
Feels °C | 17 | 17 | 18 | 20 | 19 | 20 | 18 | 18 | 18 | 19 | 20 | 20 | 22 | 21 | 21 | 25 | 19 | 21 | 20 | 19 | 19 |
Swell 1 Height (m) Direction Period (s) | SE 16 | SE 15 | SE 13 | SE 13 | SE 14 | SE 8 | ESE 8 | E 8 | E 7 | ENE 7 | E 8 | E 8 | E 9 | E 9 | E 9 | E 9 | E 9 | SE 6 | E 8 | E 8 | E 8 |
| kJ | 239 | 212 | 109 | 61 | 125 | 73 | 100 | 168 | 155 | 82 | 177 | 230 | 247 | 268 | 224 | 225 | 155 | 59 | 66 | 64 | 42 |
Swell 2 Height (m) Direction Period (s) | ENE 5 | ENE 5 | E 5 | SE 8 | SE 8 | SE 13 | SE 12 | SE 12 | SE 11 | ESE 8 | E 13 | E 13 | SSE 10 | SSE 10 | SSE 10 | — | — | E 9 | SE 6 | SE 6 | SE 7 |
| kJ | 7 | 9 | 8 | 24 | 39 | 111 | 52 | 35 | 19 | 76 | 3 | 3 | 39 | 19 | 10 | — | — | 99 | 16 | 25 | 22 |
Swell 3 Height (m) Direction Period (s) | E 7 | — | — | ENE 6 | ENE 6 | ENE 6 | E 8 | — | — | E 13 | E 13 | E 14 | SE 13 | SE 12 | — | — | — | — | SE 7 | E 14 | SE 13 |
| kJ | 1 | — | — | 6 | 6 | 3 | 13 | — | — | 12 | 13 | 4 | 6 | 6 | — | — | — | — | 35 | 4 | 7 |
Wind waves Height (m) Direction Period (s) | — | — | SSE 3 | S 3 | — | — | — | — | — | NE 7 | — | — | — | — | — | SSE 4 | SE 6 | SSE 7 | — | — | — |
| kJ | — | — | 1 | 1 | — | — | — | — | — | 116 | — | — | — | — | — | 25 | 44 | 187 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 80 | 0 | 0 | 33 | 0 | 54 | 40 | 73 | 73 | 73 | 40 | 4 | 73 | 28 | 0 | 121 | 0 | 0 | 96 | 4 |
Best forecast wave conditions in Santa Catarina - Norte | |||||||||||||||||||||
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 14 km (9 miles) from Sao Francisco do Sul. If you plan a holiday in Santa Catarina - Norte, look for hotels and other accommodation in Sao Francisco do Sul. Sao Francisco do Sul has rooms for a wide range of budgets as well as car hire and transport links.
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