Surf Forecasts:
Prainha surf forecast from 27 Aug 2026:
- Best quality surf: Thursday 27 Aug, 3AM (local time) - 3.5ft (1.0m), 15s period, SE swell with glassy winds.
- Most powerful swell: Thursday 27 Aug, 3AM (local time) - 3.5ft (1.0m), 15s period, SE swell with 421 kJ wave energy.
- Next surfable swell (1★+): Thursday 27 Aug, 3AM (local time) - 3.5ft (1.0m), 15s 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 27) at 3AM. The primary swell is predicted to be 1.0m and 15s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Prainha in the next 16 days are 1.0m 15s and forecast to arrive on Thursday (Aug 27) at 3AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 8s period and expected on Friday (Aug 28) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 27th Aug) | 3.5ft (1.0m) 15s |
| Best Surf | 3AM (Thu 27th Aug) | 3.5ft (1.0m) 15s |
| Most Powerful | 3AM (Thu 27th Aug) | 3.5ft (1.0m) 15s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, folks, Rusty here with the forecast for the next couple of weeks. It’s going to be a slow start, but there’s some light at the end of the tunnel.
The water at Prainha is about what you’d expect for this time of year, no major surprises there.
We’re looking at a long, quiet stretch from now through the end of August and into early September. Most days are showing poor surf with onshore or cross-shore winds, and the swell energy is weak, often under 200 (mostly 100-160). It’s a lot of waiting around.
Things finally get going on Tuesday morning, September 1st. A moderate offshore wind from the southwest at 15 mph will clean up a 0.9m swell from the southeast. The energy is moderate (200). The swell is from the southeast, which is close to the optimum south, so it’ll wrap in well. It’s not huge, but for a consistent spot, it’s a good session.
The real standout is Tuesday morning, September 8th. This one has more power. A 1.5m easterly swell with a 9-second period, and the energy is strong (343). The wind is glassy from the west at 3 mph, so it’ll be clean. That’s a proper session for advanced surfers—anything over 1.5m starts to get a bit much for beginners. The east direction is a bit off the optimum south, but with that much energy and glassy conditions, it’s the best of the two weeks.
Finally, on Friday morning, September 11th, there’s another promising window. A 0.6m southeast swell with a long period of 13 seconds (groundswell) and strong energy (320). The wind is light offshore from the west-southwest, so it’ll be clean. The long period might make it a bit racy, but it should still offer some good waves.
The rest of the days are mostly blown out by onshore winds or marginal conditions. The 9th of September is a washout with strong southerly winds.
So, for the best bet: the glassy morning of the 8th of September is the standout, with that 1.5m east swell and clean conditions. The 1st of September is a solid second option, and the 11th of September is a long-range promise that could be a sneaky good one.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Sat morning, min 18°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 16mm), heaviest on Mon night. Warm (max 22°C on Tue morning, min 18°C on Tue afternoon). Wind will be generally light. | ||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | ||||||||||||||
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 15 | SE 14 | SE 14 | SE 13 | E 7 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 9 | E 9 | E 9 | SE 9 | SE 9 | SE 9 | SE 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 438 | 293 | 179 | 106 | 103 | 138 | 177 | 157 | 161 | 138 | 86 | 84 | 123 | 123 | 93 | 76 | 120 | 168 | 138 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | on | cross-on | glassy | cross-on | cross-on | glassy | cross | cross-off | glassy | cross | glassy | cross | cross-off | cross | off | cross-on | cross-on |
High Tide | 2:09AM1.33m | 2:48PM1.38m | 2:43AM1.39m | 3:22PM1.39m | 3:19AM1.41m | 3:55PM1.35m | 3:56AM1.39m | 4:30PM1.28m | 4:35AM1.33m | 5:07PM1.17m | 5:20AM1.23m | 5:47PM1.03m | |||||||
Low Tide | 8:21AM0.00m | 8:29PM0.31m | 8:40AM-0.03m | 8:43PM0.27m | 9:01AM-0.02m | 9:03PM0.24m | 9:26AM0.02m | 9:28PM0.22m | 9:54AM0.11m | 9:57PM0.22m | 10:24AM0.23m | 10:29PM0.25m | |||||||
 |  | | |  | | | | | |  | |  |  | |  | | | | |
 | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:28 | — | — | 6:26 | — | — |
 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 3 | 11 | — | — | — |
Temp °C | 19 | 19 | 20 | 20 | 20 | 20 | 21 | 23 | 21 | 19 | 19 | 20 | 19 | 20 | 20 | 20 | 22 | 19 | 18 |
Feels °C | 20 | 21 | 20 | 20 | 20 | 20 | 20 | 24 | 20 | 17 | 21 | 20 | 22 | 21 | 22 | 21 | 18 | 16 | 17 |
Swell 1 Height (m) Direction Period (s) | SE 15 | SE 14 | SE 14 | E 7 | E 7 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 9 | E 9 | E 9 | SE 9 | SE 9 | E 9 | SE 9 |
| kJ | 438 | 293 | 179 | 89 | 103 | 138 | 177 | 157 | 161 | 138 | 86 | 84 | 123 | 123 | 93 | 76 | 120 | 81 | 138 |
Swell 2 Height (m) Direction Period (s) | ENE 5 | E 6 | — | SE 13 | SE 12 | SE 12 | SSE 11 | SE 10 | SE 10 | SE 10 | SSE 5 | SE 10 | SE 5 | SE 7 | SE 7 | E 8 | E 9 | — | E 10 |
| kJ | 7 | 23 | — | 106 | 51 | 21 | 11 | 4 | 4 | 4 | 10 | 4 | 6 | 13 | 26 | 68 | 80 | — | 90 |
Swell 3 Height (m) Direction Period (s) | E 7 | — | — | — | — | — | — | — | — | — | SE 10 | — | S 9 | — | — | — | — | — | SE 10 |
| kJ | 1 | — | — | — | — | — | — | — | — | — | 4 | — | 2 | — | — | — | — | — | 25 |
Wind waves Height (m) Direction Period (s) | — | — | E 6 | ENE 7 | — | ENE 8 | — | — | SE 3 | SSE 6 | SSE 5 | SE 5 | — | — | — | — | SW 2 | SE 9 | — |
| kJ | — | — | 46 | 204 | — | 240 | — | — | 5 | 46 | 39 | 6 | — | — | — | — | 1 | 168 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 4 | 249 | 4 | 0 | 73 | 4 | 0 | 79 | 28 | 0 | 129 | 0 | 4 | 0 | 28 | 0 | 129 | 52 |
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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