Surf Forecasts:
Prainha surf forecast from 20 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 12PM (local time) - 2.5ft (0.8m), 16s period, SE swell with offshore winds.
- Most powerful swell: Monday 24 Aug, 3PM (local time) - 3.5ft (1.0m), 16s period, SE swell with 486 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 12PM (local time) - 2.5ft (0.8m), 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 Monday (Aug 24) at 12PM. The primary swell is predicted to be 0.8m and 16s period with a secondary swell of 0.6m and 4s. 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 1.0m 16s and forecast to arrive on Monday (Aug 24) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 7s period and expected on Thursday (Aug 27) at 9AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Mon 24th Aug) | 2.5ft (0.8m) 16s |
| Best Surf | 12PM (Wed 26th Aug) | 2.5ft (0.8m) 16s |
| Most Powerful | 3PM (Mon 24th Aug) | 3.5ft (1.0m) 16s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's get into it for Prainha. We're looking at a pretty quiet start to the forecast period, with a bit of a wait before any real action shows up. The water is unusually warm for this time of year, sitting at 69°, which is a solid 4° warmer than normal, so you might be able to get away with a thinner wetsuit.
The first chance for anything decent won't be until Saturday, August 24th, but even then it's only marginal. You'll see small, weak energy from the southeast creeping in, with wave energy still in the moderate range (319). The real standout isn't until Monday, August 26th. The morning starts with a clean 2ft swell from the southeast at a long 16 seconds, and the wind is offshore and light. That's your call to get out there. The build continues into the afternoon, with the swell nudging up to 3ft and the period still holding at 15 seconds, with wave energy jumping nicely to 493—still moderate but the best we'll see. The winds stay light and cross-off, keeping things clean. This is the pick of the period.
After that, it's a frustrating mix of onshore winds and chop. Thursday August 29th morning has a bit of clean 4ft E swell, but there's nothing really consistent or clean after that. The second week into September looks pretty average, with a lot of wind and rain, and the swell is mostly small and weak. The last glimmer of hope is on Friday, September 6th, when we see a return to clean conditions with a 3ft SE swell and a 13-14 second period, with light offshore winds. That's a bit of a long-range tease, so keep an eye on it.
Bottom line: Prainha is a very consistent, exposed spot, but for this 16-day window, it's mostly a waiting game. The best chance you've got is the morning of August 26th. It's an advanced break, so the long period groundswell will wrap in nicely, but it can make the paddle out a bit easier between sets.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sat morning. Warm (max 22°C on Fri afternoon, min 14°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Mon morning. Very mild (max 16°C on Tue afternoon, min 13°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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 | SE 5 | E 7 | E 11 | E 7 | E 8 | SE 11 | SE 10 | SE 10 | SE 10 | SE 13 | SE 14 | SE 15 | SE 16 | SE 14 | SE 14 | SE 13 | SE 13 | SE 16 | SE 15 | SE 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 54 | 4 | 38 | 2 | 23 | 43 | 134 | 100 | 25 | 28 | 104 | 160 | 301 | 486 | 297 | 187 | 140 | 100 | 125 | 258 | 238 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | off | off | cross-off | cross | cross | cross-on | cross | cross-off | cross | cross | cross | cross | glassy | cross-off | glassy | cross-off | off | cross-off | cross-off |
High Tide | 3:35PM0.79m | 8:15PM0.78m | 4:21AM0.59m | 3:08PM0.78m | 9:53PM0.78m | 11:24AM0.96m | 11:16PM0.86m | 12:24PM1.07m | 00:13AM0.98m | 1:05PM1.18m | 00:56AM1.11m | 1:41PM1.28m | 1:33AM1.23m | 2:15PM1.34m | 2:09AM1.33m | ||||||
Low Tide | 12:09PM0.63m | 6:01PM0.74m | 5:01AM0.59m | 1:12PM0.76m | 6:41PM0.65m | 6:06AM0.46m | 7:09PM0.56m | 6:44AM0.34m | 7:33PM0.48m | 7:14AM0.23m | 7:53PM0.42m | 7:40AM0.13m | 8:09PM0.38m | 8:02AM0.05m | 8:20PM0.34m | ||||||
 | |  |  | |  |  |  |  | | |  | | | | | | | | | | |
 | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:33 | — | — |
 | — | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:57 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — |
mm | — | — | — | — | — | — | 1 | — | 3 | — | — | — | 1 | — | — | — | — | — | 1 | — | — |
Temp °C | 20 | 20 | 21 | 21 | 22 | 17 | 16 | 15 | 15 | 15 | 15 | 15 | 14 | 15 | 15 | 15 | 16 | 16 | 16 | 17 | 17 |
Feels °C | 21 | 20 | 22 | 17 | 18 | 14 | 14 | 12 | 13 | 13 | 13 | 11 | 12 | 13 | 13 | 14 | 15 | 16 | 15 | 17 | 18 |
Swell 1 Height (m) Direction Period (s) | E 7 | E 7 | E 7 | E 7 | E 7 | E 8 | SE 11 | SE 10 | SE 5 | SE 5 | SE 13 | SE 14 | SE 15 | SE 16 | SE 14 | SE 14 | SE 13 | SE 13 | SE 16 | SE 15 | SE 14 |
| kJ | 54 | 27 | 38 | 25 | 23 | 43 | 134 | 100 | 10 | 7 | 104 | 160 | 301 | 486 | 297 | 187 | 140 | 100 | 125 | 258 | 238 |
Swell 2 Height (m) Direction Period (s) | E 12 | SE 5 | SE 5 | SE 5 | S 9 | SE 10 | E 8 | ENE 8 | SE 10 | SE 10 | E 7 | E 7 | SE 5 | E 7 | ENE 7 | ENE 5 | ENE 4 | ENE 4 | SE 13 | SSE 12 | — |
| kJ | 3 | 4 | 3 | 1 | 1 | 27 | 32 | 23 | 25 | 28 | 4 | 1 | 17 | 1 | 4 | 2 | 1 | 5 | 79 | 199 | — |
Swell 3 Height (m) Direction Period (s) | S 11 | E 12 | E 12 | E 11 | S 6 | — | — | — | ENE 8 | E 7 | — | — | E 7 | — | NE 5 | E 6 | SE 17 | SE 16 | — | — | — |
| kJ | 2 | 3 | 3 | 2 | 1 | — | — | — | 12 | 4 | — | — | 1 | — | 1 | 1 | 44 | 42 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | SW 3 | SSW 3 | SE 5 | — | — | — | — | — | SE 4 | — | — | — | — | — | — | E 5 | ENE 5 | ENE 6 |
| kJ | — | — | — | 1 | 1 | 31 | — | — | — | — | — | 9 | — | — | — | — | — | — | 25 | 36 | 69 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 236 | 11 | 61 | 61 | 52 | 33 | 133 | 59 | 52 | 182 | 62 | 61 | 28 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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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