Surf Forecasts:
Prainha surf forecast from 11 Aug 2026:
- Best quality surf: Thursday 13 Aug, 3AM (local time) - 2ft (0.6m), 16s period, SE swell with offshore winds.
- Most powerful swell: Monday 17 Aug, 6PM (local time) - 4.5ft (1.3m), 9s period, E swell with 276 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 9PM (local time) - 2.5ft (0.7m), 12s 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 Tuesday (Aug 11) at 9PM. The primary swell is predicted to be 0.7m and 12s period with a secondary swell of 0.2m 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 1.3m 9s and forecast to arrive on Monday (Aug 17) 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 0.5m 5s period and expected on Thursday (Aug 13) at 3AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Tue 11th Aug) | 2.5ft (0.7m) 12s |
| Best Surf | 3AM (Thu 13th Aug) | 2ft (0.6m) 16s |
| Most Powerful | 6PM (Mon 17th Aug) | 4.5ft (1.3m) 9s |
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. The next couple of weeks are looking like a mixed bag, with some real windows of opportunity if you're patient. The water is sitting at 68°, which is a touch warmer than normal for this time of year, so you might not need the thickest rubber.
We start off small on Tuesday the 11th with a clean 2ft SE swell, but it's only crossing up at 6 mph. Not a write-off, but nothing to get excited about. Wednesday the 12th morning is the first real highlight. We’ve got the same 2ft groundswell from the SE (13-second period) going glassy with a 3 mph NNW breeze. That’s going to be clean as a whistle. The combined swell energy is moderate (149), so there's a bit of push behind it. This is your best bet early on, but be aware it can get a little inconsistent.
Thursday the 13th morning is another clean window with a 2ft SE swell (16-second period) and a light offshore cross-off breeze. That long period means the waves will have some real shape, but at this size, it's mostly for the longboard or a fun mid-length.
The weekend gets a bit messy with shorter period windswell and onshore breezes, so I'd be giving Saturday the 15th and Sunday the 16th a miss.
Monday the 17th morning is a standout. We get a jump in size to a 4ft E swell, and it’s glassy. The combined energy is moderate-strong (214), and with those clean conditions, this is the pick of the first week. The swell is a bit short in period at 8 seconds, so it won't have the grunt of a groundswell, but for a fun, punchy beach break, it’ll do the job.
The following week is pretty average until we get to Wednesday the 26th morning. That’s another serious highlight. The swell bumps up to 4ft from the SE, but the combined energy is strong at 299, and it’s glassy with a 3 mph SW. Then Wednesday afternoon the energy really cranks up to 682 with a 6ft SSE swell. That’s getting into expert-only territory at 6ft with strong energy, and the wind goes onshore, so it’s likely going to be a messy, powerful wall of water – best left to the experienced crew in the know.
Overall, the standout sessions are Wednesday the 12th morning for the clean, glassy long-period groundswell, and Monday the 17th morning for the biggest clean window of the first week. The call on the 26th morning looks promising but it’s a long way out, so keep an eye on it.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Tue afternoon. Very mild (max 18°C on Thu morning, min 12°C on Tue afternoon). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 27mm), heaviest during Fri night. Warm (max 20°C on Sat afternoon, min 18°C on Fri afternoon). Wind will be generally light. | |||||||||||||||||||
Tue 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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 13 | SE 12 | SE 12 | SE 12 | SE 13 | SE 16 | SE 15 | SE 13 | SE 13 | SE 14 | SE 13 | SE 8 | ESE 8 | ESE 7 | ESE 7 | E 8 | E 8 | E 8 | E 9 | E 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 156 | 148 | 148 | 144 | 100 | 196 | 212 | 109 | 58 | 130 | 113 | 77 | 85 | 89 | 91 | 124 | 200 | 201 | 270 | 234 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | glassy | cross-on | cross-off | cross-off | cross | glassy | cross-off | glassy | cross-on | cross | cross-on | on | cross-on | cross | glassy | glassy | on | cross-on |
High Tide | 2:16AM1.22m | 3:08PM1.36m | 2:52AM1.29m | 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 | ||||||||
Low Tide | 9:12PM0.47m | 8:37AM0.01m | 8:59PM0.49m | 8:52AM-0.00m | 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 | |||||||
 |  |  |  |  |  | | | | |  | |  | | | | | | |  | |
 | — | — | 6:45 | — | — | 6:43 | — | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — |
 | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — |
mm | 4 | 1 | — | — | — | — | — | 1 | 3 | 2 | 20 | 4 | 1 | — | — | — | — | — | — | — |
Temp °C | 13 | 13 | 15 | 17 | 17 | 18 | 17 | 17 | 18 | 18 | 19 | 19 | 20 | 19 | 19 | 20 | 20 | 20 | 20 | 20 |
Feels °C | 12 | 12 | 15 | 17 | 18 | 15 | 15 | 17 | 19 | 20 | 19 | 20 | 21 | 19 | 20 | 21 | 22 | 22 | 21 | 22 |
Swell 1 Height (m) Direction Period (s) | SE 13 | SE 12 | SE 12 | SE 12 | SE 13 | SE 16 | SE 15 | SE 13 | SE 13 | SE 8 | SE 7 | SE 8 | ESE 8 | ESE 7 | ESE 7 | E 8 | E 8 | E 8 | E 9 | E 9 |
| kJ | 156 | 148 | 148 | 144 | 100 | 196 | 212 | 109 | 58 | 41 | 43 | 77 | 85 | 89 | 91 | 124 | 200 | 201 | 270 | 234 |
Swell 2 Height (m) Direction Period (s) | E 8 | E 8 | E 7 | E 7 | ENE 4 | E 5 | E 6 | E 6 | SE 9 | SE 14 | SE 13 | SE 12 | SE 12 | SE 11 | E 13 | E 13 | E 13 | SE 13 | SSE 10 | SSE 10 |
| kJ | 5 | 4 | 1 | 1 | 6 | 13 | 23 | 19 | 20 | 130 | 113 | 53 | 35 | 19 | 13 | 3 | 3 | 7 | 20 | 10 |
Swell 3 Height (m) Direction Period (s) | — | E 8 | — | — | E 7 | — | — | — | ENE 6 | ENE 6 | ENE 6 | E 7 | E 10 | E 13 | E 12 | E 13 | E 13 | SE 13 | — | — |
| kJ | — | 4 | — | — | 1 | — | — | — | 13 | 13 | 7 | 10 | 2 | 3 | 12 | 12 | 3 | 6 | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | ENE 4 | — | SSE 3 | — | — | — | — | — | ENE 6 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 13 | — | 3 | — | — | — | — | — | 7 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 33 | 0 | 0 | 121 | 0 | 0 | 0 | 4 | 4 | 54 | 28 | 4 | 121 | 0 | 0 | 73 | 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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