Surf Forecasts:
Prainha surf forecast from 12 Sep 2026:
- Best quality surf: Monday 14 Sep, 9PM (local time) - 7ft (2.1m), 8s period, E swell with offshore winds.
- Most powerful swell: Tuesday 15 Sep, 12AM (local time) - 7ft (2.2m), 8s period, ESE swell with 630 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 9PM (local time) - 7ft (2.1m), 8s 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 Monday (Sep 14) at 9PM. The primary swell is predicted to be 2.1m and 8s period with a secondary swell of 1.4m and 8s. Another secondary swell of 0.1m and 11s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Prainha in the next 16 days are 2.2m 8s and forecast to arrive on Tuesday (Sep 15) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 8s period and expected on Saturday (Sep 12) at 3PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 14th Sep) | 7ft (2.1m) 8s |
| Best Surf | 9PM (Mon 14th Sep) | 7ft (2.1m) 8s |
| Most Powerful | 12AM (Tue 15th Sep) | 7ft (2.2m) 8s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s coming up for Prainha. It’s a bit of a slow start, so don’t rush to wax up just yet.
Right now, we’re looking at a long quiet spell. From Saturday the 12th right through to Monday the 14th, it’s pretty much a write-off. Small, weak, choppy – nothing worth paddling out for. The water temp is sitting around 67°, which is pretty normal for this time of year, so no surprises there.
Tuesday the 15th morning is where things start to perk up a little. The swell is coming from the ESE at about 4ft with a period around 8 seconds, and the wind is light and cross-off from the SSW. That combo is giving us clean waves and a combined energy reading of (249). It’s not huge, but it’s clean and surfable. The afternoon gets a bit onshore and messy though, so get it while it’s good.
Wednesday and Thursday don’t look like much – onshore winds, cross-chop, small waves. Not your day.
Then, hold onto your board, because Thursday the 24th morning brings a pulse of serious energy. We’ve got a long-period groundswell from the SE at 5ft and a period of 18 seconds – that’s very long period. Combined energy is massive at (1622). The wind is light and cross from the NNW, so it should be clean. That said, with that kind of period, beach breaks can get a bit straight and tricky – but Prainha can handle it. This one’s for the advanced crew only though, as it’s pushing over 5ft and the power is intense.
Friday the 25th morning might just be the standout. The swell drops a touch to 4ft from the SE, still a long 16-second period, and the wind is dead calm – glassy conditions. Combined energy is still strong at (771). This is the pick of the window. Clean, solid groundswell, no wind, and the water will be smooth as glass. If you can only pick one session, make it this one.
After that, the energy fades fast and we’re back to small, weak, and mostly onshore through the weekend and into the following week. No real standouts after Friday.
So, bottom line: the first week is mostly a bust. Tuesday the 15th morning is a decent warm-up, but the real gold is Thursday the 24th for the big stuff and Friday the 25th morning for the clean, glassy gem. Get on it if you can.
- Rusty
Short Range ForecastHeavy rain (total 114mm), heaviest during Sun afternoon. Very mild (max 18°C on Sat morning, min 14°C on Mon night). Winds decreasing (fresh winds from the S on Sun afternoon, light winds from the SSE by Mon afternoon). | Days 4-6 Weather SummarySome drizzle, heaviest during Thu night. Very mild (max 18°C on Tue morning, min 16°C on Tue morning). Wind will be generally light. | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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 8 | SE 6 | SSE 7 | SSE 6 | SSE 7 | SE 5 | ESE 6 | ESE 7 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | SSE 7 | SSE 8 | SSE 8 | SE 12 | SE 11 | SE 13 | SE 13 | SE 13 | SE 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 42 | 59 | 294 | 194 | 214 | 36 | 43 | 163 | 630 | 206 | 216 | 268 | 258 | 226 | 231 | 132 | 73 | 41 | 61 | 46 | 60 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross-off | cross-off | cross | cross | cross | cross-off | cross-off | cross-on | cross-off | cross | cross-on | cross | cross-on | on | on | glassy | glassy | cross-off |
High Tide | 3:34PM1.27m | 3:36AM1.37m | 4:00PM1.20m | 4:11AM1.30m | 4:24PM1.12m | 4:47AM1.20m | 4:46PM1.03m | 5:29AM1.08m | 5:05PM0.94m | 6:25AM0.96m | 3:17PM0.86m | 7:47AM0.87m | 2:57PM0.84m | 7:29PM0.75m | |||||||
Low Tide | 8:38PM0.22m | 9:03AM0.11m | 9:02PM0.16m | 9:27AM0.19m | 9:31PM0.14m | 9:52AM0.29m | 10:01PM0.16m | 10:20AM0.40m | 10:35PM0.22m | 10:50AM0.52m | 11:13PM0.32m | 11:26AM0.65m | 6:08PM0.74m | ||||||||
 | |  |  |  |  | | |  |  |  |  | |  | | | |  | | | | |
 | 6:15 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — | 6:07 | — | — |
 | — | 6:05 | — | — | 6:06 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — |
mm | 3 | 5 | 9 | 10 | 20 | 37 | 11 | 15 | 4 | — | — | — | — | — | — | — | — | 1 | — | 4 | 2 |
Temp °C | 18 | 18 | 16 | 15 | 16 | 16 | 16 | 16 | 15 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 17 | 17 | 17 |
Feels °C | 16 | 16 | 12 | 12 | 12 | 13 | 14 | 15 | 14 | 17 | 16 | 14 | 14 | 13 | 14 | 15 | 16 | 14 | 18 | 18 | 18 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | SE 7 | SE 6 | SE 6 | E 8 | ESE 6 | SE 7 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | SE 8 | SE 7 | SE 8 | SE 12 | SE 11 | SE 13 | E 5 | E 6 | E 6 |
| kJ | 42 | 30 | 91 | 46 | 61 | 18 | 43 | 54 | 273 | 206 | 216 | 264 | 187 | 54 | 97 | 132 | 73 | 41 | 27 | 46 | 41 |
Swell 2 Height (m) Direction Period (s) | E 12 | E 12 | E 8 | E 8 | E 8 | SE 13 | SE 7 | ENE 6 | SE 11 | SSE 8 | SSE 8 | — | SSE 12 | E 8 | E 8 | ESE 8 | ESE 8 | ESE 11 | SE 13 | SE 13 | SE 13 |
| kJ | 3 | 3 | 30 | 20 | 20 | 7 | 18 | 10 | 5 | 23 | 40 | — | 14 | 49 | 30 | 20 | 22 | 37 | 61 | 44 | 60 |
Swell 3 Height (m) Direction Period (s) | SE 11 | — | E 11 | E 12 | — | SSE 13 | E 8 | E 8 | SE 8 | SSE 10 | SE 8 | — | SSE 11 | SE 12 | E 12 | E 11 | E 11 | ESE 11 | ESE 10 | SE 10 | ESE 8 |
| kJ | 5 | — | 3 | 3 | — | 17 | 10 | 22 | 11 | 20 | 24 | — | 11 | 6 | 3 | 10 | 10 | 22 | 18 | 25 | 14 |
Wind waves Height (m) Direction Period (s) | SE 4 | SE 6 | SSE 7 | SSE 6 | SSE 7 | SE 5 | — | ESE 7 | ESE 8 | — | — | SE 8 | SSE 7 | SSE 8 | SSE 8 | — | — | E 4 | — | — | — |
| kJ | 2 | 59 | 294 | 194 | 214 | 36 | — | 163 | 630 | — | — | 268 | 258 | 226 | 231 | — | — | 13 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 52 | 210 | 61 | 61 | 129 | 126 | 80 | 52 | 11 | 0 | 235 | 61 | 61 | 235 | 62 | 28 | 73 | 73 | 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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