Surf Forecasts:
Prainha surf forecast from 7 Sep 2026:
- Best quality surf: Monday 14 Sep, 9PM (local time) - 3ft (0.9m), 13s period, SE swell with glassy winds.
- Most powerful swell: Monday 14 Sep, 6PM (local time) - 7ft (2.1m), 13s period, SE swell with 1,348 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 12AM (local time) - 2ft (0.6m), 10s 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 (Sep 08) at 12AM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.3m and 12s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Prainha in the next 16 days are 2.1m 13s and forecast to arrive on Monday (Sep 14) at 6PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 6s period and expected on Friday (Sep 11) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 8th Sep) | 2ft (0.6m) 10s |
| Best Surf | 9PM (Mon 14th Sep) | 3ft (0.9m) 13s |
| Most Powerful | 6PM (Mon 14th Sep) | 7ft (2.1m) 13s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, Rusty here again, giving you the lowdown for the Prainha stretch.
The start of this forecast is a total washout. For the first week or so, there's just nothing going on. Small, weak, and messy. A big blank run until we get into the second week.
The real highlight is shaping up for Tuesday, September 15th. That morning, Prainha is gonna be firing. A solid 8ft swell from the east, and a light offshore breeze from the WSW is going to groom it into something special. The combined energy is pumping strong (1535). This is a big-wave day for the experienced surfers only. The water is about 69°F, which feels a touch warmer than usual for this time of year.
Tuesday afternoon is still good at 5ft, and it goes glassy, which is about as clean as it gets. Wednesday morning, September 16th, you get another chance with 4ft waves and dead calm, glassy conditions. Those are your best bets.
Once we hit Wednesday afternoon, the wind shifts onshore and things turn ugly. The rest of the run into the 22nd is mostly poor, with onshore winds and chopped-up surf. There's a couple of clean mornings with small waves and offshore breezes on the 21st and 22nd, but the energy is weak and the waves are just so-so. It's a tough stretch after that Tuesday morning.
Keep an eye on that Tuesday session, it's the one.
Rusty
Short Range ForecastLight rain (total 4mm), mostly falling on Wed night. Very mild (max 19°C on Wed afternoon, min 13°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 47mm), heaviest during Thu night. Warm (max 23°C on Fri afternoon, min 15°C on Sun morning). Winds increasing (calm on Thu night, strong winds from the W by Fri night). | |||||||||||||||||||
Mon 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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 11 | SE 10 | SE 10 | SE 10 | E 7 | E 8 | E 8 | E 8 | E 8 | SE 16 | E 7 | E 8 | ESE 13 | E 12 | E 8 | E 8 | SE 8 | SE 13 | SE 12 | SE 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 29 | 80 | 77 | 27 | 73 | 116 | 129 | 102 | 72 | 64 | 39 | 55 | 17 | 5 | 72 | 66 | 329 | 854 | 619 | 172 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | off | on | cross-off | glassy | cross-on | glassy | cross-off | on | cross-off | cross-on | cross-on | cross-off | cross-off | cross | cross | cross | cross-on | cross-on |
High Tide | 00:36AM1.07m | 1:31PM1.32m | 1:16AM1.21m | 2:05PM1.35m | 1:52AM1.32m | 2:37PM1.35m | 2:28AM1.38m | 3:06PM1.32m | 3:02AM1.40m | 3:34PM1.27m | 3:36AM1.37m | 4:00PM1.20m | ||||||||
Low Tide | 8:04PM0.43m | 7:41AM0.09m | 8:23PM0.43m | 8:02AM0.03m | 8:27PM0.42m | 8:16AM0.00m | 8:16PM0.38m | 8:27AM0.01m | 8:19PM0.30m | 8:43AM0.05m | 8:38PM0.22m | 9:03AM0.11m | 9:02PM0.16m | |||||||
 |  |  | | | | |  |  |  |  |  | | | | |  |  | | | |
 | — | — | 6:18 | — | — | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — | 6:15 | — | — | 6:13 | — | — |
 | 6:02 | — | — | 6:04 | — | — | 6:04 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:06 | — |
mm | — | — | — | — | — | — | — | 3 | 1 | 7 | 15 | 1 | — | 9 | — | — | 4 | 11 | 14 | 21 |
Temp °C | 15 | 15 | 16 | 17 | 17 | 18 | 19 | 19 | 18 | 19 | 19 | 20 | 23 | 22 | 20 | 18 | 17 | 16 | 15 | 16 |
Feels °C | 12 | 14 | 15 | 17 | 18 | 17 | 19 | 20 | 19 | 21 | 21 | 20 | 22 | 17 | 17 | 13 | 12 | 11 | 11 | 16 |
Swell 1 Height (m) Direction Period (s) | SE 5 | SE 10 | SE 10 | ESE 6 | E 7 | E 8 | E 8 | E 8 | E 8 | E 8 | E 7 | E 8 | SE 12 | ENE 6 | E 8 | E 8 | E 9 | E 9 | E 9 | SE 6 |
| kJ | 17 | 80 | 77 | 27 | 73 | 116 | 129 | 102 | 72 | 54 | 39 | 55 | 6 | 82 | 72 | 66 | 55 | 41 | 24 | 46 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 12 | SE 12 | SE 10 | SE 10 | SE 10 | SE 12 | SE 12 | SE 13 | SE 16 | SE 14 | SSE 12 | E 13 | E 12 | E 12 | — | — | — | E 9 | SE 12 |
| kJ | 29 | 24 | 24 | 24 | 35 | 26 | 35 | 23 | 26 | 39 | 32 | 15 | 3 | 3 | 3 | — | — | — | 40 | 172 |
Swell 3 Height (m) Direction Period (s) | E 8 | E 8 | E 8 | SE 12 | ESE 12 | — | SE 13 | E 15 | SE 17 | SE 16 | E 9 | E 13 | ESE 13 | SE 11 | S 11 | SE 12 | — | — | — | SE 15 |
| kJ | 5 | 5 | 5 | 24 | 15 | — | 44 | 4 | 11 | 64 | 15 | 3 | 17 | 5 | 2 | 5 | — | — | — | 107 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NE 2 | — | — | — | — | — | ENE 8 | — | SSW 3 | SSE 3 | SE 8 | SE 13 | SE 12 | — |
| kJ | — | — | — | — | — | — | 1 | — | — | — | — | — | 79 | — | 1 | 2 | 329 | 854 | 619 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 128 | 0 | 0 | 61 | 0 | 0 | 73 | 0 | 0 | 28 | 0 | 4 | 236 | 4 | 61 | 133 | 133 | 129 | 121 | 91 |
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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