Surf Forecasts:
Prainha surf forecast from 10 Sep 2026:
- Best quality surf: Monday 14 Sep, 9PM (local time) - 8ft (2.5m), 8s period, ESE swell with offshore winds.
- Most powerful swell: Monday 14 Sep, 6PM (local time) - 8ft (2.5m), 8s period, E swell with 836 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 6PM (local time) - 1.5ft (0.4m), 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 (Sep 10) at 6PM. The primary swell is predicted to be 0.4m and 15s period with a secondary swell of 0.7m 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 2.5m 8s and forecast to arrive on Monday (Sep 14) at 6PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 8s period and expected on Friday (Sep 11) at 6PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Thu 10th Sep) | 1.5ft (0.4m) 15s |
| Best Surf | 9PM (Mon 14th Sep) | 8ft (2.5m) 8s |
| Most Powerful | 6PM (Mon 14th Sep) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, this is Rusty.
Look, I'm going to be straight with you. The next two weeks are looking pretty grim for this region. We’ve got a long stretch of poor conditions with only a couple of very brief windows where it might be worth paddling out. This isn't one of those classic runs of swell; it’s a waiting game.
The first few days, from Thursday the 10th right through to Monday the 14th, are basically a write-off. We’ve got heavy rain, onshore winds, and a messy sea state. The swell is all over the place, and the wind is just ruining any chance of a clean face. For an advanced break like Prainha, it’s just frustrating.
The first real glimmer of hope shows up on Tuesday morning, September 15th. We’ve got a 4ft swell from the ESE, and the wind is swinging to a light 3 mph from the NW, giving us a clean, cross-off breeze. That’s the key. The combined swell energy is moderate (257), and with that glassy texture, Prainha could offer some tidy waves. The water temp is sitting at 68°F, which is about average for this time of year, so no surprises there. But this is just a morning window; the afternoon turns onshore and messy again.
Then we hit another dead spot until Saturday morning, September 19th. Another quick window: a 3ft swell from the E, with a light 3 mph NW cross-off wind keeping the surface clean. The combined energy is weak (159), so don’t expect any power, but for a grovel session, it’ll be surfable. Again, the afternoon blows out.
The very last chance in this 16-day window comes on Sunday morning, September 20th. It’s a small one – 3ft from the east – but the wind is a complete glass-off from the NNE at 3 mph. The combined energy is weak (91), so it’s not going to be a big-wave day, but for a clean, small-wave session with no wind, you could have some fun. Just don’t expect any crowds to be avoiding it, as this spot can get busy.
Overall, it’s a lean run. If you’re desperate, aim for those Tuesday and Saturday mornings. Otherwise, save your energy. The forecasts can change, but as it stands, there are no true standouts. It’s a quiet period.
- Rusty
Short Range ForecastHeavy rain (total 83mm), heaviest during Thu night. Warm (max 21°C on Thu afternoon, min 16°C on Sat morning). Winds increasing (calm on Thu night, fresh winds from the SSE by Fri night). | Days 4-6 Weather SummaryHeavy rain (total 52mm), heaviest during Sun night. Warm (max 21°C on Tue morning, min 15°C on Sun afternoon). Winds decreasing (fresh winds from the SSE on Mon morning, light winds from the WSW by Mon night). | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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 16 | E 7 | E 7 | E 13 | E 12 | SSE 8 | SE 8 | SE 9 | SE 9 | SE 9 | SE 8 | E 7 | E 8 | ESE 8 | ESE 8 | ESE 8 | SE 9 | ESE 8 | ESE 8 | SE 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 55 | 64 | 69 | 54 | 6 | 5 | 278 | 180 | 159 | 112 | 78 | 86 | 279 | 789 | 367 | 211 | 171 | 560 | 184 | 72 | 152 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-off | cross | cross-on | cross | cross | cross | cross | cross-on | cross | cross-on | cross-on | cross-off | off | cross-off | cross-on | cross | cross | cross | cross-on |
High Tide | 2:37PM1.35m | 2:28AM1.38m | 3:06PM1.32m | 3:02AM1.40m | 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 | ||||||||
Low Tide | 8:16PM0.38m | 8:27AM0.01m | 8:19PM0.30m | 8:43AM0.05m | 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 | ||||||||
 |  |  | | |  |  | | |  | | | | |  |  | | |  |  |  | |
 | 6:16 | — | — | 6:16 | — | — | 6:15 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:09 | — | — |
 | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:06 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — |
mm | 14 | 5 | 25 | 5 | 4 | 7 | 1 | 4 | 18 | 7 | 7 | 22 | 8 | 8 | — | — | — | — | — | — | 2 |
Temp °C | 19 | 21 | 21 | 20 | 20 | 20 | 16 | 17 | 17 | 16 | 15 | 17 | 17 | 16 | 17 | 21 | 18 | 17 | 17 | 17 | 17 |
Feels °C | 19 | 24 | 24 | 22 | 20 | 20 | 12 | 14 | 14 | 14 | 13 | 13 | 13 | 12 | 15 | 19 | 15 | 14 | 13 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | E 7 | E 7 | SE 12 | ENE 6 | E 7 | E 8 | SE 9 | SE 9 | SE 9 | SE 8 | SE 13 | E 8 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | E 8 | ESE 8 | SE 12 |
| kJ | 55 | 55 | 69 | 54 | 6 | 64 | 53 | 29 | 159 | 112 | 78 | 86 | 7 | 368 | 367 | 211 | 171 | 273 | 169 | 72 | 152 |
Swell 2 Height (m) Direction Period (s) | SE 13 | SE 16 | SE 14 | SSE 13 | E 13 | E 12 | E 12 | ESE 12 | E 8 | E 8 | E 8 | SE 14 | SSE 9 | SE 15 | SE 13 | SE 8 | S 11 | SE 11 | — | E 14 | ESE 5 |
| kJ | 25 | 40 | 30 | 16 | 3 | 3 | 3 | 14 | 31 | 31 | 45 | 8 | 16 | 8 | 7 | 196 | 2 | 5 | — | 4 | 14 |
Swell 3 Height (m) Direction Period (s) | SE 18 | SE 16 | E 14 | E 13 | — | SE 11 | — | — | — | — | — | S 11 | — | SE 15 | SSE 11 | SSE 11 | SSE 11 | — | — | — | E 8 |
| kJ | 12 | 64 | 4 | 3 | — | 5 | — | — | — | — | — | 2 | — | 8 | 68 | 25 | 39 | — | — | — | 33 |
Wind waves Height (m) Direction Period (s) | — | NE 3 | — | — | ENE 8 | — | SSE 8 | SE 8 | — | — | — | E 8 | E 7 | E 8 | — | — | — | SE 9 | ESE 8 | SE 5 | — |
| kJ | — | 2 | — | — | 75 | — | 278 | 180 | — | — | — | 55 | 279 | 789 | — | — | — | 560 | 184 | 30 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 40 | 0 | 4 | 54 | 4 | 182 | 61 | 126 | 62 | 52 | 33 | 181 | 62 | 0 | 0 | 750 | 61 | 61 | 218 | 28 |
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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