Surf Forecasts:
Prainha surf forecast from 31 Aug 2026:
- Best quality surf: Thursday 3 Sep, 9AM (local time) - 3ft (0.9m), 11s period, ESE swell with glassy winds.
- Most powerful swell: Wednesday 2 Sep, 3AM (local time) - 6.5ft (2.0m), 8s period, SSE swell with 476 kJ wave energy.
- Next surfable swell (1★+): Monday 31 Aug, 9PM (local time) - 2.5ft (0.7m), 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 (Aug 31) at 9PM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.6m and 7s. Another secondary swell of 0.3m and 3s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Prainha in the next 16 days are 2.0m 8s and forecast to arrive on Wednesday (Sep 02) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 7s period and expected on Tuesday (Sep 01) at 3PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 31st Aug) | 2.5ft (0.7m) 8s |
| Best Surf | 9AM (Thu 3rd Sep) | 3ft (0.9m) 11s |
| Most Powerful | 3AM (Wed 2nd Sep) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what we’ve got coming down the line for this stretch of coast.
Alright, let’s be honest right off the bat: the first week is a grind. We’re starting on Monday the 31st of August, and while there is small wave energy around, it’s nothing to write home about. The first few days are made up of little ankle-to-knee high dribblers, mostly from the east, with periods that are on the shorter side. It’s going to be a slow start.
We do get a bit of a pulse building into Wednesday the 3rd of September, and that morning is the first real standout. Prainha sees a clean, glassy start to the day with that wind going calm. The swell is 3 ft from the ESE, but the period bumps up to 11 seconds – so you get a bit more push and shape to the waves. It’s a moderate wave energy session (combined energy of 224), and the water temperature is sitting at 69°, which is a touch warmer than normal for this time of year. For the advanced surfer needing a fix, that Thursday morning window is the best on offer for the first week.
Things then go pretty average again until we hit a promising window around the 10th of September – that’s a Thursday again. The morning of the 10th flips the script. Swell picks up to 5 ft from the east, period at 8 seconds, and the wind is glassy with a "W" breeze. The combined energy jumps to 248 – moderate energy but very surfable. That is another cracker of a morning session.
After that, the swell size really starts to muscle up. On Thursday afternoon the 10th, the swell jumps to 7 ft from the east (combined energy of 941) – but the wind gets ugly, pushing cross-onshore and blowing it out. That one is for experts only, and even then, only if you’re willing to battle the chop.
The standout of the whole outlook? It has to be Monday the 14th of September. Early morning glass: zero wind, the water is like a mirror. Swell is a clean 3 ft from the SE, period at 11 seconds, and the combined energy is the highest we see – 268. The waves will have proper shape and the clean conditions make it the pick of the entire run. That is the session to book in for.
After that, we move into Tuesday the 15th with some longer period groundswell (12 seconds) from the SE and swell around 4 ft to 4 ft, but wind is light cross-shore, so it’s still rideable. The energy stays solid (336 in the morning). It just won’t be as flawless as the day before.
Overall, there’s surf spread across the fortnight, but the real gems are that Thursday morning the 10th and the Monday the 14th glass-off. The first few days are a fade, but don’t write off the second week – it brings the goods.
Stay frothing,
Rusty
Short Range ForecastHeavy rain (total 54mm), heaviest during Mon night. Very mild (max 19°C on Mon afternoon, min 15°C on Wed night). Winds increasing (calm on Mon night, fresh winds from the SSE by Tue afternoon). | Days 5-7 Weather SummaryHeavy rain (total 33mm), heaviest during Sat afternoon. Warm (max 21°C on Fri morning, min 16°C on Thu night). Winds increasing (calm on Thu night, fresh winds from the SSE by Sun morning). | |||||||||||||||||||
Mon 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | ||||||||||||||
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 | E 8 | ESE 8 | ESE 8 | SSE 8 | SE 8 | SE 9 | ESE 10 | ESE 11 | ESE 11 | SE 11 | ESE 11 | E 8 | E 8 | E 8 | E 8 | E 8 | SE 5 | SE 6 | SE 5 |
Wave Graph | ||||||||||||||||||||
68 | 66 | 72 | 107 | 468 | 132 | 152 | 175 | 200 | 183 | 119 | 79 | 60 | 86 | 66 | 69 | 47 | 57 | 59 | 52 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | cross | cross-off | cross | on | cross-on | glassy | cross-on | cross | off | cross | cross | cross-off | cross-off | cross | cross | cross | cross |
High Tide | 5:07PM1.17m | 5:20AM1.23m | 5:47PM1.03m | 6:15AM1.12m | 6:36PM0.89m | 7:27AM1.00m | 2:49PM0.76m | 7:45PM0.77m | 3:40AM0.65m | 2:40PM0.82m | 9:15PM0.73m | 3:19AM0.57m | 10:43PM0.79m | 12:01PM1.13m | 11:48PM0.92m | |||||
Low Tide | 9:57PM0.22m | 10:24AM0.23m | 10:29PM0.25m | 10:58AM0.39m | 11:06PM0.31m | 11:36AM0.57m | 5:15PM0.69m | 11:50PM0.40m | 4:45AM0.64m | 12:24PM0.76m | 6:21PM0.59m | 5:52AM0.48m | 7:03PM0.50m | 6:36AM0.32m | 7:37PM0.45m | |||||
— | — | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | |
6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:02 | — | — | 6:02 | — | |
mm | 12 | 36 | 1 | 5 | — | — | — | — | — | — | — | — | 2 | 7 | 2 | 16 | 5 | 1 | 2 | 1 |
Temp °C | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 17 | 18 | 18 | 21 | 19 | 17 | 17 | 16 | 17 | 16 | 16 | 16 |
Feels °C | 21 | 22 | 20 | 14 | 15 | 15 | 17 | 17 | 15 | 16 | 17 | 22 | 16 | 14 | 16 | 14 | 14 | 12 | 10 | 12 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | ESE 8 | ESE 8 | SE 8 | SE 8 | SE 9 | ESE 10 | ESE 11 | ESE 11 | SE 11 | ENE 5 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 |
68 | 66 | 72 | 107 | 242 | 132 | 152 | 175 | 200 | 183 | 119 | 23 | 60 | 86 | 66 | 69 | 47 | 30 | 20 | 18 | |
Swell 2 Height (m) Direction Period (s) | SE 6 | SE 7 | E 8 | ENE 7 | — | E 9 | E 9 | E 9 | E 9 | E 9 | ENE 4 | ESE 11 | SE 11 | SSE 5 | SSE 4 | S 15 | SE 14 | SE 9 | S 12 | — |
14 | 33 | 45 | 73 | — | 80 | 58 | 39 | 24 | 24 | 18 | 79 | 56 | 14 | 4 | 4 | 8 | 3 | 3 | — | |
Swell 3 Height (m) Direction Period (s) | — | E 9 | E 8 | E 8 | — | — | — | — | NNE 3 | — | E 9 | E 8 | SE 11 | SE 10 | SE 10 | — | — | SE 13 | SE 12 | — |
— | 39 | 21 | 5 | — | — | — | — | 2 | — | 23 | 12 | 55 | 26 | 16 | — | — | 7 | 6 | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SSE 8 | — | — | — | — | NE 3 | NE 5 | — | — | — | — | SSE 4 | SE 5 | SE 5 | SE 6 | SE 5 |
— | — | — | — | 468 | — | — | — | — | 5 | 41 | — | — | — | — | 14 | 42 | 57 | 59 | 52 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 181 | 62 | 52 | 128 | 4 | 0 | 73 | 4 | 0 | 129 | 100 | 0 | 28 | 126 | 182 | 235 | 129 |
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.











