Surf Forecasts:
Prainha surf forecast from 4 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 6PM (local time) - 4.5ft (1.4m), 8s period, E swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 9PM (local time) - 6ft (1.9m), 9s period, SE swell with 550 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 12PM (local time) - 3ft (0.9m), 6s 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 Monday (Sep 07) at 12PM. The primary swell is predicted to be 0.9m and 6s period with a secondary swell of 0.2m and 8s. Another secondary swell of 0.2m and 11s is also forecast. 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 1.9m 9s and forecast to arrive on Sunday (Sep 06) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 8s period and expected on Tuesday (Sep 08) at 6PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Mon 7th Sep) | 3ft (0.9m) 6s |
| Best Surf | 6PM (Tue 8th Sep) | 4.5ft (1.4m) 8s |
| Most Powerful | 9PM (Sun 6th Sep) | 6ft (1.9m) 9s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, let’s break down what’s coming up at Prainha.
Honestly, for the first week or so, it’s looking pretty bleak. You’re staring at about 8 days of flat, messy conditions where it’s not even worth strapping the board on the roof. The water temp is a comfortable 68°, which is a touch warmer than normal for this time of year, but that’s small comfort when there’s no surf.
The first real chance to get wet doesn’t come until Wednesday the 9th, first light. We’ve got a 4ft swell from the east, with a period of 8 seconds. The key thing here is the wind: a light offshore from the northwest, just 3 mph. That’s gonna keep the surface glassy and clean. The combined energy is moderate at 204. It’s not gonna be a bomb, but after a week of nothing, it’ll be welcome. This is the best option in the entire forecast. Remember, the afternoon gets ruined when the wind swings onshore, so hit it early.
Jump forward to Wednesday the 16th, afternoon session. A proper little pulse shows up. The swell is 4ft from the ESE, with a 7-second period. The wind turns offshore from the WSW at 9 mph. The combined energy jumps to 329, which is solidly moderate. This is a standout for the back half of the forecast, but since it's a week and a half out, treat it as a promising heads-up rather than a sure thing. That offshore wind should groom it nicely.
Then on the morning of Thursday the 17th, the swell pushes up to 5ft from the east with an 8-second period. The combined energy is a strong 650, so there’s a lot of power. The wind is a clean 12 mph from the SSW. This one is getting a bit stout – too big for beginners, but for the advanced crew on a beach break like Prainha, it could offer some punchy, hollow rides if you’re on your game. Again, this is a long-range look, so keep an eye on it.
So, bottom line: the first 8 days are a total loss. Your two windows to pencil in are the morning of Wednesday the 9th for a clean, small session, and the afternoon of Wednesday the 16th for something with more power and favorable wind.
Rusty.
Short Range ForecastHeavy rain (total 49mm), heaviest during Sat afternoon. Very mild (max 18°C on Fri morning, min 13°C on Sun night). Winds increasing (light winds from the ESE on Fri night, fresh winds from the SSE by Sun afternoon). | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Wed night. Very mild (max 19°C on Wed afternoon, min 12°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | |||||||||||||||
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) | SE 11 | SE 11 | E 8 | E 8 | E 8 | SE 6 | SSE 6 | SE 8 | SE 10 | SE 6 | SE 11 | SE 12 | SE 11 | E 7 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 58 | 57 | 69 | 90 | 68 | 95 | 41 | 91 | 496 | 82 | 30 | 108 | 40 | 212 | 207 | 190 | 160 | 132 | 104 | 78 | 58 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross | glassy | cross-off | cross | glassy | cross-off | cross-on | cross-off | cross-off | cross | glassy |
High Tide | 9:01AM0.96m | 2:40PM0.82m | 9:15PM0.73m | 3:19AM0.57m | 10:43PM0.79m | 12:01PM1.13m | 11:48PM0.92m | 12:52PM1.24m | 00:36AM1.07m | 1:31PM1.32m | 1:16AM1.21m | 2:05PM1.35m | 1:52AM1.32m | 2:37PM1.35m | 2:28AM1.38m | ||||||
Low Tide | 12:24PM0.76m | 6:21PM0.59m | 5:52AM0.48m | 7:03PM0.50m | 6:36AM0.32m | 7:37PM0.45m | 7:12AM0.19m | 8:04PM0.43m | 7:41AM0.09m | 8:23PM0.43m | 8:02AM0.03m | 8:27PM0.42m | 8:16AM0.00m | 8:16PM0.38m | |||||||
 |  |  |  |  |  | | | | | |  | | |  | |  | | | |  | |
 | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — | 6:16 | — | — |
 | — | 6:01 | — | — | 6:02 | — | — | 6:02 | — | — | 6:02 | — | — | 6:04 | — | — | 6:04 | — | — | 6:05 | — |
mm | — | — | 4 | 4 | 24 | 16 | — | — | 1 | — | — | 1 | — | — | — | — | — | 4 | 1 | — | — |
Temp °C | 18 | 18 | 17 | 16 | 15 | 15 | 15 | 15 | 14 | 14 | 16 | 16 | 15 | 17 | 17 | 18 | 19 | 19 | 18 | 18 | 18 |
Feels °C | 15 | 16 | 16 | 14 | 10 | 11 | 12 | 11 | 6 | 11 | 13 | 15 | 14 | 16 | 18 | 17 | 18 | 21 | 19 | 18 | 19 |
Swell 1 Height (m) Direction Period (s) | SE 11 | SE 5 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | SE 6 | SE 12 | ENE 6 | E 7 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 |
| kJ | 58 | 30 | 69 | 90 | 68 | 31 | 28 | 33 | 5 | 5 | 30 | 108 | 39 | 212 | 207 | 190 | 160 | 132 | 104 | 78 | 58 |
Swell 2 Height (m) Direction Period (s) | ENE 6 | E 8 | SE 5 | SE 5 | — | — | E 9 | E 9 | — | — | SE 11 | E 8 | SE 6 | SE 10 | SE 10 | SE 9 | SE 9 | SE 12 | SSE 12 | SSE 12 | SE 12 |
| kJ | 17 | 42 | 16 | 6 | — | — | 7 | 13 | — | — | 29 | 5 | 25 | 36 | 25 | 14 | 13 | 6 | 14 | 14 | 6 |
Swell 3 Height (m) Direction Period (s) | E 8 | SE 11 | SE 11 | SE 10 | — | — | — | — | — | — | E 8 | — | SE 11 | — | — | — | — | SE 9 | E 14 | E 14 | E 14 |
| kJ | 12 | 57 | 29 | 16 | — | — | — | — | — | — | 5 | — | 40 | — | — | — | — | 3 | 4 | 4 | 4 |
Wind waves Height (m) Direction Period (s) | SSE 2 | SSE 6 | SSE 6 | SSE 6 | SSE 4 | SE 6 | SSE 6 | SE 8 | SE 10 | SE 6 | — | — | — | E 7 | — | — | — | — | — | — | — |
| kJ | 1 | 84 | 47 | 24 | 32 | 95 | 41 | 91 | 496 | 82 | — | — | — | 447 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 61 | 129 | 61 | 80 | 126 | 126 | 61 | 1671 | 129 | 28 | 128 | 0 | 0 | 28 | 0 | 0 | 73 | 0 | 0 | 128 | 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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