Surf Forecasts:
Prainha surf forecast from 5 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 6AM (local time) - 4.5ft (1.3m), 6s period, E swell with offshore winds.
- Most powerful swell: Monday 7 Sep, 3AM (local time) - 8ft (2.4m), 9s period, SSE swell with 898 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 12AM (local time) - 3.5ft (1.0m), 5s period with SSE 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 Sunday (Sep 06) at 12AM. The primary swell is predicted to be 1.0m and 5s period with a secondary swell of 0.6m and 5s. Another secondary swell of 0.6m and 8s 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 2.4m 9s and forecast to arrive on Monday (Sep 07) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 7s period and expected on Tuesday (Sep 08) at 12PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 6th Sep) | 3.5ft (1.0m) 5s |
| Best Surf | 6AM (Tue 8th Sep) | 4.5ft (1.3m) 6s |
| Most Powerful | 3AM (Mon 7th Sep) | 8ft (2.4m) 9s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break it down.
This stretch is pretty flat for the most part. There’s a big gap with no real surf to speak of for about a week and a half. The only wave worth talking about shows up on Tuesday, September 15th.
The only break in the game is Prainha. It’s an advanced spot, breaks a lot, and catches whatever swell comes in. Water temp is 69°F, which is a touch warmer than usual for this time of year.
The first week is mostly small, messy, and not worth suiting up. Saturday the 5th kicks off with rain, a 30 km/h cross wind, and a tiny 2ft east swell. No thanks. Sunday the 6th morning is cleaner with a light south wind, but the swell is only 2ft. Afternoon gets lumpy again. The pattern holds through the week: tiny swells, funky winds, and combined energy barely cracking triple digits.
The one standout is Tuesday morning, September 15th. Clear skies, a light 10 km/h cross-off breeze from the west, and a 3ft SE swell with a period of 11 seconds. That longer period gives the waves some real shape. The combined energy is 202 (moderate), and it’s clean. Crowds can be an issue here, so get out early. After lunch the wind shifts onshore and kills it.
After that, the forecast goes back to small, choppy, or wind-blown waves all the way to the end on the 20th. Sunday the 20th morning offers a clean 3ft east swell with offshore wind, but it’s still nothing to write home about.
So your one shot is Tuesday the 15th morning. The rest is a waiting game.
Rusty.
Short Range ForecastHeavy rain (total 34mm), heaviest during Sat afternoon. Very mild (max 15°C on Sat afternoon, min 12°C on Sun night). Winds decreasing (fresh winds from the SSE on Sun afternoon, calm by Mon night). | Days 5-7 Weather SummaryHeavy rain (total 25mm), heaviest during Wed night. Warm (max 21°C on Thu afternoon, min 15°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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 | SSE 5 | E 8 | SE 7 | SE 10 | SSE 7 | SE 11 | E 5 | E 6 | E 7 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 68 | 54 | 30 | 188 | 424 | 365 | 29 | 48 | 73 | 159 | 164 | 149 | 124 | 97 | 80 | 84 | 82 | 63 | 63 | 61 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross | cross-off | cross-off | cross | off | off | glassy | off | glassy | cross-on | glassy | cross | cross | glassy | cross-on | cross-on | cross-on |
High Tide | 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 | 3:06PM1.32m | ||||||||
Low Tide | 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 | 8:27AM0.01m | 8:19PM0.30m | |||||||
 |  |  |  |  | | |  | | |  |  |  |  |  | |  | | |  | |
 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 6:02 | — | — | 6:02 | — | — | 6:02 | — | — | 6:04 | — | — | 6:04 | — | — | 6:05 | — | — | 6:05 | — |
mm | 19 | 13 | 1 | — | 1 | — | — | — | — | — | — | — | — | 22 | 2 | — | — | 1 | 4 | 6 |
Temp °C | 15 | 15 | 15 | 14 | 14 | 14 | 15 | 15 | 15 | 16 | 17 | 18 | 19 | 20 | 20 | 21 | 20 | 19 | 19 | 21 |
Feels °C | 11 | 13 | 13 | 7 | 7 | 10 | 12 | 15 | 14 | 16 | 17 | 17 | 18 | 22 | 21 | 23 | 21 | 18 | 19 | 21 |
Swell 1 Height (m) Direction Period (s) | E 8 | SE 5 | E 8 | E 8 | E 8 | SE 6 | SE 5 | ESE 5 | E 6 | E 7 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 |
| kJ | 68 | 21 | 30 | 12 | 5 | 75 | 23 | 19 | 73 | 159 | 164 | 149 | 124 | 97 | 80 | 84 | 82 | 63 | 63 | 61 |
Swell 2 Height (m) Direction Period (s) | — | E 8 | E 9 | — | — | E 8 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 12 | SE 12 | SE 13 | SE 16 | SSE 14 | SE 12 | E 13 | E 12 |
| kJ | — | 44 | 7 | — | — | 5 | 29 | 23 | 25 | 25 | 26 | 25 | 37 | 23 | 27 | 38 | 18 | 6 | 3 | 3 |
Swell 3 Height (m) Direction Period (s) | — | SE 10 | SE 10 | — | — | E 8 | E 8 | SE 12 | SE 13 | ESE 12 | S 16 | SSE 14 | SSE 12 | E 14 | SE 17 | SE 12 | E 14 | E 13 | SE 12 | S 11 |
| kJ | — | 15 | 4 | — | — | 5 | 5 | 24 | 25 | 15 | 5 | 20 | 56 | 4 | 11 | 6 | 4 | 3 | 6 | 3 |
Wind waves Height (m) Direction Period (s) | SE 5 | SSE 5 | SSE 5 | SE 7 | SE 10 | SSE 7 | — | E 5 | E 6 | ENE 7 | — | — | — | — | — | SE 2 | — | — | — | NE 4 |
| kJ | 31 | 54 | 17 | 188 | 424 | 365 | — | 48 | 176 | 285 | — | — | — | — | — | 1 | — | — | — | 5 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 61 | 0 | 0 | 281 | 62 | 28 | 28 | 0 | 0 | 0 | 0 | 0 | 73 | 0 | 4 | 4 | 0 | 28 | 40 | 40 |
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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