Surf Forecasts:
Prainha surf forecast from 12 Sep 2026:
- Best quality surf: Monday 14 Sep, 3PM (local time) - 4.5ft (1.4m), 7s period, E swell with cross-offshore winds.
- Most powerful swell: Sunday 13 Sep, 12AM (local time) - 5.5ft (1.7m), 7s period, SSE swell with 278 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 3PM (local time) - 4.5ft (1.4m), 7s 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 (Sep 14) at 3PM. The primary swell is predicted to be 1.4m and 7s period with a secondary swell of 1.0m and 6s. Another secondary swell of 0.4m 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 1.7m 7s and forecast to arrive on Sunday (Sep 13) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 5s period and expected on Saturday (Sep 12) at 3AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Mon 14th Sep) | 4.5ft (1.4m) 7s |
| Best Surf | 3PM (Mon 14th Sep) | 4.5ft (1.4m) 7s |
| Most Powerful | 12AM (Sun 13th Sep) | 5.5ft (1.7m) 7s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
G’day, I’m Rusty. Let’s run through what’s on the cards for Prainha over the next couple of weeks.
To be upfront, it’s a pretty thin run. The first few days are flat and choppy, so don’t rush to wax up. Surf doesn't really show until the tail end of the first week, and even then it’s more about clean conditions than any sort of size.
Saturday the 12th starts off with a weak 2ft east swell, crossed up by a 25 km/h SSE wind, and the combined energy is just 58 – weak and unappealing. Sunday the 13th jumps to about 5ft from the SSE with a cross-off breeze and moderate energy (301), but the short 6-second period makes it messy. That Monday afternoon the 14th is the first real window: a 5ft east swell with a light 10 km/h cross-off wind and 312 combined energy. It’s clean and rideable.
Tuesday the 15th morning is the pick of this first week. The swell drops to 3ft from the east, but the wind shifts offshore from the southwest at 10 km/h, leaving it glassy. The energy is 182, and for a small day, it’ll be a fun, tidy session.
The middle of the week flattens out again. By Thursday the 17th morning we get a glassy 3ft ESE swell with a 9-second period and 133 energy – surfable but nothing special.
The second week stays small, but there are a few clean mornings. Tuesday the 22nd has 2ft from the southeast with a 10-second period, offshore wind from the southwest at 15 km/h, and 127 energy. Super clean but tiny. Wednesday the 23rd morning is the same story with 2ft from the southeast, a 12-second period, and gentle offshore wind – energy drops to 86. Thursday the 24th morning is glassy again with 3ft from the SSE and 89 energy.
The standout, if you’re a patient soul, is Friday the 25th morning. We’re looking at 2ft from the southeast, but the period is a very long 14 seconds – that’s proper groundswell. The wind is glassy out of the west, and the combined energy sits at 198. That long period will bring cleaner, more powerful lines, but at this size it’s a small-wave day with good shape. It’s promising, but it’s two weeks out, so keep an eye on it.
Overall, Prainha is usually reliable, but this forecast is a snoozer. The water temperature is about average for this time of year.
Rusty.
Short Range ForecastHeavy rain (total 112mm), heaviest during Sun afternoon. Warm (max 20°C on Fri night, min 14°C on Mon morning). Winds increasing (light winds from the S on Fri night, fresh winds from the S by Sun afternoon). | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Mon night. Very mild (max 18°C on Tue morning, min 14°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | ||||||||||||||
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 | SE 6 | SSE 7 | SSE 6 | SSE 7 | SE 7 | SE 8 | E 7 | E 8 | E 8 | E 8 | E 8 | SE 7 | SE 7 | SSE 7 | ESE 9 | ESE 9 | ESE 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 28 | 42 | 56 | 278 | 218 | 214 | 128 | 44 | 188 | 111 | 129 | 133 | 103 | 91 | 77 | 144 | 84 | 61 | 43 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross | cross-off | off | off | cross-on | cross-off | cross | cross | cross | glassy | on | cross-on |
High Tide | 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 | 6:25AM0.96m | 3:17PM0.86m | |||||||
Low Tide | 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 | 10:50AM0.52m | 11:13PM0.32m | |||||||
 |  |  | | |  | | | |  |  | |  | | |  | |  | | |
 | — | 6:15 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — |
 | 6:05 | — | 6:05 | — | — | 6:06 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — |
mm | 16 | 1 | 6 | 14 | 8 | 20 | 32 | 6 | 9 | 6 | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 18 | 17 | 16 | 15 | 15 | 16 | 16 | 15 | 15 | 18 | 18 | 18 | 16 | 17 | 16 | 17 | 18 | 18 |
Feels °C | 21 | 16 | 14 | 12 | 13 | 10 | 13 | 13 | 15 | 13 | 18 | 18 | 16 | 12 | 14 | 13 | 16 | 16 | 15 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | E 8 | SE 6 | SE 6 | SE 6 | SSE 8 | SE 8 | E 6 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | SE 7 | ESE 9 | ESE 9 | ESE 9 |
| kJ | 28 | 42 | 29 | 66 | 52 | 56 | 39 | 44 | 79 | 111 | 129 | 133 | 103 | 68 | 71 | 48 | 84 | 61 | 43 |
Swell 2 Height (m) Direction Period (s) | ENE 5 | E 12 | E 12 | E 8 | E 8 | E 8 | E 5 | E 5 | SE 11 | SE 8 | SE 9 | SE 8 | — | SE 12 | SSE 12 | E 9 | SSE 11 | SSE 10 | SE 10 |
| kJ | 9 | 3 | 3 | 30 | 31 | 31 | 12 | 13 | 40 | 25 | 30 | 11 | — | 23 | 14 | 79 | 12 | 9 | 4 |
Swell 3 Height (m) Direction Period (s) | E 12 | SE 11 | S 11 | E 11 | — | — | E 8 | E 8 | E 8 | SE 11 | SSE 8 | SE 11 | — | — | — | SSE 13 | SSE 10 | E 11 | SSE 10 |
| kJ | 3 | 5 | 2 | 3 | — | — | 18 | 11 | 5 | 5 | 23 | 5 | — | — | — | 17 | 37 | 10 | 20 |
Wind waves Height (m) Direction Period (s) | — | SE 4 | SE 6 | SSE 7 | SSE 6 | SSE 7 | SE 7 | — | E 7 | — | — | — | SE 4 | SE 7 | SE 7 | SSE 7 | — | — | ENE 3 |
| kJ | — | 8 | 56 | 278 | 218 | 214 | 128 | — | 188 | — | — | — | 28 | 91 | 77 | 144 | — | — | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 33 | 61 | 235 | 11 | 52 | 80 | 129 | 126 | 0 | 0 | 0 | 128 | 61 | 61 | 80 | 61 | 0 | 73 | 4 |
Best forecast wave conditions in Santa Catarina - Norte | |||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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