Surf Forecasts:
Rosa surf forecast from 13 Aug 2026:
- Best quality surf: Thursday 13 Aug, 3PM (local time) - 6ft (1.9m), 13s period, S swell with cross-offshore winds.
- Most powerful swell: Thursday 13 Aug, 6PM (local time) - 7ft (2.1m), 13s period, S swell with 1,514 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 3PM (local time) - 6ft (1.9m), 13s period with S swell.
Best Forecast Surf Conditions for Rosa this week:
The surf forecast for Rosa over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 13) at 3PM. The primary swell is predicted to be 1.9m and 13s period with a secondary swell of 0.4m and 5s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Rosa in the next 16 days are 2.1m 13s and forecast to arrive on Thursday (Aug 13) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Tuesday (Aug 18) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Thu 13th Aug) | 6ft (1.9m) 13s |
| Best Surf | 3PM (Thu 13th Aug) | 6ft (1.9m) 13s |
| Most Powerful | 6PM (Thu 13th Aug) | 7ft (2.1m) 13s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
Second text (Imperial)
Alright, let’s talk Rosa in numbers you can feel in your bones.
We kick off Thursday morning with a solid 7ft south swell, a long 14-second period pushing the energy to 1587. That’s some serious grunt. Water temp is sitting about average for this time of year at 66°F. The wind is a light cross-offshore, keeping it clean. This is for experienced surfers only – the size and power mean business. The wave quality is excellent.
That keeps rolling into Thursday afternoon, still a strong 6ft south swell with a 13-second period, energy at 1313. Still clean, still quality.
Friday morning the swell holds at 6ft from the SSE, period 13 seconds, energy 1460, but the wind turns onshore. It’s light, so it’s not blown out, but it’s not as good. The quality drops.
Friday afternoon bumps up a bit to 7ft from the SSE, but the onshore wind strengthens and things get messy. Saturday sees a drop in size, the wind goes cross, and the period shortens. Surf turns marginal. Sunday the wind howls and conditions get poor. That poor spell runs through Monday into Tuesday morning, though Tuesday morning does give us a glassy, clean 5ft east-northeast swell – a small, clean window.
Then it’s back to marginal or poor through Wednesday and Thursday. Thursday afternoon (20th) goes glassy again but with a tiny 5ft easterly swell and a short period.
Now listen up. Friday the 21st of August is a standout. The morning brings a clean 7ft south swell. The wind is a light cross-offshore, making for very good surf. This is the pick of the first week.
But the real highlight is Monday the 24th of August. The morning cranks with a 6ft south swell, 12-second period, energy at 1127, and a light cross-offshore breeze. Excellent conditions for the experienced. Then Tuesday the 25th afternoon – a solid 8ft south swell with a 12-second period and energy roaring at 3673. That’s a ton of power. The wind is a light cross-onshore, so it’s a bit bumpy, but the size is massive for those who want a real test.
So, a decent start for the big-wave crew, then a quiet patch, followed by a real promising run of south swells in the second week, especially around the 21st and then the 24th and 25th. Rosa is pretty consistent, so it won't stay quiet for long.
Rusty.
Short Range ForecastHeavy rain (total 64mm), heaviest during Fri night. Very mild (max 18°C on Fri night, min 17°C on Thu morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sun morning. Warm (max 24°C on Mon morning, min 16°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | S 14 | S 13 | S 13 | SSE 13 | SSE 13 | S 12 | S 12 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | S 8 | S 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1576 | 1303 | 713 | 1127 | 1430 | 773 | 456 | 481 | 406 | 511 | 592 | 650 | 638 | 715 | 588 | 405 | 343 | 274 | 212 | 239 | 161 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-on | on | on | on | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross-off | cross-off | cross-off | glassy | cross |
High Tide | 3:20PM0.59m | 1:37AM0.66m | 2:58PM0.55m | 2:13AM0.70m | 3:07PM0.54m | 2:51AM0.70m | 3:26PM0.54m | 3:30AM0.67m | 3:49PM0.55m | 4:12AM0.62m | 4:15PM0.54m | 4:57AM0.55m | 12:02PM0.42m | ||||||||
Low Tide | 9:26PM0.35m | 9:35AM-0.04m | 9:48PM0.34m | 10:10AM0.04m | 10:06PM0.32m | 10:44AM0.13m | 7:53PM0.28m | 11:16AM0.24m | 8:20PM0.22m | 8:42AM0.31m | 8:52PM0.20m | 8:49AM0.34m | 1:09PM0.41m | 9:25PM0.21m | |||||||
 |  |  | |  |  | | |  | |  |  |  | |  | | |  | |  | | |
 | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — |
 | — | 5:51 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — |
mm | 2 | 9 | 10 | 4 | 9 | 21 | 5 | 2 | 2 | 3 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 24 | 24 | 19 | 23 | 22 | 17 | 17 | 18 | 16 |
Feels °C | 18 | 17 | 18 | 17 | 16 | 18 | 19 | 17 | 17 | 18 | 18 | 17 | 22 | 22 | 19 | 25 | 20 | 15 | 18 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | S 14 | S 13 | SSE 8 | SSE 13 | SSE 13 | S 12 | E 8 | S 11 | SSE 11 | SSE 10 | SSE 10 | S 10 | SSE 10 | SSE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | S 7 | S 8 | S 8 |
| kJ | 1576 | 1303 | 443 | 1127 | 1430 | 773 | 399 | 297 | 194 | 110 | 108 | 52 | 34 | 20 | 588 | 405 | 343 | 274 | 212 | 239 | 161 |
Swell 2 Height (m) Direction Period (s) | NE 5 | ENE 5 | S 13 | SE 8 | SE 7 | — | S 12 | S 11 | S 11 | S 10 | E 14 | — | S 10 | SE 8 | S 11 | S 10 | S 10 | — | ENE 9 | ENE 8 | ENE 8 |
| kJ | 11 | 10 | 713 | 133 | 105 | — | 456 | 411 | 231 | 138 | 15 | — | 52 | 3 | 20 | 17 | 16 | — | 172 | 134 | 76 |
Swell 3 Height (m) Direction Period (s) | — | — | NE 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | E 14 | SE 13 | SE 13 |
| kJ | — | — | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 7 | 7 |
Wind waves Height (m) Direction Period (s) | — | SSW 3 | ESE 7 | ESE 7 | E 6 | E 8 | — | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | — | SSW 3 | SSW 4 | S 7 | — | — | NE 4 |
| kJ | — | 7 | 222 | 256 | 137 | 588 | — | 481 | 406 | 511 | 592 | 650 | 638 | 715 | — | 4 | 21 | 202 | — | — | 14 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 24 | 2 | 2 | 85 | 2 | 2 | 25 | 2 | 2 | 47 | 63 | 115 | 2 | 2 | 11 | 2 | 0 | 0 | 4 |
Best forecast wave conditions in Santa Catarina - Sul | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Rosa surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Rosa Surf forecast
The above surf forecast table for Rosa provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Rosa can be found by selecting the local surf guide option on the grey menu. Our Rosa 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 (Rosa) 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 Rosa 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.
Rosa is 12 km (7 miles) from Imbituba. If you plan a holiday in Santa Catarina - Sul, look for hotels and other accommodation in Imbituba. Imbituba has rooms for a wide range of budgets as well as car hire and transport links.
Nearest