Surf Forecasts:
Rosa surf forecast from 13 Aug 2026:
- Best quality surf: Thursday 13 Aug, 6AM (local time) - 6ft (1.9m), 14s period, SSE swell with cross-offshore winds.
- Most powerful swell: Thursday 13 Aug, 9AM (local time) - 6.5ft (2.0m), 14s period, S swell with 1,576 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 6AM (local time) - 6ft (1.9m), 14s period with SSE 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 6AM. The primary swell is predicted to be 1.9m and 14s period with a secondary swell of 0.6m 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 2.0m 14s and forecast to arrive on Thursday (Aug 13) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Tuesday (Aug 18) at 6AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 13th Aug) | 6ft (1.9m) 14s |
| Best Surf | 6AM (Thu 13th Aug) | 6ft (1.9m) 14s |
| Most Powerful | 9AM (Thu 13th Aug) | 6.5ft (2.0m) 14s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
Alright surfers, let’s talk about Rosa. Water temp is sitting about normal for this time of year, nothing weird.
Thursday the 13th morning kicks off with a 7ft S swell at 14 seconds, packing plenty of power—combined energy at 1586. Light cross-off wind, clean faces. That’s proper groundswell and it’s set for experienced surfers. Grab it early.
Thursday afternoon the 13th, the energy drops a little and it’s still clean, but not as sharp. Friday through the weekend, winds turn cross-on and the swell gets short and weak (5–9 seconds). It gets choppy and messy. Sunday the 16th and Monday the 17th are poor—fresh winds, lumpy, not worth paddling out unless you’re after a fight.
Tuesday the 18th morning cleans up with a light wind and 5ft swell, but it’s marginal with low energy (522). Not the main attraction.
The big standout is Sunday the 23rd—a week and a half out. Swell jumps to 8ft from the S with a 9-second period and big energy (1818). Light cross-off wind, clean. That’s a powerful wave. Saturday the 22nd has some clean but smaller surf as a warm-up.
Monday the 24th and Thursday the 27th offer glassy mornings. Monday the 24th has 4ft of S swell—clean, small, good for a fun session. Thursday the 27th afternoon has 6ft S swell with zero wind—absolutely glassy. That’s a hidden gem in this forecast.
Best session by far is Sunday the 23rd morning. Big, clean, powerful. Thursday the 27th afternoon is the glassy dark horse.
Rusty.
Short Range ForecastHeavy rain (total 42mm), heaviest during Fri night. Very mild (max 19°C on Sat morning, min 15°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Sun morning. Warm (max 25°C on Mon morning, min 14°C on Tue afternoon). Mainly fresh winds. | ||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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) | SSE 12 | S 14 | S 13 | SSE 13 | SSE 13 | SSE 13 | S 12 | E 8 | E 8 | ENE 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | S 8 | S 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 992 | 1576 | 1283 | 1323 | 1127 | 1452 | 786 | 471 | 320 | 419 | 329 | 612 | 699 | 626 | 732 | 606 | 351 | 459 | 275 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross-on | cross | cross | cross-on | cross | cross-off | cross-off | cross-off |
High Tide | 1:04AM0.60m | 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 | |||||||
Low Tide | 9:02PM0.35m | 8:57AM-0.08m | 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 | ||||||
 |  |  |  | |  | |  | |  | | | |  |  | | | | | |
 | — | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | 6:43 | — | — |
 | — | — | 5:51 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — |
mm | 1 | — | 4 | 11 | 4 | 7 | 11 | 2 | 2 | — | 3 | 1 | — | — | — | — | — | — | — |
Temp °C | 16 | 18 | 17 | 17 | 18 | 18 | 18 | 19 | 19 | 18 | 20 | 19 | 19 | 25 | 24 | 20 | 15 | 15 | 15 |
Feels °C | 16 | 18 | 16 | 18 | 18 | 19 | 18 | 19 | 18 | 17 | 19 | 18 | 18 | 24 | 22 | 20 | 11 | 11 | 15 |
Swell 1 Height (m) Direction Period (s) | SSE 12 | S 14 | S 13 | SSE 13 | SSE 13 | SSE 13 | ESE 8 | E 8 | E 8 | SSE 11 | E 8 | SSE 10 | S 10 | SSE 10 | SSE 11 | ENE 9 | ENE 9 | ENE 9 | S 8 |
| kJ | 992 | 1576 | 1283 | 1323 | 1127 | 1452 | 449 | 409 | 320 | 153 | 329 | 83 | 75 | 19 | 24 | 606 | 351 | 254 | 275 |
Swell 2 Height (m) Direction Period (s) | E 7 | NE 5 | ENE 5 | NE 6 | — | SE 7 | S 12 | S 12 | S 11 | S 11 | SSE 10 | S 10 | — | SSE 12 | — | S 11 | — | — | ENE 9 |
| kJ | 1 | 10 | 10 | 8 | — | 118 | 786 | 456 | 297 | 227 | 108 | 104 | — | 29 | — | 20 | — | — | 222 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | E 14 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 15 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 5 | — | — | NE 6 | ESE 7 | ESE 7 | E 8 | E 8 | NNE 6 | ENE 8 | NE 5 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | SW 3 | S 6 | S 8 | — |
| kJ | 22 | — | — | 11 | 180 | 247 | 604 | 471 | 111 | 419 | 55 | 612 | 699 | 626 | 732 | 2 | 171 | 459 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 4 | 0 | 7 | 12 | 2 | 2 | 2 | 2 | 12 | 12 | 63 | 2 | 71 | 63 | 2 | 2 | 85 | 7 | 0 |
Best forecast wave conditions in Santa Catarina - Sul | |||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||
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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.
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