Surf Forecasts:
Rosa surf forecast from 12 Aug 2026:
- Best quality surf: Thursday 13 Aug, 3AM (local time) - 5ft (1.5m), 12s period, S swell with offshore winds.
- Most powerful swell: Thursday 13 Aug, 9PM (local time) - 7ft (2.2m), 13s period, S swell with 1,631 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 12AM (local time) - 5.5ft (1.7m), 12s 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 12AM. The primary swell is predicted to be 1.7m and 12s period with a secondary swell of 0.9m 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 2.2m 13s and forecast to arrive on Thursday (Aug 13) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Tuesday (Aug 18) at 9AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Thu 13th Aug) | 5.5ft (1.7m) 12s |
| Best Surf | 3AM (Thu 13th Aug) | 5ft (1.5m) 12s |
| Most Powerful | 9PM (Thu 13th Aug) | 7ft (2.2m) 13s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's on the cards.
We've got a bit of a slow start ahead, but some real gems coming for Rosa. The water is sitting right about average for this time of year, not too warm, not too chilly.
The first real chance to get wet kicks off on Thursday, the 13th of August. The morning is the pick with a solid 7 ft S swell rolling in at a proper 14 seconds. That’s some long-period groundswell that will wrap in nicely. The wind is a clean cross-offshore from the SW, so expect clean faces. The combined energy is strong (1598), so there's plenty of push. This is for experienced surfers only at that size, but it's a standout window. The afternoon holds similar quality with the same 7 ft swell, though the period drops a bit to 13 seconds.
Skip the weekend into Monday. Sunday the 16th and Monday the 17th see the swell direction shift to the east and the period drops into the short-range junk zone (8 seconds). The wind gets messy, and the quality goes out the window. It’s a write-off for paddle surfing.
Now, here’s another beauty to circle. Tuesday the 18th of August morning has clean 6 ft ENE swell, a 9-second period, and glassy conditions with that NNE breeze at just 5 km/h. The combined energy is moderate (578), but the wind will have the surface like a mirror. This is a great session for the intermediate crew.
The next really good window opens up on Monday the 24th and Tuesday the 26th of August. Monday the 24th has a clean, glassy morning with 5 ft S swell and a 14-second period. The afternoon is the real standout though – 5 ft S groundswell at 14 seconds, with glassy conditions (981). Excellent for experienced surfers. Tuesday the 26th is another cracker with a glassy 5 ft S swell at 14 seconds. Excellent conditions for those who know what they're doing.
Overall, the first week is touch and go with only a couple of clean sessions. The second week looks more promising, with those Monday and Tuesday morning windows being the true standouts. Keep an eye on the forecast for those.
- Rusty
Short Range ForecastHeavy rain (total 42mm), heaviest during Thu morning. Very mild (max 17°C on Thu morning, min 12°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 44mm), heaviest during Fri night. Warm (max 25°C on Mon morning, min 17°C on Fri afternoon). Wind will be generally light. | |||||||||||||||||||
Tue 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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 12 | S 12 | SSE 12 | S 12 | S 12 | S 14 | S 13 | SSE 13 | S 13 | SSE 13 | S 12 | S 12 | S 11 | E 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 9 | NE 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1122 | 1290 | 1064 | 956 | 870 | 1576 | 1440 | 1451 | 957 | 1162 | 773 | 464 | 302 | 216 | 187 | 377 | 521 | 574 | 716 | 924 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | cross | cross-off | cross-off | cross-off | on | on | on | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross-on | cross |
High Tide | 3:20PM0.73m | 00:37AM0.52m | 3:50PM0.67m | 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 | |||||||
Low Tide | 8:37PM0.33m | 8:17AM-0.09m | 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 | |||||||
 |  |  |  |  | |  |  | | | |  | | | | | | | | | |
 | — | — | 6:48 | — | — | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — |
 | 5:50 | — | — | 5:50 | — | — | 5:51 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — |
mm | — | 3 | 4 | — | — | 5 | 10 | 16 | 4 | 8 | 28 | 1 | — | — | 6 | 1 | — | — | — | — |
Temp °C | 14 | 13 | 14 | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 18 | 20 | 19 | 19 | 19 | 20 | 20 | 25 | 25 | 19 |
Feels °C | 13 | 12 | 12 | 15 | 16 | 17 | 17 | 17 | 17 | 16 | 16 | 20 | 18 | 18 | 19 | 22 | 20 | 24 | 25 | 20 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 12 | SSE 12 | S 12 | S 12 | S 14 | S 13 | SSE 13 | S 13 | SSE 13 | ESE 7 | E 8 | ESE 8 | E 8 | E 8 | S 10 | S 10 | S 10 | SSE 10 | ENE 9 |
| kJ | 1122 | 1290 | 1064 | 956 | 870 | 1576 | 1440 | 1451 | 957 | 1162 | 414 | 287 | 196 | 216 | 187 | 102 | 75 | 53 | 36 | 630 |
Swell 2 Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 7 | — | — | NE 5 | NE 6 | NE 6 | NE 6 | — | S 12 | S 12 | S 11 | S 11 | S 10 | S 10 | — | — | E 8 | S 10 |
| kJ | 12 | 11 | 5 | — | — | 22 | 15 | 18 | 19 | — | 773 | 464 | 302 | 184 | 102 | 133 | — | — | 21 | 19 |
Swell 3 Height (m) Direction Period (s) | NE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | E 14 | E 14 | — | — | — | — |
| kJ | 16 | — | — | — | — | — | — | — | — | — | — | — | — | — | 14 | 15 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | NNE 3 | NNE 4 | NNE 5 | — | — | — | ESE 7 | ESE 7 | — | — | NE 4 | NNE 4 | NNE 4 | E 8 | ENE 8 | ENE 8 | ENE 9 | NE 9 |
| kJ | — | — | 6 | 34 | 44 | — | — | — | 224 | 220 | — | — | 44 | 34 | 42 | 377 | 521 | 574 | 716 | 924 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 6 | 4 | 4 | 4 | 0 | 0 | 0 | 12 | 2 | 2 | 2 | 2 | 12 | 12 | 12 | 2 | 2 | 25 | 2 | 2 |
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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