Surf Forecasts:
Rosa surf forecast from 28 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 6PM (local time) - 11ft (3.5m), 11s period, SSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 1 Sep, 9PM (local time) - 13ft (4.0m), 11s period, S swell with 4,093 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 9PM (local time) - 5.5ft (1.7m), 8s period with ENE 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 Friday (Aug 28) at 9PM. The primary swell is predicted to be 1.7m and 8s period with a secondary swell of 0.4m and 11s. 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 4.0m 11s and forecast to arrive on Tuesday (Sep 01) at 9PM. 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 Friday (Sep 04) at 6PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 28th Aug) | 5.5ft (1.7m) 8s |
| Best Surf | 6PM (Tue 1st Sep) | 11ft (3.5m) 11s |
| Most Powerful | 9PM (Tue 1st Sep) | 13ft (4.0m) 11s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what Rosa’s got for us over these next couple weeks.
Right off the bat, the pattern is mixed. We’ve got some solid energy, but the wind windows are the real story. Water temp is about 64°F, which is a little over a degree cooler than usual for the time of year – a bit chillier than normal, so plan for an extra layer.
First real chance to paddle out is Saturday morning, August 29. Clean cross-off breeze from the SW, with waves around 5ft from the ENE, 8 seconds between sets. The energy is moderate (338), and the conditions will be clean. Good warm-up.
Sunday morning, August 30, is the early standout. Offshore wind from the WNW at around 6 mph. That’s a huge plus – the waves will be glassy. Swell drops to about 4ft from the ENE, still at 8 seconds. The energy is light to moderate (241), but the clean face will make it feel better. That’s the one to hit for a fun, mellow session.
Then there’s a dry spell from Monday, August 31 through Thursday, September 3. Cross-shore winds, chop, and poor quality. Not worth the effort.
Wednesday, September 2 morning brings a massive 12ft S swell at 11 seconds, with strong energy (4228). This is too big for Rosa – expert territory only. The wind is cross-off, so the face might hold, but the size will shut it down for most.
Best session of the whole outlook? Sunday, September 6 morning. A 7ft SSE swell at 11 seconds, with a light cross-off breeze from the SSW. Energy is strong (1121), and conditions are excellent. The swell direction lines up perfectly with Rosa’s best. Expect some company in the water – it can get a crowd sometimes.
Tuesday, September 8 morning is another clean one. A smaller 4ft S swell, 11-second period, with glassy offshore wind from the W. Energy is weak to moderate (386), but the clean surface will make it fun.
The end of the run gets big again. Friday, September 11 morning has a massive 12ft SSE swell with a 13-second period and energy over 4000 (4082). But the cross-on wind and the size mean it’s only for the very experienced.
Bottom line: Sunday August 30 morning for clean waves, and Sunday September 6 morning is the absolute best of the 16 days. Mark that one.
Rusty.
Short Range ForecastHeavy rain (total 41mm), heaviest during Mon morning. Warm (max 28°C on Fri afternoon, min 17°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Mon afternoon. Warm (max 20°C on Mon afternoon, min 12°C on Tue night). Winds decreasing (fresh winds from the SSW on Tue afternoon, calm by Wed night). | |||||||||||||||||||
Fri 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | ||||||||||||||
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) | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | ENE 9 | ENE 9 | ESE 8 | ENE 9 | SSW 8 | S 11 | S 11 | S 10 | SSE 9 | SE 10 | SE 9 | SE 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 589 | 343 | 313 | 256 | 211 | 197 | 223 | 338 | 311 | 218 | 165 | 157 | 581 | 3113 | 2445 | 1316 | 614 | 354 | 212 | 117 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross | cross-off | off | cross-on | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross | cross-on | cross |
High Tide | 1:56AM0.71m | 2:49PM0.64m | 2:29AM0.72m | 3:10PM0.61m | 3:03AM0.71m | 3:32PM0.57m | 3:40AM0.67m | 3:55PM0.52m | 10:23PM0.25m | 4:21AM0.61m | 4:16PM0.47m | 11:17PM0.27m | 5:09AM0.54m | 4:34PM0.42m | 11:46PM0.30m | |||||
Low Tide | 8:54PM0.23m | 9:11AM-0.03m | 9:22PM0.23m | 9:48AM0.03m | 9:51PM0.23m | 10:30AM0.12m | 10:20PM0.24m | 11:25AM0.22m | 8:38PM0.25m | 9:00AM0.38m | 12:42PM0.32m | 8:31PM0.23m | 8:18AM0.43m | 2:21PM0.39m | 8:45PM0.21m | |||||
 |  | |  |  | |  | |  | |  |  | |  | | | | | | | |
 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — |
 | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — |
mm | 2 | 2 | 2 | — | 6 | 3 | 2 | 5 | 19 | 2 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 18 | 18 | 20 | 18 | 19 | 20 | 19 | 20 | 20 | 19 | 20 | 20 | 15 | 17 | 17 | 13 | 19 | 20 | 15 |
Feels °C | 27 | 18 | 20 | 21 | 18 | 20 | 21 | 19 | 20 | 20 | 19 | 14 | 14 | 10 | 12 | 13 | 13 | 16 | 16 | 12 |
Swell 1 Height (m) Direction Period (s) | SSE 11 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SSE 5 | E 8 | ENE 9 | ENE 9 | ESE 8 | ESE 8 | ENE 9 | ENE 10 | S 11 | SSE 10 | SSE 9 | SE 10 | SE 9 | SE 9 |
| kJ | 68 | 343 | 313 | 256 | 211 | 197 | 22 | 338 | 311 | 218 | 165 | 123 | 151 | 118 | 1693 | 1086 | 614 | 354 | 212 | 117 |
Swell 2 Height (m) Direction Period (s) | — | SSE 10 | SE 10 | SSE 10 | SSE 5 | SSE 6 | SSE 10 | — | SSE 6 | SE 7 | ENE 9 | ENE 9 | SE 8 | — | ENE 10 | ENE 10 | ENE 9 | S 9 | S 8 | S 9 |
| kJ | — | 42 | 25 | 20 | 55 | 34 | 9 | — | 49 | 102 | 161 | 157 | 59 | — | 90 | 56 | 50 | 95 | 65 | 99 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SSE 10 | SSE 10 | S 8 | — | SSE 8 | E 8 | S 8 | — | SSE 10 | — | — | — | ENE 9 | ENE 9 | S 11 | ENE 9 |
| kJ | — | — | — | — | 9 | 10 | 1 | — | 6 | 54 | 1 | — | 9 | — | — | — | 58 | 32 | 9 | 25 |
Wind waves Height (m) Direction Period (s) | NE 8 | SW 3 | SSW 4 | SSW 4 | — | — | E 8 | — | — | — | — | SW 2 | SSW 8 | S 11 | S 11 | S 10 | — | — | NE 9 | NNE 4 |
| kJ | 589 | 1 | 7 | 3 | — | — | 223 | — | — | — | — | 1 | 581 | 3113 | 2445 | 1316 | — | — | 95 | 20 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 25 | 0 | 0 | 11 | 0 | 0 | 2 | 2 | 6 | 25 | 0 | 29 | 85 | 2 | 2 | 24 | 0 | 2 | 2 | 4 |
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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