Surf Forecasts:
Rosa surf forecast from 1 Sep 2026:
- Best quality surf: Wednesday 2 Sep, 12AM (local time) - 7ft (2.1m), 8s period, SE swell with cross-offshore winds.
- Most powerful swell: Tuesday 1 Sep, 9PM (local time) - 8ft (2.4m), 8s period, SE swell with 754 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 3AM (local time) - 3.5ft (1.1m), 8s period with ESE 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 Tuesday (Sep 01) at 3AM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.8m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Rosa in the next 16 days are 2.4m 8s 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 6s period and expected on Friday (Sep 04) at 3AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Tue 1st Sep) | 3.5ft (1.1m) 8s |
| Best Surf | 12AM (Wed 2nd Sep) | 7ft (2.1m) 8s |
| Most Powerful | 9PM (Tue 1st Sep) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
Alright, Rusty here. Let's cut through the noise and look at what Rosa has in store for us over the next couple of weeks.
Right off the bat, we've got a bit of a slow start. The first couple of days are a write-off, but hang tight, because things start to shape up from Wednesday the 2nd. The water is sitting right around average for the time of year, so no surprises there.
The real standout window kicks off on Wednesday morning, September 2nd. We’re looking at a clean 6 ft swell rolling in from the SE, with a 9-second period, and the wind is light and cross-offshore. The combined energy is moderate at 596, and it’s expected to deliver very good surf. This is the one to point your board at for a solid session.
The next real highlight is further out, on Saturday morning, September 12th. It’s glassy, dead calm, with a 5 ft swell from the east at 9 seconds. The energy is 429. It’s a classic morning session – clean, no wind, and decent waves. Not the biggest, but the conditions will make it feel like a dream.
Now, for the big dogs. Thursday afternoon, September 10th, brings a massive 10 ft NE swell with a short 8-second period, but the wind is clean and cross-offshore. The combined energy is a whopping 2045. This is expert territory only – that size is serious and will be a handful. But if you’ve got the skill, it’s a raw, powerful beast.
Then, on Monday morning, September 14th, we have a 7 ft SE swell and a 10-second period with light, cross-onshore winds. The energy is 1059. It’s a good size for strong intermediates, but the wind is a bit messy.
The absolute best of the best, though, is Tuesday morning, September 15th. We get a 6 ft SE groundswell with a very long 12-second period, and the wind is glassy from the WNW. The energy is a solid 1197. This is a clean, powerful, long-period groundswell, and it’s excellent for experienced surfers. The long period means it will be better shaped and more powerful, but it might be a bit straight for the beach breaks, so hunt for a point or a reef if you can.
Crowds at Rosa are sometimes a thing, so you might have some company on the best days. Overall, the first week has a couple of solid, clean options, and the second week brings a couple of standout, bigger days. The run from the 3rd to the 9th is pretty average, with small, weak, or messy conditions, so pick your windows.
Rusty out.
Short Range ForecastHeavy rain (total 26mm), heaviest during Mon afternoon. Warm (max 22°C on Thu morning, min 13°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Sat night. Warm (max 23°C on Thu afternoon, min 14°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Mon 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | ||||||||||||||
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) | ENE 9 | ESE 8 | ESE 8 | SE 8 | SE 8 | SE 9 | SE 9 | SE 10 | SE 11 | SE 11 | SE 11 | SE 10 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 8 | S 7 | S 7 | S 8 |
Wave Graph | ||||||||||||||||||||
222 | 212 | 307 | 437 | 589 | 450 | 492 | 500 | 361 | 286 | 191 | 89 | 114 | 149 | 157 | 122 | 122 | 85 | 142 | 364 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-on | cross | cross | cross-on | cross | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off |
High Tide | 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 | 6:19AM0.45m | 00:12AM0.32m | 12:31PM0.69m | 00:35AM0.35m | 1:10PM0.74m | 00:51AM0.39m | ||||
Low Tide | 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 | 7:57AM0.44m | 9:04PM0.22m | 3:27AM0.21m | 9:23PM0.26m | 4:42AM0.13m | 9:19PM0.31m | |||||
— | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — | 6:24 | — | — | 6:22 | — | — | |
6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:02 | — | |
mm | 9 | 12 | 3 | 2 | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 | 2 | — | — | — |
Temp °C | 19 | 18 | 18 | 17 | 16 | 18 | 17 | 15 | 22 | 23 | 17 | 20 | 18 | 15 | 15 | 15 | 15 | 17 | 16 | 13 |
Feels °C | 20 | 19 | 17 | 16 | 14 | 16 | 16 | 14 | 19 | 19 | 15 | 19 | 16 | 13 | 14 | 14 | 14 | 13 | 11 | 9 |
Swell 1 Height (m) Direction Period (s) | ENE 9 | ESE 8 | ESE 8 | ENE 8 | SE 8 | SE 9 | SE 9 | SE 10 | SE 11 | SE 11 | SE 11 | NE 6 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 8 |
222 | 212 | 307 | 39 | 589 | 450 | 492 | 500 | 361 | 286 | 191 | 51 | 114 | 149 | 157 | 122 | 90 | 68 | 49 | 364 | |
Swell 2 Height (m) Direction Period (s) | ESE 8 | ENE 8 | ENE 8 | — | — | ENE 9 | ENE 9 | ENE 9 | ENE 9 | S 11 | ENE 9 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | S 13 | S 12 | S 12 | ENE 7 |
137 | 90 | 84 | — | — | 146 | 156 | 119 | 70 | 2 | 65 | 89 | 65 | 35 | 24 | 14 | 29 | 24 | 24 | 21 | |
Swell 3 Height (m) Direction Period (s) | SSE 6 | — | ESE 10 | — | — | — | — | — | S 8 | S 8 | S 10 | ENE 8 | S 9 | S 9 | S 15 | S 14 | ESE 9 | SE 10 | S 10 | E 8 |
22 | — | 10 | — | — | — | — | — | 1 | 1 | 2 | 54 | 2 | 2 | 4 | 16 | 9 | 4 | 2 | 12 | |
Wind waves Height (m) Direction Period (s) | — | — | — | SE 8 | — | — | — | NNE 3 | NNE 4 | NE 5 | NNE 6 | — | SSW 4 | S 5 | S 6 | S 7 | S 8 | S 7 | S 7 | — |
— | — | — | 437 | — | — | — | 3 | 13 | 119 | 87 | — | 11 | 28 | 48 | 62 | 122 | 85 | 142 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 2 | 2 | 2 | 2 | 0 | 0 | 24 | 34 | 25 | 2 | 2 | 0 | 24 | 0 | 0 | 0 | 0 | 7 | 24 | 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.











