
Surf Forecasts:
Rosa surf forecast from 10 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 12AM (local time) - 6ft (1.9m), 7s period, S swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 12AM (local time) - 7ft (2.2m), 13s period, S swell with 1,581 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 6PM (local time) - 3.5ft (1.1m), 14s 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 (Sep 10) at 6PM. The primary swell is predicted to be 1.1m and 14s period with a secondary swell of 1.1m and 8s. 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 (Sep 17) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 5s period and expected on Saturday (Sep 12) at 12AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Thu 10th Sep) | 3.5ft (1.1m) 14s |
| Best Surf | 12AM (Wed 16th Sep) | 6ft (1.9m) 7s |
| Most Powerful | 12AM (Thu 17th Sep) | 7ft (2.2m) 13s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
Alright, let’s get into it. This is Rusty, and I’m looking at the next couple of weeks for Rosa. The surf here is a bit of a mixed bag, but there are definitely some windows to get excited about.
We’ve got a bit of a wait for the first real green light. Thursday morning, the 10th of September, is the first decent call. The water's sitting at 62°F, which is a good 4° colder than it should be for this time of year – that’s a notable chill, so bring a good wetsuit. But the conditions are glassy with a light NNE breeze at 3 mph, and we’ve got a tidy 3 ft south swell with a long 12-second period. The combined energy is moderate at 551, and it’s coming from the south, which is right in the sweet spot for Rosa. Expect clean, fun waves. This is a standout for the near term.
Friday, the 11th, is a step down. The morning is a bit of a mess with light rain and a cross-shore wind, but if you’re keen, the best part of the day is the afternoon. That’s when the wind goes light cross-offshore, the swell jumps to 5 ft from the northeast, and the energy picks up. It’s not perfect, but it’s surfable.
Saturday the 12th and Sunday the 13th see a stronger, consistent south swell pushing through. Saturday morning has 7 ft south swell with a 12 mph southwest cross-offshore wind. The energy is solid (632), but that wind is a bit punchy. The waves will be clean enough, but it’s getting bigger – 7 ft is pushing into intermediate territory. Sunday is a touch smaller at 5 ft but still clean. It’s consistent, but not the best in the window.
There’s a lull in quality from Monday the 14th through to the middle of the week. Winds are onshore or cross-onshore, and the swell is messy. There’s a brief return to glassy conditions on the morning of Saturday the 19th, with a 4 ft easterly swell, but it’s short-lived and the energy is weak.
Now, the real standout for the long range is late in the forecast. Wednesday the 23rd of September is looking tasty. The morning is glassy, with a 6 ft south swell at 12 seconds, and a combined energy of 943. That’s a solid, moderate-to-strong pulse. The wind is glassy. This is the best-looking swell in the fortnight, but remember, it’s a week and a half away, so keep an eye on it.
Be careful on Friday the 25th. The morning is showing a massive 13 ft east swell with a 9-second period, and the energy is off the charts at 3009. That is way too big for Rosa – expert-only, and even then, it’s going to be a washing machine. The afternoon is slightly smaller at 12 ft, but still huge. This setup looks more interesting for kite surfing than paddle surfing.
Overall, the best bets are Thursday the 10th morning for super clean, fun waves, and the long-range glassy window on Wednesday the 23rd morning. The rest is a mix of average conditions and poor windows. The crowds at Rosa can be around sometimes, so keep that in mind for the good sessions.
- Rusty
Short Range ForecastHeavy rain (total 43mm), heaviest during Fri afternoon. Warm (max 20°C on Thu morning, min 14°C on Sat night). Winds increasing (calm on Thu morning, fresh winds from the SW by Fri night). | Days 4-6 Weather SummaryHeavy rain (total 37mm), heaviest during Sun night. Very mild (max 19°C on Tue morning, min 13°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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 12 | S 14 | S 13 | ENE 8 | NE 7 | ENE 7 | S 8 | S 9 | SSE 9 | SSE 8 | SE 8 | SE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | E 8 | S 7 | S 8 | S 11 | S 13 |
Wave Graph | |||||||||||||||||||||
225 | 503 | 268 | 138 | 229 | 134 | 552 | 627 | 522 | 323 | 222 | 242 | 254 | 340 | 475 | 509 | 438 | 392 | 447 | 1029 | 1581 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | on | cross | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross | cross-on | on | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-on |
High Tide | 2:32PM0.61m | 00:53AM0.66m | 2:04PM0.57m | 1:26AM0.71m | 2:08PM0.57m | 2:01AM0.72m | 2:24PM0.58m | 2:37AM0.71m | 2:45PM0.58m | 3:14AM0.67m | 3:09PM0.58m | 3:54AM0.62m | 3:34PM0.56m | ||||||||
Low Tide | 8:15PM0.28m | 8:29AM-0.03m | 8:38PM0.26m | 9:03AM0.03m | 8:57PM0.23m | 9:35AM0.12m | 9:05PM0.20m | 10:03AM0.22m | 8:01PM0.17m | 8:18AM0.31m | 8:10PM0.14m | 8:04AM0.34m | 8:33PM0.14m | ||||||||
6:18 | — | — | 6:16 | — | — | 6:16 | — | — | 6:15 | — | — | 6:13 | — | — | 6:11 | — | — | 6:11 | — | — | |
— | 6:04 | — | — | 6:05 | — | — | 6:05 | — | — | 6:06 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | |
mm | — | 2 | 10 | 8 | 21 | 1 | — | — | 1 | — | — | 15 | 8 | 5 | 9 | — | — | — | — | — | — |
Temp °C | 20 | 19 | 18 | 20 | 20 | 18 | 18 | 18 | 16 | 17 | 16 | 16 | 16 | 16 | 16 | 19 | 18 | 15 | 16 | 16 | 15 |
Feels °C | 22 | 20 | 20 | 21 | 22 | 20 | 14 | 15 | 14 | 15 | 15 | 15 | 14 | 16 | 17 | 16 | 14 | 12 | 12 | 13 | 14 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | S 14 | ENE 8 | S 12 | S 11 | ENE 7 | ENE 8 | ENE 8 | SSE 9 | SSE 8 | SE 8 | SE 8 | SE 8 | S 11 | ENE 8 | ENE 8 | E 8 | S 7 | S 8 | S 11 | S 13 |
130 | 503 | 131 | 136 | 90 | 134 | 69 | 67 | 522 | 323 | 222 | 242 | 108 | 291 | 475 | 509 | 438 | 261 | 346 | 1029 | 1581 | |
Swell 2 Height (m) Direction Period (s) | S 12 | ENE 8 | S 13 | ESE 13 | S 6 | E 12 | E 12 | ESE 12 | ENE 8 | ENE 8 | ENE 8 | S 9 | S 9 | SE 8 | S 11 | S 11 | S 11 | E 9 | E 8 | E 8 | E 8 |
225 | 127 | 268 | 17 | 3 | 12 | 11 | 14 | 53 | 59 | 78 | 201 | 123 | 71 | 149 | 149 | 181 | 299 | 140 | 88 | 66 | |
Swell 3 Height (m) Direction Period (s) | SSE 16 | SE 8 | E 14 | S 7 | ESE 13 | — | — | — | E 12 | S 16 | S 7 | ENE 8 | S 12 | — | SE 8 | SE 9 | SE 8 | S 10 | ESE 8 | — | E 12 |
196 | 2 | 15 | 4 | 17 | — | — | — | 3 | 5 | 28 | 58 | 130 | — | 86 | 37 | 22 | 102 | 7 | — | 3 | |
Wind waves Height (m) Direction Period (s) | — | — | — | ENE 8 | NE 7 | SSW 5 | S 8 | S 9 | — | — | — | — | ENE 7 | ENE 7 | — | — | S 11 | S 7 | S 8 | — | — |
— | — | — | 138 | 229 | 92 | 552 | 627 | — | — | — | — | 254 | 340 | — | — | 387 | 392 | 447 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 2 | 2 | 2 | 0 | 85 | 2 | 24 | 2 | 0 | 2 | 2 | 136 | 2 | 0 | 2 | 880 | 0 | 2 | 7 | 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.










