
Surf Forecasts:
Rosa surf forecast from 15 Sep 2026:
- Best quality surf: Monday 21 Sep, 12AM (local time) - 10ft (3.0m), 9s period, NE swell with cross-offshore winds.
- Most powerful swell: Monday 21 Sep, 12AM (local time) - 10ft (3.0m), 9s period, NE swell with 1,283 kJ wave energy.
- Next surfable swell (1★+): Tuesday 15 Sep, 3AM (local time) - 3.5ft (1.1m), 8s 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 Tuesday (Sep 15) at 3AM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.9m 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 3.0m 9s and forecast to arrive on Monday (Sep 21) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Tuesday (Sep 15) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Tue 15th Sep) | 3.5ft (1.1m) 8s |
| Best Surf | 12AM (Mon 21st Sep) | 10ft (3.0m) 9s |
| Most Powerful | 12AM (Mon 21st Sep) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at what Rosa has in store for us over the next 16 days. To be straight with you, we’re in for a bit of a frustrating wait. The first several days are filled with onshore chop and poor conditions, so we’ve got a real dry spell before things start to turn.
The first chance of a decent wave comes on Tuesday morning, September 15th. We’re looking at a small, clean 3ft swell from the south, with a light cross-offshore wind from the SSW. The period is a modest 10 seconds, so there’s a bit of shape to it. The combined swell energy is weak (284), so it won’t be powerful, but with those clean conditions, it’s a session for the log or a longboard. Expect good surf conditions, even though it’s not pumping.
Things get a little better on Wednesday morning, the 16th. Similar winds, still light and cross-off, but the swell is a touch bigger at 4ft from the south. The period drops to 7 seconds, which is short-period wind swell. It’ll be fun and clean, but don’t expect a ton of grunt. The energy is still weak (285).
Now, here’s where the real standouts pop up, but you’ll have to be patient. The absolute best of the bunch is shaping up for Monday morning, September 21st. The winds go *glass* – dead calm, that’s a major positive. We’ve got a solid 7ft swell from the ENE with a 9-second period. The energy jumps to a moderate level (674), so there’s some push behind it. That’s a heavy-sounding 7ft for an intermediate spot, but with glassy conditions it could clean up nicely. This is one to circle on the calendar.
Then, a full week later, on Monday morning, September 28th, we get another banger. Again, glassy winds, but this time a 7ft groundswell from the south with a 9-second period. The energy is strong (805). This has the makings of a real day out, but it's a long way off, so treat it as promising but not locked in. The afternoon of the same day sees the swell jump to 10ft from the south with energy going nuclear (1718), but that’s too much grunt for this break. That one’s for experts only, if anyone can get in.
Between those two highlights, there are a few other mornings that look alright. Wednesday morning, September 23rd, offers clean waves at 6ft from the SSE with a cross-offshore breeze, a good option if you missed the Monday. And Friday morning, September 25th, has clean 3ft from the ESE. Nothing to cancel work for, but fun if you’re keen.
Between the 16th and the 21st, there's a run of poor to marginal conditions. It might be worth waiting for the real windows.
Alright, that’s the long and short of it from Rosa. Keep an eye on that Monday the 21st and Monday the 28th. Surf’s gotta get clean sometime.
Rusty.
Short Range ForecastSome drizzle, heaviest during Mon night. Very mild (max 18°C on Tue morning, min 13°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 35mm), heaviest during Sat night. Warm (max 23°C on Sun afternoon, min 15°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||
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 8 | S 10 | S 10 | S 12 | S 10 | S 8 | S 10 | S 8 | S 11 | S 10 | S 10 | SSE 9 | S 9 | ENE 7 | NE 7 | NE 7 | NE 8 | ENE 8 | NE 9 |
Wave Graph | |||||||||||||||||||
173 | 161 | 167 | 271 | 131 | 278 | 600 | 167 | 396 | 296 | 196 | 144 | 81 | 256 | 212 | 237 | 587 | 620 | 1283 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | cross | cross-off | cross-off | cross | cross-off | cross | cross-on | cross-off | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off |
High Tide | 3:14AM0.67m | 3:09PM0.58m | 3:54AM0.62m | 3:34PM0.56m | 4:36AM0.55m | 4:00PM0.53m | 5:28AM0.47m | 12:05PM0.52m | 00:14AM0.27m | 6:57AM0.41m | 12:22PM0.56m | 00:05AM0.32m | 12:37PM0.59m | 7:25PM0.38m | |||||
Low Tide | 8:18AM0.31m | 8:10PM0.14m | 8:04AM0.34m | 8:33PM0.14m | 8:14AM0.37m | 12:59PM0.47m | 8:59PM0.17m | 8:22AM0.39m | 2:57PM0.47m | 9:25PM0.22m | 8:02AM0.40m | 9:47PM0.29m | 3:48AM0.21m | 5:38PM0.37m | 9:42PM0.37m | ||||
— | 6:11 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — | |
6:06 | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:08 | — | |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | 3 | 4 | 4 | 22 | 2 | — | — |
Temp °C | 14 | 18 | 16 | 15 | 17 | 16 | 14 | 18 | 18 | 16 | 18 | 17 | 18 | 18 | 18 | 19 | 20 | 23 | 20 |
Feels °C | 14 | 16 | 14 | 14 | 13 | 12 | 12 | 15 | 14 | 14 | 16 | 16 | 17 | 16 | 16 | 18 | 21 | 23 | 21 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 10 | SE 8 | S 12 | S 7 | E 8 | S 10 | S 8 | S 11 | S 10 | S 10 | SSE 9 | E 6 | S 9 | E 7 | E 7 | S 12 | S 12 | ENE 9 |
173 | 161 | 132 | 271 | 131 | 41 | 600 | 167 | 396 | 296 | 196 | 144 | 79 | 56 | 92 | 142 | 25 | 25 | 878 | |
Swell 2 Height (m) Direction Period (s) | SE 8 | SE 7 | S 10 | SE 8 | S 10 | SSE 14 | E 7 | S 11 | E 7 | E 6 | E 6 | ESE 9 | S 9 | S 13 | S 9 | S 12 | — | S 8 | S 11 |
107 | 89 | 167 | 55 | 115 | 68 | 27 | 60 | 17 | 38 | 54 | 17 | 81 | 14 | 38 | 25 | — | 1 | 9 | |
Swell 3 Height (m) Direction Period (s) | E 8 | E 8 | E 8 | E 7 | E 7 | SE 8 | E 12 | E 8 | E 11 | E 7 | E 10 | — | S 14 | SE 11 | S 13 | SSE 8 | — | — | — |
36 | 34 | 33 | 54 | 39 | 14 | 11 | 18 | 9 | 8 | 17 | — | 4 | 5 | 30 | 6 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | S 4 | S 6 | — | S 8 | — | — | NE 2 | N 3 | ENE 6 | ENE 6 | NE 6 | ENE 7 | NE 7 | NE 7 | NE 8 | ENE 8 | NE 9 |
— | — | 19 | 25 | — | 278 | — | — | 1 | 6 | 64 | 90 | 68 | 256 | 212 | 237 | 587 | 620 | 1283 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 2 | 0 | 0 | 24 | 0 | 4 | 12 | 0 | 4 | 4 | 2 | 2 | 2 | 297 | 2 | 2 | 2 |
Best forecast wave conditions in Santa Catarina - Sul | |||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










