Surf Forecasts:
Rosa surf forecast from 16 Aug 2026:
- Best quality surf: Sunday 23 Aug, 12AM (local time) - 6ft (1.9m), 12s period, S swell with cross-offshore winds.
- Most powerful swell: Sunday 23 Aug, 3AM (local time) - 6ft (1.9m), 12s period, S swell with 1,036 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 6PM (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 Tuesday (Aug 18) at 6PM. The primary swell is predicted to be 1.7m and 8s period with a secondary swell of 0.2m and 10s. 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 1.9m 12s and forecast to arrive on Sunday (Aug 23) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Sunday (Aug 23) at 3PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Tue 18th Aug) | 5.5ft (1.7m) 8s |
| Best Surf | 12AM (Sun 23rd Aug) | 6ft (1.9m) 12s |
| Most Powerful | 3AM (Sun 23rd Aug) | 6ft (1.9m) 12s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's talk about what Rosa's got in store.
The first few days are a bust. We’re looking at a 6 to 7 foot swell from the ENE with a short 8 second period, but it's all blown out by cross-onshore wind. The wave energy sits in the moderate range, around the 600s, but the ocean is a mess. You’d be better off staying home.
Wednesday morning the 19th of August finally shows a glimmer. The swell drops to 4 feet from the ENE, but a light offshore from the SSW cleans it right up. The energy is weak at 200, but at least it’s not choppy.
Then we get a couple of days of junk before the real stuff arrives. Saturday the 22nd of August morning is your first real call: a clean 6 foot S swell with a 9 second period, light offshore wind. The energy kicks up to 599, and it’s actually surfable.
But the standout, the one you’re waiting for, is Sunday the 23rd of August. That same clean S swell pushes through with a long 12 second period, giving the waves some real power. The energy jumps to 948, and with light offshore wind from the SW, you’re looking at clean, peeling faces. That's the pick of the fortnight.
Now, a word of warning. Monday the 24th of August morning, the swell jumps to a massive 10 feet from the S with that long 12 second period. The energy is a beast at 2381. That’s expert-only territory. Steer clear if you’re not ready for it.
After that, we get a couple of glassy days. Tuesday the 25th of August is prime for experienced surfers: a 7 foot S swell with a very long 14 second period, completely glassy. The energy is a solid 1386. This kind of long period groundswell can be a bit tricky on a beach break, so look for a deeper channel or a sandbar.
Wednesday the 26th of August morning is also glassy with a 6 foot SSE swell and a 13 second period. More perfect conditions for the guys who know the break.
The end of the run fades into smaller, cleaner swells. By the 30th of August, you’ve got a clean 5 to 7 foot SSE swell with good winds, but the juice is gone.
So, set your alarms for Sunday the 23rd of August morning. That’s the one to clear your calendar for.
-Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Sun morning. Warm (max 30°C on Tue morning, min 18°C on Sun morning). Winds decreasing (fresh winds from the NNE on Mon afternoon, light winds from the WSW by Tue night). | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Thu afternoon, min 14°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NE 8 | NE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 7 | ENE 7 | ENE 7 | S 8 | SSW 7 | S 9 | S 10 | S 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 494 | 501 | 493 | 414 | 532 | 527 | 428 | 456 | 302 | 192 | 149 | 110 | 178 | 242 | 121 | 136 | 149 | 254 | 528 | 753 | 1019 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross | cross-off | cross | glassy | cross-off | cross-on | cross-off |
High Tide | 3:26PM0.54m | 3:30AM0.67m | 3:49PM0.55m | 4:12AM0.62m | 4:15PM0.54m | 4:57AM0.55m | 12:02PM0.42m | 5:50AM0.48m | 12:30PM0.49m | 00:33AM0.28m | 7:15AM0.41m | 12:52PM0.54m | 00:32AM0.31m | 1:10PM0.58m | 7:31PM0.38m | ||||||
Low Tide | 10:44AM0.13m | 7:53PM0.28m | 11:16AM0.24m | 8:20PM0.22m | 8:42AM0.31m | 8:52PM0.20m | 8:49AM0.34m | 1:09PM0.41m | 9:25PM0.21m | 8:57AM0.38m | 2:56PM0.45m | 9:57PM0.24m | 8:44AM0.40m | 5:09PM0.43m | 10:27PM0.29m | 4:11AM0.22m | 6:18PM0.38m | ||||
 |  |  |  | |  | | | | | | | |  | | | | | | |  | |
 | 6:45 | — | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — |
 | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 | — |
mm | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 |
Temp °C | 19 | 19 | 18 | 23 | 24 | 19 | 30 | 29 | 22 | 20 | 20 | 18 | 23 | 24 | 22 | 21 | 22 | 16 | 14 | 13 | 13 |
Feels °C | 18 | 17 | 16 | 21 | 22 | 18 | 29 | 31 | 23 | 20 | 20 | 20 | 20 | 23 | 21 | 18 | 19 | 16 | 13 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | SSE 10 | SSE 10 | SSE 10 | S 10 | SSE 10 | S 11 | S 10 | S 10 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 7 | S 9 | ENE 7 | ENE 7 | S 8 | S 7 | ENE 8 | S 10 | S 12 |
| kJ | 141 | 108 | 80 | 51 | 19 | 9 | 8 | 8 | 302 | 192 | 149 | 110 | 58 | 39 | 121 | 136 | 149 | 127 | 71 | 753 | 1019 |
Swell 2 Height (m) Direction Period (s) | E 13 | E 13 | E 13 | E 12 | SE 9 | SE 8 | — | — | S 9 | S 9 | S 8 | SE 5 | SE 6 | SE 6 | SSW 8 | S 8 | ENE 8 | ENE 8 | — | ENE 8 | ENE 8 |
| kJ | 14 | 14 | 13 | 3 | 3 | 3 | — | — | 6 | 2 | 1 | 17 | 11 | 9 | 22 | 11 | 128 | 142 | — | 54 | 54 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | E 14 | SE 12 | S 13 | S 7 | SE 12 | SE 12 | SSE 6 | SSE 6 | SE 6 | S 17 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 4 | 6 | 3 | 22 | 6 | 6 | 4 | 4 | 1 | 6 | — | — | — |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NE 8 | NE 8 | NE 8 | SSW 3 | SSW 3 | S 3 | — | ENE 8 | NE 7 | N 4 | SSW 4 | — | SSW 7 | S 9 | — | — |
| kJ | 494 | 501 | 493 | 414 | 532 | 527 | 428 | 456 | 4 | 2 | 1 | — | 178 | 242 | 10 | 8 | — | 254 | 528 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 2 | 105 | 25 | 115 | 29 | 105 | 2 | 0 | 0 | 11 | 2 | 2 | 2 | 2 | 0 | 24 | 0 | 0 | 2 | 0 |
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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