Surf Forecasts:
Rosa surf forecast from 15 Aug 2026:
- Best quality surf: Saturday 22 Aug, 3AM (local time) - 6.5ft (2.0m), 8s period, S swell with cross-offshore winds.
- Most powerful swell: Saturday 22 Aug, 9PM (local time) - 7.5ft (2.3m), 12s period, S swell with 1,547 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 3PM (local time) - 6ft (1.9m), 8s period with NE 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 3PM. The primary swell is predicted to be 1.9m and 8s period with a secondary swell of 0.2m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Rosa in the next 16 days are 2.3m 12s and forecast to arrive on Saturday (Aug 22) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Thursday (Aug 20) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Tue 18th Aug) | 6ft (1.9m) 8s |
| Best Surf | 3AM (Sat 22nd Aug) | 6.5ft (2.0m) 8s |
| Most Powerful | 9PM (Sat 22nd Aug) | 7.5ft (2.3m) 12s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
G’day, I’m Rusty. Let’s look at what Rosa’s got cookin’ over the next couple of weeks.
Right off the bat, we’ve got a bit of a flat start. The first surf worth paddling out for doesn’t show until Wednesday, the 19th of August. Before that, from Saturday the 15th right through Tuesday the 18th, it’s a write-off—cross-onshore junk, messy and choppy, with scores that wouldn’t get a grommet out of bed. Forget it.
Wednesday the 19th morning offers a little breather. At Rosa, a clean 4 ft SSE swell creeps in from the east-northeast, with light cross-offshore breezes keeping things tidy. Wave energy is weak though (251), and the period’s short at 8 seconds, so it’s not gonna light up the point. Still, it’s surfable and clean—a good chance to stretch the arms after a dry spell. Water temp sits at 66°, about average for this time of year.
Thursday the 20th and Friday the 21st? Don’t bother. Cross-on winds and tiny, weak swell make for poor conditions, though Friday morning has a tiny pulse of 3 ft with offshore wind and clean lines—just not enough push to get excited about.
Now, listen up. The real standout hits Saturday the 22nd of August. Saturday morning at Rosa sees a clean 5 ft S swell, light cross-offshore wind, and the power is building (506). That’s the one to be on. It only gets better Sunday the 23rd morning: a solid 8 ft S groundswell with a 12-second period, clean and cross-offshore. That’s excellent surf for experienced surfers—powerful, punchy, and organized. Combined energy is strong at 1792, and it’s a proper south swell hitting the exposed break. If you’re intermediate or above, you won’t want to miss that session.
Monday the 24th of August morning is the true gem of the whole outlook. An 8 ft S groundswell (enough to be expert-only territory) with a long 14-second period, pure offshore wind from the WSW, glassy clean lines, and a massive energy reading of 2780. This is a proper groundswell—long period, powerful, and best handled at a reef or point, so keep that in mind. The wave quality is top-tier. If you’re experienced, this is your day.
After that, the swell drops but stays clean into Tuesday the 25th morning with a 5 ft S swell and light wind, still good for a fun session. Then we hit a rough patch: Wednesday the 26th through Friday the 28th morning see messy onshore winds and lumpy surf, though Friday the 28th morning does offer a clean 5 ft ESE swell with cross-offshore wind and clean conditions—a decent little surprise.
Saturday the 29th morning is glassy, with a 6 ft ENE swell and light easterly breeze—smooth as a mirror. Not huge, but clean as a whistle. Sunday the 30th, unfortunately, the onshores return and it gets choppy again.
Best on offer: Sunday the 23rd morning for a powerful, clean groundswell, and Monday the 24th morning for the absolute standout—big, long-period south swell with offshore wind. That’s the one you circle on the calendar. A bit less certain that far out, but looking real promising.
Stay salty,
Rusty
Short Range ForecastLight rain (total 6mm), mostly falling on Sat afternoon. Warm (max 30°C on Tue morning, min 17°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 25°C on Tue afternoon, min 18°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sat 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
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) | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NE 8 | NE 9 | NE 8 | NE 8 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | ENE 8 | ENE 7 | SSW 8 | SSW 8 |
Wave Graph | ||||||||||||||||||||
553 | 709 | 645 | 493 | 531 | 617 | 702 | 628 | 711 | 479 | 324 | 197 | 165 | 119 | 122 | 284 | 150 | 99 | 392 | 629 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross | cross | glassy | cross | cross-off | cross | glassy | cross-on | cross-on | glassy | cross-off | cross | cross-off |
High Tide | 3:07PM0.54m | 2:51AM0.70m | 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 | |||||
Low Tide | 10:06PM0.32m | 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 | ||||
— | — | 6:45 | — | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | |
5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | |
mm | 5 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — |
Temp °C | 18 | 18 | 21 | 21 | 19 | 24 | 24 | 19 | 30 | 25 | 21 | 23 | 22 | 19 | 23 | 23 | 20 | 22 | 20 | 15 |
Feels °C | 18 | 17 | 19 | 18 | 17 | 22 | 22 | 19 | 29 | 27 | 23 | 23 | 21 | 21 | 22 | 21 | 20 | 20 | 16 | 12 |
Swell 1 Height (m) Direction Period (s) | S 11 | E 8 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | S 11 | ENE 8 | S 10 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SE 6 | ENE 8 | ENE 7 | S 8 | S 8 |
351 | 565 | 141 | 108 | 80 | 33 | 19 | 9 | 493 | 7 | 324 | 197 | 165 | 119 | 122 | 21 | 150 | 99 | 223 | 432 | |
Swell 2 Height (m) Direction Period (s) | — | S 11 | S 10 | E 13 | — | — | SE 9 | — | S 10 | — | S 9 | S 9 | SSW 8 | S 8 | SSE 7 | S 8 | S 8 | S 8 | ENE 7 | ENE 8 |
— | 233 | 221 | 13 | — | — | 3 | — | 8 | — | 6 | 6 | 11 | 110 | 79 | 33 | 22 | 20 | 94 | 103 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | E 13 | S 8 | SE 13 | SE 13 | S 9 | SE 12 | SE 6 | SSE 6 | S 16 | S 15 |
— | — | — | — | — | — | — | — | — | — | 4 | 1 | 7 | 7 | 14 | 6 | 6 | 4 | 5 | 18 | |
Wind waves Height (m) Direction Period (s) | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NE 8 | NE 9 | NE 8 | NE 8 | SW 2 | SSW 4 | SSW 4 | — | NE 3 | NE 8 | N 4 | SSW 4 | SSW 8 | SSW 8 |
553 | 709 | 645 | 493 | 531 | 617 | 702 | 628 | 711 | 479 | 1 | 7 | 5 | — | 4 | 284 | 24 | 5 | 392 | 629 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 2 | 2 | 12 | 41 | 215 | 63 | 115 | 29 | 116 | 0 | 2 | 0 | 24 | 0 | 2 | 284 | 0 | 0 | 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.











