Surf Forecasts:
Rosa surf forecast from 21 Aug 2026:
- Best quality surf: Friday 21 Aug, 9PM (local time) - 10ft (3.0m), 9s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 9AM (local time) - 10ft (3.0m), 16s period, S swell with 3,769 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 9PM (local time) - 10ft (3.0m), 9s 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 Friday (Aug 21) at 9PM. The primary swell is predicted to be 3.0m and 9s period with a secondary swell of 0.6m 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 3.0m 16s and forecast to arrive on Monday (Aug 24) at 9AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Friday (Aug 28) at 6AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 21st Aug) | 10ft (3.0m) 9s |
| Best Surf | 9PM (Fri 21st Aug) | 10ft (3.0m) 9s |
| Most Powerful | 9AM (Mon 24th Aug) | 10ft (3.0m) 16s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
Alright, Rusty here. Let's get into it.
The first few days are a bit of a mixed bag, but the real standout is gonna be a big one on Monday the 24th. We’ve got some solid southerly energy building, but the wind and clean conditions are what will make the magic happen.
Friday, August 21st kicks off with a clean, cross-off 4ft SSW swell at Rosa, but the energy is weak (242) and the period is short. It's a bit of a tease. The afternoon gets worse, with a gusty cross-shore wind and a choppy 6ft S swell. Not worth paddling out for.
Saturday, August 22nd is similar. The morning has a clean 8ft S swell (963 energy), but the wind is cross-off, making it look better than it probably is. The afternoon is a write-off with a cross-shore mess.
Sunday, August 23rd is where it starts to get interesting. The morning is clean with a light cross-off breeze and a 6ft S swell. The period jumps to 12 seconds, which is a proper groundswell, and the energy is solid (1021). This is a good one for experienced surfers. The waves will have more shape and power, but that long period might make it a bit straight at a beach break. Still, it’s the best of the run so far.
Monday, August 24th – this is the big one. The morning is glassy, absolutely glassy, with a 10ft S swell. The period is a massive 16 seconds, and the combined energy is pumping (3774). This is a very long period groundswell, and for a spot like Rosa, the water temp is about 66°F, which is pretty normal for this time of year. This swell is going to be a freight train. It’s too big for beginners and will only be for the experts. The best banks will handle it, but it might be a bit too much for the beachbreak. If you’re not an expert, sit this one out and watch.
Tuesday, August 25th through the end of the month gets messy. The swell drops, the wind turns onshore, and we get a lot of rain and choppy conditions. There are a few clean windows, like the morning of Sunday, August 30th, with a 5ft ENE swell and light cross-off wind, but the energy is pretty low (370) and the period is short. It’s a small, clean option, but nothing special.
Tuesday, September 1st has a glassy morning with a tiny 4ft NE swell. It’s small, but clean. The real return to form looks like Wednesday, September 2nd. The morning is clean with a light cross-off wind and a solid 7ft S swell (647 energy). The period is short at 8 seconds, but the conditions look excellent for a fun session.
Beyond that, it’s mostly onshore or rainy, with a couple of marginal looks. The best bet is hands down the Monday the 24th morning for the brave, or Sunday the 23rd morning for a slightly more manageable but still powerful session.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Fri morning, min 9°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Wed afternoon. Very mild (max 19°C on Wed afternoon, min 11°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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) | SSW 7 | S 9 | S 9 | S 9 | S 10 | S 10 | S 12 | S 12 | S 14 | S 16 | S 14 | S 13 | S 13 | S 12 | S 12 | SSE 15 | SSE 13 | SSE 13 | SSE 14 | SSE 14 | SSE 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 186 | 549 | 1198 | 923 | 782 | 661 | 988 | 1392 | 3128 | 3769 | 2814 | 1710 | 1173 | 841 | 615 | 568 | 1028 | 837 | 779 | 700 | 346 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross-off | cross | glassy | cross-off | cross | cross-off | glassy | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross-on | cross | cross-on | cross |
High Tide | 12:52PM0.54m | 00:32AM0.31m | 1:10PM0.58m | 7:31PM0.38m | 1:24PM0.61m | 11:38PM0.43m | 1:34PM0.64m | 00:01AM0.50m | 1:43PM0.66m | 00:28AM0.58m | 1:55PM0.67m | 00:57AM0.64m | 2:11PM0.67m | 1:26AM0.68m | |||||||
Low Tide | 5:09PM0.43m | 10:27PM0.29m | 4:11AM0.22m | 6:18PM0.38m | 5:19AM0.15m | 6:41PM0.33m | 6:09AM0.09m | 7:08PM0.30m | 6:51AM0.03m | 7:34PM0.27m | 7:27AM-0.02m | 8:01PM0.25m | 8:02AM-0.05m | 8:27PM0.24m | |||||||
 | |  |  | |  | | | | | | |  | | | |  |  | | | | |
 | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — |
 | — | 5:54 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:57 | — | — | 5:58 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | — | — | — |
Temp °C | 20 | 18 | 14 | 14 | 13 | 10 | 14 | 14 | 12 | 13 | 13 | 12 | 17 | 17 | 14 | 18 | 19 | 18 | 24 | 24 | 19 |
Feels °C | 17 | 13 | 10 | 10 | 9 | 8 | 11 | 10 | 8 | 11 | 10 | 10 | 15 | 14 | 12 | 17 | 18 | 17 | 21 | 21 | 17 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 9 | S 10 | S 12 | S 12 | S 14 | S 16 | S 14 | S 13 | S 13 | S 12 | S 12 | S 11 | SSE 13 | SSE 13 | SSE 14 | SSE 14 | SSE 13 |
| kJ | 54 | 59 | 35 | 40 | 43 | 661 | 988 | 1392 | 3128 | 3769 | 2814 | 1710 | 1173 | 841 | 615 | 410 | 1028 | 837 | 779 | 700 | 346 |
Swell 2 Height (m) Direction Period (s) | E 11 | E 11 | — | — | — | ENE 8 | NE 8 | NE 8 | ENE 7 | ENE 7 | — | — | — | — | SE 16 | SSE 15 | — | — | — | — | — |
| kJ | 2 | 2 | — | — | — | 28 | 16 | 15 | 5 | 5 | — | — | — | — | 127 | 568 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | NE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 17 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 7 | S 9 | S 9 | S 9 | S 10 | — | — | — | — | — | — | — | — | NE 4 | NE 4 | NE 4 | NE 5 | ENE 6 | ENE 7 | NE 7 | NE 7 |
| kJ | 186 | 549 | 1198 | 923 | 782 | — | — | — | — | — | — | — | — | 13 | 16 | 15 | 47 | 209 | 218 | 287 | 293 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 86 | 2 | 2 | 24 | 0 | 0 | 2 | 2 | 2 | 24 | 4 | 4 | 12 | 2 | 4 | 12 | 2 | 12 | 115 | 41 |
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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