Surf Forecasts:
Rosa surf forecast from 18 Aug 2026:
- Best quality surf: Saturday 22 Aug, 3AM (local time) - 8ft (2.4m), 9s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 9AM (local time) - 8ft (2.5m), 14s period, S swell with 2,662 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 6PM (local time) - 5ft (1.6m), 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 1.6m 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 2.5m 14s 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 0.4m 3s period and expected on Tuesday (Aug 18) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Tue 18th Aug) | 5ft (1.6m) 8s |
| Best Surf | 3AM (Sat 22nd Aug) | 8ft (2.4m) 9s |
| Most Powerful | 9AM (Mon 24th Aug) | 8ft (2.5m) 14s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
Alright, grab your board and let’s get into it.
The next couple of weeks are a real mixed bag, so you gotta pick your moments. There's a slow start, then a proper pulse of groundswell around the weekend that looks like the clear standout. After that, it fades out to small, choppy stuff. Don't sleep on the long-range potential, but treat it as a “maybe” at this point.
The first few days are pretty flat and messy. Tuesday and Wednesday are small and weak, with the swell energy sitting around 169-922 (moderate but uninspiring), and the winds are all over the place. Don't get too excited about the 7ft on Tuesday morning because the period is only 8 seconds, so it’s gonna be lumpy and the cross-shore wind will chop it up. Not worth the paddle.
We’ve got a couple of days with basically nothing on offer. The swell drops off, but the winds stay onshore or cross, so Thursday is a washout. Friday offers a brief reprieve with cleaner conditions, but the swell is tiny, only 3ft. It’s really just a chance to get wet and not much else.
Now here’s where it gets interesting. The real surf shows up on Saturday the 22nd. A new S swell starts to push in, and by the morning, we’re looking at 6ft with a 9-second period. The wind is light and cross-off, and the conditions should be clean. The energy is building, sitting at 640 (moderate). This is just the warm-up though.
Sunday the 23rd is when it starts to get serious. The swell holds at 7ft but the period jumps to 11 seconds, and the energy is up to 1095 (strong). The wind is light and cross-off in the morning, so it’s going to be proper. This is the start of the good stuff.
But the real standout is Monday the 24th. This is the day. The swell pushes up to 8ft with a very long 14-second period, and the combined energy is at 2668, which is seriously strong. The morning is glassy, absolutely glassy, with the wind barely a whisper out of the SSW. This is the kind of day you call in sick for. The swell direction is S, which isn't exactly the SSE optimum, but at this size and period, the power will be there.
This is a long-period groundswell, so take note. It’s going to be breaking a bit too straight at the beach breaks, so this one is for the point breaks and reefs. You’ll get long waits between sets, but the waves that come through will have real push. This is definitely not for beginners, over 8ft, it’s expert territory.
The afternoon on Monday gets a bit tricky with an onshore wind, but the morning is the window.
After that, the swell slowly fades through the week. Tuesday the 25th still has some size, but the northeasterly wind starts to mess things up. By the middle of the week, it’s back to the small stuff and we’re looking at poor conditions.
Looking further out, there’s something on the radar for the end of August. The 28th shows a clean SSE swell, but it's small, around 3ft. The following weekend, the 30th and 31st, we’ve got a promising pattern with an ENE swell and clean, cross-off winds. The energy is moderate, around 504-617, and it looks like it could be a fun, clean, smaller day. Keep an eye on the 31st as it might have a little more size. But it's a week and a half out, so don't book your flights yet.
The first of September looks like another poor run of onshore, choppy conditions. Not what we want to see.
So, to sum it up: the surf is pretty average to start, but the window from Saturday the 22nd through Monday the 24th is your best bet, with Monday morning being the one to chase. After that, it’s a waiting game.
Later, Rusty.
Short Range ForecastMostly dry. Warm (max 33°C on Tue afternoon, min 18°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Fri morning. Warm (max 22°C on Fri morning, min 10°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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) | NE 8 | NE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NNE 5 | ENE 7 | S 7 | SSW 9 | S 9 | S 8 | S 9 | S 11 | S 11 | S 11 |
Wave Graph | |||||||||||||||||||
467 | 517 | 493 | 255 | 161 | 116 | 99 | 110 | 204 | 45 | 84 | 206 | 999 | 554 | 737 | 1210 | 1068 | 969 | 1087 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | glassy | cross-off | cross | glassy | cross-on | cross-on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off |
High Tide | 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 | 1:24PM0.61m | 11:38PM0.43m | |||||
Low Tide | 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 | 5:19AM0.15m | 6:41PM0.33m | ||||
— | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | |
— | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 | — | — | 5:55 | — | |
mm | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — |
Temp °C | 21 | 32 | 33 | 22 | 21 | 20 | 18 | 23 | 24 | 20 | 22 | 20 | 15 | 14 | 13 | 12 | 13 | 13 | 11 |
Feels °C | 21 | 31 | 33 | 23 | 21 | 20 | 20 | 21 | 22 | 20 | 19 | 16 | 12 | 11 | 8 | 8 | 10 | 10 | 9 |
Swell 1 Height (m) Direction Period (s) | S 11 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 8 | NE 5 | ENE 7 | ENE 7 | S 8 | ENE 9 | ENE 9 | S 9 | S 11 | S 11 | S 11 |
9 | 394 | 365 | 255 | 161 | 116 | 99 | 110 | 68 | 25 | 84 | 94 | 579 | 86 | 71 | 840 | 1068 | 969 | 1087 | |
Swell 2 Height (m) Direction Period (s) | SE 8 | S 10 | S 10 | S 9 | S 9 | SSW 7 | S 7 | S 7 | SE 12 | ENE 7 | S 8 | — | ENE 8 | — | S 14 | ENE 9 | ENE 8 | NE 8 | ENE 8 |
3 | 8 | 8 | 6 | 2 | 5 | 47 | 43 | 6 | 42 | 29 | — | 111 | — | 15 | 30 | 27 | 17 | 6 | |
Swell 3 Height (m) Direction Period (s) | — | SE 8 | — | E 14 | SE 12 | S 9 | S 10 | S 9 | SE 12 | SSW 8 | SE 6 | — | — | — | — | — | — | — | — |
— | 3 | — | 4 | 6 | 1 | 19 | 40 | 6 | 22 | 1 | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | NE 8 | NE 8 | NE 8 | SSW 3 | SSW 3 | SSW 3 | — | — | NE 8 | NNE 5 | — | S 7 | SSW 9 | S 9 | S 8 | S 9 | — | — | — |
467 | 517 | 493 | 1 | 2 | 2 | — | — | 204 | 45 | — | 206 | 999 | 554 | 737 | 1210 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 29 | 2 | 2 | 0 | 0 | 11 | 0 | 12 | 2 | 0 | 0 | 2 | 2 | 0 | 802 | 2 | 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.











