Surf Forecasts:
Rosa surf forecast from 16 Sep 2026:
- Best quality surf: Monday 21 Sep, 12AM (local time) - 7.5ft (2.3m), 9s period, NE swell with glassy winds.
- Most powerful swell: Sunday 20 Sep, 9PM (local time) - 8ft (2.4m), 8s period, NE swell with 819 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 3AM (local time) - 5ft (1.5m), 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 Wednesday (Sep 16) at 3AM. The primary swell is predicted to be 1.5m and 8s period with a secondary swell of 0.8m and 11s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Rosa in the next 16 days are 2.4m 8s and forecast to arrive on Sunday (Sep 20) 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 0.6m 3s period and expected on Wednesday (Sep 23) at 3AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Wed 16th Sep) | 5ft (1.5m) 8s |
| Best Surf | 12AM (Mon 21st Sep) | 7.5ft (2.3m) 9s |
| Most Powerful | 9PM (Sun 20th Sep) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
G’day. Looking down the whole run for Rosa, it’s a slow start with a couple of gems hidden in the back half. The first week is mostly a grind with only a few clean windows, but late September and the first of October have proper moments.
Wednesday morning, 16 September – clean and glassy, `1.2m` from the south at 8 seconds. Energy is weak (349). It’s surfable but nothing special. Slightly under the ideal SE direction, but for a cheeky paddle, it’ll do.
Then it turns pretty ragged. Saturday 19th blows out with cross-onshore winds and `1.9m` of short-period ENE junk – messy, choppy, not worth it. Sunday 20th has more size at `2.2m` but it’s still cross-shore and rain-soaked. Marginal.
Monday morning, 21 September – glassy again, `1.7m` at 8 seconds. Clean but short-period, so it won’t have much grunt. Tuesday and Wednesday drop right off to around `0.9m` to `1.3m`, with clean cross-off winds on Wednesday morning, but it’s gutless.
Here’s the first real standout: Tuesday afternoon, 29 September – glassy, with `1.2m` from the south at 12 seconds. Combined energy is strong (563). That long-period groundswell will wrap in nicely, and the glassy conditions make it a dream. This is the pick of the whole window, no doubt.
Wednesday 30 September – blows out with big `3.0m` at 8 seconds and cross-onshore winds. Too big and too messy for anyone but experts, and even then, it’s chaotic.
The last good one: Thursday morning, 01 October – `2.5m` from the south at 10 seconds, very strong energy (1340). Light cross-off wind, clean conditions, and it’s rated excellent for experienced surfers. That’s a proper session for the crew who can handle it. Note this is over 2.5m, so definitely not for learners.
So, the takeaway: don’t waste your time before the 29th unless you’re desperate. That Tuesday arvo is your best bet – clean, chest-high, long period, and likely uncrowded. The 1st is bigger and heavier, more of a big-wave day for the experienced. The rest is either too small, too onshore, or just plain messy. Rosa isn’t firing consistently, but when it lines up, it’s worth the wait.
Rusty, out.
Short Range ForecastSome drizzle, heaviest during Fri afternoon. Very mild (max 19°C on Thu morning, min 13°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 38mm), heaviest during Sat morning. Warm (max 25°C on Sun morning, min 17°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | ||||||||||||||
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 7 | S 8 | S 9 | S 10 | S 8 | S 11 | S 10 | S 10 | SSE 9 | S 9 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | NE 8 | NE 9 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 183 | 182 | 258 | 546 | 167 | 389 | 290 | 231 | 147 | 108 | 186 | 323 | 468 | 635 | 632 | 745 | 385 | 330 | 250 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross | glassy | cross | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | glassy | glassy | cross-on | glassy |
High Tide | 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 | 12:49PM0.62m | 11:33PM0.46m | |||||
Low Tide | 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 | 4:51AM0.14m | 6:01PM0.32m | ||||
 |  | |  | | | |  |  |  |  |  |  |  | | | |  |  | |
 | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — | 6:05 | — | — |
 | 6:07 | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:08 | — | — | 6:09 | — |
mm | — | — | — | — | — | — | — | — | 1 | 8 | 13 | 6 | 7 | 1 | — | — | — | 3 | 2 |
Temp °C | 15 | 18 | 17 | 15 | 19 | 18 | 16 | 18 | 18 | 17 | 18 | 19 | 19 | 25 | 24 | 21 | 25 | 24 | 21 |
Feels °C | 12 | 15 | 13 | 14 | 16 | 14 | 15 | 17 | 17 | 16 | 17 | 18 | 18 | 25 | 24 | 23 | 27 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | S 7 | S 8 | S 9 | S 10 | S 8 | S 11 | S 10 | S 10 | SSE 9 | S 9 | S 9 | SSE 9 | S 13 | S 12 | S 12 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 183 | 182 | 258 | 546 | 167 | 389 | 290 | 231 | 147 | 108 | 57 | 15 | 51 | 25 | 25 | 524 | 385 | 330 | 250 |
Swell 2 Height (m) Direction Period (s) | S 12 | S 10 | E 7 | E 7 | S 11 | E 7 | E 7 | E 10 | E 10 | ESE 8 | S 13 | S 13 | SSE 8 | S 8 | — | S 11 | S 10 | S 9 | S 9 |
| kJ | 174 | 128 | 27 | 27 | 116 | 17 | 9 | 31 | 29 | 24 | 29 | 29 | 6 | 1 | — | 9 | 8 | 7 | 6 |
Swell 3 Height (m) Direction Period (s) | SE 8 | E 7 | SSE 14 | E 12 | E 8 | ESE 11 | E 11 | — | — | S 14 | — | S 9 | — | — | — | E 14 | — | — | S 12 |
| kJ | 51 | 39 | 67 | 11 | 18 | 12 | 9 | — | — | 4 | — | 6 | — | — | — | 4 | — | — | 3 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | NE 3 | NE 4 | ENE 4 | NE 5 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | NE 8 | NE 9 | — | — | — |
| kJ | — | — | — | — | — | 4 | 12 | 12 | 57 | 107 | 186 | 323 | 468 | 635 | 632 | 745 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 24 | 0 | 4 | 12 | 4 | 4 | 12 | 2 | 2 | 2 | 2 | 23 | 2 | 0 | 0 | 2 | 0 |
Best forecast wave conditions in Santa Catarina - Sul | |||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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