Surf Forecasts:
Rosa surf forecast from 12 Sep 2026:
- Best quality surf: Thursday 17 Sep, 12AM (local time) - 7ft (2.1m), 11s period, S swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 12AM (local time) - 7ft (2.1m), 11s period, S swell with 1,018 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 9PM (local time) - 3ft (0.9m), 7s period with SE 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 Sunday (Sep 13) at 9PM. The primary swell is predicted to be 0.9m and 7s period with a secondary swell of 0.7m and 7s. 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 2.1m 11s and forecast to arrive on Thursday (Sep 17) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Tuesday (Sep 15) at 6PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sun 13th Sep) | 3ft (0.9m) 7s |
| Best Surf | 12AM (Thu 17th Sep) | 7ft (2.1m) 11s |
| Most Powerful | 12AM (Thu 17th Sep) | 7ft (2.1m) 11s |
Table - best surf conditions forecast for Rosa over the next 16 days.
The Lowdown
Hey, Rusty here. We’ve got a mixed bag coming up at Rosa in the next 16 days—some clean, fun waves, a proper standout session, and a massive pulse that’s only for the hardcore crew.
Water temp is 62°—that’s about 4° colder than normal for this time of year, so it feels much colder than usual at Rosa.
The run starts poor. Saturday the 12th: 3ft ENE swell, 8-second period, weak energy (125). Cross-off wind but messy. Sunday the 13th has 3ft SSW swell, still marginal. Monday the 14th is the first real chance: 4ft S swell with an 11-second period (good groundswell), moderate energy (406). Light cross-off winds, clean. Worth a paddle.
Tuesday the 15th morning offers 5ft ENE swell, 8-second period, energy up to 448. Light winds, clean. Afternoon gets choppy.
Best session of the period: Thursday the 17th morning. Glassy with a 5 mph NNE breeze, 6ft S swell, 10-second period, strong energy at 633. Clean, punchy, quality waves. This is the one.
Friday the 18th and Saturday the 19th drop off—smaller, messy. Sunday the 20th is glassy but only 3ft E swell, 7-second period, low energy (182). Monday the 21st early is glassy with 4ft E swell, but short period. Surfable, not special.
Big swell alert. Wednesday the 23rd: 10ft S swell, 10-second period, energy of 1638. Clean winds, but too big for all but experts. Thursday the 24th: 13ft SSE swell, 17-second period (very long groundswell), energy at 9737. That’s huge and dangerous—expert-only or tow-in. Friday the 25th still sees 8ft SSE swell, 15-second period, energy 3287—still only for the brave.
From the 26th, it drops to manageable sizes—5ft SSE on Saturday the 26th, 5ft ENE on Sunday the 27th—but conditions are just average.
Final call: for clean, surfable waves, Thursday the 17th morning is your golden window. For size and a big adrenaline rush, the 23rd–25th are massive but only for experts.
Rusty.
Short Range ForecastHeavy rain (total 23mm), heaviest during Sun night. Very mild (max 17°C on Sat morning, min 13°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Tue afternoon. Very mild (max 18°C on Tue morning, min 13°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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 | S 7 | SSW 6 | SSW 7 | S 7 | SE 7 | S 11 | S 10 | ENE 8 | ENE 8 | E 8 | S 12 | S 7 | S 8 | S 11 | S 10 | S 10 | S 10 | S 10 | SSE 10 | SSE 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 83 | 295 | 108 | 108 | 100 | 91 | 277 | 214 | 226 | 264 | 418 | 228 | 172 | 298 | 1018 | 592 | 443 | 424 | 196 | 154 | 238 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off | glassy | cross-on | cross | cross | cross-on | cross-off |
High Tide | 2:08PM0.57m | 2:01AM0.72m | 2:24PM0.58m | 2:37AM0.71m | 2:45PM0.58m | 3:14AM0.67m | 3:09PM0.58m | 3:54AM0.62m | 3:34PM0.56m | 4:36AM0.55m | 4:00PM0.53m | 5:28AM0.47m | 12:05PM0.52m | 00:14AM0.27m | |||||||
Low Tide | 9:03AM0.03m | 8:57PM0.23m | 9:35AM0.12m | 9:05PM0.20m | 10:03AM0.22m | 8:01PM0.17m | 8:18AM0.31m | 8:10PM0.14m | 8:04AM0.34m | 8:33PM0.14m | 8:14AM0.37m | 12:59PM0.47m | 8:59PM0.17m | 8:22AM0.39m | 2:57PM0.47m | 9:25PM0.22m | |||||
 | |  |  | |  | | |  |  | |  |  | | | | | | | | | |
 | 6:16 | — | — | 6:15 | — | — | 6:13 | — | — | 6:11 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — |
 | — | 6:05 | — | — | 6:06 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — |
mm | — | — | — | 1 | 4 | 8 | 4 | 3 | 3 | — | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 16 | 16 | 15 | 15 | 13 | 13 | 14 | 14 | 18 | 17 | 15 | 17 | 17 | 14 | 17 | 18 | 15 | 20 | 22 | 17 |
Feels °C | 16 | 13 | 13 | 13 | 13 | 11 | 12 | 14 | 13 | 17 | 14 | 13 | 12 | 12 | 11 | 14 | 14 | 12 | 17 | 19 | 16 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | ENE 8 | SSE 7 | SE 7 | SE 7 | SE 7 | S 11 | ESE 7 | ENE 8 | ENE 8 | E 8 | E 8 | E 8 | E 8 | S 11 | S 10 | S 10 | S 10 | S 10 | SSE 10 | NE 6 |
| kJ | 83 | 65 | 93 | 47 | 60 | 91 | 277 | 131 | 226 | 264 | 418 | 195 | 108 | 86 | 1018 | 592 | 443 | 424 | 196 | 154 | 94 |
Swell 2 Height (m) Direction Period (s) | S 10 | S 10 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SE 8 | S 10 | S 8 | SE 8 | S 10 | S 12 | S 10 | SE 8 | E 8 | E 8 | E 8 | E 10 | SE 13 | SE 12 | SSE 11 |
| kJ | 31 | 2 | 68 | 49 | 50 | 50 | 82 | 214 | 140 | 94 | 135 | 228 | 135 | 9 | 44 | 31 | 32 | 49 | 134 | 124 | 238 |
Swell 3 Height (m) Direction Period (s) | E 12 | E 12 | S 11 | E 11 | SSE 14 | S 7 | ENE 8 | ENE 7 | SE 8 | S 8 | SE 9 | SE 8 | SE 8 | SSE 14 | ESE 8 | E 11 | ESE 11 | E 10 | ESE 9 | ESE 9 | ESE 8 |
| kJ | 11 | 3 | 10 | 3 | 38 | 34 | 47 | 29 | 99 | 90 | 27 | 32 | 20 | 19 | 6 | 10 | 12 | 51 | 29 | 28 | 24 |
Wind waves Height (m) Direction Period (s) | SSW 6 | S 7 | SSW 6 | SSW 7 | S 7 | — | — | — | — | — | S 10 | S 6 | S 7 | S 8 | — | — | NE 3 | NE 4 | NE 5 | NE 6 | NE 6 |
| kJ | 108 | 295 | 108 | 108 | 100 | — | — | — | — | — | 257 | 132 | 172 | 298 | — | — | 3 | 39 | 65 | 96 | 130 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 11 | 2 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 24 | 2 | 2 | 24 | 0 | 0 | 12 | 23 | 23 | 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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