Surf Forecasts:
Siriu surf forecast from 17 Sep 2026:
- Best quality surf: Sunday 20 Sep, 9AM (local time) - 10ft (3.0m), 9s period, NE swell with cross-shore winds.
- Most powerful swell: Sunday 20 Sep, 9AM (local time) - 10ft (3.0m), 9s period, NE swell with 1,580 kJ wave energy.
- Next surfable swell (1★+): Friday 18 Sep, 12AM (local time) - 4ft (1.2m), 10s period with SSE swell.
Best Forecast Surf Conditions for Siriu this week:
The surf forecast for Siriu over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 18) at 12AM. The primary swell is predicted to be 1.2m and 10s period with a secondary swell of 0.3m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Siriu in the next 16 days are 3.0m 9s and forecast to arrive on Sunday (Sep 20) at 9AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 18th Sep) | 4ft (1.2m) 10s |
| Best Surf | 9AM (Sun 20th Sep) | 10ft (3.0m) 9s |
| Most Powerful | 9AM (Sun 20th Sep) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Siriu over the next 16 days.
Short Range ForecastHeavy rain (total 57mm), heaviest during Sat night. Warm (max 20°C on Fri morning, min 14°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 30mm), heaviest during Tue morning. Warm (max 25°C on Sun afternoon, min 15°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | |||||||||||||||
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) | S 9 | S 11 | SSE 10 | SSE 10 | SSE 9 | SSE 9 | ENE 7 | ENE 7 | ENE 8 | NE 9 | NE 9 | ENE 9 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | E 8 | ENE 8 | S 11 | S 13 | S 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 146 | 291 | 274 | 205 | 156 | 113 | 192 | 222 | 501 | 1580 | 1467 | 672 | 556 | 487 | 352 | 197 | 144 | 92 | 377 | 582 | 253 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-off | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-off | cross-on | cross-on | cross-off | glassy | cross-off | cross-off | glassy | cross-on | cross |
High Tide | 3:51PM0.57m | 5:37AM0.51m | 12:07PM0.54m | 11:52PM0.30m | 12:05PM0.59m | 11:20PM0.37m | 12:15PM0.64m | 11:19PM0.46m | 12:28PM0.69m | 11:34PM0.55m | 12:45PM0.73m | 11:56PM0.63m | 1:04PM0.77m | 00:20AM0.70m | |||||||
Low Tide | 9:29PM0.22m | 8:21AM0.46m | 2:52PM0.52m | 9:45PM0.29m | 9:41PM0.37m | 3:45AM0.24m | 5:46PM0.40m | 4:51AM0.17m | 5:58PM0.35m | 5:37AM0.09m | 6:22PM0.30m | 6:16AM0.03m | 6:49PM0.25m | ||||||||
 | |  |  | |  |  | |  |  | |  | |  | | |  | | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — | 6:05 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:08 | — | — | 6:08 | — | — | 6:09 | — | — | 6:09 | — |
mm | — | — | — | — | — | 7 | 16 | 12 | 22 | 1 | — | — | 1 | 4 | 10 | 14 | — | — | — | — | — |
Temp °C | 18 | 19 | 15 | 20 | 20 | 18 | 18 | 18 | 19 | 24 | 25 | 21 | 23 | 20 | 20 | 20 | 17 | 16 | 18 | 19 | 17 |
Feels °C | 15 | 15 | 12 | 17 | 17 | 16 | 16 | 16 | 17 | 23 | 24 | 23 | 24 | 22 | 22 | 23 | 15 | 14 | 17 | 17 | 14 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 11 | SSE 10 | SSE 10 | SSE 9 | ENE 6 | SSE 9 | SSE 9 | SSE 12 | ENE 9 | ENE 9 | ENE 9 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | E 8 | ENE 8 | S 11 | S 13 | S 11 |
| kJ | 146 | 291 | 274 | 205 | 156 | 49 | 62 | 26 | 49 | 926 | 800 | 672 | 556 | 487 | 352 | 197 | 144 | 92 | 377 | 582 | 253 |
Swell 2 Height (m) Direction Period (s) | SSE 11 | E 7 | E 7 | E 10 | E 9 | SSE 9 | SSE 13 | SSE 13 | E 12 | SSE 12 | SSE 12 | S 11 | S 10 | S 9 | S 9 | S 11 | S 11 | SSE 5 | ENE 8 | E 8 | ENE 8 |
| kJ | 97 | 17 | 9 | 31 | 28 | 113 | 17 | 32 | 3 | 14 | 14 | 20 | 17 | 15 | 13 | 10 | 9 | 26 | 90 | 86 | 90 |
Swell 3 Height (m) Direction Period (s) | E 7 | ESE 11 | ESE 11 | ENE 4 | — | ESE 8 | ESE 10 | SSE 8 | — | — | — | — | — | S 6 | S 12 | — | E 13 | S 10 | SE 5 | ESE 13 | E 12 |
| kJ | 17 | 12 | 11 | 3 | — | 24 | 20 | 14 | — | — | — | — | — | 3 | 11 | — | 4 | 7 | 13 | 33 | 24 |
Wind waves Height (m) Direction Period (s) | — | NE 2 | — | NE 4 | NE 4 | NE 6 | ENE 7 | ENE 7 | ENE 8 | NE 9 | NE 9 | — | — | — | — | — | — | S 5 | — | — | — |
| kJ | — | 1 | — | 7 | 9 | 95 | 192 | 222 | 501 | 1580 | 1467 | — | — | — | — | — | — | 46 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 9 | 27 | 0 | 9 | 26 | 9 | 16 | 16 | 368 | 113 | 39 | 0 | 9 | 16 | 0 | 0 | 0 | 0 | 0 | 27 | 9 |
Best forecast wave conditions in Santa Catarina - Sul | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Siriu surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Siriu Surf forecast
The above surf forecast table for Siriu provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Siriu can be found by selecting the local surf guide option on the grey menu. Our Siriu 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 (Siriu) 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 Siriu 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.
Siriu is 27 km (17 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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