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Siriu Surf Forecast
/ Santa Catarina – Sul (37 surf breaks) /
Surf Forecasts:
Siriu surfForecast / Santa Catarina – Sul / Brazil
12 Day Weather and Surf, issued 2 pm Sunday 07 Dec 2025 -03Forecast update in hr min s Forecast update imminent
Siriu surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Siriu sea temperature is
22.0° C
(Which is 1.4°C colder than average for this time of year)Best Forecast Surf Conditions for Siriu this week:
The surf forecast for Siriu over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Dec 10) at 12AM. The primary swell is predicted to be 3.0m and 8s period with a secondary swell of 2.0m and 8s. Another secondary swell of 0.2m and 10s is also forecast. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Siriu in the next 12 days are 2.4m 12s and forecast to arrive on Thursday (Dec 11) at 12PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Wednesday (Dec 10) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 10th Dec) | 10ft (3.0m) 8s |
| Best Surf | 12AM (Wed 10th Dec) | 10ft (3.0m) 8s |
| Most Powerful | 12PM (Thu 11th Dec) | 8ft (2.4m) 12s |
Table - best surf conditions forecast for Siriu over the next 12 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Heavy rain (total 61mm), heaviest during Tue morning. Warm (max 27°C on Sun afternoon, min 21°C on Sun night). Mainly fresh winds. | Days 3-6 Weather Summary Moderate rain (total 19mm), heaviest on Fri night. Warm (max 28°C on Fri morning, min 19°C on Wed night). Wind will be generally light. | ||||||||||||||||||||||
Sun 07 | Monday 08 | Tuesday 09 | Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||
| PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |||
Rating (10 max) | |||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||||
| Period(s) (?) | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 8 | 10 | 12 | 12 | 12 | 11 | 11 | 10 | 7 | 8 | 8 | 9 | ||
Wave (?)Graph  | |||||||||||||||||||||||
 kJ (?) | 80 | 96 | 66 | 74 | 94 | 198 | 306 | 994 | 619 | 270 | 289 | 1401 | 1672 | 1319 | 899 | 718 | 363 | 352 | 454 | 181 | 117 | ||
Wind (km/h) | |||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross- off | off | off | cross- off | cross- on | cross- off | cross | cross | cross- on | glass | on | off | cross | ||
High Tide / height (m) | 4:21AM 8:28AM 0.61 0.61 | 2:40PM 0.64 | 4:54AM 9:54AM 0.55 0.59 | 3:21PM 0.65 | 5:32AM 10:53AM 0.50 0.57 | 4:10PM 0.63 | 6:20AM 11:26AM 0.47 0.54 | 5:08PM 0.59 | 11:39AM 0.52 | 6:27PM 0.54 | 11:27AM 0.50 | 8:49PM 0.52 | 10:53AM 0.51 | ||||||||||
Low Tide / height (m) | 10:13PM 0.05 | 6:24AM 11:38AM 0.59 0.54 | 11:06PM 0.09 | 6:41AM 0.53 | 12:16PM 0.56 | 12:05AM 0.15 | 7:11AM 0.48 | 1:00PM 0.55 | 1:08AM 0.20 | 7:42AM 0.46 | 1:55PM 0.51 | 2:12AM 0.24 | 2:54PM 0.45 | 3:17AM 0.27 | 3:52PM 0.38 | 4:19AM 0.29 | |||||||
Sun 07 | Monday 08 | Tuesday 09 | Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||
| Sunrise | - | - | 5:09 | - | - | 5:09 | - | - | 5:09 | - | - | 5:11 | - | - | 5:11 | - | - | 5:11 | - | - | 5:11 | ||
| Sunset | 7:00 | - | - | 7:01 | - | - | 7:01 | - | - | 7:02 | - | - | 7:04 | - | - | 7:04 | - | - | 7:05 | - | - | ||
 |  | | |  |  | |  |  | | | | | |  |  |  | |  | | | |||
Rain (mm) | - | - | - | - | - | 35 | 26 | - | - | - | - | - | - | - | - | 8 | 11 | - | 2 | - | - | ||
| Temp. °C | 27 | 22 | 26 | 25 | 22 | 22 | 23 | 23 | 27 | 27 | 22 | 27 | 26 | 22 | 28 | 24 | 21 | 25 | 26 | 22 | 24 | ||
| Feels °C (?) | 26 | 22 | 24 | 24 | 22 | 21 | 22 | 23 | 25 | 26 | 21 | 26 | 26 | 23 | 27 | 24 | 22 | 27 | 28 | 24 | 25 | ||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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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.
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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 12 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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