Buy Less, Surf More This Black Friday
Surf-forecast is providing a free, all-access pass to our premium features and 12-day forecasts all weekend.
Surf Forecasts:
Siriu surfForecast / Santa Catarina – Sul / Brazil
48hr Weather and Surf, issued 2 am Wednesday 10 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
22.7° C
(Which is 1.0°C colder than average for this time of year)How big are the waves at Siriu today?
The current surf forecast for Siriu at 9AM is: 1.7m 9s primary swell from a East-northeast direction and 0.4m 10s secondary swell from a South-southeast direction (forecast issued at 02:00am December 10). The wind direction is predicted to be cross-offshore and the swell rating is 2.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (10 Dec) | 5.5ft (1.7m) | 9s |
| Afternoon (10 Dec) | 5ft (1.5m) | 9s |
| Evening (10 Dec) | 5ft (1.5m) | 10s |
Table - waves today at Siriu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 10 | Thursday 11 | Friday 12 | ||||||||||||||||||||||
| 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    | |||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 8 | 8 | 8 | 9 | 9 | 9 | 10 | 10 | 10 | 11 | 11 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 545 | 418 | 389 | 408 | 424 | 393 | 419 | 407 | 349 | 881 | 1465 | 2284 | 2354 | 4079 | 2089 | 1744 | 1505 | 1132 | 908 | 808 | 730 | 668 | 586 | 521 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | cross- off | cross- off | cross- off | cross- off | off | off | off | off | off | cross- off | cross- off | cross | cross | glass | cross- off | cross- off | cross- off | cross | cross- on | cross- on | cross | cross- off |
High Tide / height (m) | 5:32AM 0.50 | 10:53AM 0.57 | 4:10PM 0.63 | 6:20AM 0.47 | 11:26AM 0.54 | 5:08PM 0.59 | 11:39AM 0.52 | 6:27PM 0.54 | ||||||||||||||||
Low Tide / height (m) | 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 | ||||||||||||||||
Wednesday 10 | Thursday 11 | Friday 12 | ||||||||||||||||||||||
| Sunrise | - | - | 5:09 | - | - | - | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:11 | - | - | - | - | - |
| Sunset | - | - | - | - | - | - | 7:02 | - | - | - | - | - | - | - | 7:04 | - | - | - | - | - | - | - | 7:04 | - |
 | |  |  | | | |  | | | | | | | | | | | | |  | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 22 | 21 | 21 | 24 | 26 | 25 | 25 | 23 | 22 | 20 | 19 | 25 | 27 | 27 | 24 | 22 | 21 | 20 | 20 | 24 | 27 | 26 | 24 | 24 |
| Feels °C (?) | 24 | 23 | 21 | 24 | 24 | 23 | 21 | 21 | 19 | 19 | 17 | 24 | 25 | 24 | 23 | 23 | 21 | 20 | 20 | 23 | 26 | 27 | 25 | 24 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Latest Updates
Quiksilver Teams Up With PrimaLoft® For World’s First Thermal Layering System for a Wetsuit.
Previously used in our snow jackets for mountain conditions, PrimaLoft® technology is making its debut in the surf industry. The aim is to bring mountain-grade warmth to the waves.
Vancouver Island’s Day Of Days With Reed Platenius
Surf-Forecast recently helped the 21-year-old Canadian pro surfer and adventurer score some cold water perfection at home.
5 Reasons Why Costa Rica Is A Surfer (and Non Surfer) Paradise
With or without a surfboard, Costa Rica is a bucket list destination that has shown what a nation is capable of when nature is put first.
Read more
Discover more articles and updates in the Greenroom.
FREE! Surf-Forecast.com widget for your website
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.
Nearest