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Surf Forecasts:
Siriu surfForecast / Santa Catarina – Sul / Brazil
48hr Weather and Surf, issued 2 pm 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 5PM is: 1.6m 10s primary swell from a East-northeast direction and 0.4m 11s secondary swell from a South-southeast direction (forecast issued at 02:00pm December 10). An open ocean swell of 0.4m 4s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (10 Dec) | - | - |
| Afternoon (10 Dec) | 5ft (1.6m) | 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 | Saturday 13 | |||||||||||||||||||||
| 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 | 0 AM | 3 AM | 6 AM | 9 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 9 | 10 | 10 | 10 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 398 | 415 | 435 | 416 | 687 | 1480 | 2020 | 2165 | 2012 | 1979 | 3637 | 1882 | 1531 | 1338 | 990 | 883 | 705 | 607 | 520 | 451 | 388 | 331 | 275 | 214 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | cross- off | off | off | off | off | cross- off | cross- off | cross | cross | glass | glass | cross- off | cross- off | cross- on | on | cross- on | cross | cross- off | cross | cross- off | cross | cross |
High Tide / height (m) | 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) | 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 | |||||||||||||||||
Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:11 | - |
| Sunset | - | - | 7:02 | - | - | - | - | - | - | - | 7:04 | - | - | - | - | - | - | - | 7:04 | - | - | - | - | - |
 | |  |  | |  |  | | | | | | | | | | |  | |  | | | | | |
Rain (mm) | - | - | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 27 | 27 | 21 | 21 | 21 | 20 | 20 | 25 | 27 | 27 | 25 | 22 | 21 | 20 | 20 | 24 | 27 | 25 | 25 | 23 | 23 | 23 | 22 | 24 |
| Feels °C (?) | 25 | 26 | 21 | 21 | 20 | 19 | 18 | 23 | 25 | 24 | 24 | 23 | 22 | 20 | 20 | 24 | 27 | 25 | 26 | 24 | 23 | 22 | 21 | 24 |
- 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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