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Surf Forecasts:
Siriu surfForecast / Santa Catarina – Sul / Brazil
48hr Weather and Surf, issued 2 pm Tuesday 09 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
22.4° C
(Which is 1.2°C colder than average for this time of year)How big are the waves at Siriu today?
The current surf forecast for Siriu at 8PM is: 1.9m 7s primary swell from a Northeast direction and 1.6m 7s secondary swell from a East-northeast direction, 0.2m 9s secondary swell from a South-southeast direction (forecast issued at 02:00pm December 09). The wind direction is predicted to be cross-shore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (09 Dec) | - | - |
| Afternoon (09 Dec) | 6.5ft (2.0m) | 7s |
| Evening (09 Dec) | 6ft (1.9m) | 7s |
Table - waves today at Siriu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 09 | Wednesday 10 | Thursday 11 | Friday 12 | |||||||||||||||||||||
| 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) (?) | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 10 | 10 | 9 | 11 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 311 | 353 | 352 | 394 | 283 | 376 | 353 | 596 | 298 | 241 | 284 | 264 | 417 | 1288 | 2284 | 2354 | 2315 | 1944 | 1656 | 1478 | 1363 | 1279 | 1027 | 828 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross | cross | cross- off | cross- off | cross- off | cross- off | cross- off | off | cross- off | cross- off | off | off | cross- off | cross- off | cross- on | cross- on | glass | glass | cross- off | cross- off | cross- off | cross |
High Tide / height (m) | 9:54AM 0.59 | 3:21PM 0.65 | 5:32AM 0.50 | 10:53AM 0.57 | 4:10PM 0.63 | 6:20AM 0.47 | 11:26AM 0.54 | 5:08PM 0.59 | ||||||||||||||||
Low Tide / height (m) | 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 | ||||||||||||||||
Tuesday 09 | Wednesday 10 | Thursday 11 | Friday 12 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 5:09 | - | - | - | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:11 | - |
| Sunset | - | - | 7:01 | - | - | - | - | - | - | - | 7:02 | - | - | - | - | - | - | - | 7:04 | - | - | - | - | - |
 |  |  |  |  |  |  |  | | | | | | |  | | | | | | | | | | |
Rain (mm) | 12 | 7 | 4 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 22 | 23 | 23 | 23 | 22 | 22 | 22 | 25 | 27 | 27 | 23 | 23 | 21 | 19 | 19 | 24 | 26 | 25 | 24 | 22 | 21 | 20 | 20 | 24 |
| Feels °C (?) | 22 | 24 | 24 | 24 | 23 | 23 | 22 | 25 | 25 | 24 | 21 | 21 | 19 | 18 | 18 | 23 | 25 | 25 | 26 | 24 | 21 | 20 | 20 | 23 |
- 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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