Using Surf-Forecast’s Historical Surf Data To Find The Most Consistent Waves On Earth
Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Siriu surfForecast / Santa Catarina – Sul / Brazil
48hr Weather and Surf, issued 8 am Wednesday 31 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
26.0° C
(Which is 1.3°C warmer than normal for this time of year)How big are the waves at Siriu today?
The current surf forecast for Siriu at 11AM is: 1.6m 14s primary swell from a South-southeast direction and 0.8m 6s secondary swell from a East direction (forecast issued at 08:00am December 31). The wind direction is predicted to be cross-offshore and the swell rating is 3.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 Dec) | 5.5ft (1.7m) | 14s |
| Afternoon (31 Dec) | 4.5ft (1.4m) | 13s |
| Evening (31 Dec) | 4ft (1.2m) | 12s |
Table - waves today at Siriu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 31 | Thursday 01 | Friday 02 | Sat 03 | |||||||||||||||||||||
| 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 | 0 AM | 3 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 14 | 14 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 10 | 10 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 1303 | 1080 | 836 | 613 | 572 | 454 | 373 | 355 | 270 | 251 | 202 | 156 | 141 | 106 | 106 | 100 | 71 | 70 | 44 | 43 | 70 | 100 | 127 | 405 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross | glass | glass | glass | glass | glass | cross- off | glass | on | glass | glass | glass | cross- off | cross- off | off | glass | cross- on | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 12:37PM 0.49 | 1:46AM 0.78 | 12:38PM 0.49 | 2:29AM 0.80 | 12:49PM 0.51 | |||||||||||||||||||
Low Tide / height (m) | 6:59AM 0.24 | 6:36PM 0.12 | 7:56AM 0.27 | 7:21PM 0.05 | 8:42AM 0.31 | 8:04PM -0.00 | ||||||||||||||||||
Wednesday 31 | Thursday 01 | Friday 02 | Sat 03 | |||||||||||||||||||||
| Sunrise | 5:20 | - | - | - | - | - | - | - | 5:20 | - | - | - | - | - | - | - | 5:20 | - | - | - | - | - | - | - |
| Sunset | - | - | - | - | 7:14 | - | - | - | - | - | - | - | 7:14 | - | - | - | - | - | - | - | 7:14 | - | - | - |
 |  |  |  | |  |  |  |  | | | | |  | | | | | | | | | |  | |
Rain (mm) | 1 | - | - | 2 | 2 | 3 | 1 | - | - | - | - | 2 | 1 | - | 1 | 1 | 1 | - | 1 | 11 | 1 | 1 | - | - |
| Temp. °C | 23 | 24 | 26 | 25 | 25 | 24 | 23 | 23 | 23 | 26 | 28 | 26 | 26 | 25 | 25 | 24 | 23 | 27 | 27 | 23 | 26 | 24 | 23 | 22 |
| Feels °C (?) | 26 | 26 | 29 | 30 | 30 | 29 | 27 | 27 | 26 | 30 | 31 | 30 | 30 | 29 | 29 | 27 | 26 | 31 | 29 | 26 | 30 | 27 | 25 | 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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