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 2 am Friday 19 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
24.2° C
(Which is normal for this time of year)How big are the waves at Siriu today?
The current surf forecast for Siriu at 10AM is: 0.4m 8s primary swell from a East-northeast direction and 0.3m 8s secondary swell from a South direction, 0.5m 4s secondary swell from a Northeast direction (forecast issued at 02:00am December 19). The wind direction is predicted to be cross-onshore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (19 Dec) | 1.5ft (0.4m) | 8s |
| Afternoon (19 Dec) | 1.5ft (0.4m) | 8s |
| Evening (19 Dec) | 2.5ft (0.7m) | 5s |
Table - waves today at Siriu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 19 | Saturday 20 | Sunday 21 | ||||||||||||||||||||||
| 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 | 5 | 8 | 8 | 8 | 8 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 32 | 23 | 23 | 23 | 59 | 22 | 24 | 23 | 18 | 24 | 34 | 34 | 54 | 48 | 48 | 69 | 111 | 253 | 271 | 180 | 205 | 214 | 170 | 145 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross- off | cross- off | cross- on | cross- on | cross- on | cross- on | cross | cross | cross | cross | cross- on | cross- on | cross- on | cross- on | cross | cross | cross | cross | cross | cross- on | cross- on | cross- on | cross |
High Tide / height (m) | 1:02PM 0.61 | 2:19AM 0.74 | 1:33PM 0.64 | 2:51AM 0.74 | 2:05PM 0.66 | |||||||||||||||||||
Low Tide / height (m) | 8:16AM 0.31 | 7:55PM 0.05 | 8:50AM 0.32 | 8:33PM 0.03 | 9:24AM 0.34 | |||||||||||||||||||
Friday 19 | Saturday 20 | Sunday 21 | ||||||||||||||||||||||
| Sunrise | - | - | 5:13 | - | - | - | - | - | - | - | 5:13 | - | - | - | - | - | - | - | 5:13 | - | - | - | - | - |
| Sunset | - | - | - | - | - | - | 7:07 | - | - | - | - | - | - | - | 7:08 | - | - | - | - | - | - | - | 7:09 | - |
 | |  | | | | | | | |  | | | | | | | | | | | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 20 | 19 | 19 | 25 | 27 | 26 | 24 | 21 | 21 | 21 | 21 | 25 | 26 | 25 | 24 | 22 | 22 | 22 | 22 | 25 | 28 | 28 | 25 | 23 |
| Feels °C (?) | 19 | 18 | 18 | 24 | 25 | 25 | 23 | 21 | 21 | 22 | 22 | 24 | 23 | 22 | 22 | 21 | 22 | 22 | 22 | 24 | 26 | 26 | 24 | 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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