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 pm Sunday 21 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
23.9° C
(Which is normal for this time of year)How big are the waves at Siriu today?
The current surf forecast for Siriu at 6PM is: 1.5m 6s primary swell from a Northeast direction and 0.3m 13s secondary swell from a South-southeast direction, 0.2m 11s secondary swell from a South direction (forecast issued at 02:00pm December 21). The wind direction is predicted to be cross-shore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Dec) | - | - |
| Afternoon (21 Dec) | 5ft (1.6m) | 6s |
| Evening (21 Dec) | 4ft (1.2m) | 6s |
Table - waves today at Siriu. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | |||||||||||||||||||||
| 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) (?) | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 175 | 196 | 170 | 112 | 137 | 192 | 317 | 331 | 263 | 287 | 270 | 413 | 485 | 485 | 434 | 423 | 285 | 302 | 285 | 245 | 212 | 212 | 159 | 151 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross | cross | cross | cross | cross | cross- on | cross- on | cross- on | cross- on | cross | cross | cross | cross | cross | cross- on | cross- on | cross- on | cross | cross | glass | cross- off | cross |
High Tide / height (m) | 2:05PM 0.66 | 3:23AM 0.72 | 2:40PM 0.68 | 3:59AM 0.70 | 3:17PM 0.69 | 4:38AM 0.67 | ||||||||||||||||||
Low Tide / height (m) | 9:24AM 0.34 | 9:13PM 0.03 | 10:01AM 0.35 | 9:57PM 0.04 | 10:42AM 0.37 | 10:46PM 0.06 | ||||||||||||||||||
Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 5:15 | - | - | - | - | - | - | - | 5:15 | - | - | - | - | - | - | - | 5:16 | - |
| Sunset | - | - | 7:09 | - | - | - | - | - | - | - | 7:09 | - | - | - | - | - | - | - | 7:10 | - | - | - | - | - |
 |  | |  | |  | | | |  | | | | | | | | | | | | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | 2 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 29 | 28 | 25 | 23 | 23 | 22 | 22 | 26 | 29 | 26 | 24 | 23 | 23 | 23 | 23 | 28 | 30 | 30 | 27 | 26 | 26 | 25 | 25 | 27 |
| Feels °C (?) | 27 | 26 | 24 | 22 | 22 | 22 | 22 | 25 | 28 | 27 | 25 | 24 | 24 | 24 | 23 | 28 | 29 | 30 | 28 | 29 | 29 | 28 | 28 | 29 |
- 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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