Nazare Big Wave Challenge Gets Yellow Alert, Could Run Saturday in Giant Waves
70-foot plus waves predicted for Portuguese big wave tow surfing competition.
Surf Forecasts:
Cassino surfForecast / Rio Grande Do Sul / Brazil
48hr Weather and Surf, issued 8 pm Saturday 13 Dec 2025 -03Forecast update in hr min s Forecast update imminent
Cassino surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Cassino sea temperature is
22.2° C
(Which is slightly warmer than usual)How big are the waves at Cassino today?
The current surf forecast for Cassino at 10PM is: 0.7m 9s primary swell from a Southeast direction and 0.3m 9s secondary swell from a East direction, 0.3m 3s secondary swell from a East-northeast direction (forecast issued at 08:00pm December 13). The wind direction is predicted to be cross-onshore.
| Time (-03) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Dec) | - | - |
| Afternoon (13 Dec) | - | - |
| Evening (13 Dec) | 2.5ft (0.7m) | 9s |
Table - waves today at Cassino. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sat 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| 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 | 12 PM | 3 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |   |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 9 | 10 | 9 | 9 | 10 | 10 | 10 | 10 | 5 | 5 | 5 | 10 | 10 | 7 | 7 | 7 | 5 | 5 | 5 | 6 | 10 | 5 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 87 | 85 | 88 | 71 | 55 | 57 | 61 | 61 | 67 | 86 | 74 | 64 | 34 | 33 | 44 | 36 | 36 | 46 | 42 | 37 | 51 | 17 | 46 | 71 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | cross- on | cross- on | cross | cross- on | cross- on | cross- on | cross- on | on | cross- on | cross- on | cross- on | cross | cross | cross- off | cross | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross |
High Tide / height (m) | 3:10PM 0.41 | 8:45PM 0.26 | 3:45AM 0.33 | 10:09AM 0.27 | 4:11PM 0.35 | 10:46PM 0.30 | 4:37AM 0.35 | 11:04AM 0.29 | 5:12PM 0.30 | 11:52PM 0.36 | 5:25AM 0.37 | 11:50AM 0.29 | ||||||||||||
Low Tide / height (m) | 7:29PM 0.25 | 11:59PM 0.20 | 7:18AM 0.21 | 12:37PM 0.23 | 7:43PM 0.22 | 1:20AM 0.25 | 8:13AM 0.21 | 2:05PM 0.20 | 8:15PM 0.19 | 2:32AM 0.29 | 9:02AM 0.20 | |||||||||||||
Sat 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| Sunrise | - | - | - | - | 5:15 | - | - | - | - | - | - | - | 5:16 | - | - | - | - | - | - | - | 5:16 | - | - | - |
| Sunset | 7:29 | - | - | - | - | - | - | - | 7:30 | - | - | - | - | - | - | - | 7:30 | - | - | - | - | - | - | - |
 |  | | | | | | | | |  | |  |  | |  | |  |  | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 3 | 3 | - | - | - | - | - | - |
| Temp. °C | 25 | 24 | 23 | 22 | 22 | 24 | 25 | 25 | 23 | 22 | 21 | 22 | 23 | 25 | 25 | 22 | 20 | 20 | 20 | 19 | 18 | 20 | 22 | 22 |
| Feels °C (?) | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 22 | 21 | 21 | 22 | 23 | 27 | 24 | 20 | 19 | 21 | 19 | 17 | 17 | 17 | 18 | 17 |
- Map Icons:
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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