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:
Backwash surfForecast / Golfo Dulce / Costa Rica
48hr Weather and Surf, issued 5 am Saturday 13 Dec 2025 CSTForecast update in hr min s Forecast update imminent
Backwash surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Backwash sea temperature is
28.9° C
(Which is slightly warmer than usual)How big are the waves at Backwash today?
The current surf forecast for Backwash at 12PM is: 1.0m 7s primary swell from a South-southwest direction and 0.5m 12s secondary swell from a South-southwest direction (forecast issued at 05:00am December 13). The wind direction is predicted to be cross-offshore.
| Time (CST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Dec) | 3.5ft (1.1m) | 7s |
| Afternoon (13 Dec) | 3.5ft (1.0m) | 7s |
| Evening (13 Dec) | 3ft (0.9m) | 7s |
Table - waves today at Backwash. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 13 | Sunday 14 | Monday 15 | Tue 16 | |||||||||||||||||||||
| 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 | 0 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 15 | 6 | 6 | 6 | 6 | 6 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 132 | 108 | 108 | 88 | 85 | 83 | 68 | 66 | 66 | 66 | 64 | 64 | 69 | 82 | 85 | 85 | 100 | 82 | 91 | 88 | 88 | 88 | 64 | 64 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | glass | glass | cross- off | cross- off | cross- off | off | off | off | glass | glass | cross- off | cross- off | cross- off | off | off | off | glass | glass | glass | cross- off | cross- off | glass | glass |
High Tide / height (m) | 9:26AM 2.29 | 9:56PM 2.53 | 10:31AM 2.23 | 10:51PM 2.50 | 11:32AM 2.24 | 11:43PM 2.51 | ||||||||||||||||||
Low Tide / height (m) | 3:22AM 0.82 | 3:31PM 0.84 | 4:24AM 0.83 | 4:31PM 0.92 | 5:22AM 0.79 | 5:27PM 0.94 | ||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | Tue 16 | |||||||||||||||||||||
| Sunrise | - | 5:37 | - | - | - | - | - | - | - | 5:37 | - | - | - | - | - | - | - | 5:37 | - | - | - | - | - | - |
| Sunset | - | - | - | - | 5:15 | - | - | - | - | - | - | - | 5:15 | - | - | - | - | - | - | - | 5:16 | - | - | - |
 |  | | | |  | |  | |  | | | | | | | | | | | | | | | |
Rain (mm) | - | 1 | 1 | 1 | 3 | 5 | 3 | - | 1 | - | - | - | 1 | 1 | 2 | 2 | 3 | 1 | 1 | 3 | 5 | 3 | - | 2 |
| Temp. °C | 25 | 25 | 26 | 27 | 27 | 26 | 26 | 25 | 25 | 24 | 26 | 27 | 27 | 26 | 25 | 25 | 24 | 24 | 26 | 26 | 26 | 26 | 25 | 25 |
| Feels °C (?) | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 28 | 29 | 28 | 30 | 30 | 29 | 29 | 29 | 29 | 28 | 28 | 31 | 30 | 30 | 30 | 29 | 29 |
- 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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