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 Monday 15 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
28.7° C
(Which is slightly warmer than usual)How big are the waves at Backwash today?
The current surf forecast for Backwash at 8AM is: 1.1m 6s primary swell from a South-southwest direction and 0.4m 11s secondary swell from a Southwest direction (forecast issued at 05:00am December 15). The wind direction is predicted to be glassy.
| Time (CST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Dec) | 3.5ft (1.0m) | 6s |
| Afternoon (15 Dec) | 3.5ft (1.1m) | 6s |
| Evening (15 Dec) | 3.5ft (1.1m) | 6s |
Table - waves today at Backwash. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Monday 15 | Tuesday 16 | Wednesday 17 | Thu 18 | |||||||||||||||||||||
| 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) (?) | 6 | 6 | 15 | 6 | 6 | 6 | 6 | 6 | 13 | 13 | 13 | 11 | 12 | 12 | 12 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 100 | 100 | 82 | 82 | 88 | 88 | 98 | 66 | 98 | 135 | 96 | 71 | 77 | 81 | 81 | 82 | 104 | 81 | 79 | 54 | 40 | 51 | 61 | 61 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | glass | glass | cross- off | cross- off | glass | glass | glass | glass | cross- on | cross- on | cross- on | cross- on | glass | glass | glass | glass | glass | glass | cross | cross | cross- off | off | off |
High Tide / height (m) | 11:32AM 2.24 | 11:43PM 2.51 | 12:25PM 2.28 | 12:32AM 2.55 | 1:12PM 2.35 | |||||||||||||||||||
Low Tide / height (m) | 5:22AM 0.79 | 5:27PM 0.94 | 6:13AM 0.71 | 6:19PM 0.91 | 6:59AM 0.62 | 7:06PM 0.84 | ||||||||||||||||||
Monday 15 | Tuesday 16 | Wednesday 17 | Thu 18 | |||||||||||||||||||||
| Sunrise | - | 5:37 | - | - | - | - | - | - | - | 5:39 | - | - | - | - | - | - | - | 5:39 | - | - | - | - | - | - |
| Sunset | - | - | - | - | 5:16 | - | - | - | - | - | - | - | 5:16 | - | - | - | - | - | - | - | 5:17 | - | - | - |
 |  | | | | | | | |  | | |  |  | | |  | | | | | | | | |
Rain (mm) | 2 | 2 | 2 | 2 | 3 | 2 | 2 | 1 | 1 | - | - | - | - | - | 3 | 1 | - | 1 | 3 | 1 | - | 1 | 1 | 1 |
| Temp. °C | 24 | 24 | 25 | 26 | 26 | 25 | 24 | 24 | 24 | 24 | 25 | 26 | 27 | 26 | 25 | 25 | 24 | 24 | 25 | 26 | 27 | 26 | 25 | 24 |
| Feels °C (?) | 28 | 28 | 29 | 30 | 30 | 30 | 29 | 28 | 28 | 28 | 28 | 29 | 30 | 30 | 29 | 30 | 28 | 28 | 29 | 29 | 29 | 29 | 28 | 27 |
- 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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