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:
Damas Rivermouth surfForecast / Golfo de Nicoya / Costa Rica
48hr Weather and Surf, issued 5 pm Tuesday 16 Dec 2025 CSTForecast update in hr min s Forecast update imminent
Damas Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Damas Rivermouth sea temperature is
28.4° C
(Which is slightly warmer than usual)How big are the waves at Damas Rivermouth today?
The current surf forecast for Damas Rivermouth at 12AM is: 0.6m 15s primary swell from a Southwest direction and 0.7m 6s secondary swell from a South-southwest direction (forecast issued at 05:00pm December 16). The wind direction is predicted to be offshore and the swell rating is 2.
| Time (CST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | - | - |
| Afternoon (17 Dec) | 1.5ft (0.4m) | 12s |
| Evening (17 Dec) | 1.5ft (0.4m) | 14s |
Table - waves today at Damas Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 16 | Wednesday 17 | Thursday 18 | Friday 19 | |||||||||||||||||||||
| 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 | 12 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 13 | 13 | 14 | 15 | 15 | 15 | 15 | 15 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 53 | 63 | 74 | 134 | 134 | 104 | 75 | 75 | 39 | 55 | 84 | 109 | 111 | 111 | 87 | 87 | 61 | 84 | 58 | 53 | 52 | 52 | 52 | 52 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | glass | glass | off | off | cross- off | glass | on | on | glass | glass | glass | off | off | glass | cross- on | cross- on | glass | glass | glass | off | off | glass | cross- on |
High Tide / height (m) | 12:21PM 2.04 | 12:29AM 2.32 | 1:09PM 2.10 | 1:14AM 2.37 | 1:53PM 2.16 | 1:56AM 2.42 | ||||||||||||||||||
Low Tide / height (m) | 6:15PM 0.81 | 6:59AM 0.57 | 7:03PM 0.75 | 7:42AM 0.48 | 7:46PM 0.69 | 8:22AM 0.41 | ||||||||||||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | Friday 19 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 5:46 | - | - | - | - | - | - | - | 5:46 | - | - | - | - | - | - | - | 5:47 | - | - |
| Sunset | 5:20 | - | - | - | - | - | - | - | 5:20 | - | - | - | - | - | - | - | 5:20 | - | - | - | - | - | - | - |
 |  |  | |  |  | | | | | | | | | | | | | | | | | | | |
Rain (mm) | - | 1 | - | - | - | - | - | - | - | 2 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 27 | 26 | 25 | 24 | 24 | 23 | 27 | 27 | 27 | 26 | 25 | 25 | 24 | 23 | 26 | 27 | 27 | 26 | 25 | 24 | 24 | 23 | 26 | 27 |
| Feels °C (?) | 30 | 30 | 29 | 27 | 26 | 24 | 30 | 29 | 30 | 31 | 29 | 29 | 27 | 25 | 29 | 29 | 30 | 29 | 28 | 27 | 26 | 25 | 29 | 28 |
- 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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