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:
Rio Claro surfForecast / Golfo Dulce / Costa Rica
48hr Weather and Surf, issued 11 pm Friday 12 Dec 2025 CSTForecast update in hr min s Forecast update imminent
Rio Claro surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Rio Claro sea temperature is
28.7° C
(Which is slightly warmer than usual)How big are the waves at Rio Claro today?
The current surf forecast for Rio Claro at 2AM is: 1.1m 7s primary swell from a South-southwest direction and 0.5m 12s secondary swell from a South-southwest direction (forecast issued at 11:00pm December 12). The wind direction is predicted to be glassy and the swell rating is 2.
| 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) | 3.5ft (1.0m) | 7s |
Table - waves today at Rio Claro. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 13 | Sunday 14 | Monday 15 | ||||||||||||||||||||||
| 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 | 6 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 11 | 11 | 15 | 15 | 15 | 6 | 6 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 105 | 108 | 132 | 111 | 108 | 88 | 88 | 85 | 85 | 96 | 96 | 93 | 91 | 71 | 71 | 69 | 47 | 43 | 55 | 54 | 54 | 55 | 55 | 53 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | glass | glass | glass | glass | cross- on | cross | cross- off | cross- off | cross- off | cross- off | glass | glass | cross- on | cross | cross | cross- off | cross- off | cross- off | glass | glass | glass | glass | glass |
High Tide / height (m) | 9:25AM 2.24 | 9:55PM 2.48 | 10:29AM 2.18 | 10:51PM 2.45 | 11:30AM 2.18 | |||||||||||||||||||
Low Tide / height (m) | 3:22AM 0.79 | 3:31PM 0.81 | 4:24AM 0.80 | 4:30PM 0.89 | 5:21AM 0.77 | 5:26PM 0.91 | ||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | ||||||||||||||||||||||
| Sunrise | - | - | - | 5:39 | - | - | - | - | - | - | - | 5:39 | - | - | - | - | - | - | - | 5:39 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 5:16 | - | - | - | - | - | - | - | 5:17 | - | - | - | - | - | - | - | 5:17 | - |
 |  | |  | | | | | | | |  | | | | | | | | | | | | | |
Rain (mm) | 2 | - | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | - | - | 1 | 1 | - | - | 3 | 3 | 1 | 3 | 3 | 2 | 1 |
| Temp. °C | 26 | 25 | 25 | 25 | 26 | 27 | 27 | 25 | 25 | 25 | 25 | 25 | 27 | 27 | 27 | 26 | 26 | 25 | 25 | 25 | 26 | 26 | 27 | 26 |
| Feels °C (?) | 31 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 32 | 31 | 30 | 29 | 30 | 29 | 29 | 29 | 31 | 30 | 31 | 30 |
- 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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