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:
Castles Beach surfForecast / HAW – Oahu / USA
48hr Weather and Surf, issued 7 pm Saturday 13 Dec 2025 HSTForecast update in hr min s Forecast update imminent
Castles Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Castles Beach sea temperature is
25.7° C
(Which is slightly warmer than usual)How big are the waves at Castles Beach today?
The current surf forecast for Castles Beach at 1AM is: 0.4m 8s primary swell from a East direction and 0.4m 5s secondary swell from a South-southeast direction (forecast issued at 07:00pm December 13). An open ocean swell of 0.9m 10s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (14 Dec) | 2ft (0.6m) | 5s |
| Afternoon (14 Dec) | - | - |
| Evening (14 Dec) | 1.5ft (0.4m) | 8s |
Table - waves today at Castles Beach. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 8 | 8 | 8 | 8 | 8 | 5 | 11 | 12 | 14 | 8 | 8 | 8 | 8 | 16 | 8 | 8 | 8 | 8 | 8 | 8 | 5 | 5 | 7 | 7 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 20 | 20 | 20 | 20 | 19 | 16 | 0 | 0 | 0 | 19 | 19 | 24 | 39 | 0 | 31 | 31 | 31 | 31 | 31 | 41 | 11 | 17 | 28 | 27 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | off | off | glass | glass | glass | glass | cross- off | cross- off | cross- off | cross | cross | cross | cross | cross | cross- off | cross- off | cross- off | cross- off | cross | cross- off |
High Tide / height (m) | 12:23AM 0.64 | 9:32AM 0.53 | 12:54AM 0.72 | 10:18AM 0.49 | 1:24AM 0.78 | 11:05AM 0.47 | ||||||||||||||||||
Low Tide / height (m) | 4:35PM 0.20 | 6:10AM 0.50 | 5:02PM 0.16 | 7:28AM 0.47 | 5:32PM 0.13 | 8:17AM 0.44 | ||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 7:00 | - | - | - | - | - | - | - | 7:00 | - | - | - | - | - | - | - | 7:01 | - | - |
| Sunset | 5:50 | - | - | - | - | - | - | - | 5:50 | - | - | - | - | - | - | - | 5:51 | - | - | - | - | - | - | - |
 |  |  | | |  |  | | | |  | | |  | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | 1 | - | 2 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 25 | 25 | 24 | 24 | 24 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 25 | 26 |
| Feels °C (?) | 24 | 25 | 24 | 25 | 26 | 26 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 25 | 26 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 25 |
- 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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