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:
Waimanalo surfForecast / HAW – Oahu / USA
48hr Weather and Surf, issued 1 pm Saturday 13 Dec 2025 HSTForecast update in hr min s Forecast update imminent
Waimanalo surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Waimanalo sea temperature is
25.7° C
(Which is slightly warmer than usual)How big are the waves at Waimanalo today?
The current surf forecast for Waimanalo at 6PM is: 1.1m 10s primary swell from a North direction and 0.4m 8s secondary swell from a East direction (forecast issued at 01:00pm December 13). An open ocean swell of 0.7m 4s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Dec) | 4.5ft (1.3m) | 11s |
| Afternoon (13 Dec) | 4ft (1.2m) | 11s |
| Evening (13 Dec) | 3.5ft (1.0m) | 10s |
Table - waves today at Waimanalo. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| 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 | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 16 | 12 | 12 | 14 | 14 | 13 | 13 | 13 | 15 | 12 | 14 | 14 | 14 | 14 | 14 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 400 | 326 | 270 | 216 | 164 | 125 | 96 | 85 | 141 | 272 | 331 | 656 | 570 | 495 | 563 | 780 | 681 | 1649 | 1581 | 1407 | 1227 | 1048 | 888 | 861 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | off | off | off | off | off | off | cross- off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | glass | cross- off |
High Tide / height (m) | 9:17AM 0.42 | 12:51AM 0.47 | 9:40AM 0.38 | 1:22AM 0.54 | 10:07AM 0.35 | 1:49AM 0.59 | ||||||||||||||||||
Low Tide / height (m) | 4:53PM 0.04 | 6:01AM 0.30 | 5:14PM 0.01 | 7:23AM 0.29 | 5:39PM -0.03 | |||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | Tuesday 16 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | - | 6:58 | - | - | - | - | - | - | - | 7:00 | - | - | - | - | - | - | - | 7:01 |
| Sunset | - | - | 5:50 | - | - | - | - | - | - | - | 5:50 | - | - | - | - | - | - | - | 5:51 | - | - | - | - | - |
 | | |  |  |  |  |  | |  | | | | | |  | | | | | | | | | |
Rain (mm) | - | - | - | - | - | 1 | - | - | - | 1 | 2 | 1 | - | - | 1 | - | 4 | 2 | - | - | - | - | - | - |
| Temp. °C | 25 | 26 | 25 | 25 | 25 | 24 | 24 | 24 | 25 | 24 | 24 | 24 | 24 | 24 | 23 | 24 | 24 | 24 | 25 | 24 | 24 | 24 | 24 | 24 |
| Feels °C (?) | 22 | 24 | 23 | 25 | 25 | 24 | 25 | 26 | 27 | 26 | 26 | 26 | 26 | 26 | 23 | 26 | 27 | 25 | 26 | 24 | 25 | 26 | 27 | 26 |
- 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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