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:
Aha Rivermouth surfForecast / Okinawa / Japan
48hr Weather and Surf, issued 2 am Tuesday 16 Dec 2025 JSTForecast update in hr min s Forecast update imminent
Aha Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Aha Rivermouth sea temperature is
24.4° C
(Which is slightly warmer than usual)How big are the waves at Aha Rivermouth today?
The current surf forecast for Aha Rivermouth at 4AM is: 1.0m 8s primary swell from a North-northwest direction and 0.7m 10s secondary swell from a East direction, 0.6m 5s secondary swell from a East-northeast direction (forecast issued at 02:00am December 16). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Dec) | 2.5ft (0.7m) | 10s |
| Afternoon (16 Dec) | 2.5ft (0.7m) | 9s |
| Evening (16 Dec) | 2.5ft (0.7m) | 10s |
Table - waves today at Aha Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 16 | Wednesday 17 | Thursday 18 | ||||||||||||||||||||||
| 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 | 9 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    | |||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 8 | 8 | 8 | 10 | 9 | 9 | 9 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 6 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 168 | 145 | 102 | 90 | 111 | 83 | 85 | 87 | 90 | 67 | 64 | 60 | 59 | 57 | 57 | 57 | 57 | 45 | 62 | 61 | 62 | 68 | 44 | 68 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross | glass | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | on | on |
High Tide / height (m) | 4:52AM 1.32 | 4:03PM 1.57 | 5:40AM 1.38 | 4:38PM 1.60 | 6:20AM 1.44 | 5:11PM 1.62 | ||||||||||||||||||
Low Tide / height (m) | 10:19PM 0.43 | 10:03AM 0.86 | 11:01PM 0.32 | 10:49AM 0.89 | 11:37PM 0.23 | 11:29AM 0.90 | ||||||||||||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | ||||||||||||||||||||||
| Sunrise | - | - | - | 7:07 | - | - | - | - | - | - | - | 7:07 | - | - | - | - | - | - | - | 7:07 | - | - | - | - |
| Sunset | - | - | - | - | - | 5:36 | - | - | - | - | - | - | - | 5:36 | - | - | - | - | - | - | - | 5:37 | - | - |
 |  | |  |  | |  | | | | |  | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 19 | 19 | 20 | 20 | 20 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Feels °C (?) | 16 | 16 | 16 | 16 | 17 | 18 | 18 | 16 | 17 | 18 | 18 | 18 | 20 | 21 | 20 | 19 | 19 | 18 | 17 | 16 | 17 | 17 | 17 | 18 |
- 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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