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 Saturday 13 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
24.5° C
(Which is slightly warmer than usual)How big are the waves at Aha Rivermouth today?
The current surf forecast for Aha Rivermouth at 5AM is: 1.5m 8s primary swell from a East direction and 1.1m 8s secondary swell from a North-northwest direction (forecast issued at 02:00am December 13). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Dec) | 4.5ft (1.4m) | 8s |
| Afternoon (13 Dec) | 2.5ft (0.8m) | 9s |
| Evening (13 Dec) | 4ft (1.2m) | 8s |
Table - waves today at Aha Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 13 | Sunday 14 | Monday 15 | ||||||||||||||||||||||
| 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) (?) | 7 | 8 | 8 | 8 | 8 | 9 | 9 | 8 | 6 | 7 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 212 | 256 | 263 | 222 | 163 | 99 | 141 | 185 | 237 | 588 | 728 | 1108 | 1372 | 1347 | 1166 | 679 | 556 | 718 | 651 | 518 | 380 | 318 | 238 | 177 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | on | on | on | on | cross- off | cross | cross | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | on | on |
High Tide / height (m) | 12:46AM 1.27 | 1:43PM 1.50 | 2:25AM 1.23 | 2:36PM 1.51 | 3:49AM 1.26 | 3:23PM 1.54 | ||||||||||||||||||
Low Tide / height (m) | 6:59AM 0.64 | 8:24PM 0.67 | 8:05AM 0.74 | 9:28PM 0.55 | 9:08AM 0.82 | |||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | ||||||||||||||||||||||
| Sunrise | - | - | - | 7:05 | - | - | - | - | - | - | - | 7:05 | - | - | - | - | - | - | - | 7:07 | - | - | - | - |
| Sunset | - | - | - | - | - | 5:35 | - | - | - | - | - | - | - | 5:35 | - | - | - | - | - | - | - | 5:35 | - | - |
 |  | |  |  | | | |  | |  |  | |  | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | 1 | 2 | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 21 | 19 | 18 | 16 | 17 | 17 | 16 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 19 |
| Feels °C (?) | 19 | 20 | 20 | 21 | 24 | 23 | 19 | 19 | 16 | 12 | 10 | 7 | 8 | 8 | 8 | 9 | 10 | 9 | 9 | 11 | 12 | 13 | 14 | 15 |
- 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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