Using Surf-Forecast’s Historical Surf Data To Find The Most Consistent Waves On Earth
Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Aha Rivermouth surfForecast / Okinawa / Japan
48hr Weather and Surf, issued 8 am Thursday 18 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
23.9° C
(Which is normal for this time of year)How big are the waves at Aha Rivermouth today?
The current surf forecast for Aha Rivermouth at 11AM is: 0.5m 9s primary swell from a East-southeast direction and 0.1m 13s secondary swell from a Northeast direction, 0.8m 6s secondary swell from a North direction (forecast issued at 08:00am December 18). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Dec) | 1.5ft (0.5m) | 9s |
| Afternoon (18 Dec) | 2.5ft (0.8m) | 6s |
| Evening (18 Dec) | 3.5ft (1.0m) | 7s |
Table - waves today at Aha Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 18 | Friday 19 | Saturday 20 | Sun 21 | |||||||||||||||||||||
| 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 | 0 AM | 3 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 9 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 8 | 9 | 9 | 9 | 6 | 6 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 9 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 45 | 45 | 54 | 51 | 92 | 97 | 77 | 63 | 48 | 51 | 82 | 82 | 39 | 53 | 74 | 136 | 199 | 214 | 214 | 181 | 183 | 244 | 281 | 288 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross- off | cross | cross | cross | cross- on | cross- on | cross | cross- off | cross- off |
High Tide / height (m) | 6:20AM 1.44 | 5:11PM 1.62 | 6:54AM 1.49 | 5:42PM 1.65 | 7:26AM 1.53 | 6:15PM 1.68 | ||||||||||||||||||
Low Tide / height (m) | 11:29AM 0.90 | 12:09AM 0.15 | 12:05PM 0.90 | 12:40AM 0.08 | 12:39PM 0.89 | 1:12AM 0.04 | ||||||||||||||||||
Thursday 18 | Friday 19 | Saturday 20 | Sun 21 | |||||||||||||||||||||
| Sunrise | - | 7:07 | - | - | - | - | - | - | - | 7:09 | - | - | - | - | - | - | - | 7:09 | - | - | - | - | - | - |
| Sunset | - | - | - | 5:37 | - | - | - | - | - | - | - | 5:37 | - | - | - | - | - | - | - | 5:37 | - | - | - | - |
 |  |  |  |  | | | | | | | | |  | | | |  |  |  |  | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 1 | - | - | 2 | 5 | 7 | 6 | 4 | 1 | 1 |
| Temp. °C | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 21 | 21 | 21 | 21 | 22 | 20 | 20 | 21 | 22 | 22 | 20 | 19 | 19 | 20 | 20 | 21 |
| Feels °C (?) | 16 | 15 | 15 | 16 | 16 | 16 | 17 | 17 | 18 | 18 | 18 | 18 | 20 | 19 | 17 | 16 | 20 | 20 | 17 | 17 | 18 | 20 | 20 | 21 |
- 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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