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:
Kugenuma Rivermouth surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 am Sunday 04 Jan 2026 JSTForecast update in hr min s Forecast update imminent
Kugenuma Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Kugenuma Rivermouth sea temperature is
16.6° C
(Which is 1.3°C colder than average for this time of year)How big are the waves at Kugenuma Rivermouth today?
The current surf forecast for Kugenuma Rivermouth at 6AM is: 0.1m 8s primary swell from a Southwest direction and 0.1m 4s secondary swell from a Southwest direction (forecast issued at 02:00am January 04). The wind direction is predicted to be glassy.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (04 Jan) | 0.5ft (0.1m) | 8s |
| Afternoon (04 Jan) | 0.5ft (0.1m) | 8s |
| Evening (04 Jan) | 1.5ft (0.5m) | 8s |
Table - waves today at Kugenuma Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sunday 04 | Monday 05 | Tuesday 06 | ||||||||||||||||||||||
| 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 | 5 | 8 | 8 | 5 | 8 | 8 | 8 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 8 | 8 | 8 | 8 | 9 | 10 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 7 | 3 | 3 | 3 | 3 | 3 | 6 | 33 | 11 | 5 | 5 | 54 | 86 | 36 | 167 | 120 | 29 | 6 | 15 | 6 | 6 | 3 | 2 | 3 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | glass | glass | on | on | glass | glass | cross- off | cross- off | glass | cross | cross- on | cross- on | cross- on | cross- off | off | off | off | off | glass | glass | glass | glass |
High Tide / height (m) | 6:28AM 1.35 | 4:19PM 1.44 | 6:50AM 1.36 | 5:03PM 1.44 | 7:14AM 1.36 | 5:49PM 1.41 | ||||||||||||||||||
Low Tide / height (m) | 11:08PM -0.03 | 11:13AM 1.02 | 11:41PM -0.02 | 11:47AM 0.95 | 12:13AM 0.02 | 12:24PM 0.87 | ||||||||||||||||||
Sunday 04 | Monday 05 | Tuesday 06 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:50 | - | - | - | - | - | - | - | 6:50 | - | - | - | - | - | - | - | 6:50 | - | - | - | - |
| Sunset | - | - | - | - | - | 4:42 | - | - | - | - | - | - | - | 4:43 | - | - | - | - | - | - | - | 4:43 | - | - |
 | | |  | | | | | | | | | |  | | | | | | | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 7 | 7 | 7 | 8 | 9 | 10 | 10 | 9 | 9 | 8 | 7 | 8 | 9 | 13 | 12 | 10 | 8 | 7 | 6 | 6 | 7 | 8 | 8 | 8 |
| Feels °C (?) | 2 | 2 | 4 | 5 | 4 | 6 | 7 | 6 | 5 | 4 | 4 | 5 | 4 | 5 | 5 | 5 | -1 | -1 | -1 | 0 | 3 | 5 | 5 | 5 |
- 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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