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 8 pm Friday 19 Dec 2025 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
18.3° C
(Which is slightly cooler than normal)How big are the waves at Kugenuma Rivermouth today?
The current surf forecast for Kugenuma Rivermouth at 2AM is: 0.1m 11s primary swell from a Southeast direction and 0.2m 4s secondary swell from a South-southeast direction (forecast issued at 08:00pm December 19). The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Dec) | 2ft (0.6m) | 4s |
| Afternoon (20 Dec) | 3.5ft (1.0m) | 5s |
| Evening (20 Dec) | 5ft (1.5m) | 6s |
Table - waves today at Kugenuma Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Fri 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||||||
| 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 | 6 AM | 9 AM | 12 PM | 3 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |   |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 11 | 11 | 13 | 4 | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 9 | 9 | 9 | 9 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 5 | 5 | 5 | 10 | 20 | 13 | 41 | 59 | 101 | 184 | 254 | 173 | 302 | 419 | 381 | 376 | 329 | 222 | 277 | 254 | 199 | 184 | 124 | 101 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | glass | glass | cross | cross- on | on | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | on | on | on | on | cross | off | off | off | off | off | off |
High Tide / height (m) | 3:17PM 1.46 | 6:19AM 1.35 | 3:55PM 1.48 | 6:48AM 1.36 | 4:36PM 1.48 | 7:17AM 1.36 | ||||||||||||||||||
Low Tide / height (m) | 10:53PM -0.01 | 10:48AM 1.08 | 11:27PM -0.03 | 11:22AM 1.05 | 12:01AM -0.01 | 12:01PM 1.01 | ||||||||||||||||||
Fri 19 | Saturday 20 | Sunday 21 | Monday 22 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 6:45 | - | - | - | - | - | - | - | 6:46 | - | - | - | - | - | - | - | 6:47 | - | - |
| Sunset | - | - | - | - | - | - | - | 4:31 | - | - | - | - | - | - | - | 4:32 | - | - | - | - | - | - | - | 4:32 |
 |  | | | |  | | |  | | |  | | | |  | | | |  | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | 1 | 1 | 4 | 9 | 1 | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 11 | 11 | 12 | 13 | 14 | 16 | 17 | 15 | 14 | 15 | 15 | 15 | 16 | 16 | 18 | 19 | 18 | 17 | 14 | 11 | 11 | 9 | 9 | 11 |
| Feels °C (?) | 9 | 9 | 10 | 11 | 12 | 13 | 14 | 13 | 12 | 14 | 13 | 11 | 14 | 14 | 14 | 14 | 15 | 15 | 7 | 3 | 1 | -1 | 0 | 3 |
- 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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