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:
Kugenuma Rivermouth surfForecast / Kanagawa / Japan
48hr Weather and Surf, issued 2 am Thursday 11 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
18.6° C
(Which is 1.0°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 10AM is: 0.2m 11s primary swell from a East-southeast direction (forecast issued at 02:00am December 11). The wind direction is predicted to be onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | 0.5ft (0.2m) | 11s |
| Afternoon (11 Dec) | 3ft (0.9m) | 4s |
| Evening (11 Dec) | 5.5ft (1.7m) | 6s |
Table - waves today at Kugenuma Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 11 | Friday 12 | Saturday 13 | ||||||||||||||||||||||
| 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) (?) | 11 | 11 | 11 | 11 | 11 | 4 | 5 | 6 | 6 | 7 | 7 | 7 | 7 | 15 | 14 | 11 | 12 | 11 | 11 | 11 | 11 | 11 | 7 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 12 | 12 | 11 | 11 | 11 | 24 | 102 | 183 | 236 | 114 | 31 | 13 | 5 | 4 | 4 | 2 | 3 | 2 | 2 | 2 | 2 | 2 | 7 | 4 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | cross- off | cross- off | glass | on | cross- on | cross- on | cross- on | cross- on | off | off | off | off | off | off | off | off | off | off | off | cross- off | cross- off | cross- off | off |
High Tide / height (m) | 9:46AM 1.31 | 8:32PM 1.15 | 10:34AM 1.31 | 10:08PM 1.05 | 11:23AM 1.30 | |||||||||||||||||||
Low Tide / height (m) | 2:30AM 0.33 | 3:45PM 0.93 | 3:23AM 0.49 | 5:20PM 0.82 | 4:28AM 0.64 | 6:38PM 0.67 | ||||||||||||||||||
Thursday 11 | Friday 12 | Saturday 13 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:39 | - | - | - | - | - | - | - | 6:39 | - | - | - | - | - | - | - | 6:41 | - | - | - | - |
| Sunset | - | - | - | - | - | 4:29 | - | - | - | - | - | - | - | 4:30 | - | - | - | - | - | - | - | 4:30 | - | - |
 | | |  |  |  |  | | | |  | | | | | | | | | | | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
| Temp. °C | 11 | 10 | 10 | 10 | 14 | 15 | 15 | 15 | 14 | 11 | 8 | 7 | 9 | 9 | 7 | 6 | 5 | 5 | 4 | 5 | 5 | 6 | 6 | 6 |
| Feels °C (?) | 8 | 6 | 6 | 8 | 9 | 6 | 6 | 5 | 4 | 5 | -3 | -3 | -1 | 1 | -1 | -2 | -1 | -1 | -2 | 0 | 1 | 2 | 1 | 1 |
- 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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