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Kugenuma Rivermouth surfForecast / Kanagawa / Japan
12 Day Weather and Surf, issued 2 am Sunday 31 Aug 2025 JST
Best Forecast Surf Conditions for Kugenuma Rivermouth this week:
The surf forecast for Kugenuma Rivermouth over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 04) at 3AM. The primary swell is predicted to be 0.4m and 9s period with a secondary swell of 0.5m and 7s. Another secondary swell of 0.5m and 6s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Kugenuma Rivermouth in the next 12 days are 2.1m 13s and forecast to arrive on Thursday (Sep 04) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Friday (Sep 05) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 4th Sep) | 1.5ft (0.4m) 9s |
| Best Surf | 3AM (Fri 5th Sep) | 5ft (1.6m) 11s |
| Most Powerful | 9PM (Thu 4th Sep) | 7ft (2.1m) 13s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 12 days.
Short Range Forecast Some drizzle, heaviest during Tue night. Warm (max 32°C on Sun morning, min 26°C on Tue night). Mainly fresh winds. | Days 3-6 Weather Summary Heavy rain (total 47mm), heaviest during Fri morning. Warm (max 29°C on Thu morning, min 24°C on Thu night). Winds decreasing (strong winds from the NNE on Fri afternoon, calm by Fri night). | ||||||||||||||||||||
Sunday 31 | Monday 01 | Tuesday 02 | Wednesday 03 | Thursday 04 | Friday 05 | Saturday 06 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 9 | 9 | 9 | 9 | 4 | 4 | 10 | 4 | 4 | 5 | 6 | 6 | 12 | 11 | 12 | 9 | 8 | 8 | 7 | 7 | 7 |
Wave (?)Graph  | |||||||||||||||||||||
| Energy (?) | 17 | 24 | 15 | 12 | 38 | 30 | 20 | 53 | 29 | 53 | 33 | 50 | 461 | 448 | 1186 | 133 | 88 | 60 | 36 | 68 | 31 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- on | on | on | on | on | on | on | cross- on | on | cross- on | off | off | cross- on | cross- on | glass | off | cross- off | cross- on | on | cross- on |
High Tide / height (m) | 11:32AM 1.08 | 8:40PM 1.41 | 9:17PM 1.33 | 4:39PM 1.35 | 11:40PM 1.25 | 4:37PM 1.40 | 1:50AM 1.28 | 4:47PM 1.44 | 2:59AM 1.36 | 4:58PM 1.46 | 3:47AM 1.44 | 5:10PM 1.47 | |||||||||
Low Tide / height (m) | 12:56PM 1.07 | 5:40AM 0.50 | 7:26AM 0.45 | 9:11PM 1.23 | 8:35AM 0.38 | 9:43PM 1.12 | 9:24AM 0.32 | 10:06PM 1.01 | 10:02AM 0.30 | 10:28PM 0.90 | 10:33AM 0.31 | 10:49PM 0.77 | |||||||||
Sunday 31 | Monday 01 | Tuesday 02 | Wednesday 03 | Thursday 04 | Friday 05 | Saturday 06 | |||||||||||||||
| Sunrise | 5:11 | - | - | 5:13 | - | - | 5:13 | - | - | 5:15 | - | - | 5:15 | - | - | 5:16 | - | - | 5:16 | - | - |
| Sunset | - | 6:10 | - | - | 6:09 | - | - | 6:08 | - | - | 6:07 | - | - | 6:06 | - | - | 6:04 | - | - | 6:02 | - |
 | |  | | | | |  |  | | |  | |  |  |  | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | 1 | - | - | 1 | - | 2 | 20 | 22 | 2 | - | - | - | - |
| Temp. °C | 32 | 30 | 28 | 29 | 29 | 28 | 29 | 30 | 28 | 26 | 26 | 27 | 29 | 28 | 26 | 25 | 25 | 25 | 27 | 27 | 26 |
| Feels °C (?) | 33 | 31 | 31 | 29 | 27 | 28 | 28 | 29 | 28 | 27 | 28 | 30 | 30 | 30 | 30 | 28 | 22 | 25 | 29 | 28 | 29 |
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Recent Eyeball Surf Reports for Kanagawa
Continuing clean conditions at Kugenuma Rivermouth (calm at Zushi Kanagawa 9 km from Kugenuma Rivermouth). 0.3m 4s local chop from the SSW with a 0.3m 9s swell from the SE and a 0.1m 7s swell from the SSE. 3 swells combining to make bigger set waves.
2 h 18 min ago
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Kugenuma Rivermouth surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Kugenuma Rivermouth Surf forecast
The above surf forecast table for Kugenuma Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Kugenuma Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Kugenuma Rivermouth surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Kugenuma Rivermouth) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Kugenuma Rivermouth may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
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