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Surf Forecasts:
Kugenuma Rivermouth surfForecast / Kanagawa / Japan
16 Day Weather and Surf, issued 8 pm Friday 01 May 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
19.6° C
(Which is normal for this time of year)Best Forecast Surf Conditions for Kugenuma Rivermouth this week:
The surf forecast for Kugenuma Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (May 02) at 6AM. The primary swell is predicted to be 1.4m and 10s period with a secondary swell of 0.1m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Kugenuma Rivermouth in the next 16 days are 3.5m 8s and forecast to arrive on Monday (May 04) at 9AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 3s period and expected on Sunday (May 03) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sat 2nd May) | 4.5ft (1.4m) 10s |
| Best Surf | 3AM (Tue 5th May) | 7ft (2.1m) 9s |
| Most Powerful | 9AM (Mon 4th May) | 11ft (3.5m) 8s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 8mm), mostly falling on Mon morning. Warm (max 22°C on Mon morning, min 14°C on Fri night). Winds increasing (calm on Sat night, near gales from the SSW by Sun night). | Days 5-7 Weather SummarySome drizzle, heaviest during Mon night. Very mild (max 19°C on Mon night, min 16°C on Mon night). Winds decreasing (fresh winds from the WSW on Mon night, calm by Thu morning). | ||||||||||||||||||||
Saturday 2 | Sunday 3 | Monday 4 | Tuesday 5 | Wednesday 6 | Thursday 7 | Fri 8 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
SSW 8 | SSW 11 | SSW 10 | SSW 8 | S 6 | SSW 4 | SSW 6 | SSW 8 | SSW 9 | SSW 8 | SSW 9 | SSW 9 | S 7 | S 5 | S 5 | S 6 | SSE 6 | SSE 8 | SE 11 | SE 11 | SSW 5 | |
675 | 286 | 88 | 40 | 7 | 18 | 229 | 1493 | 878 | 424 | 106 | 30 | 8 | 17 | 28 | 23 | 23 | 39 | 18 | 18 | 91 | |
Wind (km/h) | |||||||||||||||||||||
cross-on | on | cross-on | glassy | glassy | on | on | on | on | cross-off | off | on | on | cross-on | cross-on | off | glassy | on | on | glassy | cross-on | |
High Tide | 4:07AM1.41m | 5:50PM1.32m | 4:30AM1.45m | 6:27PM1.30m | 4:57AM1.47m | 7:08PM1.26m | 5:26AM1.45m | 7:54PM1.22m | 5:59AM1.40m | 8:49PM1.17m | 6:37AM1.31m | 9:58PM1.14m | 7:24AM1.19m | ||||||||
Low Tide | 10:33PM0.72m | 11:01AM0.00m | 10:56PM0.78m | 11:32AM-0.05m | 11:19PM0.84m | 12:05PM-0.06m | 11:46PM0.88m | 12:43PM-0.02m | 00:17AM0.93m | 1:25PM0.06m | 00:58AM0.98m | 2:15PM0.17m | 2:06AM1.02m | 3:20PM0.30m | |||||||
 |  | |  | |  |  |  | | | | | |  | | | | | | | | |
 | — | 4:50 | — | — | 4:48 | — | — | 4:48 | — | — | 4:47 | — | — | 4:46 | — | — | 4:45 | — | — | 4:43 | — |
 | 6:27 | — | 6:28 | — | — | 6:28 | — | — | 6:29 | — | — | 6:30 | — | — | 6:30 | — | — | 6:31 | — | — | 6:32 |
— | — | — | — | — | — | 4 | 4 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 17 | 19 | 20 | 20 | 20 | 21 | 21 | 22 | 22 | 19 | 19 | 19 | 18 | 19 | 18 | 17 | 19 | 19 | 19 | 20 | 22 |
7 | 16 | 18 | 19 | 17 | 16 | 14 | 17 | 16 | 13 | 15 | 14 | 16 | 17 | 14 | 17 | 17 | 16 | 17 | 21 | 20 | |
Swell 1 Height (m) Direction Period (s) | SE 9 | SSW 11 | SSW 10 | SSW 8 | S 6 | ESE 10 | ESE 9 | ESE 10 | ESE 10 | SE 10 | SSW 9 | SSW 9 | S 7 | SE 11 | SE 11 | S 6 | SSE 6 | SSE 8 | SE 7 | SE 8 | SE 11 |
 kJ | 129 | 286 | 88 | 40 | 7 | 9 | 34 | 19 | 20 | 27 | 106 | 30 | 8 | 4 | 5 | 23 | 23 | 39 | 13 | 10 | 19 |
Swell 2 Height (m) Direction Period (s) | — | SE 8 | SE 8 | SSE 8 | SW 7 | E 4 | — | — | — | — | SE 10 | S 7 | SW 8 | SW 7 | SE 9 | SE 11 | SE 11 | ESE 11 | SE 11 | SE 11 | — |
| kJ | — | 10 | 16 | 6 | 2 | 2 | — | — | — | — | 26 | 15 | 3 | 2 | 3 | 4 | 4 | 11 | 18 | 18 | — |
Swell 3 Height (m) Direction Period (s) | — | SE 11 | — | SE 9 | SE 10 | SE 7 | — | — | — | — | — | — | SE 10 | WSW 7 | SW 7 | SE 8 | E 8 | — | — | — | — |
| kJ | — | 4 | — | 3 | 4 | 2 | — | — | — | — | — | — | 4 | 5 | 2 | 10 | 1 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 8 | — | — | — | — | SSW 4 | SSW 6 | SSW 8 | SSW 9 | SSW 8 | NNE 2 | — | S 4 | S 5 | S 5 | — | — | S 2 | SSW 4 | SSW 4 | SSW 5 |
| kJ | 675 | — | — | — | — | 18 | 229 | 1493 | 878 | 424 | 1 | — | 7 | 17 | 28 | — | — | 1 | 10 | 16 | 91 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 480 | 63 | 18 | 24 | 24 | 936 | 748 | 463 | 463 | 0 | 45 | 64 | 85 | 85 | 85 | 30 | 24 | 85 | 30 | 26 | 463 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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 16 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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