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Surf Forecasts:
Kugenuma Rivermouth surfForecast / Kanagawa / Japan
16 Day Weather and Surf, issued 2 pm Saturday 09 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
20.4° C
(Which is slightly warmer than usual)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 Thursday (May 14) at 6AM. The primary swell is predicted to be 0.5m and 10s period with a secondary swell of 0.4m and 10s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Kugenuma Rivermouth in the next 16 days are 0.8m 8s and forecast to arrive on Tuesday (May 12) at 12AM. 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 10) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 14th May) | 1.5ft (0.5m) 10s |
| Best Surf | 6AM (Thu 14th May) | 1.5ft (0.5m) 10s |
| Most Powerful | 12AM (Tue 12th May) | 2.5ft (0.8m) 8s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Very mild (max 19°C on Sat afternoon, min 16°C on Sat night). Mainly fresh winds. | Days 5-7 Weather SummaryModerate rain (total 12mm), heaviest on Thu night. Warm (max 23°C on Wed afternoon, min 15°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sat 9 | Sunday 10 | Monday 11 | Tuesday 12 | Wednesday 13 | Thursday 14 | Friday 15 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
SE 11 | SE 11 | SE 10 | SSE 5 | SSE 6 | S 6 | S 4 | SSE 8 | SSE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 10 | SE 10 | SE 9 | SE 10 | SSE 8 | SSE 7 | S 7 | SE 11 | |
18 | 18 | 16 | 19 | 41 | 31 | 18 | 78 | 48 | 37 | 52 | 39 | 30 | 45 | 48 | 23 | 36 | 11 | 10 | 5 | 5 | |
Wind (km/h) | |||||||||||||||||||||
on | cross-off | off | cross-on | on | on | on | on | on | cross-on | on | cross-off | cross-off | off | cross-off | on | glassy | cross | on | on | on | |
High Tide | 00:37AM1.17m | 11:09AM0.96m | 1:23AM1.20m | 1:22PM1.01m | 1:56AM1.24m | 2:41PM1.10m | 2:23AM1.27m | 3:36PM1.19m | 2:47AM1.31m | 4:20PM1.26m | 3:10AM1.35m | 5:00PM1.29m | 3:32AM1.40m | ||||||||
Low Tide | 4:48PM0.43m | 7:08AM0.84m | 6:19PM0.51m | 7:58AM0.67m | 7:30PM0.57m | 8:36AM0.50m | 8:23PM0.63m | 9:09AM0.35m | 9:05PM0.69m | 9:39AM0.21m | 9:39PM0.76m | 10:09AM0.09m | 10:07PM0.82m | 10:38AM0.01m | |||||||
 |  |  | | | | | | | |  | | | | | |  | | | | | |
 | — | — | 4:41 | — | — | 4:41 | — | — | 4:41 | — | — | 4:39 | — | — | 4:39 | — | — | 4:37 | — | — | 4:37 |
 | 6:32 | — | — | 6:34 | — | — | 6:35 | — | — | 6:36 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | 6:38 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 12 | — | — | — | — | |
Temp °C | 19 | 18 | 19 | 18 | 18 | 19 | 19 | 18 | 18 | 18 | 18 | 21 | 23 | 19 | 20 | 19 | 17 | 18 | 19 | 18 | 20 |
14 | 16 | 16 | 14 | 15 | 14 | 13 | 14 | 16 | 14 | 16 | 18 | 19 | 16 | 19 | 15 | 17 | 17 | 17 | 17 | 17 | |
Swell 1 Height (m) Direction Period (s) | SE 11 | S 3 | SE 10 | SE 9 | SE 9 | SE 11 | ESE 11 | SSE 8 | SSE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 10 | SE 10 | SE 9 | SE 10 | SSE 8 | SSE 7 | SE 11 | SE 11 |
 kJ | 18 | 2 | 16 | 14 | 3 | 4 | 11 | 78 | 48 | 37 | 52 | 39 | 30 | 45 | 48 | 23 | 36 | 11 | 10 | 5 | 5 |
Swell 2 Height (m) Direction Period (s) | SSE 7 | SE 11 | S 3 | — | SE 11 | SE 8 | — | ESE 10 | — | SE 11 | — | — | — | SE 11 | E 9 | SSE 10 | SSE 9 | SE 12 | SE 11 | S 7 | SE 8 |
| kJ | 5 | 18 | 1 | — | 5 | 3 | — | 39 | — | 18 | — | — | — | 5 | 15 | 10 | 15 | 5 | 5 | 4 | 2 |
Swell 3 Height (m) Direction Period (s) | S 7 | S 6 | S 6 | — | — | — | — | — | — | — | — | — | — | — | — | ESE 11 | SE 9 | E 10 | S 7 | S 7 | S 6 |
| kJ | 8 | 3 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 12 | 3 | 2 | 4 | 1 | 1 |
Wind waves Height (m) Direction Period (s) | SSW 6 | ESE 2 | NE 2 | SSE 5 | SSE 6 | S 6 | S 4 | SSE 8 | — | S 3 | — | — | — | — | — | S 3 | — | — | S 2 | — | — |
| kJ | 14 | 1 | 1 | 19 | 41 | 31 | 18 | 54 | — | 1 | — | — | — | — | — | 2 | — | — | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 24 | 30 | 57 | 463 | 85 | 85 | 85 | 19 | 26 | 64 | 24 | 45 | 45 | 8 | 0 | 49 | 2 | 57 | 64 | 26 | 84 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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 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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