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Surf Forecasts:
Kugenuma Rivermouth surfForecast / Kanagawa / Japan
16 Day Weather and Surf, issued 8 am Sunday 31 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
20.6° C
(Which is 1.1°C colder than average for this time of year)Kugenuma Rivermouth surf forecast from 31 May 2026:
- Best quality surf: Wednesday 3 Jun, 3PM (local time) - 13ft (4.0m), 10s period, SSE swell with offshore winds.
- Most powerful swell: Wednesday 3 Jun, 9PM (local time) - 10ft (3.0m), 13s period, S swell with 3,637 kJ wave energy.
- Next surfable swell (1★+): Wednesday 3 Jun, 6AM (local time) - 2ft (0.6m), 12s period with SSW swell.
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 Wednesday (Jun 03) at 6AM. The primary swell is predicted to be 0.6m and 12s period with a secondary swell of 0.3m and 16s. Another secondary swell of 0.9m and 6s is also forecast. 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 3.0m 13s and forecast to arrive on Wednesday (Jun 03) at 9PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Thursday (Jun 04) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Wed 3rd Jun) | 2ft (0.6m) 12s |
| Best Surf | 3PM (Wed 3rd Jun) | 13ft (4.0m) 10s |
| Most Powerful | 9PM (Wed 3rd Jun) | 10ft (3.0m) 13s |
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 7mm), mostly falling on Tue night. Warm (max 26°C on Sun afternoon, min 19°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 161mm), heaviest during Wed afternoon. Warm (max 23°C on Thu morning, min 16°C on Fri night). Winds decreasing (near gales from the N on Wed night, light winds from the NE by Fri night). | ||||||||||||||||||||
Sunday 31 | Monday 1 | Tuesday 2 | Wednesday 3 | Thursday 4 | Friday 5 | Saturday 6 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
S 15 | S 13 | S 12 | S 11 | S 10 | SSW 13 | SSW 13 | SSW 13 | SW 12 | SE 7 | SSE 10 | SSW 13 | SSW 11 | SSW 10 | S 8 | S 8 | SSW 8 | SSW 7 | SSW 7 | S 3 | S 4 | |
39 | 81 | 98 | 86 | 156 | 238 | 285 | 257 | 152 | 529 | 2864 | 1099 | 176 | 107 | 68 | 32 | 19 | 10 | 9 | 5 | 10 | |
Wind (km/h) | |||||||||||||||||||||
off | cross-on | on | on | on | on | on | on | on | off | off | off | off | cross-off | off | off | cross-off | off | cross-off | cross-off | off | |
High Tide | 6:02PM1.32m | 3:57AM1.47m | 6:36PM1.32m | 4:31AM1.48m | 7:12PM1.31m | 5:09AM1.46m | 7:49PM1.30m | 5:51AM1.41m | 8:30PM1.29m | 6:40AM1.32m | 9:14PM1.28m | 7:38AM1.21m | 10:02PM1.27m | ||||||||
Low Tide | 10:48AM-0.03m | 10:38PM0.99m | 11:21AM-0.06m | 11:08PM1.00m | 11:56AM-0.05m | 11:44PM1.00m | 12:32PM-0.01m | 00:27AM0.99m | 1:12PM0.07m | 1:21AM0.97m | 1:56PM0.19m | 2:35AM0.94m | 2:45PM0.34m | ||||||||
 |  |  |  | |  | | |  |  | |  | | |  | | | | | | | |
 | 4:28 | — | — | 4:28 | — | — | 4:28 | — | — | 4:28 | — | — | 4:28 | — | — | 4:26 | — | — | 4:26 | — | — |
 | — | 6:50 | — | — | 6:51 | — | — | 6:51 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:53 | — |
— | — | — | — | — | — | — | — | 7 | 40 | 77 | 44 | — | — | — | — | — | — | — | — | — | |
Temp °C | 25 | 26 | 21 | 23 | 22 | 21 | 21 | 21 | 22 | 19 | 19 | 20 | 23 | 23 | 20 | 20 | 20 | 18 | 19 | 19 | 18 |
26 | 25 | 17 | 22 | 20 | 18 | 20 | 20 | 22 | 16 | 13 | 15 | 20 | 21 | 17 | 16 | 16 | 15 | 17 | 16 | 15 | |
Swell 1 Height (m) Direction Period (s) | S 6 | S 13 | S 12 | S 11 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SW 12 | SSE 7 | S 10 | SSW 13 | SSW 11 | SSW 10 | S 8 | S 8 | SSW 8 | SSW 7 | SSW 7 | SE 11 | S 8 |
 kJ | 6 | 81 | 98 | 86 | 105 | 238 | 285 | 257 | 152 | 158 | 1293 | 1099 | 176 | 107 | 68 | 32 | 19 | 10 | 9 | 5 | 1 |
Swell 2 Height (m) Direction Period (s) | S 15 | SE 12 | SE 12 | SSW 14 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SSW 12 | SW 16 | SSE 10 | SSE 9 | SSE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 7 | E 7 | SE 10 |
| kJ | 39 | 6 | 5 | 39 | 5 | 5 | 5 | 5 | 5 | 56 | 85 | 347 | 130 | 65 | 12 | 10 | 2 | 2 | 2 | 1 | 4 |
Swell 3 Height (m) Direction Period (s) | SE 12 | SE 12 | ESE 10 | SSW 17 | ESE 10 | E 9 | SE 11 | S 15 | S 14 | SW 15 | SSW 20 | S 11 | — | — | E 10 | S 12 | SE 12 | SE 12 | SE 11 | — | E 7 |
| kJ | 6 | 23 | 9 | 56 | 18 | 6 | 20 | 4 | 4 | 36 | 39 | 329 | — | — | 32 | 3 | 5 | 5 | 5 | — | 1 |
Wind waves Height (m) Direction Period (s) | — | S 6 | SSW 6 | S 5 | S 10 | SSW 3 | SSE 4 | S 4 | S 6 | SE 7 | SSE 10 | NNW 5 | NNE 3 | — | — | E 4 | — | — | — | S 3 | S 4 |
| kJ | — | 6 | 84 | 20 | 156 | 4 | 7 | 13 | 34 | 529 | 2864 | 75 | 3 | — | — | 3 | — | — | — | 5 | 10 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 26 | 19 | 2 | 85 | 19 | 64 | 85 | 7 | 813 | 545 | 130 | 49 | 130 | 463 | 140 | 484 | 484 | 1497 | 545 | 545 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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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