Surf Forecasts:
Kugenuma Rivermouth surf forecast from 17 Jun 2026:
- Best quality surf: Thursday 18 Jun, 3PM (local time) - 2.5ft (0.8m), 7s period, S swell with offshore winds.
- Most powerful swell: Thursday 18 Jun, 6PM (local time) - 3ft (0.9m), 7s period, S swell with 83 kJ wave energy.
- Next surfable swell (1★+): Thursday 18 Jun, 3PM (local time) - 2.5ft (0.8m), 7s period with S 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 Thursday (Jun 18) at 3PM. The primary swell is predicted to be 0.8m and 7s period with a secondary swell of 0.2m and 9s. 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 0.9m 7s and forecast to arrive on Thursday (Jun 18) at 6PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Tuesday (Jun 23) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Thu 18th Jun) | 2.5ft (0.8m) 7s |
| Best Surf | 3PM (Thu 18th Jun) | 2.5ft (0.8m) 7s |
| Most Powerful | 6PM (Thu 18th Jun) | 3ft (0.9m) 7s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 28mm), heaviest during Sat afternoon. Warm (max 26°C on Thu afternoon, min 19°C on Wed night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 22mm), heaviest during Sat night. Warm (max 21°C on Sat night, min 18°C on Tue afternoon). Winds increasing (light winds from the NNE on Mon night, fresh winds from the N by Tue afternoon). | ||||||||||||||||||||
Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wed 24 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SSE 4 | S 7 | S 7 | S 7 | S 7 | S 6 | SSW 7 | SSW 7 | ESE 5 | SE 5 | SE 6 | SE 7 | SE 8 | SE 8 | SE 7 | SE 7 | SSW 8 | SSW 7 | SSE 11 | SSE 11 | SSE 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 51 | 62 | 48 | 31 | 12 | 10 | 18 | 15 | 23 | 28 | 27 | 16 | 16 | 19 | 19 | 13 | 15 | 11 | 11 | 11 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | off | off | cross-off | cross | on | cross-off | off | off | cross-off | off | off | off | off | off | off | cross-off | off | cross-off | cross-off | off |
High Tide | 5:31AM1.45m | 7:56PM1.35m | 6:19AM1.38m | 8:31PM1.34m | 7:12AM1.29m | 9:09PM1.34m | 8:14AM1.18m | 9:50PM1.33m | 9:33AM1.07m | 10:33PM1.32m | 11:22AM1.00m | 11:19PM1.32m | 1:45PM1.03m | ||||||||
Low Tide | 00:10AM0.99m | 12:46PM0.06m | 00:58AM0.95m | 1:24PM0.16m | 1:54AM0.90m | 2:05PM0.29m | 3:03AM0.84m | 2:49PM0.45m | 4:24AM0.76m | 3:39PM0.62m | 5:48AM0.65m | 4:41PM0.78m | 7:00AM0.51m | ||||||||
 |  |  |  | |  |  |  |  |  | | |  |  | | | | | | | | |
 | — | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:28 | — |
 | 6:58 | — | 6:59 | — | — | 6:59 | — | — | 6:59 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 |
mm | 12 | 1 | — | 1 | — | — | — | 3 | 11 | 9 | 2 | 2 | — | — | 2 | 6 | — | 1 | 1 | — | — |
Temp °C | 21 | 23 | 26 | 22 | 24 | 24 | 22 | 20 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 21 | 20 | 18 | 18 | 20 |
Feels °C | 22 | 20 | 24 | 24 | 25 | 25 | 24 | 20 | 23 | 21 | 20 | 17 | 18 | 19 | 19 | 22 | 19 | 16 | 13 | 13 | 17 |
Swell 1 Height (m) Direction Period (s) | SSE 4 | S 7 | S 7 | S 7 | S 7 | S 6 | SSE 6 | SSW 7 | S 6 | SSE 5 | SE 6 | SE 7 | SE 8 | SE 8 | SE 7 | SE 7 | SSW 8 | SSW 7 | SSE 11 | SSE 11 | SSE 11 |
| kJ | 6 | 51 | 62 | 48 | 31 | 12 | 6 | 18 | 7 | 9 | 28 | 27 | 16 | 16 | 19 | 19 | 13 | 15 | 11 | 11 | 11 |
Swell 2 Height (m) Direction Period (s) | SW 8 | SE 10 | SSE 9 | SSW 8 | SSE 10 | SSE 10 | SSW 7 | SSE 10 | SSE 10 | SSE 9 | SW 7 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSE 10 | ESE 8 | SSE 11 | S 6 | S 6 | S 6 |
| kJ | 3 | 4 | 8 | 28 | 10 | 10 | 10 | 9 | 9 | 8 | 14 | 11 | 9 | 10 | 4 | 10 | 6 | 13 | 3 | 1 | 1 |
Swell 3 Height (m) Direction Period (s) | SE 10 | S 16 | S 16 | SSE 9 | S 15 | SE 14 | SSE 10 | SE 13 | SE 12 | SW 7 | SSE 9 | SSE 9 | SSE 10 | SSE 10 | SSE 10 | S 6 | SSE 11 | ESE 8 | SW 8 | S 8 | S 6 |
| kJ | 4 | 5 | 5 | 16 | 4 | 7 | 10 | 7 | 6 | 2 | 8 | 8 | 10 | 10 | 10 | 3 | 13 | 6 | 2 | 1 | 1 |
Wind waves Height (m) Direction Period (s) | — | NNE 2 | N 3 | — | — | SSE 3 | — | — | ESE 5 | SE 5 | NE 3 | NE 3 | ENE 2 | — | — | — | — | NNE 3 | NNE 3 | NNE 3 | — |
| kJ | — | 2 | 5 | — | — | 1 | — | — | 15 | 23 | 2 | 3 | 1 | — | — | — | — | 1 | 7 | 4 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 57 | 82 | 0 | 0 | 24 | 64 | 57 | 252 | 24 | 105 | 140 | 140 | 30 | 30 | 30 | 24 | 30 | 61 | 88 | 88 | 69 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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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