Surf Forecasts:
Kugenuma Rivermouth surf forecast from 21 Sep 2026:
- Best quality surf: Tuesday 22 Sep, 3AM (local time) - 4ft (1.2m), 11s period, SSE swell with glassy winds.
- Most powerful swell: Tuesday 22 Sep, 3AM (local time) - 4ft (1.2m), 11s period, SSE swell with 337 kJ wave energy.
- Next surfable swell (1★+): Tuesday 22 Sep, 3AM (local time) - 4ft (1.2m), 11s period with SSE 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 Tuesday (Sep 22) at 3AM. The primary swell is predicted to be 1.2m and 11s period with a secondary swell of 0.1m and 8s. 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 1.2m 11s and forecast to arrive on Tuesday (Sep 22) at 3AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Wednesday (Sep 23) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Tue 22nd Sep) | 4ft (1.2m) 11s |
| Best Surf | 3AM (Tue 22nd Sep) | 4ft (1.2m) 11s |
| Most Powerful | 3AM (Tue 22nd Sep) | 4ft (1.2m) 11s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 16 days.
Short Range ForecastModerate rain (total 16mm), heaviest on Mon night. Warm (max 27°C on Mon night, min 20°C on Wed night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 49mm), heaviest during Sun morning. Warm (max 25°C on Fri afternoon, min 18°C on Sun morning). Wind will be generally light. | ||||||||||||||||||
Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | Sunday 27 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | S 12 | SSE 9 | SSE 9 | SSE 8 | SSE 7 | SSE 7 | SSE 6 | SE 6 | SE 6 | SE 8 | SE 8 | SE 8 | SE 8 | S 10 | SE 10 | ESE 8 | S 9 | S 8 | SSW 11 |
Wave Graph  | |||||||||||||||||||
 kJ | 1248 | 181 | 123 | 62 | 36 | 25 | 15 | 8 | 5 | 3 | 3 | 3 | 3 | 2 | 4 | 6 | 6 | 7 | 11 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off |
High Tide | 1:05AM1.21m | 3:58PM1.41m | 2:32AM1.30m | 4:11PM1.43m | 3:26AM1.39m | 4:24PM1.45m | 4:07AM1.47m | 4:37PM1.48m | 4:44AM1.52m | 4:51PM1.51m | 5:20AM1.54m | 5:08PM1.55m | |||||||
Low Tide | 9:09PM1.09m | 8:38AM0.44m | 9:33PM0.96m | 9:22AM0.42m | 9:55PM0.82m | 9:58AM0.44m | 10:18PM0.68m | 10:27AM0.48m | 10:41PM0.55m | 10:52AM0.54m | 11:05PM0.43m | 11:14AM0.61m | 11:31PM0.32m | ||||||
 |  |  |  | |  | |  |  | | | | | | |  |  |  | | |
 | — | 5:28 | — | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — |
 | — | — | 5:39 | — | — | 5:38 | — | — | 5:37 | — | — | 5:36 | — | — | 5:34 | — | — | 5:32 | — |
mm | 4 | 1 | — | 4 | — | 2 | 5 | — | — | 2 | — | — | 2 | — | 3 | 9 | 27 | 6 | 6 |
Temp °C | 27 | 27 | 27 | 25 | 22 | 22 | 21 | 25 | 26 | 24 | 23 | 25 | 23 | 22 | 20 | 19 | 18 | 19 | 19 |
Feels °C | 25 | 25 | 28 | 27 | 20 | 22 | 21 | 26 | 28 | 26 | 22 | 24 | 23 | 22 | 20 | 19 | 16 | 18 | 20 |
Swell 1 Height (m) Direction Period (s) | S 12 | SSE 9 | SSE 9 | SSE 8 | SSE 7 | SSE 7 | SSE 6 | SE 6 | SE 6 | SE 5 | SE 8 | SE 8 | SE 8 | S 8 | SE 10 | ESE 8 | S 9 | ESE 7 | SE 7 |
| kJ | 1248 | 181 | 123 | 62 | 36 | 25 | 15 | 8 | 5 | 1 | 3 | 3 | 3 | 1 | 4 | 6 | 6 | 5 | 8 |
Swell 2 Height (m) Direction Period (s) | NNW 5 | SW 8 | E 10 | SE 5 | S 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 8 | S 7 | — | SE 5 | SE 4 | SE 4 | SE 9 | SE 9 | S 8 | S 8 |
| kJ | 14 | 3 | 2 | 25 | 2 | 3 | 3 | 3 | 3 | 3 | 1 | — | 1 | 1 | 1 | 3 | 3 | 6 | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | E 10 | SSW 8 | S 8 | S 8 | S 8 | S 7 | SE 5 | S 7 | S 7 | S 10 | E 8 | S 9 | SE 4 | SSE 8 | SSW 11 |
| kJ | — | — | — | — | 2 | 7 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 2 | 1 | 7 | 11 |
Wind waves Height (m) Direction Period (s) | NW 5 | — | — | — | NE 3 | NNE 3 | — | NNE 2 | — | — | ENE 3 | — | — | — | — | — | — | — | — |
| kJ | 18 | — | — | — | 2 | 2 | — | 1 | — | — | 1 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 4 | 45 | 0 | 45 | 252 | 252 | 85 | 61 | 69 | 252 | 887 | 2486 | 140 | 795 | 482 | 63 | 222 | 63 | 24 |
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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