Surf Forecasts:
Kugenuma Rivermouth surf forecast from 13 Jul 2026:
- Best quality surf: Monday 13 Jul, 9PM (local time) - 2.5ft (0.8m), 11s period, SSW swell with glassy winds.
- Most powerful swell: Monday 13 Jul, 9PM (local time) - 2.5ft (0.8m), 11s period, SSW swell with 145 kJ wave energy.
- Next surfable swell (1★+): Monday 13 Jul, 9PM (local time) - 2.5ft (0.8m), 11s 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 Monday (Jul 13) at 9PM. The primary swell is predicted to be 0.8m and 11s period with a secondary swell of 0.1m and 9s. 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 0.8m 11s and forecast to arrive on Monday (Jul 13) at 9PM. Winds are predicted to be glassy at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 13th Jul) | 2.5ft (0.8m) 11s |
| Best Surf | 9PM (Mon 13th Jul) | 2.5ft (0.8m) 11s |
| Most Powerful | 9PM (Mon 13th Jul) | 2.5ft (0.8m) 11s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 16 days.
Short Range ForecastMostly dry. Warm (max 29°C on Thu morning, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Fri morning. Warm (max 29°C on Thu afternoon, min 25°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Mon 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SSW 12 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | S 9 | SSW 5 | S 5 | S 4 | SE 10 | SSW 8 | SSE 4 | SE 12 | SE 10 | SE 9 | SSE 10 | SSE 9 | SE 8 | SSE 9 | SE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 206 | 109 | 91 | 59 | 38 | 34 | 106 | 35 | 22 | 25 | 15 | 6 | 8 | 23 | 35 | 29 | 60 | 29 | 17 | 33 | 19 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | on | on | on | on | cross-on | on | glassy | cross-on | glassy | cross-off | cross-on | cross-on | cross-off | cross-on | cross-off | cross-off | cross-off | cross-off | cross |
High Tide | 5:58PM1.39m | 3:24AM1.45m | 6:17PM1.41m | 4:10AM1.48m | 6:36PM1.42m | 4:54AM1.49m | 6:56PM1.43m | 5:38AM1.49m | 7:19PM1.44m | 6:24AM1.45m | 7:45PM1.45m | 7:12AM1.37m | 8:13PM1.45m | 8:06AM1.27m | |||||||
Low Tide | 10:36PM1.12m | 10:57AM0.05m | 11:07PM1.06m | 11:29AM0.05m | 11:37PM0.98m | 12:00PM0.09m | 00:11AM0.90m | 12:31PM0.16m | 00:49AM0.81m | 1:02PM0.26m | 1:31AM0.73m | 1:34PM0.39m | 2:21AM0.67m | ||||||||
 |  |  | | |  | |  | | |  |  | | | | | | | |  |  | |
 | — | — | 4:37 | — | — | 4:37 | — | — | 4:37 | — | — | 4:39 | — | — | 4:39 | — | — | 4:39 | — | — | 4:41 |
 | 6:58 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | 6:54 |
mm | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 1 | — | — | — | — | — | — | 3 | 1 |
Temp °C | 28 | 27 | 27 | 27 | 26 | 28 | 28 | 27 | 29 | 29 | 27 | 27 | 27 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 25 |
Feels °C | 32 | 31 | 28 | 28 | 27 | 30 | 29 | 28 | 33 | 33 | 31 | 32 | 29 | 29 | 31 | 31 | 29 | 30 | 31 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 9 | SE 10 | SE 9 | SSW 8 | SE 10 | SSW 8 | SSW 8 | SE 9 | SSE 4 | SE 10 | SE 9 | SSE 10 | SSE 9 | SE 8 | SSE 9 | SE 9 |
| kJ | 206 | 109 | 91 | 59 | 38 | 34 | 4 | 3 | 7 | 4 | 6 | 6 | 3 | 3 | 35 | 29 | 60 | 29 | 17 | 33 | 19 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 9 | SE 9 | SE 12 | SE 10 | SE 10 | SE 9 | E 11 | SE 9 | SE 8 | SE 10 | SE 10 | SSW 8 | SE 12 | SSE 4 | SSE 12 | S 9 | S 8 | SSE 10 | ESE 8 | S 9 |
| kJ | 4 | 3 | 3 | 6 | 4 | 4 | 3 | 2 | 3 | 3 | 4 | 4 | 6 | 23 | 2 | 13 | 6 | 5 | 10 | 22 | 13 |
Swell 3 Height (m) Direction Period (s) | SE 13 | SE 12 | SE 12 | S 15 | S 14 | S 14 | S 13 | S 13 | S 13 | — | SE 10 | E 10 | E 9 | SE 9 | SW 8 | S 10 | SW 7 | S 7 | SSE 10 | SE 9 | — |
| kJ | 6 | 6 | 6 | 4 | 4 | 4 | 4 | 3 | 3 | — | 15 | 2 | 2 | 3 | 2 | 2 | 2 | 1 | 10 | 28 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | S 3 | SSW 3 | S 3 | S 9 | SSW 5 | S 5 | S 4 | S 4 | SSE 4 | SSE 4 | — | — | S 4 | — | — | S 3 | SSW 3 | — |
| kJ | — | — | — | 1 | 3 | 2 | 106 | 35 | 22 | 25 | 12 | 3 | 8 | — | — | 3 | — | — | 5 | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 7 | 0 | 26 | 84 | 84 | 89 | 85 | 463 | 84 | 85 | 85 | 64 | 85 | 26 | 24 | 24 | 0 | 57 | 57 | 0 | 26 |
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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