Surf Forecasts:
Kugenuma Rivermouth surf forecast from 16 Sep 2026:
- Best quality surf: Monday 21 Sep, 9AM (local time) - 4ft (1.2m), 11s period, SSE swell with glassy winds.
- Most powerful swell: Sunday 20 Sep, 9PM (local time) - 8ft (2.5m), 13s period, SSE swell with 2,178 kJ wave energy.
- Next surfable swell (1★+): Monday 21 Sep, 9AM (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 Monday (Sep 21) at 9AM. The primary swell is predicted to be 1.2m and 11s period with a secondary swell of 0.1m and 10s. 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 2.5m 13s and forecast to arrive on Sunday (Sep 20) 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 1.2m 4s period and expected on Sunday (Sep 20) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Mon 21st Sep) | 4ft (1.2m) 11s |
| Best Surf | 9AM (Mon 21st Sep) | 4ft (1.2m) 11s |
| Most Powerful | 9PM (Sun 20th Sep) | 8ft (2.5m) 13s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 16 days.
Short Range ForecastModerate rain (total 19mm), heaviest on Sat morning. Warm (max 23°C on Thu afternoon, min 18°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 16mm), heaviest on Sun afternoon. Warm (max 27°C on Mon morning, min 22°C on Sun afternoon). Winds decreasing (strong winds from the N on Sun afternoon, calm by Mon morning). | ||||||||||||||||||||
Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | |||||||||||||||
AM | PM | 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) | SSE 8 | SSE 8 | SSE 8 | S 12 | E 8 | SE 14 | SE 16 | SE 14 | SE 13 | SE 12 | SSE 12 | SSE 13 | SSE 11 | SE 10 | SE 9 | SE 8 | SE 8 | SE 7 | SSE 7 | SSE 9 | SE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 7 | 7 | 7 | 3 | 6 | 97 | 1164 | 1147 | 1249 | 1137 | 1197 | 1915 | 329 | 104 | 41 | 17 | 15 | 13 | 5 | 8 | 11 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | cross-off | off | off | off | off | off | cross-off | glassy | on | off | off | cross-off | off | off | cross-off | cross-off |
High Tide | 7:20PM1.53m | 9:56AM1.15m | 7:47PM1.45m | 8:14PM1.35m | 4:05PM1.31m | 9:47PM1.23m | 3:49PM1.37m | 1:05AM1.21m | 3:58PM1.41m | 2:32AM1.30m | 4:11PM1.43m | ||||||||||
Low Tide | 1:04PM0.96m | 2:44AM0.40m | 1:07PM1.07m | 4:02AM0.48m | 6:00AM0.52m | 8:47PM1.23m | 7:36AM0.48m | 9:09PM1.09m | 8:38AM0.44m | 9:33PM0.96m | 9:22AM0.42m | 9:55PM0.82m | |||||||||
 |  |  |  | | |  | |  |  |  | | | |  | | |  | | | | |
 | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — |
 | — | 5:46 | — | — | 5:45 | — | — | 5:44 | — | — | 5:43 | — | — | 5:40 | — | — | 5:39 | — | — | 5:38 | — |
mm | — | — | — | — | — | — | 10 | 7 | 2 | 1 | 14 | — | — | — | — | — | — | 1 | — | — | 4 |
Temp °C | 20 | 23 | 20 | 22 | 22 | 21 | 21 | 21 | 22 | 24 | 23 | 24 | 27 | 27 | 26 | 25 | 26 | 23 | 25 | 27 | 24 |
Feels °C | 16 | 18 | 16 | 16 | 17 | 16 | 17 | 19 | 20 | 20 | 18 | 21 | 28 | 28 | 30 | 25 | 27 | 23 | 25 | 29 | 25 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SSE 8 | SE 8 | SE 8 | SE 14 | SE 16 | SE 14 | SE 13 | SE 12 | SSE 12 | SSE 13 | SSE 11 | SE 10 | SE 9 | SE 8 | SE 8 | SE 7 | SSE 7 | SSE 9 | SE 8 |
| kJ | 7 | 7 | 7 | 3 | 3 | 97 | 1164 | 1147 | 1249 | 1137 | 1197 | 1915 | 329 | 104 | 41 | 17 | 15 | 13 | 5 | 8 | 11 |
Swell 2 Height (m) Direction Period (s) | SE 7 | SE 7 | E 8 | S 12 | SE 12 | SE 10 | — | — | — | — | — | N 5 | SW 10 | S 10 | — | S 9 | S 9 | SE 9 | S 8 | S 8 | S 8 |
| kJ | 2 | 2 | 6 | 3 | 5 | 15 | — | — | — | — | — | 16 | 4 | 2 | — | 2 | 1 | 3 | 1 | 1 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | SE 9 | SE 9 | E 8 | — | — | — | — | — | — | — | WSW 7 | S 10 | S 9 | SSW 9 | — | S 8 | SE 9 | SSW 8 | SSW 8 |
| kJ | — | — | 3 | 3 | 6 | — | — | — | — | — | — | — | 5 | 2 | 2 | 8 | — | 1 | 3 | 7 | 6 |
Wind waves Height (m) Direction Period (s) | NNE 3 | NE 3 | NE 4 | N 4 | NNE 4 | NNE 4 | NNE 4 | N 4 | N 3 | N 4 | N 4 | N 4 | — | — | — | NNE 2 | — | — | — | ESE 4 | — |
| kJ | 4 | 9 | 14 | 18 | 15 | 15 | 19 | 14 | 5 | 23 | 42 | 15 | — | — | — | 1 | — | — | — | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 140 | 140 | 480 | 463 | 222 | 222 | 222 | 503 | 482 | 130 | 503 | 2 | 0 | 49 | 30 | 140 | 137 | 222 | 252 | 2695 | 837 |
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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