Surf Forecasts:
Kugenuma Rivermouth surf forecast from 20 Oct 2026:
- Best quality surf: Tuesday 27 Oct, 12PM (local time) - 8ft (2.5m), 9s period, SW swell with offshore winds.
- Most powerful swell: Tuesday 27 Oct, 12PM (local time) - 8ft (2.5m), 9s period, SW swell with 951 kJ wave energy.
- Next surfable swell (1★+): Friday 23 Oct, 12AM (local time) - 3.5ft (1.1m), 15s 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 Friday (Oct 23) at 12AM. The primary swell is predicted to be 1.1m and 15s period with a secondary swell of 0.3m and 10s. 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 2.5m 9s and forecast to arrive on Tuesday (Oct 27) at 12PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 3s period and expected on Tuesday (Oct 27) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 23rd Oct) | 3.5ft (1.1m) 15s |
| Best Surf | 12PM (Tue 27th Oct) | 8ft (2.5m) 9s |
| Most Powerful | 12PM (Tue 27th Oct) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 16 days.
Short Range ForecastMostly dry. Warm (max 26°C on Wed morning, min 15°C on Thu night). Winds increasing (light winds from the SW on Tue night, strong winds from the SW by Wed afternoon). | Days 5-7 Weather SummaryHeavy rain (total 62mm), heaviest during Mon afternoon. Warm (max 22°C on Sun afternoon, min 14°C on Sat morning). Winds decreasing (fresh winds from the N on Sat afternoon, calm by Sun morning). | ||||||||||||||||||
Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | ||||||||||||||
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 13 | S 15 | SSW 6 | S 17 | SSE 13 | S 14 | S 15 | S 14 | S 14 | SSW 14 | SSW 13 | SSW 15 | SSW 14 | SSW 14 | SSW 12 | SSW 12 | SW 12 | SW 11 | SSE 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 189 | 210 | 329 | 297 | 356 | 515 | 510 | 460 | 447 | 346 | 192 | 334 | 268 | 161 | 81 | 81 | 34 | 30 | 20 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | off | cross-off | off | cross-off | cross | off | off | off | cross-off | off | glassy | cross | cross-off | cross-off | cross-on |
High Tide | 1:05AM1.15m | 2:46PM1.37m | 2:30AM1.25m | 3:06PM1.40m | 3:24AM1.34m | 3:24PM1.43m | 4:06AM1.41m | 3:41PM1.47m | 4:44AM1.46m | 3:59PM1.51m | 5:21AM1.47m | 4:20PM1.56m | |||||||
Low Tide | 7:53AM0.58m | 8:55PM0.78m | 8:43AM0.60m | 9:23PM0.62m | 9:23AM0.64m | 9:50PM0.47m | 9:54AM0.70m | 10:16PM0.34m | 10:20AM0.77m | 10:42PM0.23m | 10:43AM0.84m | 11:10PM0.15m | |||||||
 |  |  |  | | | | |  |  |  |  | | | |  | | |  | |
 | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — |
 | — | — | 5:00 | — | — | 4:59 | — | — | 4:58 | — | — | 4:57 | — | — | 4:55 | — | — | 4:53 | — |
mm | — | — | — | — | — | — | — | — | — | 2 | 12 | 9 | 3 | — | — | — | 14 | 22 | 2 |
Temp °C | 24 | 26 | 26 | 25 | 20 | 18 | 18 | 17 | 18 | 18 | 15 | 15 | 18 | 21 | 22 | 22 | 18 | 19 | 24 |
Feels °C | 26 | 22 | 22 | 21 | 15 | 14 | 15 | 14 | 16 | 17 | 11 | 10 | 17 | 22 | 23 | 23 | 17 | 20 | 20 |
Swell 1 Height (m) Direction Period (s) | SSE 13 | S 15 | S 14 | S 14 | SSE 13 | S 14 | S 15 | S 14 | S 14 | SSW 14 | SSW 13 | SSW 15 | SSW 14 | SSW 14 | SSW 12 | SSW 12 | SW 12 | SE 7 | SSE 7 |
| kJ | 189 | 210 | 184 | 249 | 356 | 515 | 510 | 460 | 447 | 346 | 192 | 334 | 268 | 161 | 81 | 81 | 34 | 12 | 20 |
Swell 2 Height (m) Direction Period (s) | S 17 | SSE 12 | S 18 | S 17 | S 15 | SSW 17 | SE 10 | SSW 16 | ESE 8 | SE 8 | SW 16 | SE 8 | SE 8 | SE 8 | SE 8 | SE 10 | SE 10 | SW 11 | SSW 10 |
| kJ | 93 | 79 | 159 | 297 | 283 | 216 | 15 | 237 | 103 | 34 | 119 | 65 | 69 | 29 | 15 | 15 | 15 | 30 | 10 |
Swell 3 Height (m) Direction Period (s) | — | — | SSE 11 | SSE 11 | SSW 6 | SE 10 | ESE 4 | SE 8 | — | — | SE 9 | — | — | — | SW 14 | — | — | ESE 10 | ESE 10 |
| kJ | — | — | 46 | 64 | 27 | 44 | 2 | 55 | — | — | 37 | — | — | — | 32 | — | — | 9 | 9 |
Wind waves Height (m) Direction Period (s) | S 6 | SSW 6 | SSW 6 | SSW 7 | — | ENE 3 | NE 3 | NE 3 | — | — | NNE 2 | NNE 3 | N 3 | — | — | — | ENE 2 | — | — |
| kJ | 41 | 156 | 329 | 188 | — | 4 | 2 | 2 | — | — | 1 | 3 | 2 | — | — | — | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 7 | 484 | 484 | 482 | 45 | 137 | 0 | 18 | 4 | 0 | 45 | 482 | 2 | 0 | 0 | 8 | 64 | 8 | 130 |
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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