Surf Forecasts:
Kugenuma Rivermouth surf forecast from 3 Jul 2026:
- Best quality surf: Tuesday 7 Jul, 6AM (local time) - 3ft (0.9m), 18s period, SSE swell with offshore winds.
- Most powerful swell: Friday 10 Jul, 6AM (local time) - 7ft (2.2m), 17s period, S swell with 2,860 kJ wave energy.
- Next surfable swell (1★+): Monday 6 Jul, 9AM (local time) - 1.5ft (0.4m), 14s period with SE 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 06) at 9AM. The primary swell is predicted to be 0.4m and 14s period with a secondary swell of 0.4m and 7s. 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 2.2m 17s and forecast to arrive on Friday (Jul 10) at 6AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Monday (Jul 06) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Mon 6th Jul) | 1.5ft (0.4m) 14s |
| Best Surf | 6AM (Tue 7th Jul) | 3ft (0.9m) 18s |
| Most Powerful | 6AM (Fri 10th Jul) | 7ft (2.2m) 17s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, listen up. We've got a bit of a slow start at Kugenuma Rivermouth here. The first few days are a write-off, with tiny, weak swells and poor conditions, so don't even bother paddling out until we get past that. The water temp is sitting at 23°, which is pretty much what you'd expect for this time of year, nothing weird going on there.
The real action kicks off around Tuesday the 7th. That morning, the wind is a clean offshore from the NNE, and the swell starts to show some real grunt. We’re looking at a 1.2m groundswell from the SE with a long 17-second period. The combined energy hits 854 (moderate energy), and the forecast is calling for very good surf. This is a standout session if you can get on it. The swell direction is a touch off the optimum, but that offshore wind and long period will carve out some nice lines at this river mouth.
Then Wednesday the 8th. This is the big one for the experienced crew. We’ve got a solid 1.9m swell from the SSE early, jumping to 2.0m in the afternoon. The period holds at 17 seconds, and combined energy is over 2000 (strong to very strong). The wind stays offshore or cross-off. This is big, powerful groundswell, so it's experts only. That size and power will be too much for beginners.
The swell hangs in there through Thursday the 9th, but by the afternoon the wind swings onshore, and the quality slides. For the rest of the second week, it’s a bit of a mixed bag. There's a drop-off in size after the 12th, and the wind is often wrong. The 16th and 17th of July look promising again, with clean conditions and moderate swells in the 0.9m to 1.4m range, but nothing that matches that standout window around the 7th to 9th. Overall, your best bet is to lock in Tuesday the 7th through Thursday the 9th.
Stay safe out there.
Rusty
Short Range ForecastHeavy rain (total 23mm), heaviest during Sun night. Warm (max 23°C on Fri morning, min 21°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Mon morning. Warm (max 27°C on Wed afternoon, min 21°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 3 | Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | |||||||||||||||
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) | S 7 | S 7 | S 6 | S 6 | S 15 | S 4 | SSE 4 | SSE 6 | SSE 6 | SE 14 | SE 13 | SE 13 | SE 17 | SSE 17 | SSE 16 | SSE 17 | SSE 16 | SSE 16 | S 15 | S 16 | S 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 21 | 23 | 6 | 6 | 4 | 9 | 7 | 41 | 36 | 53 | 45 | 102 | 854 | 1178 | 1433 | 2089 | 1968 | 1518 | 1611 | 1832 | 2178 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | on | cross-on | cross-on | on | glassy | cross-off | off | off | off | off | off | off | cross-off | cross-off | off | cross-off | cross-off | cross-off | on | on |
High Tide | 7:54PM1.40m | 6:47AM1.37m | 8:25PM1.40m | 7:41AM1.28m | 8:58PM1.39m | 8:44AM1.17m | 9:34PM1.38m | 10:05AM1.06m | 10:14PM1.37m | 12:11PM1.00m | 10:59PM1.35m | 3:26PM1.08m | 11:50PM1.34m | ||||||||
Low Tide | 12:57PM0.15m | 1:20AM0.86m | 1:32PM0.26m | 2:12AM0.79m | 2:08PM0.41m | 3:14AM0.73m | 2:46PM0.58m | 4:29AM0.66m | 3:25PM0.75m | 5:51AM0.57m | 4:12PM0.92m | 7:08AM0.45m | 5:54PM1.07m | ||||||||
 |  |  |  |  |  | | |  | | | |  | | | | |  | | | | |
 | 4:31 | — | — | 4:31 | — | — | 4:31 | — | — | 4:31 | — | — | 4:33 | — | — | 4:33 | — | — | 4:33 | — | — |
 | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — |
mm | 1 | — | — | — | 3 | 4 | 4 | 2 | 9 | 2 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 23 | 22 | 23 | 22 | 21 | 22 | 22 | 21 | 21 | 22 | 22 | 25 | 26 | 23 | 26 | 27 | 24 | 26 | 26 | 24 |
Feels °C | 24 | 24 | 23 | 24 | 22 | 23 | 24 | 24 | 24 | 21 | 21 | 21 | 24 | 24 | 24 | 25 | 26 | 26 | 28 | 28 | 26 |
Swell 1 Height (m) Direction Period (s) | S 7 | S 7 | S 6 | S 6 | SE 9 | S 4 | SE 10 | SSE 6 | SSE 6 | SE 7 | SE 13 | SSE 16 | SE 17 | SSE 17 | SSE 16 | SSE 17 | SSE 16 | SSE 16 | S 15 | S 16 | S 16 |
| kJ | 21 | 23 | 6 | 6 | 3 | 5 | 4 | 41 | 36 | 18 | 45 | 102 | 854 | 1178 | 1433 | 2089 | 1968 | 1518 | 1611 | 1832 | 2178 |
Swell 2 Height (m) Direction Period (s) | SW 8 | SE 8 | SW 7 | SE 9 | — | SE 10 | SW 6 | SE 10 | SE 15 | SE 14 | SE 8 | SE 13 | — | — | SSE 18 | — | — | S 21 | — | S 20 | SSW 16 |
| kJ | 10 | 3 | 2 | 3 | — | 4 | 1 | 4 | 9 | 53 | 14 | 82 | — | — | 1182 | — | — | 137 | — | 293 | 1452 |
Swell 3 Height (m) Direction Period (s) | SE 9 | E 12 | SE 9 | — | S 15 | E 8 | S 13 | SE 16 | S 8 | SE 9 | SSE 18 | SE 8 | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 3 | 3 | — | 4 | 1 | 4 | 10 | 1 | 3 | 30 | 16 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | S 2 | S 4 | SSE 4 | ENE 2 | NE 3 | NNE 3 | NE 3 | NE 2 | — | — | — | — | — | — | — | S 4 | — |
| kJ | — | — | — | — | 2 | 9 | 7 | 1 | 6 | 6 | 2 | 1 | — | — | — | — | — | — | — | 12 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 45 | 26 | 82 | 85 | 85 | 84 | 516 | 2 | 30 | 0 | 0 | 0 | 0 | 18 | 18 | 0 | 0 | 0 | 0 | 26 | 7 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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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