Surf Forecasts:
Kugenuma Rivermouth surf forecast from 8 Jul 2026:
- Best quality surf: Thursday 9 Jul, 6AM (local time) - 4ft (1.2m), 13s period, SSE swell with glassy winds.
- Most powerful swell: Saturday 11 Jul, 9AM (local time) - 7ft (2.2m), 17s period, SSW swell with 2,842 kJ wave energy.
- Next surfable swell (1★+): Thursday 9 Jul, 6AM (local time) - 4ft (1.2m), 13s 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 Thursday (Jul 09) at 6AM. The primary swell is predicted to be 1.2m and 13s period with a secondary swell of 0.9m and 15s. 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 2.2m 17s and forecast to arrive on Saturday (Jul 11) at 9AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 9th Jul) | 4ft (1.2m) 13s |
| Best Surf | 6AM (Thu 9th Jul) | 4ft (1.2m) 13s |
| Most Powerful | 9AM (Sat 11th Jul) | 7ft (2.2m) 17s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 16 days.
All right, let’s talk in feet and Fahrenheit. This is for the Kugenuma Rivermouth.
The story’s the same: a slow start, but a real gem on the 8th. Wednesday morning, we’ve got chest-high surf at about 5ft from the SSE, with a 16-second interval – that’s proper groundswell. The wind is a light cross-offshore from the east at 6 mph, leaving the water glassy. The combined swell energy sits at 1094, a moderate reading. That’s the best session in the whole forecast. Water temp is 75°, bang on average for mid-summer.
Wednesday afternoon, the wind goes onshore from the south, swell bumps to 5ft, but the quality tanks. Marginal at best.
Thursday through the weekend is a write-off. South wind blowing onshore, moderate to fresh. Swells are 5ft to 7ft-plus on Friday and Saturday with long periods (14-17 seconds), but that southerly wind just destroys the surface. The energy gets strong (1632 to 2842), but it’s lumpy and poor. Saturday morning has 7ft of SSW groundswell with a 17-second period, but with 20 mph onshore wind, it’s a washing machine – only for the hardcore, and it won’t be fun.
The middle of the outlook goes flat. Swells drop below 3ft, energy falls to weak, and the wind stays trash. A proper dead spell.
On Wednesday the 22nd, the wind finally shifts offshore from the northeast at 9 mph, and we get 4ft of south swell with a 14-second period. The energy is moderate (600), and it looks clean. That’s a promising sign, but it’s deep in the second week, so keep your fingers crossed. Thursday the 23rd holds similar at 4ft with clean, offshore wind.
So, the absolute standout is Wednesday morning, July 8th. Go get it. After that, it’s a long stretch of flat or junk until that late window around the 22nd.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Wed morning, min 23°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sun night. Warm (max 26°C on Mon morning, min 23°C on Sat night). Winds decreasing (fresh winds from the S on Sat afternoon, light winds from the S by Mon morning). | ||||||||||||||||||||
Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | |||||||||||||||
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 16 | SSE 16 | SSE 14 | S 14 | SSE 14 | S 15 | S 15 | S 16 | SSW 16 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 13 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SE 11 | SSE 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1094 | 1055 | 980 | 912 | 788 | 945 | 1610 | 2141 | 2455 | 2842 | 2189 | 1654 | 1169 | 674 | 336 | 213 | 125 | 70 | 65 | 42 | 465 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | on | on | on | on | on | on | on | on | on | cross-on | on | on | on | on | on | on | on | on | on | on |
High Tide | 12:11PM1.00m | 10:59PM1.35m | 3:26PM1.08m | 11:50PM1.34m | 4:34PM1.21m | 00:46AM1.35m | 5:09PM1.30m | 1:43AM1.37m | 5:36PM1.36m | 2:36AM1.41m | 5:58PM1.39m | 3:24AM1.45m | 6:17PM1.41m | ||||||||
Low Tide | 4:12PM0.92m | 7:08AM0.45m | 5:54PM1.07m | 8:11AM0.33m | 7:54PM1.15m | 9:03AM0.22m | 9:11PM1.17m | 9:46AM0.13m | 10:00PM1.16m | 10:23AM0.07m | 10:36PM1.12m | 10:57AM0.05m | 11:07PM1.06m | ||||||||
 | |  | | | | | | | |  |  | |  |  | | |  | | | | |
 | 4:33 | — | — | 4:33 | — | — | 4:35 | — | — | 4:35 | — | — | 4:35 | — | — | 4:35 | — | — | 4:37 | — | — |
 | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — | — | — | — | — | — |
Temp °C | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 26 | 26 | 24 | 26 | 25 | 24 |
Feels °C | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 24 | 24 | 25 | 24 | 24 | 25 | 25 | 27 | 27 | 25 | 24 | 27 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | SSE 16 | SSE 16 | SSE 14 | S 14 | SSE 14 | S 15 | S 15 | S 16 | SSW 16 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 13 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 10 | SSE 14 |
| kJ | 1094 | 1055 | 980 | 912 | 788 | 945 | 1610 | 2141 | 2455 | 2842 | 2189 | 1654 | 1169 | 674 | 336 | 213 | 125 | 70 | 65 | 41 | 465 |
Swell 2 Height (m) Direction Period (s) | — | S 18 | ESE 8 | ESE 8 | S 18 | SSW 19 | ESE 8 | — | SE 10 | — | — | — | SE 14 | SSE 10 | SSE 9 | SW 15 | SE 9 | SE 9 | SE 12 | SE 11 | SSW 10 |
| kJ | — | 422 | 21 | 25 | 300 | 283 | 22 | — | 96 | — | — | — | 7 | 9 | 9 | 34 | 14 | 13 | 51 | 42 | 39 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | ESE 9 | SE 13 | SE 10 | SE 13 | SE 13 | SSE 15 | SSE 14 | SSE 17 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 15 | 7 | 4 | 6 | 6 | 22 | 36 | 329 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | S 4 | — | — | S 4 | SSW 4 | — | S 3 | S 4 | S 3 | S 3 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 13 | — | — | 12 | 11 | — | 3 | 7 | 2 | 3 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 26 | 7 | 26 | 64 | 7 | 26 | 85 | 7 | 85 | 85 | 85 | 7 | 85 | 7 | 4 | 85 | 7 | 84 | 85 | 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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