Surf Forecasts:
Kugenuma Rivermouth surf forecast from 6 Jul 2026:
- Best quality surf: Wednesday 8 Jul, 9AM (local time) - 5ft (1.6m), 17s period, SSE swell with cross-offshore winds.
- Most powerful swell: Saturday 11 Jul, 3AM (local time) - 7.5ft (2.3m), 17s period, SSW swell with 3,128 kJ wave energy.
- Next surfable swell (1★+): Monday 6 Jul, 9PM (local time) - 2ft (0.6m), 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 Monday (Jul 06) at 9PM. The primary swell is predicted to be 0.6m and 13s period with a secondary swell of 0.5m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Kugenuma Rivermouth in the next 16 days are 2.3m 17s and forecast to arrive on Saturday (Jul 11) at 3AM. 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+) | 9PM (Mon 6th Jul) | 2ft (0.6m) 13s |
| Best Surf | 9AM (Wed 8th Jul) | 5ft (1.6m) 17s |
| Most Powerful | 3AM (Sat 11th Jul) | 7.5ft (2.3m) 17s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Alright boys, Rusty here. Let’s break down what’s going on at Kugenuma Rivermouth. It’s a slow burn, so don't be in a rush.
This forecast is a bit of a rollercoaster. We’ve got a lot of flat, poor days, but a couple of moments that are worth setting the alarm for. The first real spark is on Wednesday, July 8th. Before that, Monday and Tuesday are a total washout with weak, short-period swell and lousy cross or onshore breezes. The water’s sitting at about 73°, which is pretty average for this time of year.
Now, Wednesday morning, July 8th, that’s the one. We’ve got a solid 5ft swell from the SSE with a very long period of 17 seconds. That’s a proper groundswell, and the combined energy is pumping at (1549). The wind is a light Easterly at 3 mph, so the surface will be clean. This is serious business for experienced surfers only – the size and power mean beginners should sit this one out. That long period will give you well-shaped waves at the rivermouth, with long waits between sets, making the paddle out a bit easier.
Wednesday afternoon stays big at 6ft, but the wind turns onshore, so the morning is your only shot at something special. After that, the wind goes bad, and the quality drops through the floor for a long stretch. From Thursday, July 9th all the way to Saturday, July 18th, it’s mostly onshore wind, dropping swell, and poor to marginal conditions. There’s a lot of chop in that window.
The next real highlight is Sunday morning, July 19th. It’s a smaller day, with 4ft swell from the SE at 12 seconds. The wind is a light offshore from the ENE at 6 mph, which is perfect for clean waves. The energy is moderate (428), and it looks clean. It’s not a beast, but it’s a great little window for a fun, clean session with a bit of shape. Good for all levels that day.
So, if you’re picking your battles, it’s Wednesday morning, July 8th for the power moves, and Sunday morning, July 19th for the cleaner, more manageable waves. Don't expect much from the long middle section.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Mon morning. Warm (max 27°C on Tue afternoon, min 22°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Thu morning, min 22°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | |||||||||||||||
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) | SE 7 | SE 7 | SSE 14 | SSE 15 | SSE 15 | SSE 16 | SSE 17 | SSE 16 | SSE 15 | S 15 | S 15 | S 16 | S 16 | S 16 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 14 | SSW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 89 | 79 | 138 | 201 | 372 | 328 | 1549 | 1393 | 1223 | 1263 | 1428 | 1526 | 2183 | 2323 | 2981 | 2574 | 2110 | 1512 | 859 | 452 | 195 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | off | cross | cross-off | cross-off | on | on | cross-on | on | on | cross-on | on | on | cross-on | on | on | on | on | on |
High Tide | 9:34PM1.38m | 10:05AM1.06m | 10:14PM1.37m | 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 | ||||||||
Low Tide | 2:46PM0.58m | 4:29AM0.66m | 3:25PM0.75m | 5:51AM0.57m | 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 | ||||||||
 | |  |  |  |  | | | | | | | | | | | | | | |  | |
 | 4:31 | — | — | 4:33 | — | — | 4:33 | — | — | 4:33 | — | — | 4:35 | — | — | 4:35 | — | — | 4:35 | — | — |
 | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — |
mm | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 23 | 22 | 26 | 27 | 23 | 24 | 25 | 24 | 25 | 25 | 24 | 25 | 24 | 23 | 23 | 24 | 23 | 24 | 25 | 24 |
Feels °C | 24 | 24 | 23 | 26 | 27 | 24 | 25 | 25 | 26 | 26 | 25 | 25 | 25 | 23 | 23 | 24 | 23 | 23 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SSE 7 | SE 7 | SSE 14 | SSE 15 | SSE 15 | SSE 14 | SSE 17 | SSE 16 | SSE 15 | S 15 | S 15 | S 16 | S 16 | S 16 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 14 | SSW 13 |
| kJ | 31 | 23 | 138 | 201 | 372 | 328 | 1549 | 1393 | 1223 | 1263 | 1428 | 1526 | 2183 | 2323 | 2981 | 2574 | 2110 | 1512 | 859 | 452 | 195 |
Swell 2 Height (m) Direction Period (s) | SE 15 | SE 14 | SE 7 | SE 12 | SSE 20 | SSE 16 | — | S 19 | ESE 8 | ESE 8 | ESE 8 | — | ESE 8 | SSW 18 | — | — | — | — | — | SE 11 | SSW 12 |
| kJ | 54 | 70 | 16 | 86 | 75 | 310 | — | 828 | 61 | 37 | 13 | — | 24 | 1490 | — | — | — | — | — | 29 | 14 |
Swell 3 Height (m) Direction Period (s) | SW 6 | SSE 16 | S 7 | SW 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | E 9 | SE 10 |
| kJ | 2 | 27 | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 | 4 |
Wind waves Height (m) Direction Period (s) | SE 7 | SE 7 | — | — | SE 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 4 | SSW 3 |
| kJ | 89 | 79 | — | — | 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 12 | 4 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 484 | 19 | 0 | 0 | 18 | 0 | 0 | 26 | 7 | 13 | 64 | 7 | 26 | 85 | 84 | 64 | 85 | 19 | 85 | 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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