Surf Forecasts:
Kugenuma Rivermouth surf forecast from 16 Jul 2026:
- Most powerful swell: Wednesday 22 Jul, 6AM (local time) - 0.5ft (0.2m), 13s period, SSE swell with 17 kJ wave energy.
Best Forecast Surf Conditions for Kugenuma Rivermouth this week:
The most powerful waves expected at Kugenuma Rivermouth in the next 16 days are 0.2m 13s and forecast to arrive on Wednesday (Jul 22) at 6AM. Winds are predicted to be offshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 6AM (Wed 22nd Jul) | 0.5ft (0.2m) 13s |
Table - best surf conditions forecast for Kugenuma Rivermouth over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s be straight with you: this outlook for Kugenuma Rivermouth is a tough one. We’re looking at a long stretch of tiny, weak, and mostly messy surf, so don’t get your hopes up for anything pumping for a while.
The whole forecast period is dominated by onshore winds and very low-energy swells. For the first week and a half, it’s all small, short-period junk. The water temp is sitting at 77.2°F which is about average for this time of year, so that’s one nice thing at least. But the wave energy is barely registering, with combined swell energy values mostly under 30 – that’s the sound of a lake, not an ocean. We’re talking about a solid 11-day gap of almost nothing rideable here at Kugenuma, from Thursday 16 July to Saturday 25 July. It’s poor, it’s small, and the wind is almost always on it.
The first real glimmer of hope shows up on Monday morning, 27 July. You’ll see a bit of a bump – 2.6ft from the SSE with a period of 10 seconds. The combined energy finally reaches a moderate 155, and we get a clean, cross-off wind. It’s surfable, but only just. It’s what I’d call a very ordinary session, not a standout.
The best on offer, and the only true standout in this whole 16-day run, is Tuesday morning, 28 July. This is the one to circle. We get a 3ft swell from the South at 11 seconds, which is a legitimate groundswell. But the real kicker is the wind: it’s glassy, dead calm. That means the Rivermouth will be clean as a whistle. The combined energy hits a moderate 219, the best of the whole forecast. It’s a small, clean morning session. Don’t expect barrels, expect fun, tidy little waves. The afternoon goes to shit with a moderate onshore, so be there at dawn.
After that, Wednesday 29 July has some size (3.9ft on Wednesday afternoon) but the wind is straight onshore and strong at 15.5 mph, so it will be a messy, blown-out mess. That’s one for the kite surfers, not the paddle crew.
So there you have it. It’s a grim lead-in, but that Tuesday 28th morning is your window. Get on it.
Short Range ForecastLight rain (total 5mm), mostly falling on Fri morning. Warm (max 30°C on Thu afternoon, min 25°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Tue night. Warm (max 30°C on Wed morning, min 25°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Thu 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | ||||||||||||||
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 5 | SSW 8 | SSW 8 | SSW 8 | SSE 9 | SE 9 | SE 8 | SE 8 | SE 8 | S 3 | SSE 8 | SSE 9 | ESE 11 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 13 | SSE 12 | SSE 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 11 | 6 | 6 | 6 | 8 | 12 | 11 | 10 | 9 | 11 | 6 | 7 | 12 | 7 | 7 | 6 | 6 | 16 | 14 | 12 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | cross-on | on | on | cross-on | on | glassy | cross-off | cross | cross-off |
High Tide | 6:56PM1.43m | 5:38AM1.49m | 7:19PM1.44m | 6:24AM1.45m | 7:45PM1.45m | 7:12AM1.37m | 8:13PM1.45m | 8:06AM1.27m | 8:44PM1.45m | 9:09AM1.15m | 9:18PM1.42m | 10:39AM1.04m | 9:55PM1.40m | |||||||
Low Tide | 00:11AM0.90m | 12:31PM0.16m | 00:49AM0.81m | 1:02PM0.26m | 1:31AM0.73m | 1:34PM0.39m | 2:21AM0.67m | 2:05PM0.55m | 3:19AM0.62m | 2:35PM0.72m | 4:33AM0.58m | 2:58PM0.89m | ||||||||
 |  |  |  |  | | | | | |  | | | | | |  | | | | |
 | — | — | 4:39 | — | — | 4:39 | — | — | 4:39 | — | — | 4:41 | — | — | 4:41 | — | — | 4:41 | — | — |
 | 6:57 | — | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — |
mm | — | 1 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — |
Temp °C | 30 | 27 | 27 | 27 | 26 | 27 | 26 | 25 | 27 | 27 | 26 | 28 | 28 | 27 | 29 | 29 | 27 | 30 | 31 | 27 |
Feels °C | 33 | 31 | 29 | 29 | 28 | 29 | 27 | 27 | 28 | 29 | 28 | 30 | 30 | 32 | 32 | 32 | 31 | 31 | 34 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SE 12 | SSE 8 | SSE 9 | SSE 8 | SSE 8 | SSW 3 | SSE 8 | SSE 8 | SSE 13 | SSE 12 | SSE 11 |
| kJ | 7 | 6 | 6 | 6 | 8 | 12 | 11 | 10 | 9 | 6 | 6 | 7 | 7 | 7 | 1 | 6 | 6 | 16 | 14 | 12 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 9 | SSW 8 | SW 7 | S 9 | S 8 | S 8 | — | S 8 | S 7 | SE 11 | S 7 | SSE 8 | E 11 | S 14 | S 3 | SE 7 | SW 5 |
| kJ | 4 | 4 | 4 | 3 | 6 | 2 | 2 | 5 | 5 | — | 5 | 4 | 5 | 1 | 7 | 2 | 4 | 1 | 2 | 1 |
Swell 3 Height (m) Direction Period (s) | SE 8 | — | E 15 | E 8 | E 10 | SW 8 | S 7 | — | E 12 | — | S 9 | SE 11 | ESE 11 | E 11 | E 11 | S 12 | SE 11 | SE 8 | S 7 | SE 8 |
| kJ | 3 | — | 4 | 1 | 2 | 3 | 1 | — | 3 | — | 2 | 5 | 12 | 2 | 2 | 3 | 5 | 2 | 1 | 2 |
Wind waves Height (m) Direction Period (s) | S 5 | S 4 | SSE 4 | S 3 | SSE 4 | SSE 4 | SSE 3 | S 4 | S 2 | S 3 | S 3 | S 3 | S 3 | SSW 3 | — | SSW 3 | SSW 3 | — | — | ESE 2 |
| kJ | 11 | 5 | 3 | 6 | 5 | 3 | 3 | 2 | 1 | 11 | 2 | 1 | 5 | 4 | — | 3 | 2 | — | — | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 85 | 84 | 64 | 85 | 64 | 64 | 64 | 84 | 26 | 84 | 84 | 84 | 85 | 84 | 84 | 85 | 84 | 57 | 64 | 57 |
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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