Surf Forecasts:
Sakawa River surf forecast from 30 Jul 2026:
- Best quality surf: Tuesday 4 Aug, 3PM (local time) - 11ft (3.5m), 17s period, SE swell with cross-onshore winds.
- Most powerful swell: Thursday 6 Aug, 9AM (local time) - 13ft (4.0m), 17s period, SSE swell with 9,526 kJ wave energy.
- Next surfable swell (1★+): Saturday 1 Aug, 9PM (local time) - 2ft (0.6m), 16s period with ESE swell.
Best Forecast Surf Conditions for Sakawa River this week:
The surf forecast for Sakawa River over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 01) at 9PM. The primary swell is predicted to be 0.6m and 16s period with a secondary swell of 0.3m and 6s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Sakawa River in the next 16 days are 4.0m 17s and forecast to arrive on Thursday (Aug 06) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Wednesday (Aug 05) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 1st Aug) | 2ft (0.6m) 16s |
| Best Surf | 3PM (Tue 4th Aug) | 11ft (3.5m) 17s |
| Most Powerful | 9AM (Thu 6th Aug) | 13ft (4.0m) 17s |
Table - best surf conditions forecast for Sakawa River over the next 16 days.
The Lowdown
Alright, Rusty here, checking out the Sakawa River stretch. The first few days are a no-go, but we’ve got a proper groundswell and then a big, ugly wall of water coming.
First real chance is Sunday, August 2nd. Morning glass with a 3ft swell from the ESE, long 16-second period. Combined energy is moderate (536). That’s a groundswell, and with the light offshore wind, it’ll be clean. The period is a bit long for a river mouth, so it might not be a perfect peak, but it’s the best wave of the week. Get the dawn patrol. The afternoon turns cross-on, so it’s a morning mission.
Then it goes big. Monday, August 3rd starts with a 6ft swell from the ESE, 17-second period, and strong energy (2100). The wind is cross-shore, so the shape is questionable. The swell just keeps pumping. By Tuesday, August 4th, we’re talking 10ft in the morning, hitting 12ft by the afternoon from the SE. The wave energy is massive (6356), and the wind is favourable, but the swell is way too big for this spot. This is for the hardcore crew only. That pattern sticks through Thursday, August 7th, with 13ft swells and offshore winds, but the river mouth will be a beast. Average Joe should stay on the beach.
The swell crashes down after that. Saturday, August 8th has a 4ft swell from the SSW, but the winds are onshore or cross-on. The combined energy is moderate (1010). It’s a letdown. The rest of the window from Sunday, August 9th, onward is flat and poor. The swell stays under 4ft, the winds are choppy and cross-on, and the energy is weak. There’s a long dry spell from the 9th to the 15th.
The water temp is about normal for this time of year.
The standout is Sunday morning, August 2nd. That 3ft, 16-second ESE groundswell with glassy conditions is the only clean, manageable wave. The big stuff from the 3rd to the 7th is for the experts and the nuts.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Sat afternoon. Warm (max 31°C on Fri morning, min 27°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 30°C on Tue afternoon, min 24°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | ||||||||||||||
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 6 | S 6 | S 6 | S 7 | SE 9 | ESE 15 | ESE 17 | ESE 16 | SE 15 | ESE 16 | ESE 17 | SE 17 | SE 18 | SE 17 | SE 17 | SE 16 | SE 17 | SSE 17 | SSE 17 |
Wave Graph  | |||||||||||||||||||
 kJ | 21 | 20 | 21 | 14 | 12 | 21 | 261 | 525 | 489 | 921 | 2072 | 2746 | 3825 | 5499 | 6262 | 6522 | 8748 | 9317 | 8821 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross-on | glassy | glassy | cross-on | glassy | glassy | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross | on | cross |
High Tide | 5:00AM1.48m | 6:35PM1.44m | 5:38AM1.47m | 6:56PM1.46m | 6:18AM1.43m | 7:18PM1.46m | 7:00AM1.37m | 7:41PM1.46m | 7:48AM1.28m | 8:05PM1.45m | 8:47AM1.18m | 8:33PM1.43m | |||||||
Low Tide | 11:31PM0.83m | 11:50AM0.15m | 00:04AM0.75m | 12:19PM0.20m | 00:38AM0.68m | 12:47PM0.29m | 1:15AM0.61m | 1:15PM0.41m | 1:55AM0.55m | 1:44PM0.55m | 2:41AM0.50m | 2:14PM0.72m | |||||||
 |  | | | |  |  | | | | |  | |  | |  | | | | |
 | — | 4:50 | — | — | 4:50 | — | — | 4:52 | — | — | 4:52 | — | — | 4:52 | — | — | 4:54 | — | — |
 | 6:49 | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — |
mm | — | — | — | — | — | 2 | 1 | 1 | 2 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 30 | 31 | 30 | 28 | 30 | 30 | 29 | 31 | 31 | 27 | 28 | 28 | 26 | 28 | 30 | 26 | 29 | 30 | 26 |
Feels °C | 34 | 34 | 33 | 33 | 34 | 34 | 35 | 36 | 35 | 31 | 30 | 29 | 27 | 28 | 31 | 28 | 30 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | S 6 | S 6 | SE 9 | S 7 | SSW 7 | SSW 6 | ESE 17 | ESE 16 | SE 15 | ESE 16 | ESE 17 | SE 17 | SE 18 | SE 17 | SE 17 | SE 16 | SE 17 | SSE 17 | SSE 17 |
| kJ | 21 | 20 | 14 | 14 | 9 | 8 | 261 | 525 | 489 | 921 | 2072 | 2746 | 3825 | 5499 | 6262 | 6522 | 8748 | 9317 | 8821 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 9 | SE 13 | SSE 11 | SE 9 | SE 9 | SE 10 | SSE 9 | SE 9 | S 9 | S 9 | ENE 14 | E 14 | ENE 14 | — | — | — | — | E 10 |
| kJ | 14 | 14 | 7 | 11 | 12 | 12 | 14 | 9 | 20 | 15 | 6 | 65 | 34 | 37 | — | — | — | — | 171 |
Swell 3 Height (m) Direction Period (s) | SE 12 | SE 13 | SE 11 | ESE 9 | SE 10 | ESE 15 | S 5 | S 5 | SSE 10 | — | — | — | — | — | — | — | — | — | — |
| kJ | 6 | 6 | 5 | 8 | 4 | 21 | 5 | 2 | 9 | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | S 6 | — | — | — | — | — | SSW 5 | ENE 4 | NE 4 | — | ENE 5 | — | ENE 7 | — | NE 4 | — | — |
| kJ | — | — | 21 | — | — | — | — | — | 5 | 17 | 22 | — | 47 | — | 94 | — | 52 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 66 | 50 | 96 | 82 | 90 | 68 | 0 | 0 | 27 | 30 | 38 | 66 | 30 | 38 | 27 | 30 | 30 | 40 | 29 |
Best forecast wave conditions in Kanagawa | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
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Information about the Sakawa River Surf forecast
The above surf forecast table for Sakawa River provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Sakawa River can be found by selecting the local surf guide option on the grey menu. Our Sakawa River 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 (Sakawa River) 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 Sakawa River 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.
Sakawa River is 2 km (1 miles) from Odawara. If you plan a holiday in Kanagawa, look for hotels and other accommodation in Odawara. Odawara has rooms for a wide range of budgets as well as car hire and transport links.
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