Surf Forecasts:
Sosanji Rivermouth surf forecast from 6 Aug 2026:
- Best quality surf: Friday 7 Aug, 12AM (local time) - 20ft (6.0m), 14s period, ESE swell with onshore winds.
- Most powerful swell: Friday 7 Aug, 12AM (local time) - 20ft (6.0m), 14s period, ESE swell with 14,450 kJ wave energy.
- Next surfable swell (1★+): Friday 7 Aug, 12AM (local time) - 20ft (6.0m), 14s period with ESE swell.
Best Forecast Surf Conditions for Sosanji Rivermouth this week:
The surf forecast for Sosanji Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 07) at 12AM. The primary swell is predicted to be 6.0m and 14s period with a secondary swell of 5.5m and 14s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Sosanji Rivermouth in the next 16 days are 6.0m 14s and forecast to arrive on Friday (Aug 07) at 12AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 2s period and expected on Thursday (Aug 13) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 7th Aug) | 20ft (6.0m) 14s |
| Best Surf | 12AM (Fri 7th Aug) | 20ft (6.0m) 14s |
| Most Powerful | 12AM (Fri 7th Aug) | 20ft (6.0m) 14s |
Table - best surf conditions forecast for Sosanji Rivermouth over the next 16 days.
The Lowdown
Alright crew, Rusty here. Let’s break it down.
Look, the next couple of weeks at Sosanji Rivermouth are not looking great. The main problem is a massive, dangerous swell set to roar through. We’re looking at a combined energy of 38,504 (that’s strong to very strong) with a 23ft swell from the ESE on Thursday the 6th. That’s dangerous, not fun. The wind is a brutal 45 km/h cross-on, making it a total mess. That’s only for the absolute experts, and even then, it’s sketchy. The water temp is 84°, which is normal for the time of year.
That big swell sticks around for a few days, just dropping in size but staying blown out with onshore winds. Friday the 7th is still huge and messy, Saturday the 8th is the same story, Sunday the 9th is a write-off, and Monday the 10th is barely rideable with a 5ft swell but still onshore. It’s a rough patch.
We get a small window of hope on the 12th and 13th. The swell drops to a clean 3ft from the east, and on Wednesday morning the 12th, we get glassy conditions. The energy is weak (388), but it’s clean. Same again on Thursday morning the 13th – glassy, 3ft east swell. These are the best we’ll get in the first week, but the wave size is small and the break is pretty inconsistent, so don’t get your hopes up too high.
The week of the 14th to the 18th is back to poor conditions – onshore winds and rain. A real bummer.
Now, for the second week, there’s a glimmer of promise. On Wednesday morning the 19th of August, we get a 6ft swell from the east with a period of 9 seconds, and the wind is glassy. The energy is moderate (573). This is the standout of the whole forecast. The swell is getting a bit big for beginners, but for the experienced crew, this could be the one to wait for. The east swell direction is a good match for the break.
Then on Friday morning the 21st, we’ve got another glassy morning with a 5ft east swell. Still a solid option, but that Wednesday morning is the pick of the bunch. Just remember, this is a long way out, so keep an eye on the forecasts.
Rusty out.
Short Range ForecastHeavy rain (total 137mm), heaviest during Sun afternoon. Warm (max 28°C on Thu night, min 25°C on Sun afternoon). Winds decreasing (strong winds from the ENE on Thu night, light winds from the E by Sun afternoon). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sun night. Warm (max 28°C on Mon morning, min 25°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | ||||||||||||||
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) | ESE 14 | ESE 13 | SE 13 | SSE 12 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 14 | E 13 | E 12 | E 12 | E 12 | E 11 | E 11 | E 11 | E 10 | SSE 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 14450 | 11016 | 4552 | 2466 | 1809 | 1562 | 1259 | 857 | 670 | 1419 | 572 | 513 | 488 | 325 | 292 | 229 | 188 | 164 | 120 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | on | on | on | cross-on | on | on | glassy | glassy | on | off | glassy | cross-on | glassy |
High Tide | 11:14PM1.84m | 2:34PM1.58m | 00:24AM1.79m | 4:09PM1.71m | 1:55AM1.79m | 4:58PM1.85m | 3:13AM1.86m | 5:33PM1.97m | 4:12AM1.96m | 6:03PM2.06m | 5:01AM2.07m | 6:31PM2.13m | |||||||
Low Tide | 6:56AM0.70m | 6:41PM1.44m | 8:23AM0.61m | 8:51PM1.47m | 9:33AM0.47m | 10:08PM1.38m | 10:25AM0.34m | 10:56PM1.27m | 11:09AM0.24m | 11:33PM1.13m | 11:47AM0.18m | 00:07AM1.00m | |||||||
 |  | | | | | | | |  |  | | | |  |  | | | | |
 | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — |
 | 7:07 | — | 7:06 | — | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — |
mm | 16 | 10 | 9 | 17 | 6 | 10 | 28 | 14 | 27 | 1 | — | 1 | 1 | — | — | — | — | — | — |
Temp °C | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 26 | 27 | 28 | 28 | 27 | 28 | 28 | 26 | 27 | 28 | 26 |
Feels °C | 26 | 26 | 27 | 26 | 28 | 27 | 28 | 28 | 29 | 31 | 31 | 31 | 31 | 31 | 31 | 29 | 29 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | SE 14 | SE 13 | SE 13 | SSE 12 | SSE 12 | S 11 | S 11 | S 11 | ESE 8 | ESE 14 | E 13 | E 12 | E 12 | E 12 | E 11 | E 11 | E 11 | E 10 | SSE 10 |
| kJ | 13340 | 8952 | 4552 | 2466 | 1047 | 545 | 326 | 181 | 670 | 1419 | 572 | 513 | 488 | 325 | 292 | 229 | 188 | 164 | 120 |
Swell 2 Height (m) Direction Period (s) | — | — | ENE 16 | E 15 | E 15 | E 15 | E 15 | E 14 | E 14 | S 10 | ESE 7 | SE 6 | SSE 11 | SSE 11 | SSE 11 | SSE 10 | SSE 10 | SSE 10 | E 10 |
| kJ | — | — | 25 | 17 | 17 | 17 | 38 | 106 | 306 | 206 | 131 | 64 | 292 | 153 | 153 | 177 | 133 | 131 | 98 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SE 16 | S 15 | SSE 11 | S 14 | S 10 | S 10 | ESE 14 | SSE 7 | SSE 7 | E 14 | ESE 13 | NE 4 | NNE 4 |
| kJ | — | — | — | — | — | — | 10 | 106 | 198 | 65 | 161 | 161 | 18 | 59 | 41 | 35 | 16 | 4 | 2 |
Wind waves Height (m) Direction Period (s) | ESE 14 | ESE 13 | E 11 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | — | ESE 8 | — | ESE 6 | — | — | — | — | — | — | SSW 2 |
| kJ | 14450 | 11016 | 3183 | 2463 | 1809 | 1562 | 1259 | 857 | — | 322 | — | 71 | — | — | — | — | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 288 | 803 | 791 | 288 | 700 | 791 | 199 | 199 | 358 | 37 | 47 | 310 | 0 | 0 | 51 | 0 | 0 | 116 | 0 |
Best forecast wave conditions in Kyu Shu | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
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Information about the Sosanji Rivermouth Surf forecast
The above surf forecast table for Sosanji Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Sosanji Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Sosanji 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 (Sosanji 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 Sosanji 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.
Sosanji Rivermouth is 12 km (7 miles) from Miyazaki-shi. If you plan a holiday in Kyu Shu, look for hotels and other accommodation in Miyazaki-shi. Miyazaki-shi has rooms for a wide range of budgets as well as car hire and transport links.
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