
Surf Forecasts:
Tengan surf forecast from 8 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 12PM (local time) - 5.5ft (1.7m), 10s period, N swell with 529 kJ wave energy.
Best Forecast Surf Conditions for Tengan this week:
The most powerful waves expected at Tengan in the next 16 days are 1.7m 10s and forecast to arrive on Thursday (Sep 10) at 12PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 6s period and expected on Saturday (Sep 12) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 12PM (Thu 10th Sep) | 5.5ft (1.7m) 10s |
Table - best surf conditions forecast for Tengan over the next 16 days.
The Lowdown
Alright crew, let’s get into it. Looking at the next couple weeks, it’s a slow grind to start, with a few windows of hope scattered in there. We’ve got a long stretch of poor conditions early on, but things do start to get a bit more interesting as we roll into the third week. Don’t get too excited too early, but there is something to keep an eye on.
The first real chance to even think about a wave comes in on Thursday the 10th. It’s not going to be pumping, but there’s a hint of life. We’re looking at around 6ft of north-northwest swell with a period around 9 seconds at Tengan. The combined energy is moderate at 498. It’s still a bit messy with a cross breeze, so you’ll be working for it, but it’s surfable. Conditions improve slightly into the afternoon with a lighter cross breeze and the swell holding around 5ft. It’s a marginal call, so don't expect miracles.
After that, it gets pretty grim again. From Friday the 11th right through to the 20th, the surf basically goes flat and onshore winds and storms mess with the surface. This is a long stretch of nothing, a week or more with no decent options. The swell drops, the wind gets ugly, and energy readings are mostly weak, well under 200. On the 18th we get a brief clean offshore window, but the swell is only around 3ft with a short period, so it won’t be doing much. This is a dead zone, so don’t even bother stringing up your board.
Now, here’s the standout. The action starts to build on Monday the 21st of September. We’ve got a proper groundswell arriving from the east with a very long period of 18 seconds. The swell tops out around 7ft, and the combined energy is strong, hitting 2666 in the afternoon. This is the real deal. The winds are tipped to be cross-off and clean, making Tengan (Big Island) look like a solid choice. This reef setup is usually fairly exposed to that north-east swell, and with this kind of period, it should be organizing well. Expect some solid, deep waves. The 22nd also sees good energy with a 5ft east swell and a 16-second period, so this pulse should have some legs.
Keep in mind, we don’t have any solid info on crowds, but spots like this can be popular when the surf finally shows up. It’s been a long wait, so a few other folks might have the same idea.
The water is warm, sitting around 84°F at the start, which is pretty average for this time of year. Bring the boardshorts.
So, don't give up hope. It’s a long, flat stretch, but that end-of-month pulse looks like the one to point the car at. It’s a bit far out, so treat it as promising, but not a done deal yet.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Fri morning. Warm (max 28°C on Tue afternoon, min 26°C on Tue night). Winds decreasing (fresh winds from the NNW on Tue afternoon, light winds from the NNE by Thu morning). | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Sun afternoon. Warm (max 29°C on Fri afternoon, min 26°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Tue 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | ||||||||||||||
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) | NNW 9 | N 8 | N 8 | N 8 | N 8 | N 9 | N 10 | N 9 | N 9 | N 8 | N 8 | N 8 | N 7 | N 7 | E 14 | E 14 | ESE 8 | ESE 8 | E 9 | E 9 |
Wave Graph | ||||||||||||||||||||
586 | 308 | 245 | 291 | 277 | 427 | 480 | 347 | 220 | 140 | 74 | 72 | 51 | 36 | 35 | 36 | 44 | 53 | 56 | 78 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross | cross | cross | cross | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on |
High Tide | 5:29PM1.94m | 4:49AM2.05m | 6:03PM2.05m | 5:39AM2.17m | 6:33PM2.13m | 6:23AM2.23m | 7:00PM2.17m | 7:04AM2.23m | 7:26PM2.19m | 7:42AM2.18m | 7:49PM2.18m | 8:20AM2.09m | 8:12PM2.15m | |||||||
Low Tide | 11:06PM1.03m | 11:31AM0.30m | 11:48PM0.85m | 12:11PM0.26m | 00:26AM0.68m | 12:46PM0.28m | 1:02AM0.54m | 1:17PM0.36m | 1:35AM0.44m | 1:46PM0.47m | 2:08AM0.39m | 2:13PM0.61m | 2:40AM0.38m | |||||||
— | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | |
6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | |
mm | — | — | — | — | — | — | — | 2 | 4 | — | 1 | — | — | — | 1 | 3 | — | 2 | 2 | 14 |
Temp °C | 28 | 27 | 28 | 28 | 26 | 28 | 28 | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 28 | 27 |
Feels °C | 28 | 28 | 28 | 28 | 27 | 33 | 33 | 32 | 31 | 32 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | ENE 9 | S 8 | S 8 | S 8 | ESE 9 | N 9 | N 10 | N 9 | N 9 | N 8 | N 8 | N 8 | N 7 | N 7 | N 6 | E 6 | ESE 8 | ESE 8 | E 9 | E 9 |
7 | 5 | 5 | 5 | 17 | 427 | 480 | 347 | 220 | 140 | 74 | 72 | 51 | 34 | 19 | 18 | 44 | 53 | 56 | 78 | |
Swell 2 Height (m) Direction Period (s) | SW 8 | SW 9 | SW 8 | E 9 | S 7 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 6 | E 15 | E 14 | E 14 | SSE 8 | SSE 7 | N 6 | N 6 | E 13 | E 13 | NNE 5 |
10 | 3 | 3 | 6 | 4 | 17 | 16 | 30 | 26 | 8 | 19 | 35 | 36 | 11 | 16 | 12 | 6 | 31 | 30 | 17 | |
Swell 3 Height (m) Direction Period (s) | S 8 | ENE 8 | E 9 | SW 8 | SW 8 | SSE 9 | S 7 | E 16 | E 15 | ESE 9 | ESE 10 | E 9 | S 9 | E 14 | E 14 | E 14 | E 13 | S 7 | SW 10 | E 13 |
5 | 6 | 6 | 3 | 3 | 7 | 4 | 5 | 17 | 9 | 9 | 2 | 6 | 36 | 35 | 36 | 32 | 4 | 4 | 14 | |
Wind waves Height (m) Direction Period (s) | NNW 9 | N 8 | N 8 | N 8 | N 8 | — | — | — | — | — | SE 6 | SE 6 | SE 6 | ESE 6 | E 5 | NE 3 | NE 4 | NNE 4 | NNE 4 | — |
586 | 308 | 245 | 291 | 277 | — | — | — | — | — | 18 | 47 | 33 | 25 | 20 | 2 | 12 | 11 | 12 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 648 | 621 | 647 | 647 | 972 | 12 | 12 | 10 | 10 | 10 | 10 | 10 | 13 | 12 | 13 | 13 | 13 | 13 | 12 | 12 |
Best forecast wave conditions in Okinawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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Information about the Tengan Surf forecast
The above surf forecast table for Tengan provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Tengan can be found by selecting the local surf guide option on the grey menu. Our Tengan 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 (Tengan) 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 Tengan 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.
Tengan is 5 km (3 miles) from the city of Ishikawa. If you plan a holiday in Okinawa, look for hotels and other accommodation in Ishikawa. Ishikawa has rooms for a wide range of budgets as well as car hire and transport links.










