Surf Forecasts:
Tengan surf forecast from 19 Aug 2026:
- Most powerful swell: Wednesday 26 Aug, 3AM (local time) - 7.5ft (2.3m), 16s period, E swell with 2,633 kJ wave energy.
Best Forecast Surf Conditions for Tengan this week:
The most powerful waves expected at Tengan in the next 16 days are 2.3m 16s and forecast to arrive on Wednesday (Aug 26) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 5.0m 11s period and expected on Sunday (Aug 23) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3AM (Wed 26th Aug) | 7.5ft (2.3m) 16s |
Table - best surf conditions forecast for Tengan over the next 16 days.
The Lowdown
Alright, grab your board and let’s get into it. The next couple of weeks are looking a bit rough, to be honest. We’ve got a lot of wind and lumpy conditions in the mix, but there are a couple of windows where things could get real fun. Let’s break it down.
For the first several days, it’s pretty grim. We’re looking at stormy skies and wind that’s all over the place. The swell is there, but it’s messy. On Saturday the 22nd, the swell jumps to 12ft, but it’s coming with a strong cross-onshore breeze. That’s going to be a complete mess – not worth your time unless you’re into getting thrashed. The energy is strong, hitting 2007, but that just means power with no shape. This run of poor surf continues through to the start of next week.
Then, things get interesting around Tuesday the 25th. We see a long-period swell starting to fill in, with 5ft and a 16-second period in the morning. By the afternoon it’s 6ft and the energy is jumping to 1544. The wind is still an issue, but you can see the potential. It’s not until the 26th that things look like they might clean up. That morning we have 8ft of ESE swell with a 16-second period, and the wind finally swings offshore, cross-off from the NNW. The energy is strong at 2540. This is the first real standout. Tengan (Big Island) is the break to be at. The wind will be strong, so it’ll be a battle, but the waves will be holding a good shape. It’s more of an expert’s wave at this size and power, but it’s the best thing on offer so far.
The wind stays offshore for the rest of that week, which is great for the surface, but it gets dangerously strong. The 27th has storm-force winds, and even though it’s clean, you’re looking at 7ft to 8ft waves that are going to be gnarly and hard to handle. The period drops back down to 7-9 seconds, so it’s more of a windswell mix, making it a real handful. It’s late August, and this is going to be a serious, powerful stretch.
Now, here’s where I get a little excited. The real gem in this forecast is the short window around Saturday the 29th. The morning has 7ft of N swell at 11 seconds, with a strong offshore wind. It’ll be clean, but hard to paddle into. The afternoon, though, is the standout. The swell builds to 8ft from the NW with a 10-second period, and the wind eases to a moderate offshore from the west. The energy is a solid 1250. This has the makings of a proper session – powerful, clean, and holding its shape. This is the one to circle on the calendar.
After that, it all fades away quickly. The 30th and 31st are small and weak. Into the first of September, there’s a tease of clean, small waves with a very long 17-second period, but it’s only 2ft. Not really worth the paddle. The energy is moderate at 429, but there’s just not enough push. After that, it’s back to small, weak, and messy for the first few days of September.
So, to wrap it up: you’ve got a rough start, one solid, powerful day on the 26th, and then the clear winner is the afternoon of the 29th. That’s your best bet. Expect crowds, as it’s a good-looking wave. It’s been a while since we’ve had a proper clean one, so everyone will be out. The water temp is sitting around 84°F, which is about normal for this time of year, so you won’t need a wetsuit.
Keep an eye on the forecasts, but for now, that’s the plan.
Rusty
Short Range ForecastHeavy rain (total 45mm), heaviest during Fri afternoon. Warm (max 28°C on Wed morning, min 25°C on Fri night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 29mm), heaviest during Sun night. Warm (max 28°C on Mon morning, min 26°C on Sat morning). Winds increasing (light winds from the ESE on Sat afternoon, near gales from the ESE by Sun morning). | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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) | E 7 | E 7 | ESE 8 | ESE 8 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | SE 10 | SE 9 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | ENE 13 | E 5 | ESE 15 | ESE 16 | ESE 16 | ESE 16 |
Wave Graph | |||||||||||||||||||||
152 | 139 | 143 | 209 | 168 | 128 | 282 | 82 | 1316 | 2007 | 0 | 0 | 0 | 0 | 0 | 16 | 92 | 256 | 1055 | 1358 | 2226 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | cross-on | cross |
High Tide | 10:54AM1.63m | 10:22PM1.90m | 12:02PM1.49m | 10:56PM1.79m | 2:22PM1.43m | 11:51PM1.67m | 4:38PM1.54m | 1:49AM1.61m | 5:20PM1.67m | 3:33AM1.68m | 5:47PM1.78m | 4:32AM1.81m | 6:10PM1.88m | ||||||||
Low Tide | 4:16PM1.03m | 5:27AM0.75m | 4:49PM1.21m | 6:38AM0.83m | 5:48PM1.37m | 8:31AM0.85m | 8:45PM1.43m | 10:03AM0.76m | 10:24PM1.33m | 10:55AM0.64m | 11:07PM1.21m | 11:31AM0.52m | 11:38PM1.07m | ||||||||
6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | |
— | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | |
mm | 2 | 3 | 5 | 3 | 3 | 7 | 4 | 7 | 11 | 2 | 3 | 8 | 2 | 6 | 6 | 1 | 1 | — | — | — | — |
Temp °C | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 26 | 27 | 27 | 27 | 26 | 27 | 28 | 28 | 27 | 29 | 29 | 27 |
Feels °C | 30 | 30 | 30 | 30 | 28 | 28 | 29 | 29 | 29 | 23 | 30 | 27 | 24 | 22 | 24 | 26 | 27 | 26 | 30 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 9 | SW 8 | S 9 | S 10 | S 9 | S 9 | S 9 | SSW 9 | SW 10 | SW 10 | SW 10 | SW 11 | SW 10 | SW 10 | SW 11 | SW 10 | SSE 10 | SSE 10 | ESE 16 | ESE 16 | ESE 16 |
19 | 11 | 13 | 45 | 78 | 74 | 74 | 199 | 181 | 281 | 240 | 258 | 177 | 180 | 137 | 87 | 391 | 230 | 1055 | 1358 | 2226 | |
Swell 2 Height (m) Direction Period (s) | S 8 | S 8 | SW 8 | SW 9 | SW 9 | SW 9 | SW 9 | ESE 7 | — | — | — | — | W 8 | W 7 | W 7 | W 8 | SW 10 | ESE 15 | SSE 9 | S 10 | SW 9 |
1 | 5 | 11 | 12 | 13 | 12 | 65 | 82 | — | — | — | — | 10 | 4 | 4 | 12 | 129 | 256 | 103 | 65 | 43 | |
Swell 3 Height (m) Direction Period (s) | SE 10 | — | — | — | — | — | — | E 9 | — | — | — | — | — | — | — | ENE 13 | ESE 16 | SW 10 | SW 10 | SW 10 | S 10 |
4 | — | — | — | — | — | — | 24 | — | — | — | — | — | — | — | 16 | 25 | 80 | 47 | 47 | 48 | |
Wind waves Height (m) Direction Period (s) | E 7 | E 7 | ESE 8 | ESE 8 | ESE 7 | ESE 7 | ESE 7 | — | SE 10 | SE 9 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | E 5 | E 7 | ENE 5 | ENE 7 | NNE 5 |
152 | 139 | 143 | 209 | 168 | 128 | 282 | — | 1316 | 2007 | 2149 | 2811 | 2049 | 1255 | 1568 | 1138 | 92 | 210 | 109 | 186 | 47 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 647 | 12 | 13 | 621 | 13 | 13 | 13 | 613 | 621 | 621 | 12 | 613 | 613 | 636 | 613 | 647 | 840 | 621 | 13 | 647 | 631 |
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.











