Surf Forecasts:
Tengan surf forecast from 18 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 6PM (local time) - 8ft (2.5m), 9s period, SE swell with 1,099 kJ wave energy.
Best Forecast Surf Conditions for Tengan this week:
The most powerful waves expected at Tengan in the next 16 days are 2.5m 9s and forecast to arrive on Thursday (Aug 20) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 9s period and expected on Saturday (Aug 22) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 6PM (Thu 20th Aug) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Tengan over the next 16 days.
The Lowdown
Alright, Rusty here, let’s break down what’s cooking for Tengan.
Honestly, the first week and a half is a total bust. From Tuesday the 18th all the way through to the 25th, it’s a mess – onshore winds, short-period chop, and nothing worth paddling out for. The wave energy is weak, from 52 to 378, and it’s all stormy or blown out. Save your energy.
The real story starts on Wednesday the 26th of August. The wind goes glassy – dead calm – and we finally get a proper groundswell from the ESE at 1.7m, 14-second period, and the combined energy jumps to 1187. That’s solid, strong energy. Tengan is a reef break, and it’s inconsistent, so you’ll be waiting between sets, but when it’s glassy like that, it’s a dream. Water temp is about 29°F, which is average for the season.
It builds through Thursday the 27th and Friday the 28th, with swell hitting 2.1m to 2.5m and periods stretching to 15 seconds. The energy goes through the roof – 3307 on Friday morning. That’s very strong, powerful stuff. The wind stays glassy, so it’s pristine. But this is expert-only territory. Over 2.5m, long period, on a reef? Leave the foam boards at home.
Saturday the 29th of August brings the biggest swell – 3.5m – with energy hitting 7427 in the afternoon. But the wind turns cross-onshore, and the quality fades. It’s still big, but it’s not clean. By Sunday the 30th, it’s big and lumpy with a shorter period, more of a kite session than a surf session.
Monday the 31st is still big but choppy. Then Tuesday the 1st of September gives one last clean window with 2.5m swell and a cross-off wind, but the period drops to 8 seconds, so it’s less exciting. After that, it fades.
So here’s the bottom line: skip the first eight days. The gold is Wednesday the 26th through Friday the 28th of August – glassy, long-period, powerful groundswell. If you’ve got the skills, that’s your window. The reef is inconsistent, but the quality will be top-notch.
Rusty
Short Range ForecastHeavy rain (total 75mm), heaviest during Thu night. Warm (max 29°C on Tue afternoon, min 26°C on Thu afternoon). Winds decreasing (fresh winds from the ESE on Thu morning, light winds from the SE by Thu night). | Days 5-7 Weather SummaryHeavy rain (total 128mm), heaviest during Fri afternoon. Warm (max 28°C on Mon morning, min 25°C on Fri afternoon). Mainly fresh winds. | |||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 4 | E 7 | E 5 | ESE 7 | ESE 8 | ESE 8 | ESE 8 | SE 8 | ESE 7 | ESE 6 | ESE 10 | ENE 9 | SE 9 | E 16 | E 13 | E 13 | E 10 | ENE 11 | ENE 10 | SE 4 |
Wave Graph  | ||||||||||||||||||||
 kJ | 48 | 123 | 104 | 219 | 318 | 323 | 605 | 322 | 173 | 33 | 18 | 8 | 42 | 5 | 14 | 14 | 8 | 11 | 10 | 16 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | off | glassy | cross | cross-on | cross-on | cross-on | on | on | on |
High Tide | 9:55PM1.99m | 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 | ||||||||
Low Tide | 3:48PM0.85m | 4:38AM0.67m | 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 | |||||||
 |  |  | | | | | | | | | | | | | |  | |  | | |
 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — |
mm | — | 2 | 3 | 3 | 3 | 2 | 9 | 39 | 14 | 37 | 19 | 12 | 11 | 44 | 4 | 1 | — | — | — | — |
Temp °C | 29 | 28 | 28 | 28 | 28 | 27 | 27 | 26 | 26 | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 27 | 28 | 28 | 27 |
Feels °C | 30 | 30 | 29 | 29 | 29 | 27 | 30 | 28 | 28 | 28 | 27 | 31 | 31 | 29 | 28 | 27 | 27 | 28 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 9 | SW 9 | SW 9 | SW 8 | SW 8 | S 10 | S 10 | S 9 | S 9 | S 9 | ESE 10 | E 8 | SW 10 | SW 10 | SW 10 | SW 10 | SW 10 | SW 9 | SW 10 | SSW 8 |
| kJ | 36 | 36 | 19 | 11 | 11 | 66 | 65 | 106 | 123 | 125 | 18 | 1 | 566 | 222 | 369 | 442 | 200 | 112 | 115 | 150 |
Swell 2 Height (m) Direction Period (s) | S 7 | E 10 | S 8 | S 8 | SSW 8 | SW 9 | SW 9 | SW 9 | SW 10 | SW 10 | E 14 | ENE 9 | SE 9 | E 13 | E 13 | ENE 10 | E 10 | W 8 | W 7 | ENE 10 |
| kJ | 4 | 7 | 1 | 5 | 7 | 12 | 13 | 12 | 36 | 133 | 4 | 8 | 42 | 4 | 14 | 10 | 8 | 5 | 4 | 9 |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 11 | — | — | — | — | — | — | — | ESE 10 | E 14 | E 14 | ENE 9 | E 16 | E 13 | E 13 | SE 11 | ENE 11 | ENE 10 | E 12 |
| kJ | 4 | 4 | — | — | — | — | — | — | — | 9 | 4 | 4 | 15 | 5 | 14 | 14 | 5 | 11 | 10 | 12 |
Wind waves Height (m) Direction Period (s) | E 4 | E 7 | E 5 | ESE 7 | ESE 8 | ESE 8 | ESE 8 | SE 8 | ESE 7 | ESE 6 | SSW 9 | S 9 | SSE 7 | S 9 | SSE 9 | S 9 | SSE 8 | SSE 8 | SSE 8 | SE 4 |
| kJ | 48 | 123 | 104 | 219 | 318 | 323 | 605 | 322 | 173 | 33 | 579 | 1126 | 154 | 741 | 463 | 554 | 306 | 277 | 170 | 16 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1009 | 12 | 647 | 805 | 613 | 647 | 745 | 613 | 13 | 13 | 613 | 647 | 12 | 621 | 13 | 621 | 621 | 613 | 13 | 13 |
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.
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