Surf Forecasts:
Tengan surf forecast from 9 Aug 2026:
- Most powerful swell: Monday 10 Aug, 6PM (local time) - 3ft (0.9m), 13s period, E swell with 273 kJ wave energy.
Best Forecast Surf Conditions for Tengan this week:
The most powerful waves expected at Tengan in the next 16 days are 0.9m 13s and forecast to arrive on Monday (Aug 10) 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 1.6m 11s period and expected on Monday (Aug 10) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 6PM (Mon 10th Aug) | 3ft (0.9m) 13s |
Table - best surf conditions forecast for Tengan over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be straight with you. We’ve got a long 16-day window ahead, but honestly, there’s no surf to get excited about. The whole period is a write-off. I can't recommend a single session because the conditions are just no good.
We’re looking at Tengan, a reef break that’s inconsistent and beginner-friendly at best. It’s open to swell from the NE, but the waves we’re seeing are tiny, poorly organised, and the wind is a mess most of the time.
Right at the start, Monday morning the 10th of August, we get some cross-onshore wind at 12 mph and a weak 3 ft swell from the east with a period of 14 seconds. The combined wave energy is just 236 – moderate, but the wind chops it up, so it's a no-go. It’s poor surf conditions across the board.
From Tuesday the 11th through to the 20th of August, the swell stays below 3 ft, with periods all over the shop, from short 7-second stuff to longer 12-second groundswell, but the energy is weak. The combined energy values are mostly two-digit numbers like 40, 25, or even as low as 8 – that’s weak, barely a ripple. The wind is mostly onshore or cross-onshore, and we get a few glassy moments on the 13th and 14th of August, but with swell heights of 1 ft or 2 ft, it’s just flat.
There’s a bit of a pulse around the 21st of August – Friday morning we see 5 ft from the SE with a short 8-second period and combined energy of 331 – that’s the only moderate spike in the whole run. But it’s lumpy with fresh cross-onshore wind at 19 mph. No good for a paddle; you’d be better off on a kite if you’re into that.
After that, it trails off into tiny, onshore slop for the rest of the month. The 24th of August has a swell from the ESE at 0.7 ft with a long 11-second period, but combined energy is a pathetic 18. By the 25th of August, it’s even smaller.
Water temperature on the 10th of August is 86°F, which is about normal for this time of year – no big anomaly.
So yeah, a solid two-week gap with nothing to recommend. This happens sometimes in this area when the pattern goes quiet. Don’t lose hope – forecasts can change. But for now, keep the board in the car.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Wed morning. Warm (max 30°C on Mon morning, min 26°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Thu afternoon. Warm (max 29°C on Fri morning, min 27°C on Thu morning). Wind will be generally light. | ||||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | |||||||||||||||
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 14 | ESE 7 | E 12 | E 12 | E 12 | ENE 12 | ENE 11 | ENE 11 | N 9 | N 8 | N 7 | N 7 | N 7 | N 7 | SW 8 | ENE 11 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 236 | 61 | 113 | 73 | 72 | 46 | 40 | 39 | 24 | 28 | 25 | 8 | 16 | 8 | 0 | 24 | 23 | 22 | 37 | 21 | 33 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross | cross | off | cross-off | cross | cross-on | glassy | cross-on | glassy | glassy | cross-on | cross-on | cross-on | cross-on | on | on | on |
High Tide | 5:50PM1.94m | 4:48AM2.07m | 6:30PM2.05m | 5:43AM2.19m | 7:07PM2.13m | 6:32AM2.26m | 7:41PM2.16m | 7:17AM2.27m | 8:11PM2.17m | 7:59AM2.21m | 8:39PM2.15m | 8:41AM2.10m | 9:05PM2.12m | ||||||||
Low Tide | 10:54AM0.32m | 11:13PM1.17m | 11:46AM0.19m | 00:02AM1.03m | 12:32PM0.12m | 00:45AM0.90m | 1:12PM0.12m | 1:25AM0.78m | 1:49PM0.19m | 2:04AM0.69m | 2:22PM0.31m | 2:42AM0.63m | 2:52PM0.48m | ||||||||
 |  |  |  |  | | |  |  | | | | | |  | | | | | | | |
 | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — |
 | — | 7:08 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:05 | — | — | 7:04 | — |
mm | — | — | 1 | 3 | — | 3 | 4 | 1 | 3 | 2 | 3 | 1 | — | — | — | — | — | 2 | 3 | 4 | 19 |
Temp °C | 30 | 29 | 28 | 29 | 28 | 28 | 27 | 26 | 26 | 28 | 28 | 27 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 27 |
Feels °C | 32 | 30 | 31 | 33 | 32 | 33 | 30 | 28 | 29 | 33 | 33 | 31 | 34 | 33 | 32 | 33 | 32 | 32 | 33 | 33 | 30 |
Swell 1 Height (m) Direction Period (s) | SW 11 | SW 11 | SW 10 | SW 10 | SW 10 | S 10 | S 9 | S 9 | S 9 | SW 8 | SW 8 | SW 10 | SW 8 | SSW 9 | SW 8 | SSW 8 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 |
| kJ | 558 | 496 | 266 | 188 | 188 | 148 | 103 | 79 | 76 | 82 | 69 | 74 | 74 | 94 | 57 | 113 | 116 | 127 | 132 | 138 | 135 |
Swell 2 Height (m) Direction Period (s) | W 10 | S 11 | S 10 | S 10 | S 10 | SW 9 | SW 9 | SW 9 | SW 8 | S 9 | S 8 | S 9 | S 8 | W 7 | S 9 | W 7 | W 7 | ENE 11 | ENE 10 | W 8 | W 7 |
| kJ | 247 | 274 | 254 | 192 | 192 | 144 | 103 | 78 | 57 | 39 | 34 | 56 | 35 | 16 | 36 | 10 | 9 | 22 | 37 | 19 | 16 |
Swell 3 Height (m) Direction Period (s) | E 14 | W 10 | E 12 | E 12 | E 12 | ENE 12 | ENE 11 | ENE 11 | N 9 | N 8 | N 7 | N 7 | N 7 | N 7 | W 6 | ENE 11 | ENE 11 | W 7 | W 7 | ENE 10 | ENE 10 |
| kJ | 236 | 116 | 113 | 73 | 72 | 46 | 40 | 39 | 24 | 28 | 25 | 8 | 16 | 8 | 7 | 24 | 23 | 9 | 9 | 21 | 33 |
Wind waves Height (m) Direction Period (s) | S 11 | ESE 7 | ESE 6 | E 6 | — | — | — | — | E 5 | — | — | — | — | — | — | — | ESE 5 | SE 3 | — | — | — |
| kJ | 388 | 61 | 25 | 18 | — | — | — | — | 5 | — | — | — | — | — | — | — | 2 | 1 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 10 | 13 | 10 | 10 | 10 | 13 | 11 | 11 | 13 | 13 | 14 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 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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