Surf Forecasts:
Tengan surf forecast from 11 Aug 2026:
- Most powerful swell: Tuesday 18 Aug, 12AM (local time) - 1.5ft (0.4m), 11s period, ENE swell with 47 kJ wave energy.
Best Forecast Surf Conditions for Tengan this week:
The most powerful waves expected at Tengan in the next 16 days are 0.4m 11s and forecast to arrive on Tuesday (Aug 18) 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 0.9m 9s period and expected on Tuesday (Aug 11) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 12AM (Tue 18th Aug) | 1.5ft (0.4m) 11s |
Table - best surf conditions forecast for Tengan over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on offer.
Well, I’ll be honest with you, the outlook for Tengan is a tough one to swallow. We’re looking at a solid 16-day window, but the first week is a real struggle with tiny, weak swells and not a single session that’s worth paddling out for. The combined wave energy is almost non-existent, never breaking past 72 (weak energy), and the conditions are mostly poor. There’s a bit of a gap here with no real recommendations until we get deeper into the second week.
The water temperature is sitting at 84°F, which is about average for this time of year, so at least you won't be cold while you're sitting there waiting.
The real standout, and probably the only window worth circling on your calendar, is the morning of Wednesday, August 26th. Tengan (reef) is looking at a modest 3ft swell from the ESE, with a period of 10 seconds. The combined energy bumps up to 146 (moderate wave energy), which is the most juice we see in the whole period. The wind is a cross-onshore from the SE at 16 mph, which will keep the surface a little choppy and messy, but it’s the best swell size we get. That said, with it being a reef break that’s inconsistent and only suited for beginners, this isn’t going to be a world-class day. The swell direction from the ESE is a bit off from the optimum NE direction, so the waves won’t be perfect. The afternoon of the 26th is similar, with a 3ft swell and 118 energy, but the wind picks up to 22 mph, making it lumpy.
The other session to mention is the afternoon of Tuesday, August 25th. The swell is only 2ft, but the combined energy reads 107 (moderate wave energy), and the period stretches to 11 seconds. The problem is the wind is onshore from the E at 19 mph, so it’s going to be a messy, blown-out affair. For a surfer, that’s not a goer.
Honestly, if you’re desperate for a paddle, the morning of the 26th is your best bet, but keep your expectations low. The swell is small, the conditions are average, and the break is inconsistent. For the rest of the window, it’s a lot of flat, windy, or onshore junk. It’s a real quiet spell, but the forecast can always change.
Rusty.
Short Range ForecastHeavy rain (total 86mm), heaviest during Wed morning. Warm (max 30°C on Tue afternoon, min 25°C on Wed morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Fri afternoon. Warm (max 29°C on Sat morning, min 27°C on Fri afternoon). Wind will be generally light. | |||||||||||||||||||
Tue 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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 12 | E 6 | ENE 11 | ENE 11 | N 9 | N 8 | N 7 | N 7 | N 7 | N 6 | E 6 | E 6 | E 6 | E 6 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 72 | 18 | 40 | 23 | 37 | 42 | 26 | 25 | 15 | 7 | 12 | 34 | 26 | 30 | 33 | 19 | 19 | 20 | 20 | 47 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-off | off | glassy | glassy | off | cross-off | off | cross-off | cross-off | cross-off | cross-off | glassy | cross-on | cross-on | cross-on | cross-on | on | on |
High Tide | 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 | 9:22AM1.96m | 9:29PM2.06m | |||||||
Low Tide | 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 | 3:19AM0.60m | 3:21PM0.66m | ||||||||
 |  |  |  |  |  | | | | | | |  |  | | | | | | | |
 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — |
 | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:05 | — | — | 7:04 | — | — | 7:04 | — |
mm | 2 | 8 | 44 | 20 | — | — | 3 | 4 | 5 | 3 | — | — | — | — | — | — | 2 | 2 | — | — |
Temp °C | 30 | 28 | 26 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 29 | 29 | 27 | 29 | 29 | 28 | 29 | 29 | 28 |
Feels °C | 34 | 33 | 29 | 30 | 32 | 32 | 32 | 30 | 31 | 31 | 31 | 33 | 32 | 31 | 33 | 33 | 33 | 33 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 10 | S 9 | SW 9 | SW 8 | SW 9 | SW 8 | SW 8 | SSW 9 | SSW 8 | SSW 8 | SSW 9 | SSW 8 | SSW 8 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SSW 9 |
| kJ | 192 | 142 | 117 | 69 | 64 | 84 | 86 | 94 | 113 | 90 | 121 | 113 | 113 | 124 | 116 | 121 | 145 | 101 | 118 | 103 |
Swell 2 Height (m) Direction Period (s) | S 9 | SW 9 | S 9 | S 9 | S 8 | N 8 | N 7 | N 7 | N 7 | W 7 | WNW 5 | WNW 8 | W 7 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 11 |
| kJ | 140 | 101 | 78 | 56 | 50 | 42 | 26 | 25 | 15 | 25 | 17 | 20 | 15 | 20 | 33 | 19 | 19 | 20 | 20 | 47 |
Swell 3 Height (m) Direction Period (s) | E 12 | E 6 | ENE 11 | ENE 11 | N 9 | S 8 | S 8 | W 7 | W 6 | N 6 | W 6 | ENE 11 | ENE 11 | W 7 | W 7 | W 7 | W 8 | W 6 | W 7 | W 6 |
| kJ | 72 | 18 | 40 | 23 | 37 | 35 | 34 | 9 | 7 | 7 | 7 | 23 | 23 | 8 | 8 | 9 | 10 | 3 | 4 | 3 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | WNW 3 | — | — | — | E 6 | E 6 | E 6 | E 6 | ESE 6 | ESE 6 | ESE 5 | ESE 4 | ESE 4 | ESE 4 |
| kJ | — | — | — | — | — | — | 3 | — | — | — | 12 | 34 | 26 | 30 | 25 | 17 | 9 | 7 | 7 | 7 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 10 | 12 | 11 | 11 | 12 | 12 | 14 | 27 | 40 | 27 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 12 | 13 | 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.
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