Surf Forecasts:
Tengan surf forecast from 16 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 12AM (local time) - 6.5ft (2.0m), 9s period, ESE swell with 643 kJ wave energy.
Best Forecast Surf Conditions for Tengan this week:
The most powerful waves expected at Tengan in the next 16 days are 2.0m 9s and forecast to arrive on Thursday (Aug 20) at 12AM. 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 10s period and expected on Friday (Aug 21) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 12AM (Thu 20th Aug) | 6.5ft (2.0m) 9s |
Table - best surf conditions forecast for Tengan over the next 16 days.
The Lowdown
Alright, surf’s up… or it will be. Let’s be real with you: the next week and a half is gonna be a frustrating wait. We’ve got a heap of small, junky, wind-blown lumps on the cards for Tengan, and honestly, most of it ain't worth paddling out for. You’re looking at a run of days with onshore winds and weak, short-period junk, with the swell energy reading mostly in the weak-to-moderate range (28 to 76). The water’s sitting at 84°, which is about normal for this time of year. So, keep the board in the car and save your energy for what’s coming.
That first real glimmer of hope shows up on Monday the 24th. We finally see a bit of life as a clean, glassy morning rolls in with a touch of long-period ESE groundswell. It’s small, around 3ft, but the energy jumps to 392 and it's clean. The wind’s light, so it’ll be worth a look for a slow, gentle session, though it's not exactly going to be epic. The swell builds through the week, reaching a solid 4ft by Tuesday the 25th, with that clean cross-offshore breeze making things tidy.
Now, here’s where things get interesting. The standout window is Wednesday the 26th and into the following weekend. That ESE swell fills in strong, hitting 8ft to 8ft with a long 17-second period. The energy reading is through the roof—strong to very strong at 3025 to 3421. The wind is cross-offshore and clean, so Tengan’s reef is going to transform. This is the big one. The water’s still warm, and the conditions look excellent for experienced surfers. That 30th of August is looking particularly special: a glassy morning, 8ft of north-northeast swell with a 12-second period, and an energy reading of 1926. That’s the pick of the entire run, though the period is a bit shorter, so it might be a little more lined up than the long-period groundswell days.
The rest of that week is still good, but the swell eases off a touch. Friday the 28th holds clean 5ft to 6ft waves with a gentle cross-offshore breeze, and while the energy is strong, it's a step down from the peak. By Sunday, it's on the fade, but that one morning is the one you don’t want to miss.
So, there you have it. The wait is long, but the payoff is worth it. That window from the 26th to the 30th is the best on offer. Tengan (Tengan) is the spot, and it’s going to be worth the patience. The water’s warm, the winds are right, and there’s plenty of power in the ocean. Just keep an eye on those afternoon storms around the 27th, and remember, it’s a reef, so pick your line and respect the rock.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Tue night. Warm (max 29°C on Mon afternoon, min 27°C on Sun night). Winds increasing (light winds from the ESE on Sun morning, fresh winds from the E by Tue night). | Days 4-6 Weather SummaryHeavy rain (total 64mm), heaviest during Thu night. Warm (max 29°C on Fri morning, min 26°C on Wed morning). Winds decreasing (fresh winds from the SSE on Thu afternoon, light winds from the S by Fri night). | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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) | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | E 6 | E 6 | E 7 | E 8 | E 8 | ESE 9 | SE 10 | SE 10 | SSE 10 | S 9 | S 4 | E 10 | ESE 10 | ESE 10 | ESE 10 |
Wave Graph | |||||||||||||||||||||
20 | 20 | 19 | 20 | 19 | 19 | 35 | 72 | 138 | 305 | 235 | 643 | 569 | 461 | 0 | 0 | 10 | 7 | 18 | 10 | 10 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross | cross | cross | cross |
High Tide | 9:05PM2.12m | 9:22AM1.96m | 9:29PM2.06m | 10:05AM1.80m | 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 | ||||||||
Low Tide | 2:52PM0.48m | 3:19AM0.60m | 3:21PM0.66m | 3:57AM0.62m | 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 | ||||||||
6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | |
— | 7:04 | — | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | |
mm | — | — | — | — | — | — | 1 | — | 6 | 7 | 5 | 7 | 6 | 3 | 32 | 4 | — | — | — | — | — |
Temp °C | 28 | 28 | 27 | 28 | 29 | 27 | 28 | 28 | 28 | 27 | 28 | 27 | 27 | 27 | 27 | 29 | 29 | 28 | 30 | 30 | 28 |
Feels °C | 31 | 29 | 29 | 31 | 31 | 29 | 28 | 28 | 28 | 27 | 28 | 28 | 27 | 26 | 28 | 31 | 31 | 32 | 33 | 34 | 32 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 8 | SW 9 | SW 9 | SW 9 | SW 8 | SE 10 | SW 8 | SSE 10 | S 9 | S 9 | E 6 | S 9 | SSW 9 | SSW 8 |
70 | 69 | 62 | 61 | 59 | 59 | 36 | 35 | 19 | 12 | 12 | 11 | 569 | 11 | 373 | 392 | 287 | 6 | 235 | 189 | 118 | |
Swell 2 Height (m) Direction Period (s) | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | S 7 | SE 10 | S 8 | S 8 | SW 8 | SW 8 | N 6 | SW 9 | SW 9 | SW 9 | SW 9 | ESE 10 | SW 10 | SW 9 |
20 | 20 | 19 | 20 | 19 | 19 | 18 | 4 | 4 | 6 | 5 | 11 | 11 | 1 | 12 | 14 | 13 | 14 | 18 | 14 | 13 | |
Swell 3 Height (m) Direction Period (s) | S 9 | W 8 | W 7 | W 6 | SE 5 | ESE 10 | SSE 5 | SE 10 | SE 10 | — | S 8 | — | — | — | — | SW 9 | NE 8 | E 10 | WSW 9 | ESE 10 | ESE 10 |
14 | 5 | 8 | 3 | 4 | 11 | 3 | 4 | 4 | — | 5 | — | — | — | — | 14 | 3 | 7 | 8 | 10 | 10 | |
Wind waves Height (m) Direction Period (s) | ESE 4 | ESE 5 | ESE 4 | SE 5 | E 3 | E 4 | E 6 | E 6 | E 7 | E 8 | E 8 | ESE 9 | — | SE 10 | SSW 4 | — | S 4 | S 9 | S 9 | — | — |
8 | 9 | 8 | 12 | 1 | 10 | 35 | 72 | 138 | 305 | 235 | 643 | — | 461 | 16 | — | 10 | 276 | 398 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 12 | 13 | 13 | 12 | 13 | 13 | 12 | 1009 | 621 | 840 | 621 | 621 | 613 | 613 | 631 | 636 | 613 | 13 | 13 | 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.











