Surf Forecasts:
Tengan surf forecast from 18 Aug 2026:
- Most powerful swell: Tuesday 25 Aug, 3PM (local time) - 5ft (1.6m), 16s period, ESE swell with 1,286 kJ wave energy.
Best Forecast Surf Conditions for Tengan this week:
The most powerful waves expected at Tengan in the next 16 days are 1.6m 16s and forecast to arrive on Tuesday (Aug 25) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 6s period and expected on Friday (Aug 21) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3PM (Tue 25th Aug) | 5ft (1.6m) 16s |
Table - best surf conditions forecast for Tengan over the next 16 days.
The Lowdown
Alright, Rusty here again, breakin' it down for the Tengan area with numbers for the imperial-minded.
First week is a total dud. From Tuesday the 18th through Sunday the 23rd of August, onshore winds out of the east and southeast at 12–19 mph keep everything chopped and sloppy. Swell is tiny, short-period, and weak. Combined wave energy is mostly under 100 (weak) or in the low hundreds—but with that wind, it doesn’t matter. You won’t want a bar of it. There’s a big gap of poor surf right at the start.
Things start to change around Monday the 24th. A long-period groundswell rolls in (14–17 seconds), but it’s still onshore. Combined energy picks up to moderate (190–352). Still not clean, but a sign of life.
The true standout arrives around a week out. The best days are Monday the 31st of August and Tuesday the 1st of September. Tengan (reef) is the spot. On the 31st, look for a massive east-northeast swell at 21–23 feet, with a period of 13–14 seconds. Wind goes dead calm or glassy, 0–3 mph. That’s as clean as it gets. Combined energy is huge, way over 15,000—very strong, expert-only territory. This swell direction lines up perfectly with the break’s optimum. Crowds are listed as “sometimes,” so expect a few other die-hards.
Before that, from the 27th to the 30th of August, you’ve got solid east swell (5–8 feet), with clean cross-offshore winds from the north. Combined wave energy is strong (1,000–3,500+). The 30th of August morning is excellent for experienced surfers, clean and light. That whole stretch is the build-up to the big event.
Water temp is 29° / 84°F, pretty much bang on average for the season.
First week, forget it. The last few days of August and first of September—that’s where the magic is. Keep your eyes on Monday the 31st.
Rusty, out.
Short Range ForecastHeavy rain (total 34mm), heaviest during Thu night. Warm (max 28°C on Tue morning, min 26°C on Thu morning). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 59mm), heaviest during Fri night. Warm (max 28°C on Sun morning, min 26°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 6 | E 6 | E 6 | E 7 | E 7 | ESE 8 | SE 8 | SSE 8 | SE 8 | ENE 8 | ENE 8 | E 11 | ESE 6 | SSE 6 | SSE 5 | SE 5 | SSE 5 | ESE 16 | ESE 14 | ESE 17 | ESE 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 58 | 73 | 77 | 154 | 208 | 398 | 439 | 0 | 338 | 20 | 12 | 9 | 11 | 119 | 93 | 38 | 39 | 49 | 163 | 243 | 751 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | cross-on | cross-on | cross | cross | cross-on | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-on | on | on | on |
High Tide | 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 | 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 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — |
mm | — | — | 1 | 3 | 6 | 9 | 4 | — | 11 | 12 | 9 | 23 | 7 | 6 | 2 | — | — | — | — | — | — |
Temp °C | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 28 | 27 | 26 | 26 | 26 | 26 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 26 |
Feels °C | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 30 | 30 | 28 | 29 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 9 | SW 9 | SW 9 | SW 8 | S 9 | SW 9 | S 10 | SW 9 | SW 10 | SW 10 | E 11 | ESE 6 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SSW 9 | ESE 17 | ESE 16 |
| kJ | 35 | 36 | 36 | 19 | 11 | 13 | 12 | 18 | 12 | 25 | 33 | 9 | 11 | 365 | 357 | 415 | 353 | 237 | 254 | 243 | 751 |
Swell 2 Height (m) Direction Period (s) | ENE 10 | ENE 9 | ENE 9 | S 7 | S 8 | SW 8 | SW 9 | SW 9 | WSW 9 | ENE 8 | ENE 8 | E 9 | ESE 10 | E 14 | E 9 | ESE 10 | E 9 | ESE 16 | ESE 14 | ESE 13 | SSW 8 |
| kJ | 18 | 8 | 8 | 4 | 5 | 11 | 3 | 13 | 7 | 20 | 12 | 2 | 10 | 4 | 6 | 10 | 7 | 49 | 163 | 99 | 90 |
Swell 3 Height (m) Direction Period (s) | S 7 | S 7 | SE 10 | SE 10 | — | S 10 | — | — | SW 9 | — | — | E 14 | SE 10 | — | E 13 | E 9 | E 18 | E 10 | ENE 10 | ENE 10 | ENE 10 |
| kJ | 4 | 4 | 4 | 4 | — | 2 | — | — | 12 | — | — | 4 | 4 | — | 3 | 7 | 6 | 7 | 10 | 10 | 9 |
Wind waves Height (m) Direction Period (s) | E 6 | E 6 | E 6 | E 7 | E 7 | ESE 8 | SE 8 | SSE 8 | SE 8 | SSE 6 | SSE 7 | S 8 | SSW 10 | SSE 6 | SSE 5 | SE 5 | SSE 5 | SE 4 | ESE 5 | S 9 | E 5 |
| kJ | 58 | 73 | 77 | 154 | 208 | 398 | 439 | 383 | 338 | 351 | 408 | 450 | 470 | 119 | 93 | 38 | 39 | 21 | 17 | 181 | 14 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 12 | 12 | 13 | 647 | 1009 | 613 | 13 | 613 | 613 | 613 | 13 | 613 | 647 | 840 | 613 | 647 | 13 | 13 | 13 | 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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