Surf Forecasts:
Tengan surf forecast from 20 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 12AM (local time) - 5ft (1.6m), 14s period, E swell with glassy winds.
- Most powerful swell: Monday 24 Aug, 3PM (local time) - 10ft (3.0m), 18s period, ESE swell with 4,786 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 12AM (local time) - 5ft (1.6m), 14s period with E swell.
Best Forecast Surf Conditions for Tengan this week:
The surf forecast for Tengan over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 26) at 12AM. The primary swell is predicted to be 1.6m and 14s period with a secondary swell of 1.1m and 6s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Tengan in the next 16 days are 3.0m 18s and forecast to arrive on Monday (Aug 24) at 3PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 10s period and expected on Friday (Aug 21) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 26th Aug) | 5ft (1.6m) 14s |
| Best Surf | 12AM (Wed 26th Aug) | 5ft (1.6m) 14s |
| Most Powerful | 3PM (Mon 24th Aug) | 10ft (3.0m) 18s |
Table - best surf conditions forecast for Tengan over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s on the cards for the Tengan (reef) stretch.
Honestly, it’s a pretty grim outlook for the next couple of weeks. The pattern is messy and blown-out almost right through, with only a couple of windows that might give you a marginal wave if you’re desperate. The first solid swell pulses arrive around the weekend of the 24th, but the wind is a nightmare – howling onshore or cross-onshore with thunderstorms lurking, turning even a decent 10 ft swell into a washing machine.
The water temperature is sitting at a toasty 84°F which is just about average for this time of year, so at least you won’t be cold while you’re getting worked.
The end of the first week and into the second week sees a shift in wind direction, but the quality remains poor. A big 10 ft swell with a very long 18-second period rolls in on Monday the 24th afternoon, but the wind is still a fresh onshore breeze, and the combined energy is pumping at 4786 – that’s a strong, powerful groundswell. That kind of period at a reef break like Tengan could produce some heavy lines, but with the wind ruining the face, it’s for experts only, and even then, it’s a battle. The following Tuesday morning the 25th still has a solid 8 ft swell from the east with a long 16-second period, and winds drop to a moderate onshore – you get a marginal score of 1, but it’s not good.
Late in the run, around Thursday 4th September, the swell drops right away to tiny 2 ft, but the wind goes clean cross-offshore from the NNW. Even with a gale blowing 44 mph, it’s clean. That’s a strong wind, though, and with such weak energy (212), it’s really more of a novelty – better suited for a kite than a paddleboard. Tengan is inconsistent and only for beginners on a good day, but this is not a good day.
For the whole 16 days, there are no standouts. The forecast is full of strong winds, stormy conditions, and poor surf quality. If you’re really determined, maybe the Tuesday morning of the 25th offers a glimmer, but be prepared for a tough paddle into a strong onshore wind. It’s bleak, but it won’t stay poor forever – forecasts change.
Rusty.
Short Range ForecastHeavy rain (total 21mm), heaviest during Thu night. Warm (max 28°C on Thu afternoon, min 27°C on Thu afternoon). Winds increasing (moderate winds from the SE on Thu afternoon, strong winds from the SE by Fri afternoon). | Days 5-7 Weather SummaryModerate rain (total 12mm), heaviest on Mon night. Warm (max 29°C on Tue morning, min 27°C on Sun afternoon). Winds decreasing (fresh winds from the ESE on Sun afternoon, calm by Tue night). | |||||||||||||||||||
Thu 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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) | ESE 7 | ESE 7 | ESE 6 | SE 8 | SSE 10 | SE 10 | SSE 9 | E 16 | ESE 6 | ESE 6 | SE 7 | ESE 9 | ESE 18 | ESE 18 | E 16 | E 15 | E 14 | ENE 13 | ENE 13 | NE 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 91 | 77 | 72 | 1107 | 0 | 1662 | 0 | 5 | 182 | 140 | 540 | 1107 | 4786 | 2552 | 3006 | 2168 | 946 | 539 | 336 | 69 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | on | glassy | cross-on | cross | cross-off |
High Tide | 10:56PM1.79m | 2:22PM1.43m | 11:51PM1.67m | 4:38PM1.54m | 1:49AM1.61m | 5:20PM1.67m | 3:33AM1.68m | 5:47PM1.78m | 4:32AM1.81m | 6:10PM1.88m | 5:13AM1.94m | 6:32PM1.97m | ||||||||
Low Tide | 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 | 11:31AM0.52m | 11:38PM1.07m | 12:00PM0.41m | 00:07AM0.94m | |||||||
 |  | | | | | | | | | | | | |  | |  |  | | | |
 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — |
 | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — |
mm | 2 | 3 | 3 | 1 | 2 | 2 | 3 | 3 | 2 | 1 | 3 | 2 | 1 | 3 | — | 2 | — | — | — | — |
Temp °C | 28 | 27 | 27 | 27 | 27 | 28 | 27 | 27 | 28 | 28 | 27 | 27 | 28 | 27 | 29 | 29 | 27 | 29 | 29 | 27 |
Feels °C | 30 | 29 | 25 | 24 | 24 | 25 | 25 | 26 | 27 | 28 | 27 | 27 | 28 | 27 | 31 | 32 | 32 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 9 | S 8 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | S 10 | S 10 | W 8 | SSW 10 | SSW 10 | ESE 18 | E 16 | E 15 | E 14 | ENE 13 | ENE 13 | SSW 10 |
| kJ | 78 | 99 | 66 | 87 | 108 | 110 | 115 | 129 | 443 | 620 | 1 | 65 | 67 | 2552 | 3006 | 2168 | 946 | 539 | 336 | 210 |
Swell 2 Height (m) Direction Period (s) | SW 9 | SW 9 | SW 8 | — | — | — | — | E 9 | SW 10 | SW 9 | ENE 13 | — | — | SSW 10 | S 9 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | NNW 6 |
| kJ | 13 | 13 | 57 | — | — | — | — | 2 | 79 | 31 | 17 | — | — | 143 | 164 | 117 | 209 | 209 | 148 | 52 |
Swell 3 Height (m) Direction Period (s) | ENE 8 | SE 10 | SE 10 | — | — | — | — | E 16 | ESE 14 | ESE 13 | — | — | — | SSW 10 | — | S 11 | SE 10 | SE 10 | S 10 | NE 12 |
| kJ | 28 | 4 | 4 | — | — | — | — | 5 | 20 | 17 | — | — | — | 111 | — | 110 | 16 | 17 | 71 | 69 |
Wind waves Height (m) Direction Period (s) | ESE 7 | ESE 7 | ESE 6 | SE 8 | SSE 10 | SE 10 | SSE 9 | SSE 9 | ESE 6 | ESE 6 | SE 7 | ESE 9 | ESE 18 | ESE 8 | ENE 10 | NNE 5 | NNE 6 | N 6 | NNW 5 | — |
| kJ | 91 | 77 | 72 | 1107 | 1855 | 1662 | 865 | 402 | 182 | 140 | 540 | 1107 | 4786 | 306 | 10 | 9 | 91 | 46 | 37 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 13 | 13 | 613 | 613 | 613 | 613 | 621 | 613 | 647 | 840 | 647 | 737 | 772 | 13 | 12 | 12 | 0 | 12 | 13 | 0 |
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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