Surf Forecasts:
Tengan surf forecast from 23 Aug 2026:
- Most powerful swell: Wednesday 26 Aug, 3AM (local time) - 21ft (6.5m), 10s period, NW swell with 7,787 kJ wave energy.
Best Forecast Surf Conditions for Tengan this week:
The most powerful waves expected at Tengan in the next 16 days are 6.5m 10s and forecast to arrive on Wednesday (Aug 26) at 3AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 6.0m 10s period and expected on Wednesday (Aug 26) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3AM (Wed 26th Aug) | 21ft (6.5m) 10s |
Table - best surf conditions forecast for Tengan over the next 16 days.
The Lowdown
Alright, Rusty here, let’s look at what Tengan (reef) has on offer.
Honestly, it’s a pretty bleak run for most of the next couple of weeks. Most days are marked by poor conditions, and for the first week or so there's really nothing to get excited about. The forecast starts with very small swell and messy cross-onshore wind through the 23rd and 24th. On Sunday the 25th there’s a quick building of swell, hitting about 10 ft from the ESE on Tuesday morning with a moderate 17-second period, and the combined swell energy reading is very strong at 6070 (moderate). But the wind is a fresh cross-shore from the north, making it lumpy and messy. That wave energy is solid, but the conditions are real average – that's more for the seasoned local who knows the reef and doesn’t mind a chop.
A huge weather system pushes through around the 26th with gale-force winds and a severe gale, making Wednesday thoroughly dangerous. That swell spikes to about 12 ft from the NW, but with a short 10-second period. For a reef like Tengan, it's just too much and too dangerous. That carries on through the end of the month.
The only real standout that peeks through the gloom comes right at the end of the forecast window. On Friday the 4th of September, the wind finally clocks around to the west, giving us some proper offshore conditions in the morning (WSW 25 mph, strong offshore). Swell sits at about 8 ft from the north with a 10-second period (moderate energy reading of 1628). It’s still marginal, but this is the best chance for a wave because the clean offshore wind will groom the surface nicely on the reef. Still, 8 ft is expert territory, so this is not for beginners. The following Saturday the 5th looks okay too, with 8 ft to 7 ft from the north and cleaner cross-offshore breezes. Combined energy stays moderate to strong, but the crowds at Tengan are sometimes an issue, so you may have plenty of company if you paddle out.
Water temperature is 84°, running pretty much average for late August – no surprises there.
So, if you’re a confident barrel chaser, the real window is Friday the 4th onward, with the cleanest, biggest surf of the period. Until then, it's long flat spells and rough conditions. Hang in there – the reef will turn on eventually.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest 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 night, severe gales from the W by Tue night). | Days 4-6 Weather SummaryHeavy rain (total 24mm), heaviest during Wed morning. Warm (max 29°C on Thu morning, min 27°C on Wed morning). Winds decreasing (gales from the WSW on Wed morning, light winds from the SE by Fri afternoon). | ||||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | |||||||||||||||
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 | SSE 4 | ESE 12 | ESE 16 | ESE 17 | ESE 18 | ESE 17 | E 16 | N 10 | NW 10 | E 10 | E 9 | E 13 | E 8 | E 9 | E 10 | E 8 | E 10 | ESE 8 | ESE 8 | ESE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 37 | 24 | 30 | 220 | 333 | 2830 | 5996 | 5592 | 4606 | 2838 | 96 | 78 | 13 | 50 | 76 | 98 | 29 | 66 | 75 | 81 | 135 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on |
High Tide | 5:20PM1.67m | 3:33AM1.68m | 5:47PM1.78m | 4:32AM1.81m | 6:10PM1.88m | 5:13AM1.94m | 6:32PM1.97m | 5:49AM2.06m | 6:54PM2.05m | 6:24AM2.15m | 7:16PM2.11m | 6:59AM2.19m | 7:39PM2.15m | ||||||||
Low Tide | 10:03AM0.76m | 10:24PM1.33m | 10:55AM0.64m | 11:07PM1.21m | 11:31AM0.52m | 11:38PM1.07m | 12:00PM0.41m | 00:07AM0.94m | 12:28PM0.33m | 00:36AM0.80m | 12:54PM0.29m | 1:06AM0.68m | 1:22PM0.30m | 1:38AM0.57m | |||||||
 | |  |  | | | |  |  |  | | | | |  | | | | | | | |
 | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — |
 | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — |
mm | — | — | — | 2 | — | — | — | — | 11 | 8 | 5 | 7 | 2 | 1 | — | — | 1 | — | — | 2 | — |
Temp °C | 28 | 28 | 27 | 28 | 29 | 27 | 29 | 29 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 28 | 28 |
Feels °C | 30 | 29 | 29 | 30 | 31 | 29 | 29 | 28 | 22 | 23 | 25 | 26 | 27 | 29 | 29 | 32 | 32 | 31 | 31 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 10 | SSW 10 | SW 9 | SW 9 | ESE 14 | ESE 18 | ESE 17 | E 16 | ENE 14 | NW 10 | W 10 | E 9 | SW 12 | SW 12 | SW 12 | SSW 11 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SW 11 |
| kJ | 457 | 363 | 162 | 114 | 236 | 2830 | 5996 | 5592 | 3224 | 2838 | 3493 | 78 | 2647 | 3359 | 2402 | 1362 | 1375 | 943 | 700 | 533 | 287 |
Swell 2 Height (m) Direction Period (s) | E 14 | ESE 13 | ESE 12 | ESE 16 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | NNE 11 | E 10 | E 13 | E 13 | S 10 | E 16 | E 10 | E 8 | E 10 | ENE 13 | ENE 13 | S 10 |
| kJ | 37 | 17 | 30 | 220 | 122 | 95 | 50 | 27 | 20 | 634 | 96 | 14 | 13 | 48 | 5 | 98 | 29 | 66 | 17 | 17 | 115 |
Swell 3 Height (m) Direction Period (s) | SE 10 | E 9 | E 10 | SE 9 | ESE 17 | ENE 10 | — | — | SW 9 | E 11 | E 14 | NE 8 | E 18 | E 18 | SE 10 | ESE 10 | E 15 | E 14 | ENE 13 | ENE 13 | ENE 12 |
| kJ | 4 | 6 | 7 | 3 | 333 | 19 | — | — | 37 | 125 | 35 | 2 | 6 | 6 | 4 | 10 | 17 | 14 | 35 | 34 | 15 |
Wind waves Height (m) Direction Period (s) | SSE 7 | SSE 4 | E 4 | E 11 | E 4 | ENE 7 | NNE 5 | NNE 6 | N 10 | WSW 9 | SSW 9 | SW 10 | SSE 9 | E 8 | E 9 | E 8 | SSW 11 | SE 4 | ESE 8 | ESE 8 | ESE 8 |
| kJ | 73 | 24 | 9 | 85 | 20 | 73 | 74 | 374 | 4606 | 4373 | 1694 | 2262 | 608 | 50 | 76 | 60 | 1230 | 16 | 75 | 81 | 135 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 13 | 13 | 13 | 13 | 13 | 12 | 37 | 745 | 621 | 621 | 737 | 737 | 737 | 737 | 28 | 10 | 28 | 10 | 10 | 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.
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