Surf Forecasts:
Tengan surf forecast from 12 Aug 2026:
- Most powerful swell: Thursday 20 Aug, 9AM (local time) - 5ft (1.5m), 9s period, ESE swell with 343 kJ wave energy.
Best Forecast Surf Conditions for Tengan this week:
The most powerful waves expected at Tengan in the next 16 days are 1.5m 9s and forecast to arrive on Thursday (Aug 20) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 8s period and expected on Friday (Aug 14) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9AM (Thu 20th Aug) | 5ft (1.5m) 9s |
Table - best surf conditions forecast for Tengan over the next 16 days.
The Lowdown
Alright folks, it’s Rusty here. Let’s be straight with you—this stretch at Tengan is looking pretty grim for a while. The first couple of weeks are mostly a write-off, but there’s a glimmer of hope right at the end of the 16-day window.
Right now, and for the next several days, the swell is tiny and the energy is weak. We’re looking at ankle-to-knee-high waves from the north, with combined energy readings barely hitting 28 on Thursday morning. It’s glassy, which is nice, but there’s just nothing to ride. This flat spell stretches on with no real surf to speak of through the 13th, 14th, 15th, and 16th of August. The swell stays small, and the wind, while light, doesn’t help.
By the 17th and 18th, the wind swings onshore and the swell gets a little bump, but it’s short-period, messy, and still poor. The 20th of August sees a bigger bump in swell—around 5 ft to 6 ft from the ESE (345 to 584 combined energy)—but it’s blowing a fresh 22 mph cross-onshore wind, making it lumpy and unrideable. That one’s more for the kite crew than paddlers.
The real standout comes at the very end of the forecast. On Tuesday, the 25th of August, we finally see something worth waking up for. The morning starts calm with glassy conditions and a 2 ft east swell at a long 12-second period (208 energy). It’s small but clean. The afternoon is the pick of the whole run: 3 ft east swell, 15-second period, combined energy of 374, and glassy, offshore wind. That’s a beautiful window of clean, long-period groundswell. Tengan is a reef break, so this long-period energy will wrap in nicely, offering some proper shape. The water temp is sitting at 84°, which is about average for this time of year.
Then Wednesday the 26th holds some small, clean waves but with a light cross-onshore wind—still rideable for the patient. Thursday the 27th and Friday the 28th of August bring offshore winds and chest-high waves from the east and ENE, with periods holding around 13-14 seconds and energy jumping back up to 350-429. That Friday afternoon is looking real sweet: 3 ft, glassy, clean.
So, if you’re holding out, the last few days of August are your best bet. The 25th afternoon and the 28th are the two true standouts—clean, glassy, proper groundswell. Just don’t expect much before then.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Fri afternoon. Warm (max 29°C on Thu afternoon, min 27°C on Thu morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Sun night. Warm (max 29°C on Sun morning, min 27°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | N 8 | N 7 | N 7 | N 7 | N 6 | SW 9 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ESE 5 | ESE 5 | ESE 5 | ENE 10 | E 5 | E 6 | E 10 | ENE 10 | ESE 5 |
Wave Graph | |||||||||||||||||||||
28 | 15 | 8 | 16 | 7 | 0 | 23 | 23 | 20 | 20 | 20 | 20 | 37 | 31 | 30 | 23 | 42 | 22 | 49 | 81 | 36 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | glassy | glassy | off | cross | glassy | glassy | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | on | cross-on |
High Tide | 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 | 10:05AM1.80m | 9:55PM1.99m | 10:54AM1.63m | 10:22PM1.90m | ||||||||
Low Tide | 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 | 3:57AM0.62m | 3:48PM0.85m | 4:38AM0.67m | 4:16PM1.03m | ||||||||
5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | |
— | 7:07 | — | — | 7:06 | — | — | 7:05 | — | — | 7:04 | — | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — | |
mm | — | — | — | — | 1 | 1 | — | — | — | — | — | 4 | 3 | 1 | — | — | — | — | — | — | 1 |
Temp °C | 28 | 29 | 28 | 29 | 29 | 27 | 29 | 29 | 28 | 29 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 29 | 29 | 28 |
Feels °C | 33 | 35 | 34 | 34 | 33 | 31 | 34 | 34 | 33 | 32 | 32 | 30 | 31 | 29 | 29 | 29 | 29 | 28 | 32 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 9 | SSW 8 | SW 8 | SW 9 | SW 8 | SW 8 | SSW 9 | SSW 8 | SSW 8 | SSW 9 | SSW 9 | SSW 9 | SW 9 | SW 9 | SSW 9 | E 6 | E 10 | S 8 | NNE 6 |
66 | 84 | 59 | 103 | 54 | 50 | 42 | 62 | 116 | 92 | 92 | 141 | 99 | 106 | 83 | 81 | 68 | 22 | 49 | 19 | 16 | |
Swell 2 Height (m) Direction Period (s) | S 9 | S 8 | S 8 | N 7 | S 9 | S 8 | S 8 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | SE 10 | SSW 9 | SW 9 | SW 9 | ESE 9 |
53 | 33 | 20 | 16 | 38 | 22 | 35 | 23 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 18 | 4 | 52 | 28 | 21 | 28 | |
Swell 3 Height (m) Direction Period (s) | N 8 | N 7 | N 7 | ENE 10 | N 6 | W 6 | ENE 11 | SSE 8 | W 6 | E 5 | SE 11 | SE 11 | SE 11 | SE 10 | SE 10 | ESE 10 | W 5 | ENE 10 | SSW 8 | ESE 10 | SSW 9 |
28 | 15 | 8 | 10 | 7 | 7 | 23 | 7 | 2 | 2 | 5 | 5 | 4 | 4 | 4 | 11 | 1 | 19 | 14 | 19 | 26 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | ESE 4 | — | ESE 5 | ESE 5 | ESE 5 | ESE 5 | ESE 5 | ESE 5 | E 5 | — | — | ENE 10 | ESE 5 |
— | — | — | — | — | — | — | — | 2 | — | 5 | 15 | 37 | 31 | 30 | 23 | 42 | — | — | 81 | 36 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 12 | 14 | 12 | 12 | 27 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 12 | 13 | 12 | 12 | 12 | 633 |
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.











