Surf Forecasts:
Tainohama surf forecast from 15 Aug 2026:
- Best quality surf: Thursday 20 Aug, 6AM (local time) - 2.5ft (0.7m), 7s period, E swell with glassy winds.
- Most powerful swell: Friday 21 Aug, 6AM (local time) - 4.5ft (1.4m), 11s period, S swell with 467 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 6AM (local time) - 2.5ft (0.7m), 7s period with E swell.
Best Forecast Surf Conditions for Tainohama this week:
The surf forecast for Tainohama over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 6AM. The primary swell is predicted to be 0.7m and 7s period with a secondary swell of 0.5m and 7s. Another secondary swell of 0.4m and 10s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Tainohama in the next 16 days are 1.4m 11s and forecast to arrive on Friday (Aug 21) at 6AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 20th Aug) | 2.5ft (0.7m) 7s |
| Best Surf | 6AM (Thu 20th Aug) | 2.5ft (0.7m) 7s |
| Most Powerful | 6AM (Fri 21st Aug) | 4.5ft (1.4m) 11s |
Table - best surf conditions forecast for Tainohama over the next 16 days.
The Lowdown
Alright, let’s get into it.
Right now, we’re looking at a pretty bleak start here for Tainohama. For the first few days, it’s a write-off. Sunday the 16th through to Thursday the 20th is all onshore wind and small, weak swell, with no real surf to speak of. The combined swell energy barely gets past the mid-100s through most of that stretch, so it’s just not worth paddling out.
Things start to look a little more interesting on Friday the 21st. We’ve got a bump in swell coming from the south, running at 5ft with an 11-second period. The energy jumps up to 548. But the wind is still on it, so it’s only marginal. Don’t get too excited.
Then from Saturday the 22nd right through to Sunday the 23rd, it goes back to being poor. Onshore and weak.
Now, Monday the 24th shows a bit more size – swell from the southeast at 6ft to 7ft, with a long 16-second period. That’s a nice groundswell. But it’s still onshore wind, so it’s messy and only a marginal call, with moderate wave energy on the rise (1802 to 1989). Not the day for it.
But here’s where it gets real.
The standout window is Tuesday the 25th. That’s the one to circle. The morning starts glassy – wind from the east-northeast at just 3 mph – and the swell is a solid 8ft from the southeast with a very long 16-second period. The water’s already warm at 83°, which is about average for this time of year. This is a big, clean groundswell. For experienced surfers, this is excellent. The combined energy is massive – over 3100. Just be aware, a 16-second period at a beach can make it a little straight, so it’ll be better if you can find a corner or a reef, but Tainohama’s a reef break anyway, so it should handle that nicely. Crowds are possible here sometimes, so get in early.
Wednesday the 26th holds similar size, but the wind gets a bit cross, so it’s not as clean. Still decent for those who know what they’re doing.
Thursday the 27th is the big one. Morning shows an 12ft swell from the southeast with a 16-second period, and the wind is cross-offshore from the north-northeast at 9 mph. That’s clean. The energy is through the roof at 5343 to 6769. This is an exceptional day for expert surfers only. Too big for anyone else. The afternoon holds even better.
Friday the 28th gets blown out by a strong cross-onshore wind and a massive 13ft to 15ft swell. That’s a mess, and the energy is huge, but not rideable for paddle surfing.
Saturday the 29th is just mental. Swell hits 25ft in the morning, with near gale-force onshore wind. That’s not surfable – it’s more like a survival mission. Even the afternoon has 21ft. Leave it for the kites if anyone’s mad enough.
Sunday the 30th cleans up with a cross-offshore wind, but the swell drops to 10ft with a short 9-second period. Marginal call.
Monday the 31st is the last chance in this window. You get a clean offshore wind from the north, with a 7ft swell from the southeast, but the period drops to 7 or 8 seconds. Still fun for a wave, but it’s not the same power as the middle of the week.
So, to sum it up: Tuesday the 25th is your standout for clean, powerful, glassy conditions for experienced surfers. Thursday the 27th is the expert-only big-wave day with exceptional-quality surf. The rest of the window is either onshore junk or way too big. Get on it while it’s clean.
Rusty.
Short Range ForecastHeavy rain (total 23mm), heaviest during Sun morning. Warm (max 28°C on Mon morning, min 25°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Fri night. Warm (max 28°C on Wed afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
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) | ESE 5 | ESE 6 | ESE 6 | SE 5 | SE 11 | SE 11 | ESE 8 | ESE 9 | ESE 8 | ESE 8 | ESE 8 | SE 10 | E 7 | S 9 | S 9 | S 11 | S 11 | SSW 10 | SSW 10 | SSW 10 | SSW 10 |
Wave Graph | |||||||||||||||||||||
111 | 164 | 108 | 45 | 30 | 30 | 45 | 65 | 61 | 59 | 50 | 25 | 52 | 80 | 201 | 466 | 441 | 306 | 209 | 209 | 132 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | on | on | on | on | on | cross-on | on | on | on | on | on | on | on | cross-on | on |
High Tide | 7:52PM1.91m | 8:05AM1.88m | 8:18PM1.88m | 8:47AM1.76m | 8:45PM1.83m | 9:37AM1.62m | 9:13PM1.77m | 10:45AM1.47m | 9:48PM1.69m | 12:49PM1.39m | 10:41PM1.61m | 3:26PM1.47m | 00:26AM1.55m | ||||||||
Low Tide | 1:41PM0.46m | 1:58AM0.57m | 2:11PM0.61m | 2:35AM0.56m | 2:40PM0.78m | 3:17AM0.58m | 3:10PM0.96m | 4:09AM0.63m | 3:44PM1.13m | 5:20AM0.68m | 4:37PM1.30m | 7:01AM0.68m | 7:27PM1.39m | ||||||||
5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | |
— | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | |
mm | 10 | 5 | 3 | 1 | — | 3 | 1 | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — | 4 |
Temp °C | 26 | 27 | 26 | 28 | 28 | 26 | 27 | 28 | 26 | 27 | 28 | 25 | 28 | 28 | 26 | 28 | 28 | 26 | 28 | 29 | 26 |
Feels °C | 28 | 28 | 28 | 30 | 30 | 29 | 30 | 30 | 29 | 31 | 30 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 31 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 9 | S 8 | S 8 | SSW 8 | SSW 8 | ESE 8 | SE 10 | ESE 8 | ESE 8 | ESE 8 | ESE 5 | ESE 7 | S 9 | S 9 | S 11 | S 11 | SSW 10 | SSW 10 | SSW 10 | SSW 10 |
51 | 39 | 35 | 33 | 21 | 20 | 45 | 28 | 61 | 59 | 50 | 15 | 29 | 80 | 201 | 466 | 441 | 306 | 209 | 209 | 132 | |
Swell 2 Height (m) Direction Period (s) | SE 12 | ESE 10 | ESE 10 | SE 11 | SE 11 | SE 11 | SSW 8 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 5 | SE 11 | SE 11 | ESE 4 | ESE 9 | ESE 10 | ESE 7 |
48 | 35 | 31 | 42 | 30 | 30 | 19 | 11 | 27 | 26 | 25 | 25 | 25 | 25 | 13 | 29 | 29 | 6 | 25 | 58 | 21 | |
Swell 3 Height (m) Direction Period (s) | SE 18 | SE 11 | SE 11 | ESE 9 | ESE 9 | — | SE 11 | S 10 | SSW 8 | SSW 8 | SSW 8 | ESE 8 | S 10 | E 7 | SE 10 | ESE 9 | E 9 | SE 10 | SE 10 | ESE 13 | ESE 10 |
12 | 45 | 43 | 28 | 16 | — | 29 | 2 | 11 | 11 | 11 | 11 | 17 | 4 | 28 | 16 | 14 | 28 | 28 | 17 | 10 | |
Wind waves Height (m) Direction Period (s) | ESE 5 | ESE 6 | ESE 6 | SE 5 | SE 5 | SE 5 | — | ESE 9 | ESE 4 | — | SE 4 | — | E 7 | ESE 5 | — | E 9 | E 9 | — | ESE 3 | — | — |
111 | 164 | 108 | 45 | 29 | 23 | — | 65 | 10 | — | 10 | — | 52 | 15 | — | 37 | 73 | — | 2 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 64 | 454 | 64 | 64 | 454 | 21 | 64 | 32 | 21 | 3 | 500 | 18 | 64 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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Information about the Tainohama Surf forecast
The above surf forecast table for Tainohama provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Tainohama can be found by selecting the local surf guide option on the grey menu. Our Tainohama 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 (Tainohama) 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 Tainohama 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.
Tainohama is 21 km (13 miles) from Anan. If you plan a holiday in Shikoku, look for hotels and other accommodation in Anan. Anan has rooms for a wide range of budgets as well as car hire and transport links.











