Surf Forecasts:
Asakawa surf forecast from 7 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 9AM (local time) - 8ft (2.5m), 8s period, SSE swell with glassy winds.
- Most powerful swell: Wednesday 9 Sep, 12PM (local time) - 10ft (3.0m), 8s period, SSE swell with 1,134 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 9PM (local time) - 5ft (1.6m), 9s period with SE swell.
Best Forecast Surf Conditions for Asakawa this week:
The surf forecast for Asakawa over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 07) at 9PM. The primary swell is predicted to be 1.6m and 9s period with a secondary swell of 0.8m and 11s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 3.0m 8s and forecast to arrive on Wednesday (Sep 09) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Thursday (Sep 10) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 7th Sep) | 5ft (1.6m) 9s |
| Best Surf | 9AM (Wed 9th Sep) | 8ft (2.5m) 8s |
| Most Powerful | 12PM (Wed 9th Sep) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cooking for Asakawa over the next couple of weeks.
We’ve got a bit of a slow start, but the real story is a late-blooming bomb that’s going to make the second week very interesting. For now, patience is the name of the game.
The first decent window opens up on Monday the 7th of September. We’re looking at a 6ft swell rolling in from the SE with a 9-second period. The water is sitting at 83°, which is a touch warmer than normal for this time of year. The wind is a light cross-off from the NNE, keeping the surface clean. It’s not firing on all cylinders, but it’s a solid start to the week.
Tuesday the 8th keeps things ticking over, with a similar 5ft swell from the S and light winds, keeping the shape clean. Nothing special, but you won’t be sitting on the beach twiddling your thumbs.
Now, Wednesday the 9th is where things get interesting. The swell jumps up to 8ft from the SSE with a short 8-second period. The energy is strong, with a reading of 1744. The wind is glassy, dead calm. This is clean, powerful, and a bit punchy. It’s going to be a standout for the first week, but the size and short period make it one for experienced surfers only. If you’re intermediate, be careful.
After that, the surf drops right off. From Thursday the 10th right through to the middle of the following week, it’s a pretty flat spell. We’re looking at waist-high chop or less, with junk wind and onshore slop. There’s a gap of about a week with nothing worth paddling out for.
We start to see a pulse of life again on Monday the 14th of September, with a small 4ft swell from the SE, but the wind is questionable. It’s not until the 20th of September that things start to look promising again. We get a clean 5ft swell from the ESE with a 10-second period, and a light offshore wind on the Sunday morning. The energy is moderate at 402. This is a solid, clean day.
But the real headline is Monday the 22nd of September. Hold onto your board. We’ve got a massive 15ft swell from the ESE, with a very long period of 18 seconds. The energy is off the charts at 14823. This is a true groundswell. The wind is offshore from the N, keeping it glassy. This is a day for experts only. The size and power are extreme, and the long period will make it wrap and wedge perfectly at Asakawa. This is the standout of the entire forecast. It’s a long way out, but the signs are incredible.
Rusty.
Short Range ForecastHeavy rain (total 42mm), heaviest during Wed afternoon. Warm (max 27°C on Wed morning, min 22°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Thu afternoon. Warm (max 28°C on Sat morning, min 23°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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) | SE 9 | SE 8 | S 9 | S 9 | S 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SSE 7 | SSE 7 | E 14 | E 13 | ESE 9 | SE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 540 | 313 | 287 | 375 | 471 | 1027 | 715 | 243 | 106 | 103 | 120 | 98 | 111 | 51 | 49 | 37 | 35 | 32 | 71 | 262 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | glassy | cross-off | cross-off | cross-off | cross-off | glassy | glassy | glassy | glassy | on | glassy | cross-on | on | glassy |
High Tide | 4:19PM1.58m | 2:54AM1.54m | 4:52PM1.68m | 3:59AM1.68m | 5:21PM1.76m | 4:49AM1.79m | 5:47PM1.81m | 5:34AM1.87m | 6:13PM1.84m | 6:15AM1.89m | 6:37PM1.84m | 6:54AM1.85m | 7:00PM1.83m | |||||||
Low Tide | 9:45PM1.08m | 9:55AM0.25m | 10:28PM0.91m | 10:41AM0.18m | 11:04PM0.73m | 11:20AM0.16m | 11:38PM0.57m | 11:55AM0.21m | 00:11AM0.43m | 12:27PM0.30m | 00:43AM0.33m | 12:57PM0.43m | 1:15AM0.29m | |||||||
 |  |  | |  | |  |  |  | | |  | | | | |  | | | | |
 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — |
 | 6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — |
mm | 2 | 2 | 6 | 3 | 4 | 8 | 17 | — | — | 1 | — | 1 | 2 | — | — | 2 | — | 1 | 1 | — |
Temp °C | 26 | 25 | 25 | 26 | 26 | 27 | 26 | 24 | 27 | 24 | 24 | 27 | 26 | 25 | 28 | 27 | 26 | 28 | 28 | 25 |
Feels °C | 29 | 28 | 29 | 30 | 31 | 33 | 32 | 24 | 28 | 26 | 26 | 32 | 31 | 30 | 33 | 32 | 32 | 32 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | SE 9 | SE 8 | S 9 | S 9 | S 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SSE 7 | SSE 7 | S 7 | ESE 9 | ESE 9 | ESE 5 |
| kJ | 540 | 313 | 287 | 375 | 471 | 711 | 715 | 243 | 106 | 103 | 120 | 98 | 111 | 51 | 49 | 37 | 24 | 32 | 71 | 51 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 10 | SE 8 | SE 8 | SE 8 | E 18 | E 18 | E 16 | S 8 | E 15 | E 15 | E 15 | E 14 | SE 10 | SE 10 | SE 10 | ESE 10 | S 7 | SSE 6 | SE 8 |
| kJ | 22 | 225 | 171 | 136 | 182 | 6 | 6 | 5 | 5 | 4 | 17 | 17 | 15 | 24 | 24 | 25 | 35 | 15 | 23 | 102 |
Swell 3 Height (m) Direction Period (s) | SSW 11 | SW 11 | ESE 10 | ESE 10 | NNE 3 | — | — | E 16 | E 16 | E 18 | SE 11 | ESE 11 | E 6 | E 14 | E 13 | E 13 | E 14 | E 13 | SSW 11 | S 10 |
| kJ | 11 | 29 | 39 | 39 | 2 | — | — | 21 | 5 | 6 | 5 | 11 | 11 | 36 | 31 | 32 | 35 | 31 | 24 | 51 |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 3 | NE 3 | NNE 3 | — | SSE 8 | NNW 2 | NNE 6 | NE 5 | NE 4 | NE 4 | NNE 3 | — | NE 3 | — | — | ESE 3 | SE 4 | — | SE 8 |
| kJ | 16 | 5 | 5 | 4 | — | 1027 | 2 | 47 | 55 | 28 | 3 | 1 | — | 2 | — | — | 1 | 7 | — | 262 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 14 | 43 | 0 | 0 | 0 | 0 | 0 | 0 | 19 | 0 | 1 | 385 | 0 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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Information about the Asakawa Surf forecast
The above surf forecast table for Asakawa provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Asakawa can be found by selecting the local surf guide option on the grey menu. Our Asakawa 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 (Asakawa) 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 Asakawa 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.
Are you planning a holiday in Shikoku? If you are looking for accommodation near Asakawa, camping, hotels and holiday cottages in Shikoku, consider staying in Anan which is 41 km (25 miles) away. Other places in and around Shikoku where you can find information about places to rent, and car hire include Muroto which is 44 km (27 miles) away, Komatsushima, Aki and Kamojima.
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