Surf Forecasts:
Asakawa surf forecast from 27 Aug 2026:
- Best quality surf: Sunday 30 Aug, 6AM (local time) - 2.5ft (0.7m), 7s period, S swell with cross-offshore winds.
- Most powerful swell: Thursday 3 Sep, 12AM (local time) - 13ft (4.0m), 12s period, S swell with 4,054 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 6AM (local time) - 2.5ft (0.7m), 7s period with S 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 Sunday (Aug 30) at 6AM. The primary swell is predicted to be 0.7m and 7s period with a secondary swell of 0.4m and 11s. Another secondary swell of 0.4m and 4s is also forecast. 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 4.0m 12s and forecast to arrive on Thursday (Sep 03) at 12AM. 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 (Sun 30th Aug) | 2.5ft (0.7m) 7s |
| Best Surf | 6AM (Sun 30th Aug) | 2.5ft (0.7m) 7s |
| Most Powerful | 12AM (Thu 3rd Sep) | 13ft (4.0m) 12s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about what's coming up for us at Asakawa.
Straight up, it's a rough start. We are looking at a long, frustrating gap here. The first week or so is just not worth paddling out for. From now until the end of August and into early September, the conditions are a write-off. The wind is mostly cross-on or onshore, and the wave quality is poor. We’re talking about small, weak swell with combined energy readings in the low hundreds, that's barely a bump. It’s a tough stretch.
We get a bit of a tease around the 31st of August where the swell starts to build, but it's still messy. Then things go wild from the 1st of September, but not in a good way. A solid SSE swell kicks in, but it’s accompanied by strong onshore winds and storms, making it a complete mess.
For the morning of Thursday the 10th of September, the stars finally try to align. We get a decent 6.6ft SE groundswell with a 10-second period. A light N wind is blowing cross-offshore. The report says 'clean'. That could be the one window. It's a point break, and a longer period swell like this is often best for those setups, though period is not super long.
The standout, if you can call it that, is the afternoon of Thursday the 10th. The swell is still a solid 6.2ft from the SE with a 10-second period. Then, the wind goes totally glassy—NNE at only 3 mph. 'Expect very good surf conditions' for that afternoon. This is the best on offer, a real chance for clean, lined-up waves at the point. Expect it to be crowded, as Asakawa can get 'sometimes' busy, and with the best window in the whole forecast, people will be on it.
After that, it gets messy again quickly through the 11th and 12th, with the swell dropping back down. Overall, a long wait for a small window.
Short Range ForecastLight rain (total 5mm), mostly falling on Fri afternoon. Warm (max 31°C on Sat morning, min 26°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 78mm), heaviest during Tue morning. Warm (max 29°C on Mon morning, min 25°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | ||||||||||||||
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) | S 9 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | S 7 | S 7 | S 7 | S 11 | S 10 | S 9 | SSE 10 | SSE 10 | SSE 9 | SSE 10 | SSE 10 | SSE 10 | S 12 |
Wave Graph  | |||||||||||||||||||
 kJ | 235 | 85 | 85 | 73 | 110 | 97 | 53 | 39 | 52 | 64 | 194 | 246 | 523 | 567 | 904 | 885 | 1140 | 1406 | 4054 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross-on | on | cross | cross-on | cross-on | cross-on | on | on | on | on | on | on |
High Tide | 5:36AM1.78m | 6:30PM1.78m | 6:12AM1.83m | 6:52PM1.81m | 6:48AM1.84m | 7:14PM1.82m | 7:26AM1.80m | 7:38PM1.81m | 8:07AM1.73m | 8:03PM1.78m | 8:53AM1.61m | 8:30PM1.72m | |||||||
Low Tide | 11:50PM0.72m | 12:05PM0.20m | 00:18AM0.60m | 12:33PM0.23m | 00:48AM0.49m | 1:02PM0.31m | 1:19AM0.40m | 1:31PM0.43m | 1:53AM0.35m | 2:01PM0.58m | 2:31AM0.33m | 2:32PM0.75m | |||||||
 |  | |  |  | | | |  | | | |  | | | |  | |  | |
 | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — |
 | 6:35 | — | 6:34 | — | — | 6:32 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — |
mm | — | 1 | 4 | — | — | — | — | — | — | — | — | 1 | 14 | 13 | 13 | 23 | 7 | 7 | 17 |
Temp °C | 27 | 30 | 30 | 27 | 31 | 31 | 27 | 31 | 30 | 26 | 29 | 29 | 27 | 27 | 27 | 27 | 27 | 27 | 27 |
Feels °C | 31 | 35 | 35 | 32 | 33 | 34 | 31 | 34 | 32 | 30 | 33 | 33 | 32 | 29 | 29 | 29 | 29 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SW 9 | SSE 8 | SSE 8 | SSE 7 | S 7 | ESE 9 | S 7 | S 7 | SE 10 | S 7 | S 10 | S 9 | SSE 10 | SSE 10 | SSE 9 | SSE 10 | ESE 11 | E 10 | S 12 |
| kJ | 38 | 78 | 62 | 31 | 54 | 17 | 53 | 39 | 36 | 39 | 194 | 246 | 523 | 567 | 724 | 885 | 38 | 33 | 3501 |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SE 10 | SSE 10 | SSE 9 | SE 9 | SSE 9 | SE 11 | SE 10 | SW 10 | S 11 | SE 10 | SE 10 | ESE 14 | ESE 13 | ESE 12 | ESE 11 | — | SE 11 | E 11 |
| kJ | 22 | 15 | 10 | 9 | 13 | 8 | 19 | 27 | 4 | 64 | 35 | 35 | 18 | 33 | 49 | 42 | — | 5 | 20 |
Swell 3 Height (m) Direction Period (s) | E 11 | ESE 11 | E 11 | ESE 8 | E 10 | SE 13 | ESE 9 | ESE 10 | E 10 | SE 10 | E 6 | E 14 | E 13 | — | — | — | — | — | — |
| kJ | 9 | 23 | 9 | 7 | 7 | 7 | 8 | 9 | 2 | 38 | 1 | 16 | 32 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | S 9 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | WSW 3 | — | S 7 | SW 3 | — | — | — | — | SSE 9 | — | SSE 10 | SSE 10 | S 12 |
| kJ | 235 | 85 | 85 | 73 | 110 | 97 | 5 | — | 52 | 2 | — | — | — | — | 904 | — | 1140 | 1406 | 4054 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 2 | 2 | 11 | 2 | 2 | 30 | 2 | 11 | 11 | 2 | 43 | 19 | 369 | 475 | 475 | 369 | 369 | 433 | 370 |
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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