Surf Forecasts:
Asakawa surf forecast from 28 Aug 2026:
- Best quality surf: Saturday 29 Aug, 6AM (local time) - 2.5ft (0.7m), 8s period, SSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 9PM (local time) - 10ft (3.0m), 11s period, SSE swell with 1,812 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 6AM (local time) - 2.5ft (0.7m), 8s period with SSW 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 Saturday (Aug 29) at 6AM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.3m and 8s. Another secondary swell of 0.8m 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 3.0m 11s and forecast to arrive on Wednesday (Sep 02) at 9PM. 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 (Sat 29th Aug) | 2.5ft (0.7m) 8s |
| Best Surf | 6AM (Sat 29th Aug) | 2.5ft (0.7m) 8s |
| Most Powerful | 9PM (Wed 2nd Sep) | 10ft (3.0m) 11s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
G’day, Rusty here. Not gonna lie, it’s a rough start. For the first ten days or so, the surf is pretty much a write-off at Asakawa. The winds are mostly cross-onshore or onshore, and the conditions are just poor – choppy, bumpy, and messy. There is a little glimmer on the morning of the 30th (Sunday) when it goes glassy with a tiny 2ft swell from the S, but it’s weak with only minor energy (96). That’s probably the best you’ll get for a paddle in quiet moments, but it’s hardly a standout.
The water temp is sitting at a nice 84°F, which is a touch warmer than normal for this time of year, so that’s a little bonus if you do get in.
Things get a bit more interesting around that 6th/7th of September. From the 5th, the swell starts to crank up, and by the Sunday morning (6th September) you’ve got a solid 13ft swell from the SSE. But – and it's a big but – that’s coming with onshore and cross-onshore winds, and it’s a strong, very strong to massive wave energy (6336). This is expert territory only. The period is a nice long 13 seconds for that morning, so it’s proper groundswell, but for a point break like Asakawa, that long period can make it a bit straight. It’s also rarely breaking here, so to see this kind of size is notable. Still, the wind will chop it up; it’s described as marginal, but for a big-wave crew it could be on.
The real standout, though, if you’ve got the patience, is the morning of Thursday the 10th of September. Finally, we get a clean setup. The wind goes glassy, and you’ve got a clean 5ft SSE swell with a decent 10-second period and moderate energy (413). The direction (SE) is bang on for Asakawa’s optimal swell direction. It’s not huge, but it will be clean, and for this spot, that’s a gift. The Friday morning the 11th is also looking clean and glassy with 5ft SSE swell. Crowds are possible here sometimes, so get in early.
So, if I’m calling it: the 10th and 11th of September mornings are your best bet for a good, clean session. The big 13ft stuff on the 6th/7th is for the kamikazes only.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Fri morning. Warm (max 31°C on Fri morning, min 24°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 63mm), heaviest during Tue morning. Warm (max 30°C on Mon morning, min 26°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | |||||||||||||||
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) | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 8 | S 7 | SSW 7 | S 7 | S 10 | S 11 | SSE 9 | SSE 9 | SSE 10 | SSE 10 | S 10 | SSE 11 | SSE 11 | SSE 10 | SSE 10 | S 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 85 | 116 | 73 | 110 | 117 | 75 | 54 | 73 | 38 | 165 | 269 | 308 | 510 | 726 | 970 | 1487 | 1426 | 1661 | 1351 | 932 | 470 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross-on | cross | glassy | cross-on | cross | cross-on | on | cross-on | cross-on | on | on | on | on | on | on | on | on |
High Tide | 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 | 9:51AM1.47m | 9:02PM1.65m | ||||||||
Low Tide | 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 | 3:16AM0.36m | 3:06PM0.93m | ||||||||
 |  |  |  | |  | | | |  | |  | | | | | |  | | | | |
 | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — |
 | — | 6:34 | — | — | 6:32 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:25 | — |
mm | 1 | 2 | — | — | 1 | — | 1 | 1 | — | — | 2 | 12 | 11 | 9 | 17 | 5 | 3 | 4 | 2 | 3 | 9 |
Temp °C | 31 | 31 | 27 | 31 | 30 | 27 | 30 | 30 | 26 | 30 | 29 | 27 | 27 | 27 | 27 | 28 | 28 | 26 | 29 | 29 | 27 |
Feels °C | 35 | 35 | 32 | 34 | 33 | 32 | 34 | 33 | 30 | 33 | 32 | 30 | 29 | 29 | 29 | 30 | 31 | 29 | 31 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SSE 7 | S 7 | SSE 9 | SE 11 | S 7 | SE 10 | S 7 | S 10 | S 11 | SSE 9 | SSE 9 | SSE 10 | SSE 10 | SSE 10 | SSE 11 | SSE 11 | SSE 10 | SSE 10 | S 10 |
| kJ | 78 | 64 | 21 | 54 | 8 | 19 | 54 | 36 | 38 | 165 | 269 | 308 | 510 | 726 | 970 | 1175 | 1426 | 1306 | 1351 | 932 | 470 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SSE 10 | SSE 9 | SE 9 | ESE 9 | ESE 9 | SE 10 | SW 11 | SE 10 | SE 10 | SE 10 | SE 9 | ESE 13 | ESE 12 | ESE 11 | ESE 10 | ESE 10 | ESE 10 | E 10 | ESE 9 | ESE 8 |
| kJ | 15 | 10 | 9 | 13 | 8 | 8 | 27 | 4 | 37 | 35 | 24 | 31 | 33 | 49 | 42 | 36 | 37 | 21 | 31 | 43 | 96 |
Swell 3 Height (m) Direction Period (s) | ESE 11 | E 11 | ESE 8 | E 10 | SE 13 | SE 9 | ESE 10 | E 10 | SW 9 | SE 13 | E 14 | E 14 | E 13 | — | — | — | SE 11 | — | E 15 | SSW 11 | SE 13 |
| kJ | 23 | 9 | 7 | 7 | 7 | 3 | 9 | 2 | 3 | 7 | 4 | 15 | 82 | — | — | — | 5 | — | 4 | 47 | 7 |
Wind waves Height (m) Direction Period (s) | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 8 | WSW 4 | SSW 7 | — | — | — | — | — | — | — | S 10 | — | SSE 11 | — | E 9 | — |
| kJ | 85 | 116 | 73 | 110 | 117 | 75 | 6 | 73 | — | — | — | — | — | — | — | 1487 | — | 1661 | — | 190 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 11 | 2 | 2 | 14 | 2 | 0 | 30 | 2 | 43 | 433 | 43 | 475 | 475 | 473 | 475 | 581 | 11 | 11 | 11 | 43 |
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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