Surf Forecasts:
Asakawa surf forecast from 28 Aug 2026:
- Best quality surf: Saturday 29 Aug, 9PM (local time) - 3ft (0.9m), 7s period, SSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 9AM (local time) - 7ft (2.2m), 10s period, SSE swell with 1,092 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 9PM (local time) - 3ft (0.9m), 7s 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 9PM. The primary swell is predicted to be 0.9m and 7s period with a secondary swell of 0.3m and 11s. Another secondary swell of 0.2m and 9s 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 2.2m 10s and forecast to arrive on Wednesday (Sep 02) at 9AM. 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+) | 9PM (Sat 29th Aug) | 3ft (0.9m) 7s |
| Best Surf | 9PM (Sat 29th Aug) | 3ft (0.9m) 7s |
| Most Powerful | 9AM (Wed 2nd Sep) | 7ft (2.2m) 10s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down Asakawa over the next couple weeks.
Honestly, it’s a rough start. For the first week or so, the surf is mostly poor, with onshore winds chopping everything up. The swell energy is low to moderate at the beginning, and even when the waves get a bit bigger, the wind kills the quality. You’re looking at a long gap of no good options until we get into the second week.
The first real highlight is Tuesday morning, September 8th at Asakawa. You’ve got a 4ft swell from the SE, combined with a light offshore breeze from the NE at about 6 mph. The combined energy hits 349, and it’s described as clean. The point should be offering up some tidy, lined-up waves.
Then hold out for Thursday morning, September 10th. Another clean one. Swell builds a touch to 4ft from the ESE, with a light offshore wind from the west at just 3 mph. That’s nearly glassy. Combined energy is 555. “Expect good surf conditions,” and it should be fun out there.
The best of the whole forecast is Friday morning, September 11th. We’ve got a 5ft ESE swell, a nice long period of 12 seconds, and a light offshore from the NNE at 3 mph. That’s a proper groundswell with some grunt. Combined energy is 649, and conditions are clean again. This is the morning to score. Get out there early.
After that, Saturday morning, September 12th still gives a clean 3ft from the east with a light offshore breeze, but the energy drops. Still a decent session if you missed the Friday standouts.
Keep in mind, Asakawa can get busy on the good days, so the early bird gets the wave.
Overall, the first week is a bust. Everything worthwhile starts around September 8th, with the 11th being the crown jewel. Mark your calendar.
Stay wet,
Rusty
Short Range ForecastLight rain (total 6mm), mostly falling on Sat 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 51mm), heaviest during Wed night. Warm (max 28°C on Tue morning, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | ||||||||||||||
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 8 | S 7 | SE 10 | S 8 | S 9 | S 10 | S 9 | S 9 | S 9 | SSE 10 | SSE 10 | SSE 10 | S 11 | S 10 | S 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 73 | 75 | 128 | 75 | 88 | 39 | 37 | 71 | 78 | 184 | 194 | 188 | 270 | 1092 | 763 | 625 | 734 | 452 | 325 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | glassy | cross-on | cross | cross-on | on | glassy | cross-on | on | on | on | on | on | on | on | cross-on |
High Tide | 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 | 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 | |||||||
 |  |  |  |  | |  |  | |  | | | | | | | | | | |
 | — | 5:33 | — | — | 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 | — | — | 2 | — | 1 | 2 | 1 | — | — | 1 | 6 | 4 | 11 | 3 | 2 | 11 | 5 | 8 | 30 |
Temp °C | 27 | 31 | 30 | 27 | 30 | 30 | 27 | 30 | 30 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 27 | 27 | 27 |
Feels °C | 31 | 34 | 34 | 32 | 35 | 34 | 32 | 32 | 33 | 31 | 31 | 31 | 31 | 30 | 30 | 29 | 29 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SSE 7 | SSW 8 | ESE 9 | SE 11 | S 7 | S 7 | S 7 | S 8 | S 9 | S 10 | S 9 | S 9 | S 9 | SSE 10 | SSW 12 | SSE 10 | S 11 | S 10 | S 10 |
| kJ | 21 | 75 | 8 | 19 | 54 | 39 | 25 | 71 | 78 | 184 | 194 | 188 | 270 | 836 | 283 | 625 | 734 | 452 | 325 |
Swell 2 Height (m) Direction Period (s) | SSE 9 | SE 10 | SSE 9 | ESE 9 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 13 | ESE 12 | E 12 | E 11 | ESE 11 | SSW 12 | ESE 10 | ESE 9 | SSW 12 |
| kJ | 9 | 14 | 8 | 8 | 27 | 36 | 37 | 25 | 25 | 23 | 58 | 50 | 67 | 61 | 37 | 161 | 20 | 144 | 125 |
Swell 3 Height (m) Direction Period (s) | ESE 8 | E 10 | SE 13 | SSE 9 | ESE 10 | SW 11 | SW 9 | S 14 | S 12 | ESE 14 | SE 9 | SE 9 | SE 9 | SSW 14 | SE 11 | ESE 11 | ESE 8 | E 10 | S 13 |
| kJ | 7 | 7 | 7 | 8 | 9 | 4 | 3 | 4 | 27 | 40 | 22 | 22 | 14 | 79 | 18 | 38 | 13 | 8 | 125 |
Wind waves Height (m) Direction Period (s) | SSW 8 | SW 5 | SSW 8 | SSW 8 | SSW 8 | SSW 4 | SW 3 | — | — | — | ESE 4 | ESE 5 | ESE 5 | SSE 10 | SSE 10 | E 5 | — | — | ESE 8 |
| kJ | 73 | 33 | 128 | 75 | 88 | 9 | 2 | — | — | — | 11 | 39 | 36 | 1092 | 763 | 30 | — | — | 222 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 2 | 2 | 14 | 2 | 0 | 11 | 2 | 11 | 11 | 0 | 43 | 581 | 43 | 11 | 369 | 11 | 402 | 370 | 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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