Surf Forecasts:
Asakawa surf forecast from 26 Aug 2026:
- Best quality surf: Friday 28 Aug, 6PM (local time) - 4.5ft (1.3m), 7s period, SSW swell with glassy winds.
- Most powerful swell: Tuesday 1 Sep, 6PM (local time) - 10ft (3.0m), 13s period, SSE swell with 3,024 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 6PM (local time) - 4.5ft (1.3m), 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 Friday (Aug 28) at 6PM. The primary swell is predicted to be 1.3m and 7s period with a secondary swell of 0.9m and 7s. Another secondary swell of 0.4m and 9s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 3.0m 13s and forecast to arrive on Tuesday (Sep 01) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Fri 28th Aug) | 4.5ft (1.3m) 7s |
| Best Surf | 6PM (Fri 28th Aug) | 4.5ft (1.3m) 7s |
| Most Powerful | 6PM (Tue 1st Sep) | 10ft (3.0m) 13s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here with the outlook for Asakawa. We’re in for a quiet start but there’s a heavy pulse coming in the second week if you can hold out.
First week is mostly weak and cross-onshore. Water temp is 84°, which is a touch warmer than normal for the season.
First decent window is Saturday the 29th of August with a glassy morning and tiny 3ft SSW swell, weak energy (113). It’s a longboarder’s special if you’re keen.
Monday the 1st of September brings a long-period groundswell (17 seconds from the S) with moderate energy, but the wind is cross-onshore and conditions are poor. No good.
The real standouts start hitting from the 2nd of September. Wednesday the 2nd morning sees 12ft from the SSE with very strong energy (4878), but it’s onshore and marginal. That’s big, heavy stuff for experts only.
The absolute best on offer is Saturday the 5th of September morning: 10ft of ESE swell, 8-second period, strong energy (1543), and light cross-offshore wind from the NE. The report calls it excellent for experienced surfers. This is the target.
Thursday the 4th of September morning is also worth noting: 7ft from the S, 10-second period, glassy, and very good conditions. That’s solid for advanced intermediates.
After the first week of small, frustrating surf, the second week delivers serious size. The 5th of September morning is the big prize. Long-range, so keep your fingers crossed.
Rusty out.
Short Range ForecastLight rain (total 6mm), mostly falling on Fri afternoon. Warm (max 31°C on Wed morning, min 26°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Sat afternoon. Warm (max 30°C on Sat morning, min 26°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | |||||||||||||||
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) | S 11 | S 11 | SSW 11 | SSE 9 | S 10 | S 9 | SSW 8 | S 7 | SSW 7 | SSW 8 | SSW 7 | SSW 7 | SSW 6 | S 7 | S 8 | S 8 | SE 12 | SSE 10 | S 17 | S 14 | SSE 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1006 | 640 | 308 | 206 | 354 | 198 | 110 | 108 | 111 | 75 | 104 | 71 | 43 | 51 | 66 | 66 | 47 | 183 | 699 | 944 | 1966 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross | glassy | glassy | cross-on | cross | glassy | cross-on | cross | on | on | cross-on | cross-on | cross-on | on |
High Tide | 5:47PM1.67m | 4:59AM1.70m | 6:08PM1.73m | 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 | ||||||||
Low Tide | 11:05AM0.27m | 11:22PM0.84m | 11:35AM0.21m | 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 | |||||||
 |  |  | | |  |  | | | | |  | | | | | |  | | | | |
 | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — |
 | — | 6:37 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — |
mm | — | — | — | — | — | — | 1 | 5 | — | — | 4 | 1 | — | 3 | 1 | — | — | 4 | 5 | 25 | 38 |
Temp °C | 31 | 31 | 27 | 31 | 31 | 26 | 30 | 29 | 27 | 30 | 29 | 27 | 30 | 29 | 27 | 30 | 29 | 26 | 27 | 26 | 27 |
Feels °C | 33 | 33 | 31 | 33 | 32 | 29 | 33 | 33 | 33 | 34 | 34 | 32 | 34 | 33 | 32 | 33 | 31 | 31 | 29 | 27 | 29 |
Swell 1 Height (m) Direction Period (s) | S 11 | S 11 | SSW 11 | SSE 9 | E 11 | S 9 | SSE 8 | SSW 8 | SSW 8 | SE 10 | ESE 9 | SE 11 | SSW 6 | S 7 | S 8 | SE 10 | SSE 9 | SSE 10 | SSE 10 | SE 9 | SSE 12 |
| kJ | 1006 | 640 | 308 | 206 | 23 | 198 | 61 | 14 | 73 | 14 | 8 | 19 | 43 | 51 | 66 | 35 | 47 | 183 | 356 | 446 | 1966 |
Swell 2 Height (m) Direction Period (s) | E 13 | SE 9 | SSE 9 | SSW 10 | SE 16 | E 11 | SE 10 | SSE 10 | SSE 7 | E 10 | SSE 9 | ESE 9 | SE 10 | SE 10 | SE 10 | S 10 | SSW 9 | SSW 8 | S 17 | S 14 | ESE 11 |
| kJ | 30 | 206 | 181 | 154 | 10 | 9 | 15 | 10 | 31 | 7 | 8 | 8 | 17 | 26 | 17 | 19 | 26 | 7 | 699 | 944 | 23 |
Swell 3 Height (m) Direction Period (s) | SE 15 | E 13 | E 12 | SSE 11 | E 11 | ESE 10 | E 11 | E 11 | SSE 9 | SSE 13 | SE 13 | SSE 9 | ESE 10 | SW 10 | S 13 | SW 10 | SE 12 | E 13 | E 12 | E 12 | — |
| kJ | 8 | 29 | 25 | 25 | 2 | 11 | 9 | 9 | 9 | 17 | 7 | 8 | 9 | 4 | 12 | 4 | 35 | 3 | 11 | 24 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | S 10 | SSW 8 | SSW 8 | S 7 | SSW 7 | SSW 8 | SSW 7 | SSW 7 | — | SW 6 | SW 5 | S 8 | — | SE 3 | — | SE 9 | — |
| kJ | — | — | — | — | 354 | 82 | 110 | 108 | 111 | 75 | 104 | 71 | — | 19 | 7 | 66 | — | 1 | — | 580 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 11 | 473 | 2 | 2 | 11 | 2 | 2 | 2 | 0 | 0 | 2 | 2 | 0 | 11 | 2 | 11 | 385 | 43 | 473 | 475 | 402 |
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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