Surf Forecasts:
Asakawa surf forecast from 8 Aug 2026:
- Best quality surf: Sunday 9 Aug, 3AM (local time) - 5ft (1.5m), 11s period, SSW swell with glassy winds.
- Most powerful swell: Sunday 9 Aug, 6AM (local time) - 5ft (1.5m), 12s period, SSW swell with 593 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 3AM (local time) - 5ft (1.5m), 11s 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 Sunday (Aug 09) at 3AM. The primary swell is predicted to be 1.5m and 11s period with a secondary swell of 1.1m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 1.5m 12s and forecast to arrive on Sunday (Aug 09) at 6AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Tuesday (Aug 11) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Sun 9th Aug) | 5ft (1.5m) 11s |
| Best Surf | 3AM (Sun 9th Aug) | 5ft (1.5m) 11s |
| Most Powerful | 6AM (Sun 9th Aug) | 5ft (1.5m) 12s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about Asakawa in feet and the old Fahrenheit.
First off, water temps are running about average for the season, so nothing wild there.
The real standout, the one you want to save the date for, is Sunday morning, August 17th. We’re lookin’ at a solid 6ft easterly swell with an 11s period – that’s proper groundswell. The energy is strong (939) and the wind is dead calm, glassy as a mirror. Expect very good surf conditions. It’s a point break, so that long-period swell will wrap in with clean lines, perfect for an intermediate surfer. Crowds are possible, so get in early.
Leading up to it, Sunday, August 9th, is a decent starter. 4ft from the SSW with a 12s period, glassy wind. Combined energy is moderate (835). Clean, well-shaped waves.
Monday, August 10th, sees a bit of a drop to 4ft from the south, but still glassy. Energy is moderate (513). Then it gets small. From Tuesday, August 11th to Friday, August 14th, the swell hangs around 2ft or less, with short periods. The energy gets weak (down to 107). It’s surfable, but ordinary.
Saturday, August 15th, bumps up to 4ft from the east, but the wind is messy, so it’s not worth the paddle.
Then Monday, August 17th hits. After that, Tuesday, August 18th afternoon has a 5ft ESE swell with glassy wind – a good secondary option. The rest of the second week, from August 19th onward, is mostly small, weak, and onshore. The energy disappears, and thunderstorms are a regular thing. There’s a small window on Friday, August 21st, with a 2ft ESE swell and an 11s period, glassy in the morning, but it’s a scrap.
So, lock in Sunday, August 17th. That’s the one.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sun afternoon. Warm (max 30°C on Sun morning, min 23°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 33mm), heaviest during Wed night. Warm (max 28°C on Wed morning, min 23°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
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 11 | SSW 12 | SSW 12 | ESE 13 | S 10 | S 10 | S 10 | S 10 | SSW 10 | SSW 11 | SSW 11 | SSW 11 | S 9 | S 9 | SSW 9 | SSW 9 | S 9 | SSW 9 | S 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 447 | 384 | 378 | 286 | 242 | 194 | 260 | 265 | 276 | 240 | 105 | 202 | 83 | 57 | 113 | 86 | 81 | 82 | 76 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | on | glassy | glassy | glassy | cross-off | cross-off | cross-off | off | glassy | glassy | glassy | glassy | glassy | glassy | glassy | on | cross-off |
High Tide | 1:11AM1.52m | 4:29PM1.55m | 2:42AM1.58m | 5:14PM1.67m | 3:52AM1.69m | 5:51PM1.75m | 4:49AM1.80m | 6:24PM1.81m | 5:39AM1.88m | 6:54PM1.83m | 6:24AM1.90m | 7:22PM1.83m | |||||||
Low Tide | 8:57AM0.31m | 9:34PM1.16m | 10:02AM0.17m | 10:33PM1.05m | 10:55AM0.05m | 11:18PM0.92m | 11:39AM-0.00m | 11:58PM0.78m | 12:20PM0.01m | 00:35AM0.66m | 12:56PM0.09m | 1:12AM0.56m | |||||||
 |  |  | | | | | |  |  |  |  |  | | |  | | | | |
 | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — |
 | 6:57 | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — |
mm | — | — | 1 | — | 1 | 1 | — | — | — | — | 1 | 3 | 13 | 4 | 4 | 5 | — | 3 | 3 |
Temp °C | 26 | 30 | 29 | 26 | 29 | 29 | 27 | 29 | 30 | 24 | 28 | 24 | 24 | 24 | 25 | 25 | 28 | 28 | 25 |
Feels °C | 32 | 33 | 32 | 30 | 33 | 34 | 31 | 28 | 30 | 24 | 30 | 27 | 28 | 28 | 29 | 30 | 31 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 11 | SSW 12 | SSW 12 | S 11 | S 10 | S 10 | S 10 | S 10 | SSW 10 | SSW 11 | S 10 | SSW 11 | S 9 | SSW 10 | SSW 9 | SSW 9 | S 9 | SSW 9 | S 9 |
| kJ | 447 | 384 | 378 | 240 | 242 | 194 | 260 | 265 | 276 | 240 | 98 | 202 | 83 | 55 | 113 | 86 | 81 | 82 | 76 |
Swell 2 Height (m) Direction Period (s) | SE 8 | ESE 13 | E 13 | ESE 13 | E 12 | E 12 | E 12 | E 11 | E 11 | E 10 | SSW 11 | S 10 | SSW 10 | S 9 | ESE 4 | ESE 4 | SE 11 | SE 11 | SE 8 |
| kJ | 173 | 372 | 339 | 286 | 193 | 144 | 99 | 60 | 37 | 35 | 105 | 31 | 67 | 57 | 5 | 3 | 19 | 30 | 18 |
Swell 3 Height (m) Direction Period (s) | ESE 10 | SE 7 | S 11 | SSW 11 | SSW 11 | SW 11 | SE 14 | SE 13 | SE 13 | NE 4 | E 10 | SE 13 | SE 12 | SE 12 | SE 12 | SE 12 | E 9 | E 9 | SE 11 |
| kJ | 104 | 79 | 181 | 219 | 78 | 57 | 31 | 28 | 27 | 2 | 18 | 26 | 24 | 23 | 22 | 22 | 6 | 15 | 19 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NE 2 | NE 5 | NE 4 | N 4 | NNE 3 | — | — | ESE 3 | — | — | ESE 3 | ESE 5 | ESE 5 |
| kJ | — | — | — | — | — | — | 1 | 10 | 13 | 10 | 3 | — | — | 4 | — | — | 1 | 8 | 39 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 19 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 19 | 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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