Surf Forecasts:
Asakawa surf forecast from 4 Jul 2026:
- Best quality surf: Saturday 11 Jul, 12AM (local time) - 13ft (4.0m), 17s period, S swell with glassy winds.
- Most powerful swell: Friday 10 Jul, 6PM (local time) - 13ft (4.0m), 18s period, S swell with 10,148 kJ wave energy.
- Next surfable swell (1★+): Sunday 5 Jul, 6AM (local time) - 2.5ft (0.8m), 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 Sunday (Jul 05) at 6AM. The primary swell is predicted to be 0.8m and 7s period with a secondary swell of 0.3m and 9s. Another secondary swell of 0.2m and 4s 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 4.0m 18s and forecast to arrive on Friday (Jul 10) at 6PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Tuesday (Jul 07) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sun 5th Jul) | 2.5ft (0.8m) 7s |
| Best Surf | 12AM (Sat 11th Jul) | 13ft (4.0m) 17s |
| Most Powerful | 6PM (Fri 10th Jul) | 13ft (4.0m) 18s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
Updates in hr min s Forecast update imminent
Howdy, Rusty here again, same stretch but I’ll give it to you in feet and miles per hour.
We’re looking at a proper slow start at Asakawa, this point break in Japan. The first few days – Saturday the 4th and Sunday the 5th – are flat and ugly, not worth paddling out. It’s a waiting game. The water is a bit colder than normal at 76° for this time of year, so keep the rubber handy.
The real standout is Friday morning, July 10th. We’ve got a solid 13ft swell out of the south with a very long 17-second period, and the combined wave energy is cranking at 8480 (strong). Wind is light cross-onshore from the SE at just 3 mph, so it’s clean enough. Friday afternoon sees even more juice – 13ft, same period, energy jumping to 9522 – but the wind goes onshore, so morning is your window. That Saturday, July 11th, still holds 13ft out of the SSW, 16-second period, 7650 energy, but light onshore wind again. For a point break, that long-period groundswell is a dream – it’ll wrap in nicely. These waves are well over 8ft, so experts only. Crowds can show here, but at that size only the brave will be out.
After that, it drops off quickly. Sunday the 12th sees 7ft, then Monday the 13th morning turns glassy with 4ft from the south – perfect for intermediates wanting a clean, easy session. The rest of the second week is mostly small, short-period junk, with a few glassy mornings offering tiny, surfable waves. The biggest quiet spell is the first 4 days, then from July 14th onward it’s mostly disappointing.
Best call: get out early Friday, July 10th, for that big south groundswell, or Monday morning, July 13th, for small and clean.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Sat afternoon. Warm (max 29°C on Mon afternoon, min 23°C on Sat afternoon). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Tue afternoon. Warm (max 27°C on Tue afternoon, min 23°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sat 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SE 9 | ESE 9 | SSW 7 | SE 9 | SSW 6 | SE 15 | SE 14 | SE 13 | SE 16 | SE 16 | SE 17 | SE 16 | SSE 17 | SSE 16 | SSE 16 | SSE 16 | S 16 | S 17 | S 17 | S 17 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 13 | 15 | 53 | 20 | 21 | 149 | 301 | 451 | 421 | 1014 | 3496 | 2484 | 5406 | 5002 | 3913 | 3956 | 5708 | 8480 | 9522 | 10011 | 7650 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | on | on | glassy | cross-on | cross | cross-off | cross | on | cross-on | on | cross-on | on | on | on | glassy | cross-on | on | glassy | on |
High Tide | 9:11PM1.64m | 8:27AM1.59m | 9:43PM1.63m | 9:16AM1.51m | 10:17PM1.62m | 10:17AM1.42m | 10:55PM1.60m | 11:38AM1.36m | 11:41PM1.58m | 1:20PM1.35m | 00:36AM1.58m | 3:00PM1.43m | 1:41AM1.60m | ||||||||
Low Tide | 2:51AM0.86m | 3:02PM0.38m | 3:36AM0.81m | 3:39PM0.51m | 4:28AM0.75m | 4:23PM0.66m | 5:30AM0.68m | 5:17PM0.83m | 6:40AM0.57m | 6:30PM0.98m | 7:54AM0.44m | 8:00PM1.08m | 9:03AM0.28m | ||||||||
 |  | | |  |  |  |  | |  |  | | |  | |  | | | | | | |
 | — | — | 4:56 | — | — | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 |
 | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | 7:15 |
mm | 4 | 1 | 1 | 2 | 1 | — | — | — | — | 1 | — | 2 | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 24 | 25 | 25 | 25 | 28 | 29 | 26 | 28 | 27 | 25 | 25 | 25 | 24 | 25 | 26 | 24 | 27 | 27 | 24 | 28 |
Feels °C | 28 | 28 | 29 | 28 | 30 | 30 | 32 | 30 | 32 | 31 | 29 | 29 | 28 | 28 | 28 | 29 | 28 | 30 | 30 | 28 | 32 |
Swell 1 Height (m) Direction Period (s) | SE 9 | S 4 | SSW 7 | SW 6 | SSW 6 | SE 15 | SE 14 | SE 13 | SE 12 | SE 16 | SE 17 | SE 16 | SSE 17 | SSE 16 | SSE 16 | SSE 16 | S 16 | S 17 | S 17 | S 17 | SSW 16 |
| kJ | 12 | 6 | 53 | 19 | 21 | 149 | 301 | 451 | 306 | 1014 | 3496 | 2484 | 5406 | 5002 | 3913 | 3956 | 5708 | 8480 | 9522 | 10011 | 7650 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | ESE 9 | ESE 9 | SE 9 | ESE 4 | SE 10 | SE 9 | SSW 7 | SE 16 | ESE 12 | — | SSE 18 | E 9 | E 9 | S 18 | S 18 | S 17 | — | — | — | — |
| kJ | 8 | 15 | 7 | 20 | 7 | 27 | 3 | 70 | 421 | 235 | — | 2213 | 106 | 133 | 1487 | 1404 | 3118 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | ESE 12 | SSW 5 | SE 11 | S 8 | SSW 7 | ESE 3 | — | SE 18 | SSW 7 | SW 6 | — | — | — | — | E 9 | E 9 | E 8 | — | — | — | — |
| kJ | 13 | 6 | 18 | 5 | 10 | 1 | — | 83 | 31 | 10 | — | — | — | — | 57 | 55 | 49 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | S 3 | — | ESE 4 | SE 4 | — | SSW 7 | SSW 7 | NNE 3 | NE 4 | E 7 | E 8 | — | — | — | — | — | — | — | — | — | — |
| kJ | 4 | — | 10 | 19 | — | 38 | 116 | 3 | 4 | 68 | 124 | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 305 | 30 | 14 | 43 | 30 | 11 | 2 | 0 | 14 | 11 | 11 | 11 | 11 | 11 | 19 | 11 | 0 | 19 | 19 | 0 | 19 |
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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