Surf Forecasts:
Asakawa surf forecast from 15 Aug 2026:
- Best quality surf: Saturday 22 Aug, 12AM (local time) - 10ft (3.0m), 9s period, S swell with glassy winds.
- Most powerful swell: Friday 21 Aug, 12PM (local time) - 11ft (3.5m), 9s period, SSE swell with 1,947 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 6AM (local time) - 3.5ft (1.0m), 5s period with SE 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 Monday (Aug 17) at 6AM. The primary swell is predicted to be 1.0m and 5s period with a secondary swell of 0.5m and 8s. 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 3.5m 9s and forecast to arrive on Friday (Aug 21) at 12PM. 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+) | 6AM (Mon 17th Aug) | 3.5ft (1.0m) 5s |
| Best Surf | 12AM (Sat 22nd Aug) | 10ft (3.0m) 9s |
| Most Powerful | 12PM (Fri 21st Aug) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, grab your board and listen up. This is Rusty, and I’m looking at the charts for our local stretch. It’s a bit of a slow start, but there is a proper pulse of activity brewing for the end of the month. The water temp is feeling about average for this time of year, so no surprises there.
Right now, and for the next several days, it’s looking pretty flat and messy at Asakawa. The swell is tiny, under 3 feet, and the wind is mostly onshore or cross-onshore. You’re looking at poor surf conditions with weak wave energy, and a short, choppy period. Not worth the paddle.
The first real shift comes around Friday the 21st. We start to see a jump in size, with the swell hitting 10 ft from the SSE and the combined energy climbing. But hold your horses – the wind is still cross-onshore and there’s risk of t-storms. The quality is marginal. This trend continues through the weekend and into Monday the 24th. The swell stays in the 3 ft to 7 ft range, and the period starts to lengthen (up to 14 seconds), which usually means better shape, but the wind is fighting us. It’s not clean enough to get excited about.
Now, Tuesday the 25th and Wednesday the 26th is where we start to see the good stuff. The energy is pumping. On Wednesday morning, the wind goes glassy. It’s a 8 ft swell from the SE with a long 14-second period. This is going to be excellent for experienced surfers. The waves will have good power, but that long period might make it a bit walled-up at a beach break. Asakawa is a point break though, so it should handle that nicely.
The absolute standout, the one you want to circle on the calendar, is Friday the 28th of August. We are talking about a proper swell event. By Friday morning, it’s 15 ft from the SE with a very long 16-second period. And the wind? Glassy. This is a world-class setup. The forecast is for exceptional surf conditions for expert surfers. This is not for the faint of heart. The swell will be huge, with clean, powerful lines rolling into the point.
Saturday the 29th looks like it might actually be too big for the break, with a 28 ft swell predicted. After that, things start to drop back down quickly.
So, the long story short: we have a dry, poor stretch for the next week. Don't bother until next Wednesday the 26th for a fun session, but the real deal is Friday the 28th. That’s the one you wait for. Keep your fingers crossed the forecast holds.
Rusty.
Short Range ForecastHeavy rain (total 38mm), heaviest during Sun morning. Warm (max 29°C on Tue morning, min 25°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Fri morning. Warm (max 29°C on Wed morning, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
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 9 | ESE 6 | ESE 6 | ESE 6 | SE 5 | SE 11 | SE 5 | SE 11 | ESE 5 | ESE 9 | SE 10 | ESE 5 | ESE 6 | ESE 6 | SE 6 | S 8 | SSE 9 | S 10 | S 9 |
Wave Graph | |||||||||||||||||||
56 | 148 | 213 | 87 | 42 | 30 | 32 | 29 | 29 | 26 | 26 | 44 | 97 | 65 | 196 | 247 | 1711 | 1065 | 1743 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | on | on | glassy | on | on | glassy | cross-on | on | glassy | cross-on | cross-on | glassy | cross-on | on | glassy |
High Tide | 7:49AM1.78m | 8:14PM1.77m | 8:31AM1.66m | 8:38PM1.72m | 9:14AM1.51m | 9:01PM1.65m | 10:05AM1.37m | 9:25PM1.57m | 11:17AM1.25m | 9:52PM1.48m | 2:05PM1.21m | 10:36PM1.39m | |||||||
Low Tide | 1:48AM0.49m | 2:00PM0.39m | 2:24AM0.47m | 2:29PM0.58m | 3:02AM0.48m | 2:55PM0.76m | 3:42AM0.53m | 3:19PM0.92m | 4:31AM0.59m | 3:42PM1.07m | 5:42AM0.66m | 4:07PM1.20m | |||||||
— | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | |
6:49 | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | |
mm | 10 | 9 | 5 | 9 | 3 | 1 | 1 | — | — | 2 | 1 | — | — | — | — | 1 | 3 | 2 | 7 |
Temp °C | 25 | 26 | 26 | 25 | 28 | 28 | 26 | 29 | 28 | 26 | 29 | 29 | 26 | 26 | 27 | 26 | 28 | 29 | 26 |
Feels °C | 29 | 29 | 28 | 28 | 32 | 31 | 31 | 32 | 31 | 31 | 32 | 33 | 32 | 31 | 32 | 31 | 32 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 8 | S 9 | S 8 | S 8 | SSW 8 | SSW 8 | SE 11 | ESE 5 | ESE 9 | ESE 8 | SE 10 | SE 10 | SE 10 | SE 10 | S 8 | S 10 | S 10 | S 9 |
56 | 51 | 39 | 35 | 33 | 21 | 20 | 29 | 29 | 26 | 23 | 25 | 25 | 25 | 26 | 247 | 1194 | 1065 | 1306 | |
Swell 2 Height (m) Direction Period (s) | ESE 9 | E 10 | ESE 10 | ESE 10 | SE 11 | SE 11 | SE 11 | SSW 8 | ESE 8 | SE 10 | SE 10 | SSW 8 | SSW 8 | S 9 | SW 9 | SSW 13 | — | ESE 14 | E 15 |
26 | 51 | 33 | 31 | 42 | 30 | 30 | 19 | 24 | 16 | 26 | 14 | 6 | 7 | 3 | 17 | — | 18 | 4 | |
Swell 3 Height (m) Direction Period (s) | SE 12 | SE 12 | SE 11 | SE 11 | ESE 9 | ESE 9 | E 9 | E 8 | SSW 8 | SSW 8 | SSW 8 | ESE 8 | S 10 | E 8 | — | E 16 | — | — | — |
22 | 48 | 33 | 43 | 28 | 16 | 14 | 12 | 11 | 11 | 12 | 13 | 2 | 1 | — | 5 | — | — | — | |
Wind waves Height (m) Direction Period (s) | ESE 5 | ESE 6 | ESE 6 | ESE 6 | SE 5 | SE 5 | SE 5 | ESE 5 | — | ESE 4 | ESE 4 | ESE 5 | ESE 6 | ESE 6 | SE 6 | ESE 6 | SSE 9 | ESE 6 | S 9 |
33 | 148 | 213 | 87 | 39 | 29 | 32 | 27 | — | 17 | 18 | 44 | 97 | 65 | 196 | 93 | 1711 | 206 | 1743 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 43 | 43 | 475 | 43 | 43 | 11 | 0 | 64 | 385 | 0 | 19 | 11 | 0 | 64 | 11 | 0 | 19 | 19 | 0 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.











