Surf Forecasts:
Asakawa surf forecast from 15 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 6AM (local time) - 4ft (1.2m), 7s period, E swell with glassy winds.
- Most powerful swell: Saturday 22 Aug, 9AM (local time) - 5ft (1.5m), 11s period, S swell with 535 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 9PM (local time) - 2.5ft (0.7m), 9s period with S 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 15) at 9PM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.3m and 9s. Another secondary swell of 0.5m 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 1.5m 11s and forecast to arrive on Saturday (Aug 22) 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 15th Aug) | 2.5ft (0.7m) 9s |
| Best Surf | 6AM (Wed 19th Aug) | 4ft (1.2m) 7s |
| Most Powerful | 9AM (Sat 22nd Aug) | 5ft (1.5m) 11s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here, checking in on the local banks. Honestly, it's a bit of a slow start for the next week and a half. We've got a long stretch of small, messy conditions on the cards before a proper pulse of energy finally shows up.
Right now, Asakawa is the only game in town, but it's a frustrating one. It's a point break that's inconsistent, so we need the stars to align. The water temp is sitting at 83°, which is about average for this time of year, so no surprise there.
The outlook for the next week is grim. We start off with a weak, confused swell. Saturday morning, the 15th, offers the best of a bad lot with glassy conditions and 2ft waves from the south, but the energy is low (140). It's surfable, but nothing to write home about. From Sunday, the 16th, through to Monday, the 19th, things get ugly with poor surf conditions, cross-onshore winds, and short-period windswell under 3ft. There's a brief window of glassy surf on Wednesday morning, the 19th, with 4ft from the east, but it's still ordinary. The whole week is a write-off, with the combined energy rarely climbing above 200.
Finally, we get some hope. The standout window is Monday, the 24th of August. Monday morning, the swell really kicks in. We're looking at a solid 7ft groundswell from the east-southeast with a very long period of 17 seconds. The combined energy is pumping at 2643, which is strong. The winds are glassy, and the conditions are rated excellent for experienced surfers. This is the one to circle. The 8ft afternoon is still good, but with a bit of a risk of storms. The 25th of August is also a great option with clean, cross-offshore winds from the north-northeast and a solid 6ft ESE swell (1257 energy). After that, the swell fades quickly through the rest of the week, with only small, glassy leftovers on the 30th of August.
So, to sum it up: the first week is a dud. The real action is on the 24th and 25th of August. Get ready for a proper session.
Rusty.
Short Range ForecastHeavy rain (total 51mm), heaviest during Sun morning. Warm (max 29°C on Sat morning, min 25°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Tue morning. Warm (max 29°C on Tue morning, min 26°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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 10 | E 10 | S 9 | ESE 6 | ESE 6 | ESE 6 | SE 5 | SE 5 | SE 11 | E 8 | ESE 6 | ESE 7 | E 7 | ESE 7 | ESE 5 | S 9 | SSE 8 | SSE 8 | S 11 | S 10 | S 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 92 | 159 | 56 | 143 | 213 | 108 | 53 | 39 | 30 | 113 | 29 | 75 | 131 | 73 | 61 | 57 | 112 | 77 | 388 | 461 | 467 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | on | glassy | glassy | on | glassy | glassy | on | cross | cross-on | cross-on | cross |
High Tide | 7:49PM1.81m | 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 | 1:30PM0.22m | 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 | ||||||||
 | |  |  |  | | | | |  |  |  | | |  | | | | | |  | |
 | 5:22 | — | — | 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 | 10 | 11 | 6 | — | 5 | 1 | — | — | — | 2 | 1 | — | — | — | — | — | — |
Temp °C | 29 | 29 | 25 | 26 | 26 | 25 | 27 | 29 | 26 | 29 | 29 | 26 | 28 | 29 | 27 | 29 | 29 | 27 | 31 | 30 | 27 |
Feels °C | 32 | 32 | 29 | 29 | 28 | 28 | 31 | 33 | 31 | 32 | 33 | 32 | 33 | 34 | 33 | 33 | 33 | 32 | 34 | 33 | 32 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 9 | S 9 | S 8 | S 9 | S 8 | S 8 | SE 5 | ESE 5 | ESE 5 | SE 10 | ESE 7 | ESE 8 | ESE 7 | ESE 5 | S 9 | SSE 8 | SSE 8 | S 11 | S 10 | S 10 |
| kJ | 92 | 79 | 56 | 51 | 39 | 35 | 33 | 39 | 19 | 15 | 28 | 75 | 88 | 73 | 61 | 57 | 112 | 77 | 388 | 461 | 467 |
Swell 2 Height (m) Direction Period (s) | E 10 | ESE 10 | ESE 9 | SE 12 | ESE 10 | ESE 10 | SE 11 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 4 | ESE 10 | ESE 11 | SE 11 |
| kJ | 30 | 31 | 26 | 48 | 33 | 31 | 42 | 21 | 20 | 19 | 11 | 27 | 26 | 26 | 25 | 34 | 26 | 6 | 42 | 44 | 30 |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 10 | SE 12 | SE 18 | SE 11 | SE 11 | ESE 9 | SE 11 | SE 11 | ESE 8 | E 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | E 7 | SW 8 | ESE 10 | E 9 | E 9 | ESE 9 |
| kJ | 18 | 16 | 22 | 13 | 33 | 43 | 17 | 30 | 30 | 22 | 6 | 12 | 12 | 12 | 6 | 4 | 3 | 41 | 14 | 13 | 16 |
Wind waves Height (m) Direction Period (s) | — | E 10 | ESE 5 | ESE 6 | ESE 6 | ESE 6 | SE 5 | — | — | E 8 | ESE 6 | — | E 7 | — | — | ESE 6 | ESE 5 | — | ESE 4 | — | — |
| kJ | — | 159 | 25 | 143 | 213 | 108 | 53 | — | — | 113 | 29 | — | 131 | — | — | 21 | 29 | — | 17 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 19 | 43 | 43 | 475 | 43 | 43 | 475 | 19 | 22 | 43 | 0 | 0 | 511 | 0 | 0 | 11 | 2 | 11 | 581 | 2 |
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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