Surf Forecasts:
Asakawa surf forecast from 18 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 6PM (local time) - 5.5ft (1.7m), 13s period, SE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 6PM (local time) - 5.5ft (1.7m), 13s period, SE swell with 1,006 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 3AM (local time) - 2.5ft (0.7m), 8s period with ESE 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 Wednesday (Aug 19) at 3AM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.4m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 1.7m 13s and forecast to arrive on Tuesday (Aug 25) at 6PM. Winds are predicted to be glassy at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Wed 19th Aug) | 2.5ft (0.7m) 8s |
| Best Surf | 6PM (Tue 25th Aug) | 5.5ft (1.7m) 13s |
| Most Powerful | 6PM (Tue 25th Aug) | 5.5ft (1.7m) 13s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here, let's get into it.
First up, the next week and a bit is pretty grim. We've got a run of small, weak, and messy surf at Asakawa (point) from Tuesday the 18th right through to the end of the weekend. The wind is mostly onshore from the south, and the swell is tiny – we're talking ankle to knee-high at best. The combined wave energy is weak, barely cracking 100 (88) at its best, and the water temp is sitting at 82.8°F, which is about average for the time of year. Honestly, it’s a write-off for a paddle. There is a morning here and there with glassy conditions, but the swell is just too small to bother. This spot is inconsistent at the best of times, and that's what we're seeing.
Now, if you can wait, things get seriously interesting. The standout window is from Tuesday the 25th of August right through to the start of September. The swell starts to build properly on Tuesday the 25th, with a long-period (16 seconds) groundswell arriving from the SE. The combined energy jumps right up (537) and the winds go clean cross-off from the NE. It’s still a bit small for the point at 3.3ft, but it's a sign of things to come.
The real magic, the absolute standout, is Thursday the 27th of August through to Friday the 28th. This is the one you circle on the calendar. We’re looking at a solid, powerful, long-period S swell hitting the point. On Thursday morning it’s 8.2ft from the SSE with a 15-second period, and by Friday morning it’s even bigger at 11.5ft from the S with a 16-second period. The combined energy is huge – 3114 on Thursday, and an incredible 5686 by Friday afternoon. To top it all off, the wind goes glassy or light offshore from the N and NE. This is a point break, so those long-period groundswells will wrap in beautifully. It will be big, powerful, and clean. This is only for experienced surfers though – anything over 8.2ft is experts-only. The crowds are *sometimes* an issue here, and on a day like this, you can bet they will be. Expect a few others in the water, but for waves of this quality, it’s worth it.
There's a secondary punch on Tuesday the 1st of September, with a solid 9.8ft ESE swell and clean offshore winds from the north. The energy is still massive (3127). It's a bit of a different direction, but with those winds it could offer a fun option if the main S swell has faded. This is still a high-quality, expert window.
The first week is dead, but the second week is an epic, powerful groundswell swell event. If you can wait, it's going to be well worth it.
Short Range ForecastLight rain (total 5mm), mostly falling on Tue afternoon. Warm (max 30°C on Thu morning, min 25°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 30°C on Sat morning, min 25°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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) | SE 5 | SE 8 | ESE 8 | ESE 8 | SE 10 | SE 10 | SE 10 | S 9 | S 9 | S 10 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SW 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 36 | 69 | 56 | 51 | 29 | 25 | 25 | 99 | 101 | 190 | 173 | 141 | 149 | 116 | 90 | 88 | 86 | 70 | 94 | 90 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | glassy | glassy | on | cross | glassy | on | cross | glassy | on | cross | glassy | on | cross-off | glassy | on | glassy |
High Tide | 9:01PM1.65m | 10:05AM1.37m | 9:25PM1.57m | 11:17AM1.25m | 9:52PM1.48m | 2:05PM1.21m | 10:36PM1.39m | 4:20PM1.32m | 00:36AM1.34m | 4:43PM1.42m | 2:31AM1.38m | 5:04PM1.52m | ||||||||
Low Tide | 3:42AM0.53m | 3:19PM0.92m | 4:31AM0.59m | 3:42PM1.07m | 5:42AM0.66m | 4:07PM1.20m | 7:28AM0.66m | 8:19PM1.26m | 8:57AM0.58m | 9:51PM1.18m | 9:51AM0.47m | 10:27PM1.07m | ||||||||
 |  |  | |  |  | | | | | | | | | | | | | | | |
 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — |
 | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — |
mm | 1 | 1 | — | 2 | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 29 | 28 | 26 | 30 | 29 | 26 | 30 | 29 | 26 | 30 | 30 | 26 | 30 | 30 | 26 | 30 | 29 | 26 |
Feels °C | 30 | 31 | 33 | 32 | 31 | 33 | 33 | 30 | 33 | 32 | 30 | 33 | 33 | 30 | 33 | 33 | 31 | 34 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 8 | ESE 8 | SE 10 | ESE 7 | ESE 7 | S 8 | S 9 | S 9 | S 10 | S 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SE 10 | SW 9 |
| kJ | 28 | 69 | 56 | 26 | 29 | 18 | 21 | 99 | 101 | 190 | 173 | 141 | 149 | 116 | 90 | 88 | 86 | 70 | 49 | 90 |
Swell 2 Height (m) Direction Period (s) | SSW 8 | SE 10 | SE 10 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 11 | S 11 | ESE 11 | SE 11 | ESE 10 | SE 10 | ESE 10 | ESE 11 | SE 11 | ESE 11 | SE 10 | E 12 | SE 9 |
| kJ | 11 | 27 | 26 | 11 | 25 | 25 | 25 | 29 | 62 | 44 | 29 | 43 | 17 | 10 | 40 | 30 | 40 | 35 | 12 | 21 |
Swell 3 Height (m) Direction Period (s) | ESE 8 | SSW 8 | SSW 8 | SW 9 | SSW 8 | S 8 | ESE 7 | ESE 7 | ESE 11 | E 6 | E 6 | ESE 6 | E 10 | ESE 13 | SSE 10 | SSE 9 | SSE 10 | ESE 12 | SE 5 | ESE 10 |
| kJ | 13 | 11 | 11 | 3 | 6 | 12 | 9 | 5 | 45 | 3 | 3 | 4 | 8 | 17 | 9 | 9 | 9 | 29 | 1 | 20 |
Wind waves Height (m) Direction Period (s) | SE 5 | — | — | ESE 8 | — | — | — | — | — | — | SW 3 | — | — | SW 3 | — | SSW 3 | SW 3 | — | SSW 9 | SW 3 |
| kJ | 36 | — | — | 51 | — | — | — | — | — | — | 2 | — | — | 1 | — | 1 | 1 | — | 94 | 5 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 11 | 11 | 19 | 11 | 1 | 1 | 30 | 2 | 0 | 11 | 2 | 0 | 19 | 2 | 0 | 19 | 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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