Surf Forecasts:
Asakawa surf forecast from 29 Aug 2026:
- Best quality surf: Sunday 30 Aug, 6AM (local time) - 4ft (1.2m), 7s period, SW swell with glassy winds.
- Most powerful swell: Sunday 6 Sep, 3AM (local time) - 10ft (3.0m), 9s period, ESE swell with 1,346 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 6AM (local time) - 4ft (1.2m), 7s period with SW 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 30) at 6AM. The primary swell is predicted to be 1.2m and 7s period with a secondary swell of 0.8m and 7s. Another secondary swell of 0.4m and 11s 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 3.0m 9s and forecast to arrive on Sunday (Sep 06) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Friday (Sep 04) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sun 30th Aug) | 4ft (1.2m) 7s |
| Best Surf | 6AM (Sun 30th Aug) | 4ft (1.2m) 7s |
| Most Powerful | 3AM (Sun 6th Sep) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
G’day, I’m Rusty. Let’s have a look at what’s heading our way for Asakawa over the next couple of weeks.
Right now, the surf is small and uninspiring. We’re looking at a bit of a lull to kick things off. Sunday morning the 30th of August has some small 4ft swell from the SW, period around 8 seconds, and the combined energy is weak (225). The wind is glassy, so it’s clean, but honestly, it’s pretty ordinary. It’s not going to get you excited. The water temperature is about average for this time of year.
From Sunday afternoon right through to the 4th of September, it’s a real slog. Swell drops below 3ft, periods are all over the place, and the wind is mostly onshore or cross-on. The combined energy stays low (under 200 most of the time). This is a stretch of days with no real surf to recommend – a quiet run that’s pretty normal for the area when the swell windows don’t line up.
Then we get a bit of a pulse on Saturday the 5th of September. The morning shows 6ft from the ESE, period 8 seconds, and the combined energy jumps to 543 – moderate. The wind is cross-off from the NNE, so it’s clean. But it’s still only a marginal call, and the afternoon gets bigger at 8ft, but with cross-on wind. Not the best, but if you’re desperate, the Saturday morning might be worth a look.
The real standout, and I mean the one you circle on the calendar, is the weekend of the 12th and 13th of September. Starting Saturday the 12th, we’ve got a solid 10ft swell from the S, with a very long period of 16 seconds. The combined energy is massive (6546) – strong to very strong. That’s proper groundswell. The wind is cross-off in the morning, turning glassy in the afternoon. This is excellent surf for experienced surfers. The long period means it’ll be a bit straight at Asakawa, which is a point break, so it should hold up well and offer some nice lines. Expect big, powerful sets with long gaps between them – makes paddling out easier, but you need to know what you’re doing.
Sunday the 13th keeps it going with 12ft from the S, also 16 seconds, and glassy conditions in the morning. The energy is even higher (6578). This is the best of the bunch. Short period? No, this is 16 seconds – that’s as long as it gets. The wind is glassy, so it’ll be clean as a whistle. It’s a big swell, over 8ft, so this is experts only. It’s also a point break, so the long period groundswell will wrap in nicely.
Monday the 14th of September still has 10ft from the S, period 12 seconds, with cross-off wind and clean conditions. Energy is still high (2599). It’s a step down from the weekend but still a solid option.
The earlier pulse on the 5th of September is the only other thing worth a mention, but it’s nowhere near the quality of that second weekend. The 12th and 13th are the true standouts. Keep an eye on the long-range forecast, as it’s a bit more than a week away, so there’s some uncertainty, but the signs are promising.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Sun afternoon. Warm (max 31°C on Mon morning, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Thu night. Warm (max 30°C on Wed morning, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | ||||||||||||||
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 7 | SW 8 | SSW 7 | SSW 7 | S 9 | S 8 | SE 10 | ESE 13 | E 12 | S 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSW 11 | SE 8 | ESE 8 | SE 7 |
Wave Graph | |||||||||||||||||||
97 | 129 | 55 | 76 | 73 | 51 | 31 | 59 | 80 | 118 | 137 | 192 | 175 | 88 | 64 | 81 | 100 | 90 | 109 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross-on | cross-off | on | cross-on | cross | on | on | glassy | on | on | glassy | glassy | cross-on | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:48AM1.84m | 7:14PM1.82m | 7:26AM1.80m | 7:38PM1.81m | 8:07AM1.73m | 8:03PM1.78m | 8:53AM1.61m | 8:30PM1.72m | 9:51AM1.47m | 9:02PM1.65m | 11:18AM1.35m | 9:43PM1.56m | |||||||
Low Tide | 00:48AM0.49m | 1:02PM0.31m | 1:19AM0.40m | 1:31PM0.43m | 1:53AM0.35m | 2:01PM0.58m | 2:31AM0.33m | 2:32PM0.75m | 3:16AM0.36m | 3:06PM0.93m | 4:13AM0.42m | 3:51PM1.11m | |||||||
— | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | |
6:32 | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:25 | — | — | 6:24 | — | |
mm | — | 1 | 3 | 2 | 1 | — | — | — | — | — | — | — | 2 | 1 | 2 | 3 | — | — | — |
Temp °C | 27 | 30 | 30 | 27 | 31 | 30 | 26 | 30 | 30 | 26 | 30 | 30 | 26 | 29 | 28 | 26 | 27 | 26 | 24 |
Feels °C | 31 | 36 | 34 | 32 | 34 | 33 | 30 | 32 | 33 | 31 | 33 | 33 | 32 | 32 | 32 | 31 | 27 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | S 7 | SE 10 | S 7 | S 9 | S 8 | S 8 | S 8 | S 8 | S 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | ESE 8 | SE 8 | ESE 8 | SE 7 |
97 | 70 | 37 | 38 | 73 | 51 | 31 | 33 | 57 | 118 | 137 | 192 | 175 | 88 | 64 | 73 | 100 | 90 | 109 | |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 10 | SW 11 | SE 10 | SE 10 | SE 10 | SSW 9 | ESE 13 | E 12 | E 12 | E 11 | E 11 | E 10 | E 10 | ESE 9 | SSW 11 | SSW 11 | SSW 10 | S 9 |
19 | 17 | 4 | 38 | 25 | 25 | 31 | 59 | 80 | 70 | 61 | 58 | 56 | 51 | 44 | 81 | 76 | 41 | 24 | |
Swell 3 Height (m) Direction Period (s) | ESE 9 | ESE 10 | E 11 | SW 9 | E 10 | SSW 10 | SE 10 | SE 9 | SE 9 | SE 9 | SE 10 | SE 11 | SE 10 | SW 11 | SSW 10 | S 7 | SSE 7 | SSE 8 | SW 10 |
8 | 9 | 2 | 3 | 2 | 10 | 23 | 22 | 22 | 14 | 14 | 18 | 17 | 29 | 40 | 26 | 18 | 19 | 26 | |
Wind waves Height (m) Direction Period (s) | SW 5 | SW 8 | SSW 7 | SSW 7 | SW 4 | SSW 2 | — | SSE 3 | — | ENE 6 | E 6 | — | — | — | — | — | NNE 4 | NE 4 | NE 4 |
74 | 129 | 55 | 76 | 6 | 1 | — | 1 | — | 12 | 2 | — | — | — | — | — | 28 | 34 | 9 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 19 | 0 | 11 | 30 | 2 | 11 | 11 | 0 | 14 | 19 | 0 | 0 | 43 | 0 | 14 | 43 | 22 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











