
Surf Forecasts:
Asakawa surf forecast from 30 Jul 2026:
- Best quality surf: Wednesday 5 Aug, 3PM (local time) - 20ft (6.0m), 18s period, SE swell with cross-shore winds.
- Most powerful swell: Thursday 6 Aug, 6AM (local time) - 26ft (8.0m), 18s period, SE swell with 38,513 kJ wave energy.
- Next surfable swell (1★+): Saturday 1 Aug, 9PM (local time) - 1.5ft (0.4m), 11s 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 Saturday (Aug 01) at 9PM. The primary swell is predicted to be 0.2m and 18s period with a secondary swell of 0.4m and 11s. Another secondary swell of 0.3m and 5s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 8.0m 18s and forecast to arrive on Thursday (Aug 06) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Sunday (Aug 02) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 1st Aug) | 1.5ft (0.4m) 11s |
| Best Surf | 3PM (Wed 5th Aug) | 20ft (6.0m) 18s |
| Most Powerful | 6AM (Thu 6th Aug) | 26ft (8.0m) 18s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, let's have a look at what's cookin' for Asakawa over the next couple of weeks.
Well, it's a bit of a slow start, I won't lie to ya. The first few days are pretty flat and messy, with a tiny bit of south-east swell around 1 ft to 1 ft. The wind is light and glassy at times, but the energy is just not there – we're talkin' combined energy values of only 51 to 58, which is barely a ripple. You're better off waitin' it out.
The first real sign of life shows up on Sunday, August 2nd. The swell bumps up to 2 ft in the morning, then 4 ft in the afternoon from the ESE. The period is a juicy 16 to 18 seconds, so that's proper groundswell energy. The wind is a clean offshore, makin' for some tidy lines. The combined energy jumps to 579 on Sunday arvo, so it's startin' to have a bit of push. The water is a touch warmer than normal at 84°, so it's a nice tropical bath.
Now, Monday the 3rd sees the swell build further, reachin' 5 ft in the morning (900 energy) and then 6 ft in the afternoon (2014 energy). The period stays long at 15-17 seconds. But here's the rub: the wind turns onshore and cross-shore, and the surf quality gets a bit marginal. It's still got potential for the better surfers, but it's not the clean, easy pickin's we'd want.
The real standout – and I mean the one to circle on the calendar – is Wednesday, August 5th. The swell is pumpin' at 16 ft in the morning, hittin' 20 ft in the afternoon from the SE with a 18-second period. The combined energy is a massive 16,739 in the morning and 20,997 in the arvo. But, and it's a big but, the wind and tide are favorable, yet the forecast says the swell is just too big for this break. This is huge, monstrous swell. Only for the hardcore, experienced crew. The cross-shore wind is light, but at 20 ft, it's a beast for experts only.
Thursday the 6th is even bigger – 26 ft in the morning – but the wind gets stronger and more onshore, with storm risks. The combined energy hits over 51,000. Again, this is massive, dangerous stuff. Not for the faint of heart.
After that, the swell drops off quickly. Friday the 7th and Saturday the 8th are still sizeable (8 ft to 12 ft) but with onshore winds and choppy conditions. It's a bit of a mess.
There is a small window of hope on Sunday, August 9th, with a clean, glassy 4 ft swell from the south in the morning. The energy is 756, and the wind is glass. That's a nice, fun size for a longboard or a fish. But it's a short-lived window before it gets messy again.
Later in the week, from Wednesday the 12th to Thursday the 13th, we get another chance. The swell is 4 ft to 5 ft from the ESE, with very light winds, even dead calm on Thursday morning. The combined energy is around 843 to 943, and the period is 12 seconds – that's a nice, clean, workable swell. The water is still that warm tropical temp. That's a solid morning session for intermediate surfers.
The very end of the period, around August 14th and 15th, fades back to small, weak, onshore slop. Not worth gettin' wet for.
So, my call: if you're a seasoned charger, Wednesday the 5th and Thursday the 6th are the big-game days, but it's a serious, expert-only session. For the rest of us, circle Sunday morning the 9th, or the Wednesday and Thursday mornings of the 12th and 13th for the cleanest, most fun waves. The crowds at Asakawa can be an issue, but on those glassy mornings, it might be worth the company.
Rusty.
Short Range ForecastMostly dry. Warm (max 35°C on Sun afternoon, min 27°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Mon afternoon. Warm (max 31°C on Mon morning, min 26°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | |||||||||||||||
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) | SE 9 | SE 13 | SE 10 | SE 10 | SE 11 | ESE 16 | ESE 18 | ESE 16 | ESE 15 | ESE 15 | ESE 17 | ESE 17 | ESE 18 | ESE 18 | ESE 18 | SE 18 | SE 18 | SE 18 | SE 17 | SSE 16 | SSE 15 |
Wave Graph | |||||||||||||||||||||
24 | 26 | 23 | 28 | 29 | 98 | 174 | 568 | 612 | 867 | 1915 | 4013 | 5579 | 7952 | 11577 | 16739 | 20997 | 33796 | 37352 | 26873 | 17935 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | glassy | glassy | on | glassy | cross-off | cross-off | cross-off | cross | on | cross-on | cross-on | on | glassy | cross | cross | cross-off | cross | cross-on | cross |
High Tide | 7:36PM1.73m | 7:00AM1.77m | 8:00PM1.74m | 7:37AM1.73m | 8:25PM1.74m | 8:17AM1.67m | 8:51PM1.72m | 9:03AM1.58m | 9:19PM1.69m | 9:59AM1.47m | 9:52PM1.64m | 11:18AM1.36m | 10:35PM1.58m | ||||||||
Low Tide | 1:02PM0.16m | 1:15AM0.74m | 1:31PM0.21m | 1:47AM0.67m | 2:00PM0.31m | 2:22AM0.61m | 2:31PM0.44m | 3:01AM0.57m | 3:03PM0.60m | 3:47AM0.54m | 3:40PM0.78m | 4:44AM0.52m | 4:27PM0.97m | ||||||||
5:13 | — | — | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:16 | — | — | 5:16 | — | — | |
— | 7:04 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | |
mm | — | — | — | — | — | — | — | — | — | — | 3 | 4 | 1 | 1 | — | — | — | 1 | 2 | 4 | 24 |
Temp °C | 32 | 32 | 29 | 33 | 32 | 29 | 34 | 35 | 30 | 31 | 30 | 27 | 29 | 29 | 26 | 31 | 31 | 27 | 29 | 30 | 27 |
Feels °C | 35 | 36 | 33 | 36 | 35 | 33 | 37 | 38 | 35 | 35 | 35 | 32 | 32 | 32 | 30 | 33 | 33 | 30 | 31 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SE 9 | SE 9 | SE 10 | SE 10 | SE 11 | ESE 16 | ESE 18 | ESE 16 | ESE 15 | ESE 15 | ESE 17 | ESE 17 | ESE 18 | ESE 18 | ESE 18 | SE 18 | SE 18 | SE 18 | SE 17 | SSE 16 | SSE 15 |
23 | 23 | 23 | 28 | 29 | 98 | 174 | 568 | 612 | 867 | 1915 | 4013 | 5579 | 7952 | 11577 | 16739 | 20997 | 33796 | 37352 | 24517 | 14868 | |
Swell 2 Height (m) Direction Period (s) | SSW 5 | S 4 | SE 11 | SSW 4 | ESE 17 | SE 11 | ESE 14 | S 7 | SE 10 | SE 10 | S 8 | SE 14 | — | — | — | — | — | — | — | — | — |
4 | 1 | 20 | 2 | 28 | 29 | 120 | 4 | 15 | 15 | 5 | 8 | — | — | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | SE 12 | SE 13 | SSW 5 | S 7 | S 4 | ESE 19 | SE 9 | SSW 8 | SSW 8 | S 8 | S 8 | — | — | — | — | — | — | — | — | — | — |
24 | 26 | 2 | 1 | 1 | 35 | 41 | 7 | 6 | 5 | 4 | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | SW 5 | — | — | SW 5 | NE 3 | NE 4 | — | E 4 | ESE 6 | E 6 | — | E 7 | — | — | — | — | — | SSE 16 | SSE 15 |
— | — | 9 | — | — | 3 | 4 | 6 | — | 13 | 90 | 202 | — | 447 | — | — | — | — | — | 26873 | 17935 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 22 | 1 | 369 | 433 | 0 | 0 | 0 | 0 | 22 | 19 | 1 | 19 | 43 | 0 | 57 | 475 | 57 | 459 | 475 | 473 |
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.











