Surf Forecasts:
Asakawa surf forecast from 28 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 12AM (local time) - 4.5ft (1.4m), 10s period, SSE swell with glassy winds.
- Most powerful swell: Wednesday 2 Sep, 6PM (local time) - 10ft (3.0m), 10s period, S swell with 1,853 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 9PM (local time) - 2ft (0.6m), 7s 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 29) at 9PM. The primary swell is predicted to be 0.6m and 7s period with a secondary swell of 0.3m and 11s. Another secondary swell of 0.6m and 4s 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 3.0m 10s and forecast to arrive on Wednesday (Sep 02) at 6PM. 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 29th Aug) | 2ft (0.6m) 7s |
| Best Surf | 12AM (Tue 1st Sep) | 4.5ft (1.4m) 10s |
| Most Powerful | 6PM (Wed 2nd Sep) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the table for Asakawa over the next couple of weeks.
Right off the bat, we’ve got a rough stretch ahead. The first week is a total write-off for any decent paddle surfing. The wind is almost always cross-onshore or onshore, and the guidance tells me Asakawa is an inconsistent point break that needs a clean offshore to really fire. From Friday the 28th of August right through to Saturday the 5th of September, the conditions are just poor. Swell is small and weak, with the combined wave energy barely cracking 100 (97) on the Sunday morning, though that morning does go glassy with a clean 2ft S swell. But it’s just too small to get excited about. There’s a long gap here with no real recommendations.
Now, hold on to your board shorts because things shift in the second week. Sunday the 6th of September is where it starts to get interesting. The morning kicks off with a glassy cross-offshore wind from the NNE, light at 6 mph, and a clean 3ft S groundswell with a very long period of 14 seconds. The combined energy jumps to 1037 – that’s moderate to strong energy. This is a point break, so that long period swell will wrap in beautifully and produce well-shaped, lined-up waves. The afternoon is even better: the swell pumps up to 8ft from the SSE, period still solid at 13 seconds, and the combined energy is a massive 2975. Winds stay clean and cross-offshore. This is excellent, powerful surf, but at 8ft it’s pushing into expert territory. This is the standout of the whole forecast.
Monday the 7th sees the swell dropping back and the wind turning a bit lumpy, so it’s more marginal. But then look at Saturday the 12th of September. The morning is absolutely glassy – dead calm, 0 mph wind – with a massive 13ft SE groundswell riding a very long 14-second period. The combined energy is a monstrous 8089. This is exceptional surf, but only for the most experienced crew. That kind of size and power at a point break means it will be a heavy, challenging paddle. If you’re not a pro, sit this one out. The afternoon drops slightly to 12ft but gets a cross-onshore bump, so the morning window is your golden ticket.
Overall, this is a tale of two weeks. The first six to seven days are a complete bust. The second week delivers a couple of absolute gems, with Sunday the 6th and Saturday the 12th being the clear standouts, though the 12th is strictly for experts.
Stay stoked, and keep an eye on that forecast.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Sun morning. Warm (max 31°C on Fri morning, min 24°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 78mm), heaviest during Tue afternoon. Warm (max 30°C on Mon afternoon, min 26°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | |||||||||||||||
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) | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 8 | S 7 | S 7 | S 7 | S 11 | S 10 | SSE 10 | SSE 9 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | S 10 | S 10 | S 10 |
Wave Graph | |||||||||||||||||||||
105 | 116 | 73 | 110 | 117 | 75 | 54 | 39 | 37 | 185 | 230 | 386 | 605 | 795 | 943 | 1322 | 1618 | 1452 | 1360 | 878 | 716 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross-on | cross | glassy | cross-on | cross | glassy | on | glassy | cross-on | on | on | on | on | on | on | cross-on | cross-on |
High Tide | 6:30PM1.78m | 6:12AM1.83m | 6:52PM1.81m | 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 | ||||||||
Low Tide | 12:05PM0.20m | 00:18AM0.60m | 12:33PM0.23m | 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 | ||||||||
5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — | |
— | 6:34 | — | — | 6:32 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:25 | — | |
mm | 1 | 2 | — | — | 1 | — | 2 | 3 | — | — | 1 | 6 | 8 | 12 | 16 | 8 | 10 | 17 | 19 | 11 | 7 |
Temp °C | 31 | 31 | 27 | 31 | 30 | 27 | 29 | 29 | 26 | 29 | 30 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 |
Feels °C | 34 | 35 | 31 | 34 | 33 | 32 | 34 | 33 | 30 | 32 | 33 | 32 | 30 | 29 | 29 | 29 | 29 | 29 | 27 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SSE 7 | S 7 | SSE 9 | SE 11 | S 7 | S 7 | S 7 | S 11 | S 10 | SSE 10 | SSE 9 | ESE 12 | E 11 | ESE 11 | SSE 10 | ESE 10 | SSE 10 | S 10 | S 10 |
78 | 64 | 21 | 54 | 8 | 19 | 54 | 39 | 37 | 185 | 230 | 386 | 605 | 50 | 66 | 39 | 1618 | 36 | 1086 | 878 | 716 | |
Swell 2 Height (m) Direction Period (s) | SE 10 | SSE 10 | SSE 9 | SE 9 | ESE 9 | ESE 9 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 12 | — | — | — | ESE 11 | E 16 | ESE 10 | SW 12 | ESE 8 |
15 | 10 | 9 | 13 | 8 | 8 | 27 | 36 | 37 | 25 | 35 | 23 | 31 | — | — | — | 39 | 5 | 33 | 37 | 35 | |
Swell 3 Height (m) Direction Period (s) | ESE 11 | E 11 | ESE 8 | E 10 | SE 13 | SSE 9 | ESE 10 | SW 11 | SW 9 | SW 11 | SSW 10 | E 13 | E 10 | — | — | — | — | — | E 15 | ESE 10 | SSW 11 |
23 | 9 | 7 | 7 | 7 | 8 | 9 | 4 | 3 | 5 | 10 | 14 | 8 | — | — | — | — | — | 4 | 18 | 24 | |
Wind waves Height (m) Direction Period (s) | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 7 | SSW 8 | SW 4 | SW 3 | SW 3 | — | — | ESE 4 | — | SSE 10 | SSE 10 | SSE 10 | — | SSE 10 | S 10 | — | — |
105 | 116 | 73 | 110 | 117 | 75 | 7 | 2 | 2 | — | — | 19 | — | 795 | 943 | 1322 | — | 1452 | 1360 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 11 | 2 | 2 | 14 | 2 | 0 | 11 | 2 | 0 | 433 | 0 | 473 | 581 | 435 | 369 | 433 | 370 | 433 | 963 | 339 |
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.











