
Surf Forecasts:
Asakawa surf forecast from 6 Sep 2026:
- Best quality surf: Monday 7 Sep, 3AM (local time) - 6ft (1.9m), 10s period, SE swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 3AM (local time) - 8ft (2.5m), 9s period, SSE swell with 1,012 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 12AM (local time) - 6ft (1.9m), 9s 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 Monday (Sep 07) at 12AM. The primary swell is predicted to be 1.9m and 9s period with a secondary swell of 0.3m and 9s. 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 2.5m 9s and forecast to arrive on Wednesday (Sep 09) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Monday (Sep 07) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Mon 7th Sep) | 6ft (1.9m) 9s |
| Best Surf | 3AM (Mon 7th Sep) | 6ft (1.9m) 10s |
| Most Powerful | 3AM (Wed 9th Sep) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break this one down.
The spot we’re looking at is Asakawa, a point break that doesn’t fire all the time – it’s inconsistent, so you gotta pick your moments. Water temp’s about 84°, which is a touch warmer than normal for this time of year, so that’s a nice little bonus.
The run starts Sunday the 6th with chest-high waves around 6ft from the ESE. A moderate cross-off breeze is blowing, and the combined energy is moderate at 735. Not terrible, but not the best.
Monday the 7th is a bit better. Morning waves are waist-to-chest high at 5ft from the SE, with a lighter cross-off wind. The afternoon pushes up to about 6ft, still cross-off and cleaner. Combined energy sits at 491 and 600. Surfable, but nothing special.
Tuesday the 8th hangs in that waist-to-chest range, 4ft to 5ft, light cross-off winds, moderate energy. It’s okay, but you’re not racing to the water.
Now, here’s the one true standout for the whole 16 days. Wednesday the 9th, first light. The wind goes dead calm, glassy, from the SSW. The swell bumps up to a solid 7ft from the SSE, with moderate-to-strong combined energy at 698. That’s the session – clean, glassy, and the point should be working real nice. The afternoon drops to 5ft with a cross-off breeze, still okay, but the morning is the clear winner.
After that, it’s a slow slide downhill. Thursday the 10th drops to 4ft with ordinary conditions. Friday the 11th and Saturday the 12th are barely surfable – waves under 3ft and weak energy readings around 90 to 111. Not worth paddling out.
Sunday the 13th offers a tiny glassy moment with waves around 2ft from the S, period stretching to 10 seconds, giving a combined energy of 220. It’s small and very ordinary.
From Monday the 14th all the way through to the 21st, it’s a long, slow fade. Waves stay mostly under 4ft, winds are messy or glassy but with no power behind the swell. Combined energy drops from 288 down to just 21. There’s a few glassy moments on the 16th and 17th, but with waves at 3ft and 2ft, you’re really just standing on the beach.
The only session worth getting excited about is the Wednesday 9th morning at Asakawa – glassy, 7ft from the SSE, solid energy. Everything else is small, inconsistent, or just not worth the effort. There’s a long gap of poor to flat surf from around the 13th onward, so don’t plan any trips for the second week.
Rusty.
Short Range ForecastHeavy rain (total 81mm), heaviest during Tue night. Warm (max 27°C on Tue morning, min 23°C on Sun afternoon). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Wed afternoon. Warm (max 29°C on Sat morning, min 23°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
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) | ESE 10 | SE 9 | SE 10 | SE 9 | SE 8 | SE 8 | S 9 | S 9 | SSE 9 | SSE 8 | SE 8 | SE 8 | SE 8 | SSE 7 | SSE 7 | SSE 7 | S 8 | S 8 | S 8 | S 11 |
Wave Graph | ||||||||||||||||||||
651 | 593 | 368 | 450 | 219 | 208 | 320 | 700 | 686 | 339 | 176 | 140 | 129 | 76 | 63 | 67 | 82 | 61 | 44 | 40 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | cross-off | cross-off | cross-off | cross | glassy | cross | cross-off | cross-off | cross-off | cross-on | glassy |
High Tide | 3:35PM1.46m | 1:17AM1.44m | 4:19PM1.58m | 2:54AM1.54m | 4:52PM1.68m | 3:59AM1.68m | 5:21PM1.76m | 4:49AM1.79m | 5:47PM1.81m | 5:34AM1.87m | 6:13PM1.84m | 6:15AM1.89m | 6:37PM1.84m | |||||||
Low Tide | 8:34PM1.23m | 8:55AM0.35m | 9:45PM1.08m | 9:55AM0.25m | 10:28PM0.91m | 10:41AM0.18m | 11:04PM0.73m | 11:20AM0.16m | 11:38PM0.57m | 11:55AM0.21m | 00:11AM0.43m | 12:27PM0.30m | 00:43AM0.33m | |||||||
— | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | |
6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | |
mm | 5 | 7 | 9 | 4 | 6 | 5 | 5 | 20 | 20 | 1 | 1 | 2 | — | — | 1 | 2 | — | — | — | — |
Temp °C | 23 | 24 | 25 | 25 | 24 | 27 | 26 | 27 | 27 | 26 | 25 | 24 | 25 | 24 | 26 | 27 | 25 | 29 | 28 | 25 |
Feels °C | 23 | 25 | 28 | 28 | 26 | 31 | 31 | 32 | 33 | 29 | 27 | 26 | 27 | 28 | 30 | 32 | 29 | 32 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | ESE 10 | SE 9 | SE 10 | SE 9 | SE 8 | SE 8 | S 9 | S 9 | SSE 9 | SSE 8 | SE 8 | SE 8 | SE 8 | SSE 7 | SSE 7 | SSE 7 | S 8 | S 8 | S 8 | S 7 |
651 | 593 | 368 | 450 | 219 | 208 | 320 | 700 | 686 | 339 | 176 | 140 | 129 | 76 | 63 | 67 | 82 | 61 | 44 | 27 | |
Swell 2 Height (m) Direction Period (s) | SSE 10 | SSW 9 | SSE 9 | S 11 | S 10 | S 9 | SE 8 | SE 8 | E 18 | E 18 | SSW 8 | E 16 | E 15 | SE 9 | SE 9 | SE 9 | ESE 10 | ESE 10 | SE 10 | ESE 9 |
75 | 15 | 232 | 37 | 161 | 207 | 151 | 154 | 6 | 6 | 23 | 5 | 4 | 22 | 22 | 22 | 19 | 19 | 24 | 34 | |
Swell 3 Height (m) Direction Period (s) | SSW 9 | SSW 8 | — | SW 10 | SSW 11 | SE 10 | SE 10 | ESE 10 | E 18 | — | E 16 | — | E 18 | E 15 | E 15 | E 14 | E 14 | E 13 | ESE 5 | S 11 |
9 | 14 | — | 4 | 47 | 26 | 26 | 40 | 6 | — | 5 | — | 6 | 17 | 17 | 15 | 36 | 31 | 5 | 40 | |
Wind waves Height (m) Direction Period (s) | NNE 4 | NNE 4 | NNE 4 | NE 4 | NNE 4 | NNE 4 | NNE 3 | NNE 4 | NNE 5 | NE 3 | NNE 5 | NNE 4 | NE 4 | — | — | NE 4 | NE 4 | NE 3 | E 5 | ESE 5 |
50 | 23 | 28 | 17 | 14 | 10 | 8 | 22 | 8 | 9 | 39 | 9 | 4 | — | — | 12 | 8 | 3 | 17 | 22 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 22 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 22 | 0 | 14 | 0 | 0 | 0 | 385 | 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.










