Surf Forecasts:
Asakawa surf forecast from 2 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 9PM (local time) - 15ft (4.5m), 12s period, SE swell with glassy winds.
- Most powerful swell: Tuesday 8 Sep, 9PM (local time) - 15ft (4.5m), 12s period, SE swell with 5,334 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 3AM (local time) - 3.5ft (1.1m), 8s period with SSE 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 Thursday (Sep 03) at 3AM. The primary swell is predicted to be 1.1m 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 4.5m 12s and forecast to arrive on Tuesday (Sep 08) at 9PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Friday (Sep 04) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 3rd Sep) | 3.5ft (1.1m) 8s |
| Best Surf | 9PM (Tue 8th Sep) | 15ft (4.5m) 12s |
| Most Powerful | 9PM (Tue 8th Sep) | 15ft (4.5m) 12s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at the next 16 days for Asakawa. We’ve got a bit of a slow start, but things are looking to get pretty interesting if you’re patient.
The first few days are a bit of a write-off, honestly. We’re looking at Thursday (3rd) through Sunday (6th) with some messy conditions and onshore winds. The swell is there, but it’s not doing us any favours with the wind howling from the NNE. Friday morning sees a 1.5m (5ft) south swell, but it’s getting hammered by a 12 mph cross-offshore wind, making it a tough session.
Things start to get a pulse on Sunday afternoon (6th) with a 2.4m (8ft) ESE swell and a 9 mph cross-offshore, and the energy is ramping up (722). The real standout, though, is shaping up for Tuesday (8th). We’ve got a solid 3.0m (10ft) SE swell rolling in, and by the afternoon, the wind goes glassy with a 3 mph easterly. The combined energy is a massive 1915, and the report says it’s excellent for experienced surfers. This is a big one for the experts, but it’s a serious wave.
Then, Wednesday (9th) morning keeps the quality going with a 3.0m (10ft) swell from the SE, period of 11 seconds, and a clean 6 mph cross-offshore. The energy is huge at 2164. This is a prime window for the more experienced crew at Asakawa.
After that, the swell backs off a touch through the 10th and 11th, but there’s a nice little window on Sunday (13th) morning. It’s a smaller 0.9m (3ft) SSE swell, but the wind is glassy, and the energy is a moderate 306. It’s clean and calm, a good one for a relaxed session.
The real, long-range promise comes on Thursday (17th) afternoon. The swell is a 1.4m (5ft) from the SE with a very long period of 14 seconds, and it’s glassy calm. The energy is 1510, and it’s called excellent for experienced surfers. That long period means it’s a groundswell, so it’ll be powerful and have good shape, but it’s a point break setup, so it should handle that energy well.
Then to wrap it up, Friday (18th) morning keeps the party going with a 2.1m (7ft) SE swell, 12-second period, and a clean cross-offshore breeze. The energy is 1911 again. It’s a great way to close out the window.
So, to sum it up: the first week is a bit of a struggle, but don’t give up. The best bets are Tuesday (8th) afternoon and Wednesday (9th) morning for the big, powerful stuff, and then the long-range promise of Thursday (17th) afternoon looks like a real gem. Get out there if you’re prepared for it.
Rusty out.
Short Range ForecastHeavy rain (total 186mm), heaviest during Fri afternoon. Warm (max 28°C on Thu afternoon, min 21°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 126mm), heaviest during Tue morning. Warm (max 27°C on Mon afternoon, min 24°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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) | SSE 8 | SSE 8 | SSE 10 | S 10 | S 10 | S 10 | S 9 | ESE 9 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 7 | SE 7 | SE 8 | SSE 11 | SE 10 | SE 10 | SE 12 |
Wave Graph  | |||||||||||||||||||
 kJ | 164 | 157 | 250 | 400 | 452 | 432 | 230 | 162 | 291 | 463 | 744 | 654 | 285 | 305 | 435 | 2479 | 1572 | 1915 | 4622 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | glassy | glassy |
High Tide | 9:51AM1.47m | 9:02PM1.65m | 11:18AM1.35m | 9:43PM1.56m | 1:51PM1.33m | 11:00PM1.46m | 3:35PM1.46m | 1:17AM1.44m | 4:19PM1.58m | 2:54AM1.54m | 4:52PM1.68m | ||||||||
Low Tide | 3:16AM0.36m | 3:06PM0.93m | 4:13AM0.42m | 3:51PM1.11m | 5:37AM0.48m | 5:35PM1.26m | 7:28AM0.46m | 8:34PM1.23m | 8:55AM0.35m | 9:45PM1.08m | 9:55AM0.25m | 10:28PM0.91m | |||||||
 |  |  |  |  | |  | |  | | | | | | | | | | | |
 | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — |
 | 6:28 | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — |
mm | 4 | 6 | 1 | 3 | 49 | 54 | 48 | 17 | 4 | 11 | 10 | 12 | 17 | 10 | 11 | 31 | 16 | 8 | 3 |
Temp °C | 26 | 26 | 28 | 24 | 23 | 22 | 22 | 23 | 24 | 24 | 24 | 24 | 24 | 26 | 27 | 27 | 27 | 27 | 27 |
Feels °C | 31 | 32 | 31 | 26 | 24 | 22 | 23 | 24 | 25 | 26 | 26 | 27 | 26 | 30 | 32 | 31 | 32 | 33 | 34 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SSE 10 | S 10 | S 10 | S 10 | S 9 | ESE 9 | ESE 8 | ESE 8 | SSW 9 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SSE 10 | — | — | SE 12 |
| kJ | 164 | 157 | 250 | 400 | 452 | 432 | 230 | 162 | 291 | 463 | 61 | 62 | 42 | 40 | 40 | 2129 | — | — | 4622 |
Swell 2 Height (m) Direction Period (s) | ESE 11 | ESE 10 | ESE 10 | ESE 10 | SE 10 | ESE 6 | ESE 8 | S 8 | SSW 9 | SSW 8 | — | SE 12 | — | ESE 11 | ESE 11 | — | — | — | — |
| kJ | 37 | 33 | 33 | 18 | 14 | 20 | 144 | 64 | 108 | 73 | — | 6 | — | 12 | 12 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 10 | SE 10 | SE 10 | ESE 9 | SE 9 | E 15 | SW 9 | — | — | — | — | — | ESE 11 | — | — | — | — | — |
| kJ | 18 | 16 | 15 | 14 | 17 | 13 | 4 | 42 | — | — | — | — | — | 12 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | E 4 | — | — | NE 4 | NE 4 | NNE 5 | NE 4 | NE 4 | NNE 4 | — | ESE 8 | ESE 8 | ESE 7 | SE 7 | SE 8 | SSE 11 | SE 10 | SE 10 | — |
| kJ | 9 | — | — | 12 | 44 | 74 | 4 | 14 | 5 | — | 744 | 654 | 285 | 305 | 435 | 2479 | 1572 | 1915 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 43 | 57 | 0 | 43 | 22 | 0 | 22 | 0 | 0 | 0 | 285 | 57 | 43 | 0 | 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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