Surf Forecasts:
Asakawa surf forecast from 2 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 9AM (local time) - 18ft (5.5m), 12s period, SE swell with glassy winds.
- Most powerful swell: Wednesday 9 Sep, 9AM (local time) - 18ft (5.5m), 12s period, SE swell with 8,612 kJ wave energy.
- Next surfable swell (1★+): Wednesday 2 Sep, 9PM (local time) - 3.5ft (1.0m), 9s 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 Wednesday (Sep 02) at 9PM. The primary swell is predicted to be 1.0m and 9s period with a secondary swell of 0.5m and 11s. Another secondary swell of 0.4m and 5s 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 5.5m 12s and forecast to arrive on Wednesday (Sep 09) at 9AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Friday (Sep 04) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 2nd Sep) | 3.5ft (1.0m) 9s |
| Best Surf | 9AM (Wed 9th Sep) | 18ft (5.5m) 12s |
| Most Powerful | 9AM (Wed 9th Sep) | 18ft (5.5m) 12s |
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 Asakawa has in store for us over the next couple of weeks.
It's gonna be a game of patience with this spot. The first week is a bit of a mixed bag, with only small windows of decent surf. The water temp is a touch warmer than normal for this time of year, coming in at 84°, which is pretty pleasant.
Wednesday morning the 2nd is our starting point. We get a nice little SSE groundswell at 4ft with a 9-second period. The real beauty here is the glassy conditions with barely a whisper of wind, so it'll be clean as a whistle. Wave energy is weak (267), but for a small, clean day, it's a nice way to ease into the forecast.
Friday the 4th sees a pulse of S swell build to 6ft on the morning, with moderate wave energy (520). The wind is cross-offshore, keeping things clean. It's not going to be pumping, but it's surfable. Saturday dips again, but Sunday morning the 6th is worth a mention: a 6ft ESE swell with moderate energy and clean conditions. Get on it early, because Sunday afternoon gets big and messy with a 10ft E swell that is more for experts only, with strong wave energy (2219).
We hit a real rough patch Monday and Tuesday the 7th and 8th. The wind is cross-shore and messy, with rain and wave heights in the 4ft to 8ft range. It's just not worth paddling out for the average surfer. For the kite surfers out there, that Tuesday afternoon swell with 8ft and a cross-off breeze might be more interesting than paddle surfing.
Now, let's talk about the standout. Wednesday the 9th of September is our star. We have a massive 18ft SSE groundswell with a very long 12-second period. The combined wave energy is screaming at 8612, so this is for *expert surfers only*. If you have to ask if you should be out there, you probably shouldn't. The morning will be glassy before a light cross-shore creeps in for the afternoon. This is a big, heavy, powerful swell.
The rest of that second week is a letdown after that big day. Thursday the 10th still has some solid 12ft leftovers with glassy conditions in the morning, good for experienced surfers, but it's a step down. From the 11th through the 15th, it's mostly small and weak, with messy winds and poor conditions. A rare highlight is the morning of Friday the 11th with a clean 6ft S swell, but it’s over quickly.
Looking at the very end of the run, around the 16th and 17th of September, another big pulse arrives. Wednesday the 16th has a 13ft SSE swell (5781 energy) and then Thursday the 17th brings a clean, glassy 16ft S swell (4878 energy). These are huge, powerful days, great for experienced surfers, but remember it's far out so keep an eye on the charts. Asakawa is an inconsistent spot that needs the right angle, so when it lines up like this, it can be very special, but the crowds are possible.
Keep the faith, the end of the run looks promising.
- Rusty
Short Range ForecastHeavy rain (total 181mm), heaviest during Thu night. Warm (max 30°C on Wed morning, min 21°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 244mm), heaviest during Mon night. Warm (max 28°C on Sat morning, min 23°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | |||||||||||||||
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) | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 10 | S 10 | S 9 | S 9 | ESE 7 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | E 9 | ESE 8 | ESE 7 | ESE 7 | ESE 7 | SSE 11 | SE 10 | SE 12 |
Wave Graph | |||||||||||||||||||||
189 | 206 | 164 | 157 | 255 | 499 | 484 | 355 | 177 | 174 | 313 | 356 | 397 | 1555 | 250 | 138 | 248 | 362 | 656 | 1275 | 5048 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross-off | cross | cross-off | on |
High Tide | 8:30PM1.72m | 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 | 2:32PM0.75m | 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 | ||||||||
5:35 | — | — | 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 | 1 | — | 12 | 7 | 11 | 46 | 25 | 48 | 31 | — | — | 2 | — | 4 | 37 | 23 | 56 | 122 | 77 | 35 | 13 |
Temp °C | 30 | 30 | 27 | 25 | 24 | 24 | 24 | 22 | 22 | 28 | 28 | 23 | 25 | 24 | 24 | 24 | 24 | 24 | 26 | 26 | 27 |
Feels °C | 33 | 34 | 32 | 29 | 27 | 26 | 26 | 23 | 23 | 27 | 27 | 24 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 10 | S 10 | S 9 | S 9 | ESE 7 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 7 | SSW 8 | SSW 8 | SSE 11 | SE 10 | SSW 9 |
189 | 206 | 164 | 157 | 255 | 499 | 484 | 355 | 177 | 174 | 313 | 356 | 397 | 618 | 250 | 138 | 41 | 22 | 656 | 1275 | 8 | |
Swell 2 Height (m) Direction Period (s) | E 11 | E 11 | ESE 11 | ESE 10 | ESE 10 | ESE 10 | ESE 6 | ESE 7 | SSW 9 | S 8 | SSW 8 | SSW 8 | S 7 | SSW 9 | SSW 9 | SSW 8 | ESE 11 | — | SSW 10 | SSW 10 | — |
61 | 58 | 37 | 33 | 33 | 18 | 29 | 70 | 90 | 58 | 112 | 99 | 24 | 46 | 26 | 24 | 12 | — | 10 | 9 | — | |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 11 | SE 11 | SE 10 | SE 10 | SE 10 | E 9 | — | S 8 | SSW 8 | — | — | SW 9 | — | SE 7 | ESE 11 | ESE 11 | — | — | — | — |
17 | 18 | 18 | 16 | 15 | 16 | 7 | — | 66 | 48 | — | — | 22 | — | 9 | 12 | 12 | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | ESE 4 | E 4 | NNE 3 | NNE 4 | NNE 4 | NE 5 | — | NNE 4 | NNE 4 | — | — | E 9 | NNE 3 | NNE 3 | ESE 7 | ESE 7 | ESE 7 | E 7 | SE 12 |
— | — | 27 | 11 | 3 | 35 | 34 | 86 | — | 18 | 19 | — | — | 1555 | 3 | 5 | 248 | 362 | 293 | 671 | 5048 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 19 | 11 | 0 | 0 | 0 | 43 | 0 | 0 | 43 | 43 | 0 | 0 | 1 | 43 | 22 | 43 | 575 | 43 | 22 | 11 |
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.











