
Surf Forecasts:
Asakawa surf forecast from 10 Sep 2026:
- Best quality surf: Thursday 10 Sep, 9PM (local time) - 3.5ft (1.1m), 8s period, SE swell with cross-offshore winds.
- Most powerful swell: Tuesday 15 Sep, 6AM (local time) - 4ft (1.2m), 9s period, SE swell with 242 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 9PM (local time) - 3.5ft (1.1m), 8s 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 Thursday (Sep 10) at 9PM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.2m and 11s. 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 1.2m 9s and forecast to arrive on Tuesday (Sep 15) at 6AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Friday (Sep 11) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Thu 10th Sep) | 3.5ft (1.1m) 8s |
| Best Surf | 9PM (Thu 10th Sep) | 3.5ft (1.1m) 8s |
| Most Powerful | 6AM (Tue 15th Sep) | 4ft (1.2m) 9s |
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's got cooking for us over the next couple of weeks. It's a bit of a slow burn, but there's a real beast lurking in the long-range forecast.
Right off the bat, we've got to be honest: the next week or so is pretty flat and ordinary. From the 10th right through to the morning of the 18th, it's a long stretch of mushy, weak waves. The swell is tiny, mostly under 3 ft, and the period is short, so there's no real push behind it. The combined wave energy is barely flickering, mostly between 91 and 260 – that's weak energy, my friends. Winds are mostly light and cross-off or glassy, which would be great if there was any swell to use, but for a paddle, it's a write-off. Thursday the 19th has us looking at a massive jump, with the swell hitting 13 ft from the SE with a very long 17-second period. That's a lot of power, with combined energy at 9194, but the wind is cross-on, so conditions will be messy and the tide could be an issue. It's a big, dangerous wall of water for experts only.
Now, hold onto your board. The standout window is Sunday the 20th. This is the real deal. We're looking at a 16 ft to 18 ft SE groundswell, with a very long 16-second period. The combined energy is insane – hitting 12288 on the morning and then a whopping 15471 on the afternoon. That's very strong wave energy. The wind is forecast to be light and cross-off from the NNE, which will keep the faces clean. This is exceptional surf, but let's be clear: anything over 8 ft is expert territory, and this is double that. This is not for the faint-hearted or the inexperienced. For the seasoned charger, this is about as good as it gets at Asakawa (a point break, which handles these long period, SE swells beautifully). Expect the water to be a warm 82°F, which is about average for this time of year.
After that monster, the swell drops like a stone. By Monday the 21st, we're back to small, weak 3 ft to 3 ft waves, and by Tuesday the 22nd, a severe gale from the NNW makes paddling out a ridiculous idea. The end of the month looks like a return to the poor, tiny conditions we saw at the start.
So, if you're a beginner, the whole 16-day window is a bust for you. For the experts, don't even look at the first week. Your entire focus should be on that Sunday the 20th. It's a long way out, so keep an eye on the forecasts, but right now it's the only game in town, and it could be a session you'll never forget.
Rusty.
Short Range ForecastHeavy rain (total 28mm), heaviest during Thu night. Warm (max 28°C on Sun morning, min 22°C on Thu afternoon). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 35mm), heaviest during Tue afternoon. Warm (max 28°C on Sun afternoon, min 23°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Thu 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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 8 | SE 7 | SSE 8 | SSE 7 | S 7 | S 7 | S 7 | ESE 10 | SSE 7 | ESE 9 | SE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 |
Wave Graph | ||||||||||||||||||||
123 | 156 | 99 | 140 | 127 | 59 | 34 | 35 | 31 | 50 | 192 | 174 | 186 | 211 | 242 | 182 | 135 | 99 | 99 | 94 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross-off | cross-off | cross-off | cross-off | cross | glassy | glassy | on | on | on | on | cross-on | glassy | glassy | glassy | glassy | glassy | glassy |
High Tide | 5:47PM1.81m | 5:34AM1.87m | 6:13PM1.84m | 6:15AM1.89m | 6:37PM1.84m | 6:54AM1.85m | 7:00PM1.83m | 7:31AM1.78m | 7:22PM1.79m | 8:09AM1.67m | 7:43PM1.73m | 8:48AM1.54m | 8:04PM1.66m | |||||||
Low Tide | 11:38PM0.57m | 11:55AM0.21m | 00:11AM0.43m | 12:27PM0.30m | 00:43AM0.33m | 12:57PM0.43m | 1:15AM0.29m | 1:24PM0.57m | 1:46AM0.29m | 1:50PM0.72m | 2:19AM0.34m | 2:13PM0.87m | 2:54AM0.42m | |||||||
— | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — | 5:45 | — | — | |
6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:10 | — | — | 6:09 | — | — | 6:07 | — | |
mm | 5 | 10 | 2 | 1 | — | 3 | 2 | 4 | 1 | — | 6 | 2 | 1 | 9 | 5 | 9 | 1 | 2 | 4 | 2 |
Temp °C | 22 | 24 | 26 | 25 | 24 | 25 | 26 | 26 | 28 | 28 | 25 | 28 | 28 | 25 | 23 | 23 | 23 | 23 | 23 | 23 |
Feels °C | 24 | 28 | 30 | 28 | 27 | 29 | 31 | 31 | 32 | 32 | 30 | 32 | 32 | 29 | 27 | 27 | 27 | 26 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SE 7 | SSE 8 | SSE 7 | S 7 | S 7 | S 7 | ESE 4 | SSE 7 | ESE 9 | SE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 |
123 | 156 | 99 | 140 | 127 | 59 | 34 | 12 | 30 | 50 | 192 | 174 | 186 | 211 | 242 | 182 | 135 | 99 | 99 | 94 | |
Swell 2 Height (m) Direction Period (s) | E 15 | ESE 11 | ESE 7 | E 14 | ESE 10 | SE 10 | SE 10 | S 7 | ESE 9 | E 13 | E 13 | E 13 | E 12 | E 12 | S 6 | E 13 | E 13 | E 14 | E 12 | E 13 |
4 | 12 | 15 | 15 | 19 | 24 | 25 | 22 | 31 | 31 | 13 | 13 | 12 | 12 | 1 | 14 | 13 | 4 | 3 | 3 | |
Swell 3 Height (m) Direction Period (s) | E 18 | E 15 | E 15 | E 6 | E 14 | E 13 | E 14 | ESE 10 | E 13 | S 7 | S 7 | S 6 | S 7 | S 7 | E 15 | S 6 | S 7 | E 12 | S 6 | S 7 |
6 | 17 | 17 | 3 | 36 | 31 | 32 | 35 | 31 | 8 | 4 | 3 | 4 | 1 | 17 | 1 | 1 | 3 | 1 | 1 | |
Wind waves Height (m) Direction Period (s) | NE 3 | NNE 3 | NE 3 | NE 3 | NE 3 | NNE 3 | NE 3 | SE 4 | ESE 4 | SE 4 | — | — | — | — | — | — | NE 3 | NNE 3 | NE 3 | NE 3 |
6 | 1 | 2 | 5 | 3 | 3 | 3 | 27 | 5 | 16 | — | — | — | — | — | — | 3 | 3 | 2 | 4 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 19 | 0 | 0 | 369 | 11 | 14 | 11 | 2 | 0 | 0 | 0 | 0 | 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.










