
Surf Forecasts:
Asakawa surf forecast from 13 Sep 2026:
- Best quality surf: Saturday 19 Sep, 9PM (local time) - 13ft (4.0m), 13s period, ESE swell with cross-offshore winds.
- Most powerful swell: Saturday 19 Sep, 3PM (local time) - 15ft (4.5m), 14s period, ESE swell with 6,825 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 3AM (local time) - 3.5ft (1.0m), 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 Monday (Sep 14) at 3AM. The primary swell is predicted to be 1.0m and 8s period with a secondary swell of 0.3m and 13s. 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 14s and forecast to arrive on Saturday (Sep 19) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Sunday (Sep 20) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Mon 14th Sep) | 3.5ft (1.0m) 8s |
| Best Surf | 9PM (Sat 19th Sep) | 13ft (4.0m) 13s |
| Most Powerful | 3PM (Sat 19th Sep) | 15ft (4.5m) 14s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, this is Rusty comin' at ya. Let's have a look at what's on offer for this stretch of coast. It's a bit of a slow starter, but there's some real firepower brewing for the patient ones among us.
Right now, the first few days are pretty quiet. We're looking at a tiny, weak SE windswell, mostly below 3 ft and not doing much of anything. The water temp’s around 82°, which is a bit above average for this time of year, so the ocean’s got that warm bath feel to it. Don’t get too excited for the 13th or 14th – the swell energy is low, and the conditions are just ordinary. It’s a waiting game.
Things start to perk up a touch on Tuesday the 15th. Asakawa picks up some clean, glassy conditions in the morning with a small 4 ft SE swell. The energy is starting to build (290), and with zero wind, it'll look pretty tempting for a longboard or a funboard. But honestly, it's still small.
Now, the real story starts to unfold around Friday the 18th. The swell bumps up to 6 ft from the ESE with moderate energy (385), and we get some clean, cross-off winds. It’s a solid step up.
But hold onto your board, because Saturday the 19th is the standout. Asakawa is going to light up. We’re looking at a powerful 12 ft ESE groundswell with a long 15-second period, cranking the combined energy right up to 4985. That’s a serious jump. Morning sees clean cross-off winds, making for some excellent, powerful surf. This one is for experienced surfers only – this is not a beginner’s wave. The afternoon gets even bigger at 15 ft, but the wind swings more cross and the energy goes through the roof (12055), making it a bit more unruly. If you’re an expert, get on it early.
Sunday the 20th stays solid, with an 8 ft ESE swell and clean conditions. It’s still a big, powerful wave, but a touch more manageable than Saturday’s peak.
Heading into the second week, the run of solid swell continues. Monday the 21st has a big 10 ft S swell (energy over 3000) with glassy afternoon conditions. That’s another excellent day for the experienced crew.
Tuesday the 22nd sees the biggest number of the run – a 16 ft SSW swell, but the wind is onshore and the conditions are questionable. The raw power is there (6877 energy), but it might be a washing machine. The following days drop right off into tiny, blown-out junk by the 23rd.
There is a gap of a couple of days with no real recommendations before the pattern shifts again. From the 24th to the 28th, we get a long run of cleaner, more manageable conditions. A consistent 5 ft to 7 ft ESE swell rolls in with solid periods (10-12 seconds). The wind is mostly offshore or cross-off from the North, keeping the surface clean. The 27th and 28th are particularly good, with light winds, clean faces, and solid groundswell energy (over 1000). This is the payoff for the patient surfer. A 7 ft ESE groundswell on the 28th with glassy conditions? That’s a beautiful way to close out the forecast.
So, to wrap it up: the first week is a slow burner, but Saturday the 19th is the big, powerful highlight for experts. For those who want cleaner, more user-friendly waves without the massive size, the final stretch from the 24th to the 28th is your best bet.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Tue afternoon. Warm (max 29°C on Sun morning, min 23°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 40mm), heaviest during Thu night. Warm (max 26°C on Wed morning, min 23°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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) | ESE 9 | SE 9 | SE 9 | SE 8 | SE 8 | SE 10 | SE 9 | SE 9 | SE 9 | ESE 9 | SE 9 | ESE 9 | SE 9 | SE 9 | ESE 6 | ESE 8 | ESE 8 | ESE 16 | ESE 15 | ESE 14 | ESE 12 |
Wave Graph | |||||||||||||||||||||
32 | 83 | 145 | 135 | 142 | 235 | 272 | 237 | 155 | 138 | 110 | 96 | 77 | 75 | 158 | 383 | 270 | 1799 | 4985 | 6825 | 3823 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | on | glassy | cross-on | glassy | glassy | on | glassy | cross-off | glassy | glassy | glassy | cross-off | cross | cross-off | cross-off | glassy | cross-off | cross | cross-off |
High Tide | 7:00PM1.83m | 7:31AM1.78m | 7:22PM1.79m | 8:09AM1.67m | 7:43PM1.73m | 8:48AM1.54m | 8:04PM1.66m | 9:32AM1.40m | 8:24PM1.57m | 10:38AM1.28m | 8:45PM1.47m | 1:48PM1.23m | 9:10PM1.37m | ||||||||
Low Tide | 12:57PM0.43m | 1:15AM0.29m | 1:24PM0.57m | 1:46AM0.29m | 1:50PM0.72m | 2:19AM0.34m | 2:13PM0.87m | 2:54AM0.42m | 2:34PM1.00m | 3:36AM0.53m | 2:53PM1.12m | 4:39AM0.64m | 2:46PM1.23m | ||||||||
5:43 | — | — | 5:43 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | |
— | 6:13 | — | — | 6:10 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — | — | 6:04 | — | |
mm | 2 | — | 2 | 2 | — | 1 | 1 | 4 | 5 | 5 | 5 | 4 | 4 | 5 | 14 | — | 2 | 1 | — | 4 | 12 |
Temp °C | 29 | 29 | 26 | 28 | 28 | 24 | 27 | 27 | 24 | 26 | 26 | 24 | 26 | 26 | 24 | 26 | 26 | 25 | 27 | 26 | 23 |
Feels °C | 33 | 33 | 31 | 31 | 30 | 27 | 30 | 30 | 29 | 30 | 31 | 29 | 30 | 30 | 27 | 30 | 29 | 29 | 29 | 28 | 25 |
Swell 1 Height (m) Direction Period (s) | ESE 9 | SE 9 | SE 9 | SE 8 | SE 8 | SE 10 | SE 9 | SE 9 | SE 9 | ESE 9 | SE 9 | ESE 9 | SE 9 | SE 9 | E 12 | S 10 | ESE 8 | ESE 16 | ESE 15 | ESE 14 | ESE 12 |
32 | 83 | 145 | 135 | 142 | 235 | 272 | 237 | 155 | 138 | 110 | 96 | 77 | 75 | 3 | 2 | 270 | 1799 | 4985 | 5230 | 3680 | |
Swell 2 Height (m) Direction Period (s) | SE 4 | E 13 | E 13 | E 13 | E 12 | E 12 | S 7 | E 13 | E 13 | E 12 | S 7 | E 13 | E 12 | E 12 | S 6 | — | SE 20 | ESE 9 | — | — | — |
7 | 31 | 29 | 13 | 12 | 12 | 1 | 14 | 12 | 3 | 1 | 3 | 3 | 3 | 1 | — | 104 | 328 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | S 7 | S 7 | S 6 | S 7 | S 7 | S 7 | E 15 | S 6 | S 7 | E 14 | S 7 | S 7 | S 7 | S 7 | S 6 | — | S 10 | S 10 | — | — | — |
8 | 8 | 3 | 3 | 1 | 1 | 17 | 1 | 1 | 4 | 1 | 1 | 1 | 1 | 1 | — | 2 | 7 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | SE 3 | — | — | — | — | — | — | — | — | — | NNE 2 | NNE 3 | NE 3 | ESE 6 | ESE 8 | — | — | — | ESE 14 | ESE 12 |
— | 4 | — | — | — | — | — | — | — | — | — | 1 | 2 | 2 | 158 | 383 | — | — | — | 6825 | 3823 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 6 | 11 | 11 | 0 | 11 | 0 | 0 | 64 | 0 | 0 | 0 | 0 | 0 | 0 | 19 | 0 | 0 | 0 | 0 | 245 | 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.










