
Surf Forecasts:
Asakawa surf forecast from 15 Sep 2026:
- Best quality surf: Friday 18 Sep, 6PM (local time) - 7ft (2.1m), 10s period, E swell with glassy winds.
- Most powerful swell: Sunday 20 Sep, 12AM (local time) - 10ft (3.0m), 13s period, ESE swell with 3,365 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 9AM (local time) - 3ft (0.9m), 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 Wednesday (Sep 16) at 9AM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.1m and 12s. 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 3.0m 13s and forecast to arrive on Sunday (Sep 20) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Monday (Sep 21) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Wed 16th Sep) | 3ft (0.9m) 9s |
| Best Surf | 6PM (Fri 18th Sep) | 7ft (2.1m) 10s |
| Most Powerful | 12AM (Sun 20th Sep) | 10ft (3.0m) 13s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
G’day, I’m Rusty.
Let’s break down what’s heading to Asakawa. The forecast kicks off with a quiet stretch, but once the swell shows up around Friday the 18th, the energy starts building real nice for experienced surfers. Water’s running about 81.7°F, pretty average for this time of year.
The first real standout is Friday morning the 18th – clean waves around 1.6 feet from the southeast, glassy conditions, dead calm wind. Combined energy sits at moderate 353 – a fun little session for a point wave.
But the big one is Saturday morning the 19th. Swell jumps to 7.2 feet from the east-southeast, with a very long 13-second period. That’s proper groundswell, and with a light cross-off breeze from the north-northeast, the point should handle it beautifully. Combined energy is 1615 – strong wave energy. This one’s for the experienced crew only – it’s got some heft. The long period can make the point a bit straight, so the reef and river sections will be your best bet.
Crowds are sometimes an issue at Asakawa, so expect company for that Saturday morning. Winds stay clean until about lunch, then go onshore.
Sunday the 20th stays big – 9.8 feet in the morning, same direction, period drops to 12 seconds. Energy is still massive at 2403, but it’s clean with moderate cross-off winds. Only for experts. Monday the 21st has a solid 5.2 feet with a clean offshore wind from the north-northwest, energy at 683 – a punchy session without the extreme size.
After Monday, things fall off quick. From Tuesday the 22nd through Thursday the 24th, waves drop below 1.6 feet and energy is weak – all under 40. That’s a dead run of a few days.
Then around Sunday the 27th, a new longer-period south groundswell appears, but winds are cross-shore or onshore – poor quality. Monday the 28th sees a better 6.2 feet south swell with cross-off winds, energy back to 1175 – worth a look.
Tuesday the 29th morning is another standout – 7.2 feet from the south-southwest, a very long 15-second period, clean light winds. Combined energy is 2054 – strong. Excellent for experienced surfers, but that long period will favour the reef and river mouth.
Wednesday the 30th morning has a clean 5.9 feet from the south-southwest with glassy conditions, energy at 1421 – another top pick.
And on Thursday the 1st of October, we get the biggest pulse – a solid 14.8 feet from the south, period 11 seconds, energy a massive 5282. That’s very strong. Winds are light and cross-off, so it’s clean but huge. Only for the brave.
Best on offer: Saturday the 19th morning for clean, strong groundswell on the point, and Tuesday the 29th for another long-period clean offering. Thursday the 1st of October is the monster session but not for the faint-hearted.
Short Range ForecastModerate rain (total 14mm), heaviest on Wed morning. Warm (max 27°C on Thu morning, min 19°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Sun afternoon, min 19°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | |||||||||||||||
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) | SE 9 | ESE 9 | SE 9 | SE 9 | ESE 8 | ESE 8 | ESE 9 | ESE 10 | ESE 10 | ESE 13 | ESE 13 | ESE 13 | ESE 12 | ESE 12 | ESE 12 | ESE 12 | ESE 11 | ESE 10 | ESE 9 | ESE 9 | ESE 8 |
Wave Graph | |||||||||||||||||||||
112 | 96 | 112 | 79 | 80 | 202 | 351 | 478 | 346 | 1609 | 2477 | 3365 | 2403 | 2151 | 1839 | 671 | 158 | 38 | 28 | 26 | 13 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-off | cross-off | cross-off | glassy | cross-on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | cross-off | cross-off | off |
High Tide | 8:04PM1.66m | 9:32AM1.40m | 8:24PM1.57m | 10:38AM1.28m | 8:45PM1.47m | 1:48PM1.23m | 9:10PM1.37m | 3:50PM1.33m | 11:43PM1.27m | 4:02PM1.43m | 2:13AM1.33m | 4:20PM1.53m | |||||||||
Low Tide | 2:13PM0.87m | 2:54AM0.42m | 2:34PM1.00m | 3:36AM0.53m | 2:53PM1.12m | 4:39AM0.64m | 2:46PM1.23m | 6:31AM0.69m | 8:58PM1.25m | 8:18AM0.63m | 9:37PM1.13m | 9:16AM0.53m | 10:01PM0.99m | ||||||||
5:45 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | 5:48 | — | — | 5:48 | — | — | 5:48 | — | — | |
— | 6:07 | — | — | 6:07 | — | — | 6:06 | — | — | 6:04 | — | — | 6:02 | — | — | 6:01 | — | — | 6:00 | — | |
mm | 5 | 6 | 2 | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 24 | 22 | 27 | 27 | 23 | 26 | 26 | 24 | 28 | 28 | 24 | 28 | 29 | 23 | 28 | 28 | 22 | 27 | 27 | 21 |
Feels °C | 26 | 27 | 23 | 26 | 26 | 25 | 27 | 29 | 27 | 28 | 27 | 24 | 26 | 28 | 23 | 27 | 27 | 21 | 26 | 27 | 20 |
Swell 1 Height (m) Direction Period (s) | SE 9 | ESE 9 | SE 9 | SE 9 | ESE 8 | ESE 8 | ESE 9 | ESE 10 | ESE 10 | ESE 13 | ESE 13 | ESE 13 | ESE 12 | ESE 12 | ESE 12 | ESE 12 | ESE 11 | ESE 10 | ESE 9 | ESE 9 | ESE 8 |
112 | 96 | 112 | 79 | 80 | 202 | 351 | 478 | 346 | 1609 | 2477 | 3365 | 2403 | 2151 | 1839 | 671 | 158 | 38 | 28 | 26 | 13 | |
Swell 2 Height (m) Direction Period (s) | E 12 | S 7 | E 13 | E 12 | E 12 | E 12 | S 11 | S 10 | SE 16 | S 9 | S 9 | — | — | — | S 9 | S 9 | S 8 | E 10 | S 8 | S 8 | S 8 |
3 | 1 | 3 | 3 | 3 | 3 | 2 | 2 | 63 | 6 | 6 | — | — | — | 6 | 6 | 1 | 8 | 6 | 5 | 5 | |
Swell 3 Height (m) Direction Period (s) | E 14 | S 7 | S 7 | S 7 | — | E 12 | — | — | SE 11 | — | — | — | — | — | — | S 9 | S 10 | S 9 | S 10 | SE 10 | SSE 9 |
4 | 1 | 1 | 1 | — | 3 | — | — | 5 | — | — | — | — | — | — | 6 | 2 | 6 | 2 | 4 | 8 | |
Wind waves Height (m) Direction Period (s) | NNE 4 | NE 4 | NNE 4 | NE 4 | NE 4 | — | N 3 | — | — | N 4 | NE 4 | N 4 | NNE 4 | NNE 5 | N 6 | NNE 6 | NNE 6 | NNE 6 | NNE 6 | NNE 5 | NNE 5 |
8 | 3 | 13 | 26 | 14 | — | 1 | — | — | 27 | 18 | 50 | 32 | 44 | 23 | 8 | 21 | 59 | 20 | 15 | 15 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 43 | 43 | 0 | 0 | 22 | 0 | 0 | 43 | 0 | 43 | 43 | 0 | 0 | 0 | 6 | 2 | 14 | 14 |
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.










