Surf Forecasts:
Asakawa surf forecast from 8 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 12PM (local time) - 7.5ft (2.3m), 9s period, S swell with glassy winds.
- Most powerful swell: Wednesday 9 Sep, 6AM (local time) - 11ft (3.5m), 9s period, S swell with 1,903 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 12PM (local time) - 7.5ft (2.3m), 9s period with S 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 09) at 12PM. The primary swell is predicted to be 2.3m and 9s period with a secondary swell of 0.1m and 18s. Another secondary swell of 2.1m and 8s 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 3.5m 9s and forecast to arrive on Wednesday (Sep 09) at 6AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Wednesday (Sep 09) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Wed 9th Sep) | 7.5ft (2.3m) 9s |
| Best Surf | 12PM (Wed 9th Sep) | 7.5ft (2.3m) 9s |
| Most Powerful | 6AM (Wed 9th Sep) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
G’day, Rusty here again, giving you the same local rundown but in feet and Fahrenheit for those who think that way.
Alright, the next couple of weeks are pretty flat and average, but there are a couple moments that might get you out of bed.
We kick off on Tuesday, September 8th, with a solid 8ft SSE swell hitting Asakawa. That’s a point break that likes SE swell best. The energy is strong—1936 (strong wave energy)—but the wind is a cross-on from the south at 10 km/h and there’s a risk of thunderstorms. Water temp is a warm 83°F, about average for the season. The 9-second period means the waves are a bit lumpy and wind-affected. This one is for the experienced crew only, beginners should sit this out.
Wednesday morning the 9th turns nasty: 12ft from the south with a 20 km/h SW wind—total chop and stormy conditions. Skip it.
Wednesday afternoon improves though. The wind switches to a cross-off from the NNE at 20 km/h, dropping the swell to 6ft from the SSE with 545 (moderate) energy. It’s clean, but the 8-second period means short, weak waves. Still, it’s the best of the early run for anyone wanting a clean wave.
From Thursday the 10th through Saturday the 12th, we’ve got small glassy conditions, swells under 4ft, periods of 7-8 seconds, and weak energy (70-218). Tiny waves for longboards or funboards.
Sunday and Monday the 13th-14th are mostly poor with onshore winds and small swell.
The real standout arrives Tuesday morning, September 15th. Glassy conditions, a light 5 km/h wind, and a clean 4ft ESE swell with a 9-second period. Energy is 228 (weak), but the glassy surface makes it super clean. This is your best shot for a fun, uncrowded session on an inconsistent but rewarding point.
After that, the rest of the run into late September is small and weak, with a few glassy mornings on the 20th and 21st offering 2-3ft ESE swell. Nothing special.
So, your best bet is Tuesday the 15th morning. The rest is mostly quiet and small.
Rusty out.
Short Range ForecastHeavy rain (total 58mm), heaviest during Tue night. Warm (max 28°C on Tue afternoon, min 21°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 34mm), heaviest during Mon morning. Warm (max 28°C on Sun afternoon, min 23°C on Mon morning). Wind will be generally light. | |||||||||||||||||||
Tue 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | ||||||||||||||
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 | S 10 | S 9 | SSE 8 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 8 | SSE 7 | S 7 | S 7 | E 5 | E 13 | ESE 5 | ESE 9 | ESE 8 | ESE 9 | ESE 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1143 | 1631 | 1693 | 510 | 202 | 158 | 154 | 140 | 136 | 113 | 84 | 36 | 38 | 42 | 32 | 35 | 202 | 175 | 247 | 276 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-off | cross-off | cross-off | cross-off | glassy | glassy | glassy | glassy | glassy | glassy | glassy | cross-on | on | glassy | cross-on | cross-off | cross-on |
High Tide | 4:52PM1.68m | 3:59AM1.68m | 5:21PM1.76m | 4:49AM1.79m | 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 | |||||||
Low Tide | 10:28PM0.91m | 10:41AM0.18m | 11:04PM0.73m | 11:20AM0.16m | 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 | |||||||
 |  | |  |  |  |  | | | | | | |  | | | |  |  |  | |
 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — |
 | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:10 | — |
mm | 7 | 32 | 11 | 3 | 1 | 1 | — | 1 | 2 | 1 | 2 | 4 | 4 | 3 | 2 | 3 | 6 | 9 | 14 | 26 |
Temp °C | 28 | 27 | 27 | 25 | 22 | 24 | 25 | 23 | 24 | 24 | 24 | 25 | 26 | 25 | 27 | 28 | 25 | 25 | 23 | 25 |
Feels °C | 33 | 32 | 30 | 27 | 21 | 24 | 26 | 25 | 29 | 29 | 28 | 30 | 31 | 30 | 30 | 32 | 29 | 29 | 27 | 29 |
Swell 1 Height (m) Direction Period (s) | S 9 | SSE 10 | E 18 | SSE 8 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 8 | SSE 7 | S 7 | S 7 | ESE 5 | ESE 9 | ESE 9 | ESE 9 | ESE 8 | ESE 9 | ESE 9 |
| kJ | 539 | 1338 | 6 | 510 | 202 | 158 | 154 | 140 | 136 | 113 | 84 | 36 | 34 | 15 | 32 | 35 | 202 | 175 | 247 | 276 |
Swell 2 Height (m) Direction Period (s) | SE 8 | — | — | E 18 | E 16 | E 16 | E 15 | ESE 11 | E 15 | E 7 | ESE 10 | ESE 5 | ESE 5 | S 7 | S 7 | S 7 | S 6 | S 8 | SSW 8 | SSW 8 |
| kJ | 215 | — | — | 6 | 5 | 5 | 4 | 12 | 17 | 8 | 19 | 10 | 9 | 23 | 15 | 8 | 7 | 12 | 6 | 6 |
Swell 3 Height (m) Direction Period (s) | ESE 10 | — | — | SW 7 | — | — | E 18 | E 15 | E 14 | E 14 | E 14 | SE 10 | ESE 10 | ESE 10 | E 13 | E 13 | E 13 | E 13 | E 12 | SSW 8 |
| kJ | 39 | — | — | 29 | — | — | 6 | 17 | 65 | 15 | 36 | 24 | 38 | 35 | 31 | 31 | 13 | 13 | 12 | 11 |
Wind waves Height (m) Direction Period (s) | SSE 9 | S 10 | S 9 | NNE 3 | NNE 6 | NNE 5 | NE 4 | NNE 2 | NE 3 | NE 3 | NNE 3 | NE 3 | NE 3 | E 5 | SE 4 | ESE 5 | — | — | — | NNE 3 |
| kJ | 1143 | 1631 | 1693 | 4 | 97 | 52 | 14 | 1 | 2 | 2 | 2 | 2 | 1 | 42 | 8 | 33 | — | — | — | 6 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 11 | 11 | 11 | 43 | 43 | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 43 | 43 | 0 | 19 | 0 | 43 |
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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