Surf Forecasts:
Asakawa surf forecast from 4 Sep 2026:
- Best quality surf: Sunday 6 Sep, 9AM (local time) - 10ft (3.0m), 9s period, E swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 9PM (local time) - 10ft (3.0m), 11s period, ESE swell with 2,112 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 12AM (local time) - 3ft (0.9m), 10s period with SSW 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 Saturday (Sep 05) at 12AM. The primary swell is predicted to be 0.9m and 10s period with a secondary swell of 0.6m and 6s. 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 11s and forecast to arrive on Sunday (Sep 06) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Friday (Sep 04) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sat 5th Sep) | 3ft (0.9m) 10s |
| Best Surf | 9AM (Sun 6th Sep) | 10ft (3.0m) 9s |
| Most Powerful | 9PM (Sun 6th Sep) | 10ft (3.0m) 11s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here again, breaking down the same lineup in feet and Fahrenheit for you.
The water is running a touch warmer than average for this time of year, so you won't need a thick winter suit.
Friday the 4th is a total loss. There’s a 5ft south swell, but with thunderstorms and 18 mph cross-off winds, it’s a mess.
Saturday the 5th is small—around 3ft—and the wind is still cross-off. It’s rideable, but nothing you’d set an alarm for.
Then we get to Sunday the 6th. This is the one. A 10ft east swell is pouring in. The combined energy reading is massive, and this is a powerful, expert-only day. The wind is light and cross-off in the morning, so it’ll be clean. This is a point break, so that longer period swell will wrap in nicely. Crowds are possible at this inconsistent spot. This is your session if you’ve got the guts.
Monday the 7th still has a solid 7ft from the southeast, but quality is more marginal. Tuesday the 8th cleans up with a 4ft to 4ft south swell and a nice 11-second period. It’s a good, clean option, but not the beast that Sunday was.
From Wednesday the 9th onward, the swell drops off to under 3ft. The morning of the 11th offers a tiny glassy window, but it’s short-period windswell.
The second week, from around the 13th, is mostly flat. A small, long-period southeast groundswell on the 13th (around 2ft, 14-second period) gives a glassy morning, but it’s barely a ripple. The rest of the week is all under 3ft and generally ugly.
Bottom line: your only real shot at something memorable is Sunday the 6th. Everything else is small, weak, or blown out. After the 10th, you’re looking at a long stretch of nothing worth the drive.
Get out there Sunday, or wait for the next system.
- Rusty
Short Range ForecastHeavy rain (total 207mm), heaviest during Fri afternoon. Warm (max 26°C on Fri morning, min 21°C on Fri afternoon). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 29mm), heaviest during Mon morning. Warm (max 29°C on Wed morning, min 23°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | |||||||||||||||
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) | S 10 | S 10 | SSW 10 | SSW 9 | SSW 9 | ESE 7 | E 9 | ESE 10 | SE 11 | SE 10 | SE 10 | SE 10 | S 11 | S 11 | S 10 | S 9 | SE 8 | SE 8 | SE 7 | SE 8 | ESE 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 408 | 362 | 166 | 141 | 119 | 256 | 1669 | 1163 | 1081 | 876 | 520 | 293 | 284 | 379 | 217 | 108 | 115 | 109 | 44 | 82 | 127 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 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 | 3:59AM1.68m | 5:21PM1.76m | 4:49AM1.79m | 5:47PM1.81m | ||||||||
Low Tide | 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 | 10:41AM0.18m | 11:04PM0.73m | 11:20AM0.16m | 11:38PM0.57m | ||||||||
 |  |  |  |  |  | | | | | |  |  |  |  | | |  | | | | |
 | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — |
 | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — |
mm | 16 | 52 | 41 | 6 | 2 | 7 | 7 | 36 | 40 | 21 | 7 | 1 | — | — | — | — | — | — | 1 | 4 | 15 |
Temp °C | 26 | 21 | 22 | 23 | 23 | 24 | 25 | 24 | 24 | 24 | 24 | 24 | 28 | 27 | 25 | 29 | 29 | 25 | 23 | 23 | 24 |
Feels °C | 30 | 19 | 24 | 24 | 24 | 26 | 27 | 25 | 23 | 26 | 26 | 26 | 30 | 30 | 28 | 30 | 30 | 25 | 22 | 24 | 28 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 10 | SSW 10 | SSW 9 | ESE 7 | ESE 7 | ESE 9 | ESE 10 | E 10 | SE 10 | SE 10 | SE 10 | S 11 | S 11 | SE 9 | SE 8 | SE 8 | SE 8 | SE 7 | SE 8 | S 7 |
| kJ | 408 | 362 | 166 | 141 | 70 | 256 | 729 | 1163 | 1081 | 876 | 520 | 293 | 284 | 379 | 217 | 100 | 115 | 109 | 44 | 82 | 27 |
Swell 2 Height (m) Direction Period (s) | SE 9 | ESE 9 | ESE 6 | ESE 7 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SE 11 | E 9 | S 11 | S 11 | SE 9 | SE 9 | S 10 | S 9 | S 9 | S 8 | SSE 8 | ESE 10 | SE 9 |
| kJ | 31 | 17 | 31 | 54 | 119 | 67 | 31 | 8 | 1027 | 173 | 121 | 182 | 176 | 172 | 183 | 108 | 76 | 36 | 21 | 9 | 13 |
Swell 3 Height (m) Direction Period (s) | E 9 | SE 9 | SSE 8 | SE 9 | E 9 | — | — | SSE 10 | — | SSW 10 | SW 10 | SW 11 | — | SE 12 | NE 5 | SSE 9 | E 18 | E 16 | SSW 8 | NNE 3 | ESE 11 |
| kJ | 16 | 13 | 33 | 13 | 2 | — | — | 10 | — | 10 | 4 | 5 | — | 73 | 12 | 46 | 6 | 5 | 22 | 1 | 12 |
Wind waves Height (m) Direction Period (s) | NE 3 | NNE 5 | NE 4 | NNE 4 | NNE 4 | NNE 4 | E 9 | NNE 4 | NNE 5 | NNE 5 | NNE 5 | NNE 5 | NNE 6 | NE 5 | NNE 5 | NE 4 | NE 4 | NE 4 | NNE 4 | E 5 | ESE 6 |
| kJ | 8 | 130 | 14 | 16 | 7 | 5 | 1669 | 19 | 50 | 74 | 36 | 38 | 47 | 35 | 35 | 5 | 9 | 18 | 9 | 41 | 127 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 43 | 0 | 0 | 1 | 0 | 0 | 43 | 57 | 14 | 14 | 0 | 0 | 0 | 0 | 0 | 43 | 43 | 43 | 43 | 0 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Asakawa surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest