Surf Forecasts:
Asakawa surf forecast from 5 Sep 2026:
- Best quality surf: Sunday 6 Sep, 9PM (local time) - 13ft (4.0m), 10s period, E swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 9PM (local time) - 13ft (4.0m), 10s period, E swell with 2,959 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 9PM (local time) - 13ft (4.0m), 10s period with E 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 Sunday (Sep 06) at 9PM. The primary swell is predicted to be 4.0m and 10s period with a secondary swell of 3.0m and 9s. Another secondary swell of 0.2m and 9s is also forecast. 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 4.0m 10s 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 1.3m 5s period and expected on Wednesday (Sep 09) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sun 6th Sep) | 13ft (4.0m) 10s |
| Best Surf | 9PM (Sun 6th Sep) | 13ft (4.0m) 10s |
| Most Powerful | 9PM (Sun 6th Sep) | 13ft (4.0m) 10s |
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 mixed bag, and we’ve got to be picky.
The opening days are a tough watch. We’ve got some size on Sunday the 6th, around 7ft from the ESE, but that heavy rain and a solid cross-off breeze makes it a real battle. The combined energy is chunky at 762, but the conditions just aren't there, making it more of a grunt session than a pleasure cruise. Monday keeps that cross-off wind, and the swell drops off a bit.
Things start to look a little more promising by mid-week. Wednesday the 9th is where you want to be. The morning has a clean 7ft from the SSE with only a light breeze, and the afternoon gets even better. The swell bumps up to 8ft from the SSE, combined energy hits 959, and with the wind dropping to a slight air, it’s going to be clean and punchy. That’s the standout window for the first week if you’re an experienced surfer – that size is pushing into expert territory. The water is sitting at 85°, a touch warmer than normal for this time of year.
After that, the surf gets a bit lazy through the 10th and 11th, with smaller swell and dodgy wind directions, so you can take a breather.
Look further ahead to the second week, and there’s a couple of calls worth watching. Sunday the 20th is a promising long-range call. We’re looking at a clean 6ft from the SSE with a solid cross-off breeze, giving us good shape and some push. That’s a solid intermediate day, with combined energy at 745. The weekend before that, the 19th, also has a chance with glassy conditions on the morning, but the swell is smaller.
Honestly, if you can only paddle out once, make it Wednesday the 9th. That afternoon window has the most grunt and the cleanest conditions.
Rusty.
Short Range ForecastHeavy rain (total 92mm), heaviest during Sun afternoon. Warm (max 28°C on Mon afternoon, min 23°C on Sun morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 30mm), heaviest during Wed morning. Warm (max 28°C on Thu morning, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | |||||||||||||||
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 | ESE 9 | E 9 | SE 9 | SE 9 | SE 9 | S 10 | S 10 | S 9 | SSE 9 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SSE 8 | SSE 8 | SSE 10 | S 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 753 | 739 | 723 | 577 | 412 | 262 | 191 | 299 | 422 | 645 | 947 | 508 | 212 | 171 | 120 | 86 | 62 | 94 | 68 | 123 | 289 |
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 | glassy | cross-on | cross-on | glassy | cross | cross-off | cross-off | cross-off | cross-on | glassy |
High Tide | 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 | 5:34AM1.87m | 6:13PM1.84m | 6:15AM1.89m | 6:37PM1.84m | ||||||||
Low Tide | 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 | 11:55AM0.21m | 00:11AM0.43m | 12:27PM0.30m | 00:43AM0.33m | ||||||||
 | |  |  | |  |  | |  |  |  |  | | | | | |  | | | | |
 | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — |
 | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — |
mm | 32 | 34 | 19 | — | — | — | — | — | 7 | 6 | 6 | 8 | 3 | 4 | 1 | 1 | 1 | — | — | — | — |
Temp °C | 23 | 23 | 24 | 27 | 28 | 26 | 27 | 27 | 26 | 27 | 26 | 25 | 28 | 27 | 24 | 26 | 26 | 25 | 28 | 28 | 25 |
Feels °C | 25 | 24 | 25 | 29 | 30 | 28 | 29 | 31 | 31 | 32 | 31 | 28 | 33 | 32 | 28 | 31 | 30 | 29 | 31 | 32 | 29 |
Swell 1 Height (m) Direction Period (s) | ESE 9 | ESE 9 | E 9 | SE 9 | SE 9 | SE 9 | SE 8 | S 10 | S 9 | SSE 9 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SSE 8 | SSE 8 | SSE 10 | S 11 |
| kJ | 753 | 739 | 723 | 577 | 412 | 262 | 191 | 299 | 422 | 645 | 947 | 508 | 212 | 171 | 120 | 86 | 62 | 94 | 68 | 123 | 289 |
Swell 2 Height (m) Direction Period (s) | SSW 9 | SSE 10 | SSE 10 | SW 8 | S 11 | S 10 | S 10 | SE 8 | SE 8 | E 18 | E 18 | E 16 | E 16 | E 15 | E 15 | E 15 | ESE 10 | ESE 10 | S 10 | S 13 | SE 10 |
| kJ | 8 | 75 | 475 | 18 | 35 | 125 | 179 | 182 | 151 | 6 | 6 | 5 | 5 | 4 | 17 | 17 | 10 | 19 | 19 | 78 | 23 |
Swell 3 Height (m) Direction Period (s) | S 8 | SSW 9 | SSW 9 | SW 10 | SW 10 | SSW 11 | SE 10 | SE 10 | ESE 10 | E 18 | E 18 | — | — | E 18 | SE 10 | ESE 11 | E 14 | E 14 | ESE 10 | SE 10 | E 14 |
| kJ | 1 | 8 | 15 | 4 | 4 | 69 | 27 | 26 | 40 | 6 | 6 | — | — | 6 | 4 | 12 | 15 | 36 | 19 | 24 | 35 |
Wind waves Height (m) Direction Period (s) | NE 4 | NNE 4 | NNE 5 | NNE 4 | NE 4 | NE 4 | NE 4 | NE 4 | NNE 3 | NNE 4 | NNE 5 | NNE 6 | NNE 5 | NE 4 | NNE 4 | NE 4 | NE 4 | NE 4 | — | N 3 | E 4 |
| kJ | 17 | 38 | 50 | 19 | 23 | 17 | 17 | 7 | 4 | 37 | 19 | 49 | 18 | 16 | 12 | 17 | 10 | 4 | — | 1 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 22 | 22 | 43 | 14 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 0 | 1 | 0 | 0 | 0 | 41 | 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.
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