Surf Forecasts:
Asakawa surf forecast from 30 Aug 2026:
- Best quality surf: Wednesday 2 Sep, 3AM (local time) - 5ft (1.5m), 8s period, SSE swell with glassy winds.
- Most powerful swell: Monday 7 Sep, 3AM (local time) - 11ft (3.5m), 10s period, ESE swell with 2,418 kJ wave energy.
- Next surfable swell (1★+): Monday 31 Aug, 3AM (local time) - 2ft (0.6m), 7s 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 Monday (Aug 31) at 3AM. The primary swell is predicted to be 0.6m and 7s period with a secondary swell of 0.3m and 10s. Another secondary swell of 0.6m and 4s 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 10s and forecast to arrive on Monday (Sep 07) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Saturday (Sep 05) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Mon 31st Aug) | 2ft (0.6m) 7s |
| Best Surf | 3AM (Wed 2nd Sep) | 5ft (1.5m) 8s |
| Most Powerful | 3AM (Mon 7th Sep) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here, giving you the lowdown on Asakawa in feet and miles per hour. The first stretch is a slog – small, onshore, and messy through to the morning of Saturday the 5th of September. The water’s about 84°F, which is a touch warmer than typical for this time of year.
Saturday the 5th finally cleans up with light offshore breezes, but the swell is tiny, around 2ft from the SE (9-8 second period) and weak energy (154). It’s surfable but nothing special.
Then things get interesting. Monday the 8th of September afternoon goes glassy with a 6ft SSE swell (10 seconds) and solid energy (744). Tuesday the 9th is the big one: glassy, 8ft from the ESE (13 seconds), massive energy (2664) – that’s an expert day, clean and powerful. Wednesday the 10th stays clean with north offshore wind, still 8ft from the ESE (12 seconds). Asakawa is a point, so that long-period groundswell will hold its shape nicely, though it’s an inconsistent spot and you’ll have company with “sometimes” crowds.
Sunday the 13th sees a monster: 16ft from the S (10-11 seconds), extreme energy (4852-6074), glassy and deadly – strictly for the pros. After that, it drops fast to 4ft on Monday the 14th.
So, week one is a bust. The real action is Sept 8th through 13th, with Tuesday the 9th and Sunday the 13th as the absolute standouts for those ready to go big.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Tue night. Warm (max 31°C on Mon morning, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 20mm), heaviest during Wed night. Warm (max 30°C on Fri morning, min 24°C on Sat afternoon). Wind will be generally light. | ||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | ||||||||||||||
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) | SSW 7 | S 9 | S 8 | SE 10 | ESE 13 | S 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 9 | SE 8 | SSW 9 | S 8 | S 8 | ESE 8 | ESE 8 | ESE 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 101 | 73 | 51 | 31 | 59 | 72 | 232 | 201 | 176 | 270 | 142 | 162 | 193 | 933 | 409 | 117 | 62 | 122 | 603 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | cross-on | on | on | on | cross-on | on | glassy | glassy | glassy | glassy | cross | cross-on | cross-off | cross-off | cross | cross |
High Tide | 7:26AM1.80m | 7:38PM1.81m | 8:07AM1.73m | 8:03PM1.78m | 8:53AM1.61m | 8:30PM1.72m | 9:51AM1.47m | 9:02PM1.65m | 11:18AM1.35m | 9:43PM1.56m | 1:51PM1.33m | 11:00PM1.46m | |||||||
Low Tide | 1:19AM0.40m | 1:31PM0.43m | 1:53AM0.35m | 2:01PM0.58m | 2:31AM0.33m | 2:32PM0.75m | 3:16AM0.36m | 3:06PM0.93m | 4:13AM0.42m | 3:51PM1.11m | 5:37AM0.48m | 5:35PM1.26m | |||||||
 |  | |  | | | |  |  | | | |  | |  | |  |  |  | |
 | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — |
 | 6:30 | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — |
mm | 1 | — | — | — | — | — | 3 | 2 | — | 8 | 1 | 1 | 1 | — | 1 | 1 | 1 | 6 | 1 |
Temp °C | 27 | 31 | 30 | 27 | 30 | 30 | 27 | 30 | 30 | 27 | 28 | 28 | 27 | 30 | 29 | 26 | 26 | 25 | 24 |
Feels °C | 32 | 34 | 33 | 32 | 32 | 33 | 32 | 33 | 33 | 32 | 33 | 33 | 33 | 34 | 32 | 30 | 29 | 28 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | S 9 | S 8 | S 8 | S 8 | S 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 9 | SSE 7 | S 9 | S 8 | S 8 | ESE 8 | ESE 8 | ESE 9 |
| kJ | 54 | 73 | 51 | 31 | 32 | 72 | 159 | 201 | 176 | 188 | 142 | 162 | 62 | 562 | 409 | 117 | 62 | 122 | 603 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SSW 9 | ESE 13 | ESE 12 | E 12 | E 11 | E 11 | ESE 11 | E 10 | E 9 | ESE 8 | ESE 8 | ESE 8 | ESE 9 | S 7 | SSW 10 | SSW 10 |
| kJ | 38 | 25 | 25 | 31 | 59 | 52 | 70 | 61 | 58 | 37 | 51 | 41 | 35 | 113 | 90 | 65 | 37 | 43 | 57 |
Swell 3 Height (m) Direction Period (s) | SW 9 | E 10 | SSW 10 | SE 10 | SE 9 | SE 9 | SE 10 | SE 10 | SE 11 | SE 10 | SE 10 | SE 10 | SSW 11 | ESE 8 | S 16 | SW 10 | SSW 10 | SSE 7 | — |
| kJ | 3 | 2 | 10 | 24 | 23 | 22 | 14 | 14 | 18 | 17 | 16 | 16 | 46 | 113 | 5 | 27 | 40 | 15 | — |
Wind waves Height (m) Direction Period (s) | SSW 7 | SW 4 | SSW 3 | — | — | — | SSE 8 | — | — | SSE 8 | — | SE 7 | SE 8 | SSW 9 | NNE 4 | NE 4 | NNE 4 | NNE 5 | — |
| kJ | 101 | 11 | 2 | — | — | — | 232 | — | — | 270 | — | 75 | 193 | 933 | 12 | 19 | 38 | 33 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 11 | 11 | 14 | 19 | 475 | 14 | 43 | 19 | 0 | 0 | 0 | 0 | 43 | 967 | 0 | 0 | 22 | 19 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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