Surf Forecasts:
Asakawa surf forecast from 23 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 6AM (local time) - 10ft (3.0m), 15s period, SSE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 3AM (local time) - 10ft (3.0m), 15s period, SSE swell with 4,190 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 3AM (local time) - 2.5ft (0.8m), 13s 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 Monday (Aug 24) at 3AM. The primary swell is predicted to be 0.8m and 13s period with a secondary swell of 0.4m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 3.0m 15s and forecast to arrive on Tuesday (Aug 25) 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 0.3m 2s period and expected on Friday (Aug 28) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Mon 24th Aug) | 2.5ft (0.8m) 13s |
| Best Surf | 6AM (Tue 25th Aug) | 10ft (3.0m) 15s |
| Most Powerful | 3AM (Tue 25th Aug) | 10ft (3.0m) 15s |
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’s on the cards for Asakawa over the next couple of weeks.
First off, the water temp is sitting at about 84°F, which is pretty much what you’d expect for this time of year. Nothing wild there.
The opening part of the forecast is a bit of a slow burn. Sunday afternoon the 23rd has a tiny 1ft swell from the SE, but the wind is onshore and it’s just poor. Not worth paddling out for. The real action doesn’t kick off until Monday morning the 24th. That’s our first standout.
Monday morning the 24th is where you want to be. We’ve got a clean 4ft SE groundswell, with a lovely 19-second period, and the wind is off the land – glassy conditions. The combined energy is pumping at 1288 (moderate), and the report says “expect very good surf conditions.” That’s a proper session. Asakawa is a point break, so that long period groundswell will wrap in nicely. Just keep in mind it can get a bit inconsistent here, and crowds are possible, so get in early.
The swell builds through the week. Tuesday morning the 25th sees 10ft from the SSE at 14 seconds, but the wind is cross-onshore, which messes it up a bit. That’s a lot of power (3685 energy), but it’s not clean. Wednesday the 26th is similar – plenty of size but cross-on winds. The swell stays solid through the end of the month, but the wind is a problem. We get a few glassy mornings on the 28th, 29th, and 30th with smaller 2ft to 3ft swell, but it’s very ordinary, weak energy (around 100-200). Not much to write home about.
Then we hit a bit of a lull. The first few days of September are quiet, with small waves and onshore winds. The next real standout pops up on Wednesday morning the 2nd of September. Now we’re talking. The swell is 6ft from the S at 14 seconds, the wind is cross-offshore from the NE, and the energy is strong at 1675. The report says “excellent surf conditions for experienced surfers.” That 8ft+ threshold is for experts, but at 6ft this is a solid intermediate session. The direction is S, which matches the optimum swell direction for Asakawa (SE is close enough). This is the pick of the second week.
Thursday morning the 3rd of September is another good one. Similar 8ft S swell, 13-second period, cross-offshore wind, and strong energy at 2165. Again, it’s for experienced surfers, but the conditions are clean. The wind stays favorable through the 4th, but by the 5th and 6th, a strong onshore breeze from the E and SSE ruins it, with the swell getting messy and lumpy. That’s the end of the run.
So, to sum it up: your best bets are Monday morning the 24th for clean, glassy, long-period fun, and Wednesday morning the 2nd of September for a bigger, cleaner groundswell session. After that, the wind turns ugly and the swell drops off. Get it while you can.
- Rusty
Short Range ForecastMostly dry. Warm (max 31°C on Tue morning, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 24mm), heaviest during Thu night. Warm (max 30°C on Wed afternoon, min 25°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Sun 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | ||||||||||||||
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 13 | SE 12 | SE 19 | SE 16 | SSE 17 | SSE 14 | SSE 14 | S 14 | S 13 | S 12 | SSW 11 | SSW 11 | S 10 | SSE 9 | SSE 8 | SSE 8 | SSW 9 | S 8 | S 8 | S 8 |
Wave Graph | ||||||||||||||||||||
45 | 152 | 1254 | 2357 | 2215 | 3651 | 3096 | 2898 | 1912 | 911 | 486 | 256 | 349 | 237 | 116 | 89 | 111 | 109 | 82 | 84 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | glassy | on | cross | cross-on | cross-on | cross-off | cross-on | cross-on | cross | cross-on | cross | cross | glassy | cross-on | cross-off | glassy | cross-on | cross |
High Tide | 4:43PM1.42m | 2:31AM1.38m | 5:04PM1.52m | 3:35AM1.49m | 5:25PM1.60m | 4:20AM1.60m | 5:47PM1.67m | 4:59AM1.70m | 6:08PM1.73m | 5:36AM1.78m | 6:30PM1.78m | 6:12AM1.83m | 6:52PM1.81m | |||||||
Low Tide | 9:51PM1.18m | 9:51AM0.47m | 10:27PM1.07m | 10:31AM0.36m | 10:55PM0.96m | 11:05AM0.27m | 11:22PM0.84m | 11:35AM0.21m | 11:50PM0.72m | 12:05PM0.20m | 00:18AM0.60m | 12:33PM0.23m | 00:48AM0.49m | |||||||
— | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | |
6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 10 | 5 | 5 | 3 | — | 2 | 3 |
Temp °C | 30 | 27 | 30 | 30 | 26 | 31 | 30 | 26 | 31 | 30 | 28 | 30 | 28 | 27 | 29 | 29 | 26 | 30 | 30 | 27 |
Feels °C | 33 | 32 | 33 | 34 | 30 | 34 | 32 | 30 | 34 | 33 | 32 | 33 | 31 | 31 | 34 | 32 | 30 | 34 | 33 | 32 |
Swell 1 Height (m) Direction Period (s) | S 8 | SE 12 | SE 19 | SE 16 | SE 14 | SSE 14 | SSE 14 | S 14 | S 13 | S 12 | SSW 11 | SSE 8 | S 10 | SSE 9 | SSE 8 | SSE 8 | SSW 9 | S 8 | S 8 | S 8 |
30 | 152 | 1254 | 2357 | 1704 | 3651 | 3096 | 2898 | 1912 | 911 | 486 | 177 | 349 | 237 | 116 | 89 | 111 | 109 | 82 | 84 | |
Swell 2 Height (m) Direction Period (s) | SE 13 | SSW 9 | S 8 | SSW 8 | SSE 17 | E 15 | E 14 | E 13 | SE 9 | SE 9 | SE 9 | SSW 11 | E 11 | SSW 9 | SSW 9 | SSW 9 | SSE 7 | ESE 9 | ESE 9 | SE 11 |
45 | 30 | 21 | 21 | 2215 | 17 | 16 | 32 | 144 | 190 | 159 | 256 | 10 | 46 | 58 | 79 | 34 | 16 | 16 | 19 | |
Swell 3 Height (m) Direction Period (s) | ESE 11 | S 8 | SW 9 | S 8 | SW 8 | E 15 | SW 9 | — | E 13 | E 13 | E 12 | E 12 | SE 16 | E 11 | SE 10 | SE 10 | ESE 9 | SSE 9 | SSW 10 | SW 10 |
23 | 21 | 13 | 11 | 18 | 17 | 13 | — | 30 | 29 | 25 | 11 | 10 | 9 | 23 | 14 | 17 | 9 | 11 | 17 | |
Wind waves Height (m) Direction Period (s) | SSW 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | N 3 | — | — | — |
1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 11 | 2 | 0 | 11 | 2 | 11 | 11 | 0 | 11 | 11 | 2 | 11 | 2 | 2 | 0 | 11 | 0 | 0 | 11 | 2 |
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)
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.











