Surf Forecasts:
Asakawa surf forecast from 26 Aug 2026:
- Best quality surf: Friday 28 Aug, 9PM (local time) - 2.5ft (0.8m), 7s period, S swell with glassy winds.
- Most powerful swell: Wednesday 2 Sep, 12PM (local time) - 11ft (3.5m), 15s period, SSE swell with 5,839 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 9PM (local time) - 2.5ft (0.8m), 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 Friday (Aug 28) at 9PM. The primary swell is predicted to be 0.8m and 7s period with a secondary swell of 0.4m and 9s. 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 15s and forecast to arrive on Wednesday (Sep 02) at 12PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 28th Aug) | 2.5ft (0.8m) 7s |
| Best Surf | 9PM (Fri 28th Aug) | 2.5ft (0.8m) 7s |
| Most Powerful | 12PM (Wed 2nd Sep) | 11ft (3.5m) 15s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s take a look at what Asakawa has in store.
Right now, Asakawa is a bit of a waiting game. The water temp is sitting at a toasty 84°F, which is a touch warmer than normal for this time of year. That’s nice, but the surf just isn’t there to start with. We’ve got a long dry spell before anything decent shows up. From now through the end of August, and well into the first week of September, conditions are pretty grim. You’ll see small, weak swells with poor winds and a lot of chop. There’s a couple of glassy mornings – Saturday the 29th and Sunday the 30th – where you could squeak out a surfable wave on the small stuff (3ft to 3ft), but honestly, the energy is weak (71 to 135 combined) and the swell period is short, so it’s pretty ordinary. Nothing worth getting excited about.
Then there’s a big gap of surfable but ugly conditions. The winds are onshore, swells get messy, and even when a bigger groundswell tries to push in around the 1st and 2nd of September, it’s accompanied by strong winds and risk of t-storms. The energy ramps up huge (4186 to 4763 combined) with 10ft swell and a long 15-16 second period on the 2nd, but with onshore winds and that exposed point, it’s a washing machine. Not for paddling – looks more interesting for kite surfing if you’re into that.
The real standout, the one to circle on your calendar, is the 8th of September (Tuesday) into the 9th. On the 8th morning, we’ve got a solid 13ft S swell (period 12 seconds) pouring in with a light offshore from the NNW. The energy is massive (7079 combined). This is exceptional – but listen, it’s big and powerful. This is for experts only, no question. By the afternoon of the 8th, the wind goes glassy and the swell drops a touch to 12ft, still excellent, still only for the crew who know what they’re doing.
The 9th of September morning is also a beauty: 10ft SSE swell, glassy conditions, clean. Still big, still for experienced surfers only. The point at Asakawa will really show its magic during this stretch – that long period groundswell will wrap in nicely, but it can make the waves a bit straight at certain spots, so pick your peak.
So, to sum it up: don’t bother paddling out until the second week of September. The first week is a write-off. The 8th and 9th of September are your prime days – big, clean, and for the brave. After that, it tapers off into smaller, more manageable stuff with lighter winds, but nothing that will blow you away.
Rusty
Short Range ForecastLight rain (total 6mm), mostly falling on Fri afternoon. Warm (max 31°C on Wed morning, min 26°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 46mm), heaviest during Mon night. Warm (max 30°C on Sun morning, min 26°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | |||||||||||||||
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 11 | S 11 | SSW 11 | SSE 9 | SSE 10 | S 9 | SSW 8 | SSW 8 | S 7 | SSW 7 | SSW 7 | SSW 7 | SSW 6 | S 7 | S 12 | S 10 | S 10 | S 12 | S 13 | S 15 | S 16 |
Wave Graph | |||||||||||||||||||||
1006 | 640 | 308 | 180 | 179 | 198 | 116 | 94 | 69 | 97 | 94 | 108 | 45 | 52 | 46 | 98 | 67 | 102 | 276 | 835 | 2576 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross-off | glassy | cross-on | cross-off | glassy | cross-on | cross | on | cross-on | cross-on | cross-on | on | on |
High Tide | 5:47PM1.67m | 4:59AM1.70m | 6:08PM1.73m | 5:36AM1.78m | 6:30PM1.78m | 6:12AM1.83m | 6:52PM1.81m | 6:48AM1.84m | 7:14PM1.82m | 7:26AM1.80m | 7:38PM1.81m | 8:07AM1.73m | 8:03PM1.78m | ||||||||
Low Tide | 11:05AM0.27m | 11:22PM0.84m | 11:35AM0.21m | 11:50PM0.72m | 12:05PM0.20m | 00:18AM0.60m | 12:33PM0.23m | 00:48AM0.49m | 1:02PM0.31m | 1:19AM0.40m | 1:31PM0.43m | 1:53AM0.35m | 2:01PM0.58m | 2:31AM0.33m | |||||||
5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | |
— | 6:37 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | |
mm | — | — | — | — | — | — | 1 | 4 | 1 | 2 | 9 | 5 | 1 | 4 | 4 | — | 1 | 20 | 18 | 11 | 21 |
Temp °C | 31 | 31 | 27 | 31 | 31 | 27 | 30 | 29 | 26 | 29 | 29 | 27 | 30 | 29 | 27 | 29 | 29 | 27 | 27 | 27 | 27 |
Feels °C | 33 | 33 | 31 | 33 | 33 | 31 | 34 | 34 | 31 | 34 | 34 | 32 | 35 | 34 | 32 | 31 | 32 | 30 | 30 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | S 11 | S 11 | SSW 11 | SSE 9 | SSE 10 | SW 9 | SSE 8 | SSE 8 | S 7 | SE 10 | ESE 9 | S 7 | SSW 6 | S 7 | S 8 | S 10 | S 10 | SSE 10 | SE 9 | SE 9 | S 16 |
1006 | 640 | 308 | 180 | 179 | 39 | 58 | 52 | 69 | 14 | 8 | 51 | 45 | 52 | 46 | 98 | 67 | 86 | 170 | 466 | 2576 | |
Swell 2 Height (m) Direction Period (s) | E 13 | SE 9 | SSE 9 | SSW 10 | E 11 | SSW 8 | SE 10 | SSE 10 | SSE 9 | E 10 | SSE 9 | SE 11 | SE 10 | SE 10 | S 12 | S 12 | SE 10 | S 12 | S 13 | S 15 | SE 9 |
30 | 186 | 181 | 154 | 10 | 14 | 15 | 10 | 8 | 7 | 8 | 19 | 17 | 26 | 44 | 27 | 37 | 102 | 276 | 835 | 393 | |
Swell 3 Height (m) Direction Period (s) | SE 15 | E 13 | E 12 | SSE 11 | SE 16 | E 11 | ESE 11 | E 11 | E 11 | SSE 13 | SE 13 | ESE 8 | ESE 10 | S 13 | SE 10 | SE 10 | S 12 | SSW 8 | E 12 | E 12 | — |
8 | 29 | 25 | 25 | 10 | 9 | 23 | 9 | 9 | 17 | 7 | 7 | 9 | 3 | 28 | 16 | 45 | 7 | 11 | 11 | — | |
Wind waves Height (m) Direction Period (s) | — | — | SW 3 | — | SSW 9 | S 9 | SSW 8 | SSW 8 | — | SSW 7 | SSW 7 | SSW 7 | — | — | — | — | SSE 7 | — | E 4 | E 5 | — |
— | — | 6 | — | 161 | 198 | 116 | 94 | — | 97 | 94 | 108 | — | — | — | — | 18 | — | 15 | 69 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 11 | 11 | 2 | 2 | 11 | 2 | 2 | 2 | 0 | 0 | 19 | 0 | 0 | 11 | 2 | 19 | 43 | 369 | 473 | 475 | 402 |
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.











