Surf Forecasts:
Asakawa surf forecast from 14 Aug 2026:
- Best quality surf: Friday 21 Aug, 6AM (local time) - 7.5ft (2.3m), 8s period, S swell with glassy winds.
- Most powerful swell: Friday 21 Aug, 12PM (local time) - 8ft (2.4m), 8s period, S swell with 829 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 3AM (local time) - 2.5ft (0.7m), 10s 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 Saturday (Aug 15) at 3AM. The primary swell is predicted to be 0.7m and 10s period with a secondary swell of 0.4m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 2.4m 8s and forecast to arrive on Friday (Aug 21) 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+) | 3AM (Sat 15th Aug) | 2.5ft (0.7m) 10s |
| Best Surf | 6AM (Fri 21st Aug) | 7.5ft (2.3m) 8s |
| Most Powerful | 12PM (Fri 21st Aug) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let’s talk about the stretch ahead for our little slice of the lineup. It’s a bit of a waiting game, to be honest. We’ve got a slow, grovelly start before things finally wake up in a serious way.
For the first few days, through the weekend and into early next week, it’s a bit of a write-off. We’re looking at small, weak surf with a lot of cross-onshore chop and even a few stormy afternoons threatening to mess things up. The combo energy is weak, mostly in the low hundreds (like 109 on Friday the 14th), which just isn't enough to push any real shape through. It’s ankle-biters and paddle practice.
Then, things start to change shape around Tuesday the 18th. The wind goes glassy in the morning with a light S breeze, and a new, cleaner swell arrives from the E at 3.3ft, with an 8-second period. It’s small, but the conditions will make it feel better than it is. Energy climbs to a moderate 271. Tuesday morning looks like the first real chance to get a few fun ones, though it's not going to be a day to write home about. The water temp is 83.3°, which is about normal for this time of year, so a rashie is more than enough.
We do have a few quiet days after that, with surf dropping back down to knee-high and the winds not playing nice. The energy dips back into the weak zone, with numbers in the 50s to 100s. It's a real lull.
Hold on, because things get real around Monday the 24th. A much more significant swell starts to build. The 24th morning is glassy as a lake, and a proper groundswell from the SE rolls in with a 16-second period. The energy jumps to a strong 387. The size is only 2ft for the morning, but the combo will be there. This is the beginning of the main event.
The real standout is Tuesday the 25th and Wednesday the 26th. This is what we’ve been waiting for. A solid swell, straight out of the ESE, pushes wave heights up to 5ft to 6ft with a long 13-14 second period. The energy readings are huge – 841, then 879, and then over a thousand at 1162 on Wednesday morning. That’s strong to very strong energy, folks. The winds are light and offshore (NNE) or totally glassy, so this point break at Asakawa is going to be firing with clean, lined-up walls. The long period means more push and better shape, and this setup should handle it perfectly. This is the best window we’ve got on offer.
There’s a bit of swell left on Wednesday afternoon, but a cross-onshore breeze kicks up, making things a little lumpy. After that, the swell fades back down and we’re back to small surf for the tail end of the week. There is a pulse of energy late on Friday the 28th, but the direction swings to the SW and it looks jumbled and messy, not worth getting excited about.
So, my call: if you only get one or two sessions in the next couple of weeks, make it the morning of the 25th or the 26th. That’s the gold. See you in the water.
Short Range ForecastHeavy rain (total 44mm), heaviest during Sun morning. Warm (max 29°C on Sat morning, min 24°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 13mm), heaviest on Thu morning. Warm (max 31°C on Tue afternoon, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||
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 8 | S 10 | S 9 | S 9 | ESE 6 | ESE 6 | ESE 6 | SE 6 | ESE 5 | ESE 9 | SE 11 | ESE 6 | ESE 7 | ESE 8 | ESE 7 | ESE 6 | ESE 5 | SE 6 | SSE 8 |
Wave Graph | |||||||||||||||||||
52 | 92 | 79 | 56 | 136 | 213 | 112 | 69 | 49 | 94 | 30 | 28 | 171 | 89 | 214 | 66 | 61 | 92 | 348 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | glassy | glassy | cross-on | off | cross | on | glassy | cross-on | on | glassy |
High Tide | 7:07AM1.87m | 7:49PM1.81m | 7:49AM1.78m | 8:14PM1.77m | 8:31AM1.66m | 8:38PM1.72m | 9:14AM1.51m | 9:01PM1.65m | 10:05AM1.37m | 9:25PM1.57m | 11:17AM1.25m | 9:52PM1.48m | |||||||
Low Tide | 1:12AM0.56m | 1:30PM0.22m | 1:48AM0.49m | 2:00PM0.39m | 2:24AM0.47m | 2:29PM0.58m | 3:02AM0.48m | 2:55PM0.76m | 3:42AM0.53m | 3:19PM0.92m | 4:31AM0.59m | 3:42PM1.07m | |||||||
— | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — | |
6:51 | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | |
mm | — | — | — | 10 | 9 | 6 | 8 | 7 | 4 | 4 | — | — | — | — | 1 | 1 | 5 | 2 | 1 |
Temp °C | 25 | 29 | 29 | 25 | 26 | 26 | 25 | 27 | 27 | 26 | 30 | 31 | 27 | 30 | 30 | 27 | 28 | 29 | 27 |
Feels °C | 29 | 32 | 32 | 29 | 29 | 29 | 29 | 31 | 31 | 31 | 33 | 33 | 30 | 34 | 34 | 33 | 33 | 34 | 33 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 10 | S 9 | S 9 | S 8 | S 9 | S 8 | SSW 8 | ESE 5 | ESE 9 | ESE 9 | ESE 6 | ESE 6 | ESE 8 | ESE 7 | SE 10 | SE 10 | SE 6 | E 16 |
52 | 92 | 79 | 56 | 51 | 39 | 35 | 22 | 49 | 94 | 26 | 27 | 96 | 89 | 101 | 35 | 25 | 92 | 5 | |
Swell 2 Height (m) Direction Period (s) | S 11 | E 10 | ESE 10 | ESE 9 | SE 12 | ESE 10 | ESE 10 | SE 11 | SSW 8 | SSW 8 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 10 | SSW 8 | S 9 | S 8 | E 16 |
37 | 30 | 31 | 25 | 48 | 33 | 32 | 42 | 21 | 20 | 20 | 28 | 28 | 16 | 16 | 7 | 15 | 22 | 5 | |
Swell 3 Height (m) Direction Period (s) | E 9 | SE 11 | SE 10 | SE 12 | SE 18 | SE 11 | SE 11 | ESE 9 | SE 11 | SE 11 | SE 11 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | S 9 | SSE 8 | SE 10 | — |
27 | 18 | 16 | 22 | 12 | 33 | 43 | 17 | 30 | 30 | 30 | 12 | 12 | 12 | 6 | 7 | 6 | 25 | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | ESE 5 | ESE 6 | ESE 6 | ESE 6 | SE 6 | — | SE 4 | ESE 5 | — | ESE 7 | — | ESE 7 | ESE 6 | ESE 5 | — | SSE 8 |
— | — | — | 24 | 136 | 213 | 112 | 69 | — | 19 | 19 | — | 171 | — | 214 | 66 | 61 | — | 348 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 19 | 43 | 43 | 459 | 14 | 43 | 43 | 0 | 0 | 22 | 0 | 22 | 19 | 0 | 43 | 385 | 0 |
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.











