Surf Forecasts:
Asakawa surf forecast from 28 Aug 2026:
- Best quality surf: Thursday 3 Sep, 6AM (local time) - 7ft (2.1m), 12s period, S swell with glassy winds.
- Most powerful swell: Friday 4 Sep, 12AM (local time) - 13ft (4.0m), 10s period, S swell with 3,412 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 9PM (local time) - 3ft (0.9m), 7s period with SSW 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 29) at 9PM. The primary swell is predicted to be 0.9m and 7s period with a secondary swell of 0.3m and 11s. 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 Friday (Sep 04) at 12AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Friday (Sep 04) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 29th Aug) | 3ft (0.9m) 7s |
| Best Surf | 6AM (Thu 3rd Sep) | 7ft (2.1m) 12s |
| Most Powerful | 12AM (Fri 4th 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 yarn about Asakawa. It’s a point break, intermediate level, and it loves a swell from the SE. Right now, we’re staring down a bit of a slow start, so be patient.
The water temperature is sitting at 85°, which is a touch warmer than normal for this time of year, so you can leave the steamer at home.
We kick off on Saturday the 29th of August. It’s pretty ordinary. A small 3ft SSW swell with a short 7 second period and weak energy (111) is getting messed up by a cross-shore breeze. Afternoon goes downhill with a storm risk. Not worth paddling out.
Sunday the 30th is where we get our first little glimmer. The morning turns glassy with a 3ft SSW swell. The period stretches to 8 seconds and the energy bumps up to moderate (197). It’s nothing to write home about, but those conditions will be clean. If you’re desperate for a slide, that’s your window.
Monday the 31st and Tuesday the 1st are pretty flat and messy. Small S swells in the 2ft to 3ft range with cross-on winds. Wait it out.
Now, pay attention to Wednesday the 2nd of September. The swell picks up to 5ft from the SSE, period at 9 seconds, and the energy jumps to 393 (moderate). Winds stay light from the SE. It’s still a bit marginal with some storm risk, but it’s starting to look more interesting.
But the real story, the standout, lands on Thursday the 3rd of September. That morning, we get a solid 8ft SSE swell with an 11-second period. The energy is strong (2611). The wind is light from the ESE. This is big, punchy, and has some proper groundswell in it. At this size, it’s only for the experienced crew. That long period will make the waves peel nicely down the point, but you might have longer waits between sets. The afternoon holds similar size and conditions.
Friday the 4th is a write-off. The swell drops a bit but the wind swings SSW and gets up to 12 mph, making a mess of it. Choppy and cross-on.
Then we get a nice little reset on Saturday the 5th of September. The swell drops to 3ft from the SSW, period at 10-11 seconds, energy in the 300s. But the wind goes cross-off from the NNE, cleaning it right up. It’ll be small but clean and fun for a cruisy session.
Sunday the 6th is where it goes wild. Big 10ft to 12ft ESE swell, but it’s wind-affected and stormy. That’s a pass for us.
Monday the 7th of September is another standout, but it’s for the brave only. We’re looking at 15ft to 18ft SE swell with a 12-second period. The energy is massive (7153 to 15812). The wind is light from the S in the morning, nearly glassy. This is huge, powerful, and dangerous. Only for top-tier experts. Afternoon gets a bit of cross-on wind.
The days that follow stay big (10ft to 13ft) but the wind is messy. Not the quality of Monday.
Finally, the last real highlight is on Saturday the 12th and especially Sunday the 13th of September. That Sunday morning, a 15ft SE swell with a very long 13-second period rolls in. The energy is massive (6012). The wind is glassy from the ENE. This is an absolute bomb for experts. Beautiful, clean, heavy waves. The period is so long it will be very orderly, but it may be too quick and straight for the beachies – perfect for a point like Asakawa. Afternoon stays clean with a light cross-on.
If this consistency holds, we’ll get a bit of a blank run early on, but the later part of the forecast has some absolute gems. The big stuff on Sep 7 and Sep 13 are the ones to circle on the calendar, but keep an eye on the wind closer to the day.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Sun afternoon. Warm (max 32°C on Sat morning, min 24°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 101mm), heaviest during Thu night. Warm (max 28°C on Tue afternoon, min 25°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | |||||||||||||||
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) | SSW 7 | SSW 5 | SSW 7 | SSW 8 | S 7 | S 7 | S 8 | S 8 | S 8 | S 9 | S 8 | SSE 8 | SSE 9 | S 9 | SSE 9 | SSE 11 | SSE 11 | S 10 | SSE 9 | SSE 9 | SSE 8 |
Wave Graph | |||||||||||||||||||||
73 | 61 | 78 | 107 | 40 | 51 | 71 | 51 | 49 | 99 | 113 | 180 | 281 | 263 | 281 | 1452 | 1752 | 3412 | 990 | 589 | 243 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-off | glassy | cross-on | cross | cross-on | cross-on | cross | cross-on | on | on | cross-on | on | cross-on | cross-on | on | on | cross-on | cross-on | cross-off |
High Tide | 6:52PM1.81m | 6:48AM1.84m | 7:14PM1.82m | 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 | ||||||||
Low Tide | 12:33PM0.23m | 00:48AM0.49m | 1:02PM0.31m | 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 | ||||||||
5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | |
— | 6:32 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:25 | — | — | 6:24 | — | |
mm | — | 3 | — | — | 4 | 1 | — | — | — | 3 | 1 | 9 | 6 | 6 | 9 | 4 | 4 | 59 | 9 | 2 | 2 |
Temp °C | 32 | 30 | 27 | 31 | 30 | 27 | 30 | 30 | 26 | 27 | 28 | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 27 | 28 | 27 |
Feels °C | 35 | 34 | 32 | 36 | 34 | 32 | 33 | 33 | 30 | 31 | 32 | 31 | 31 | 32 | 31 | 31 | 31 | 29 | 30 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | SE 9 | ESE 9 | SE 11 | S 7 | S 7 | SE 10 | S 8 | S 8 | S 8 | S 9 | S 8 | SSE 8 | SSE 9 | S 9 | SSE 9 | S 11 | E 14 | SSE 13 | SSE 9 | SSE 9 | SSE 8 |
13 | 8 | 19 | 54 | 40 | 38 | 71 | 51 | 49 | 99 | 113 | 180 | 281 | 263 | 281 | 1104 | 4 | 18 | 990 | 589 | 243 | |
Swell 2 Height (m) Direction Period (s) | SSE 13 | SSE 9 | ESE 9 | SE 10 | SE 10 | SW 9 | SE 10 | SE 10 | SE 10 | ESE 13 | ESE 12 | E 12 | E 11 | ESE 11 | S 12 | ESE 10 | — | SSE 13 | SSW 11 | SSW 10 | SSW 11 |
17 | 8 | 8 | 27 | 36 | 3 | 25 | 25 | 24 | 58 | 51 | 70 | 59 | 37 | 181 | 33 | — | 18 | 163 | 173 | 146 | |
Swell 3 Height (m) Direction Period (s) | E 10 | SE 13 | SSE 9 | ESE 10 | SW 11 | E 10 | E 10 | SSW 10 | SSW 9 | SE 9 | SE 9 | SE 10 | SE 11 | SE 11 | SSW 13 | SE 9 | — | — | E 11 | E 11 | E 10 |
8 | 7 | 8 | 9 | 4 | 2 | 2 | 10 | 16 | 23 | 22 | 15 | 18 | 18 | 149 | 22 | — | — | 22 | 10 | 8 | |
Wind waves Height (m) Direction Period (s) | SSW 7 | SSW 5 | SSW 7 | SSW 8 | SW 3 | S 7 | SSW 7 | SSW 3 | — | — | — | — | ESE 5 | ESE 5 | E 6 | SSE 11 | SSE 11 | S 10 | — | NE 3 | NNE 5 |
73 | 61 | 78 | 107 | 2 | 51 | 49 | 1 | — | — | — | — | 35 | 42 | 64 | 1452 | 1752 | 3412 | — | 4 | 33 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 30 | 0 | 0 | 11 | 2 | 11 | 11 | 2 | 43 | 19 | 11 | 43 | 14 | 11 | 43 | 19 | 369 | 11 | 11 | 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.











