
Surf Forecasts:
Asakawa surf forecast from 16 Sep 2026:
- Best quality surf: Friday 18 Sep, 6PM (local time) - 8ft (2.4m), 10s period, E swell with glassy winds.
- Most powerful swell: Saturday 19 Sep, 9PM (local time) - 10ft (3.0m), 13s period, ESE swell with 3,365 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 9PM (local time) - 2.5ft (0.8m), 9s period with ESE 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 Wednesday (Sep 16) at 9PM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.1m and 13s. 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 3.0m 13s and forecast to arrive on Saturday (Sep 19) at 9PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Sunday (Sep 20) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 16th Sep) | 2.5ft (0.8m) 9s |
| Best Surf | 6PM (Fri 18th Sep) | 8ft (2.4m) 10s |
| Most Powerful | 9PM (Sat 19th Sep) | 10ft (3.0m) 13s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
G’day, it’s Rusty. Let’s be straight with you – the next couple of days are pretty ordinary, but there’s a proper pulse coming through later in the week that’ll get the heart rate up. We’re looking at a slow start, a solid window of decent surf, and then a fade-out into early October. Hang in there.
Right now, Wednesday afternoon has a bit of ankle-to-knee-high energy out of the ESE at 2.6ft with a 9-second period. It’s surfable but nothing to write home about – the cross-off breeze keeps it clean, but the swell energy is weak (98). Water temp sits at 82.9°, which is a touch warmer than normal for this time of year – you won’t need a wetsuit, that’s for sure.
Thursday rolls in with similar dribble – 2.3ft to 2.6ft, ESE, weak energy (83-98). The morning has a bit more breeze at 12 mph from the NNE, but it’s still cross-off and clean. Honestly, you’re scratching for anything rideable.
Then Friday morning things start to wake up. Swell jumps to 7.5ft out of the E with a 9-second period – that’s a big step up. The combined energy goes moderate-strong at 1191, so there’s real push in the water. But the wind is cross, light at 6 mph, and the conditions are marginal – likely lumpy and tricky. By afternoon it’s cross-on and the period improves slightly to 10 seconds, but the energy jumps to 1571. Still, the quality is questionable – not the day to be heroic unless you’re keen on a scrap.
Now, here’s where it gets interesting. Saturday the 19th is the standout of the whole run. Morning sees 7.5ft from the ESE at 13 seconds – that’s proper groundswell, setting up nicely at Asakawa (Tropical Islands). The combined energy is strong at 1789, and with a light NNE cross-off breeze, it’s clean. This is a point break, and that long-period swell is going to wrap and reel – pure fun for experienced surfers. By afternoon it jumps to 9.8ft at 14 seconds, energy roaring up to 3248. That’s powerful, heavy stuff – too much for beginners, and even intermediates will be pushing it. But for the crew who know what they’re doing, this is the best session on offer. Just be aware, the crowd factor is there – it’s “sometimes” busy, so pick your peak.
Sunday the 20th keeps the quality high. Morning has 8.2ft from the ESE at 13 seconds, energy at 2335, with a gentle offshore from the N – that’s clean, lined-up surf. Afternoon is similar, 8.2ft at 13 seconds, energy 2440, offshore from the NNW. This is still excellent, big and clean – another day for the experienced crowd. Monday the 21st eases off to 4.9ft at 12 seconds in the morning – good conditions, energy down to 565 – but it’s still a fun, clean session before the drop in the afternoon.
From Monday afternoon through Tuesday, the swell fades fast – down to 2.9ft, then 1ft, then 0.7ft by Tuesday afternoon. The energy just falls off a cliff (238 down to 28 and 17). Conditions stay clean but there’s nothing to ride. Wednesday the 23rd is flat – 0.7ft, glassy in the morning, but choppy by the afternoon with a SSW cross-on. Thursday the 24th you’re still scratching – 1ft, glassy, no push.
There’s a bit of a lifeline late in the week. Friday the 25th is still poor, with tiny waves and weak energy. But Saturday the 26th brings a morning glass-off – 3.2ft from the SSE at 10 seconds, with light glassy conditions and energy at 385. It’s not big, but it’s clean and rideable – a nice little reset after the flat spell. The afternoon turns cross-on and choppy, so get your waves in early.
Sunday the 27th is back to small – 3.6ft at 10 seconds, cross-off but weak energy (255-261). Monday the 28th sees a bit more life – 4.6ft in the morning from the S at 11 seconds, then the afternoon goes glassy with 6.2ft at 13 seconds, energy up to 1205. That’s a lovely window – clean, glassy, a proper little pulse to finish off the month. Tuesday the 29th gets messy – 6.9ft to 5.6ft from the S, but cross winds and chop make it marginal, so don’t expect much quality.
Then it fades again. Wednesday the 30th has 3.6ft to 2.9ft, offshore but weak. By October 1st, it’s pretty much done – 1.3ft, then 1ft, with tiny energy readings of 26 and 18. You’re
Short Range ForecastLight rain (total 8mm), mostly falling on Wed night. Warm (max 28°C on Sat morning, min 20°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Sat afternoon, min 19°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Wed 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | ||||||||||||||
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) | ESE 9 | SE 9 | SE 9 | ESE 9 | ESE 8 | E 9 | E 10 | E 10 | ESE 13 | ESE 14 | ESE 13 | ESE 13 | ESE 13 | ESE 12 | ESE 12 | ESE 11 | SE 10 | E 10 | E 9 | S 8 |
Wave Graph | ||||||||||||||||||||
96 | 79 | 79 | 94 | 264 | 809 | 1047 | 818 | 1783 | 3242 | 2817 | 2329 | 2440 | 1140 | 559 | 164 | 23 | 16 | 6 | 6 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-on | off | cross-off | cross-off | cross-off | off | off | off | off | cross-off | off | cross-off | cross-off | glassy |
High Tide | 8:04PM1.66m | 9:32AM1.40m | 8:24PM1.57m | 10:38AM1.28m | 8:45PM1.47m | 1:48PM1.23m | 9:10PM1.37m | 3:50PM1.33m | 11:43PM1.27m | 4:02PM1.43m | 2:13AM1.33m | 4:20PM1.53m | ||||||||
Low Tide | 2:54AM0.42m | 2:34PM1.00m | 3:36AM0.53m | 2:53PM1.12m | 4:39AM0.64m | 2:46PM1.23m | 6:31AM0.69m | 8:58PM1.25m | 8:18AM0.63m | 9:37PM1.13m | 9:16AM0.53m | 10:01PM0.99m | ||||||||
— | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | 5:48 | — | — | 5:48 | — | — | 5:48 | — | — | |
6:07 | — | — | 6:07 | — | — | 6:06 | — | — | 6:04 | — | — | 6:02 | — | — | 6:01 | — | — | 6:00 | — | |
mm | 3 | 3 | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 22 | 27 | 27 | 24 | 26 | 26 | 24 | 28 | 29 | 24 | 28 | 28 | 23 | 27 | 28 | 21 | 27 | 27 | 22 |
Feels °C | 26 | 24 | 27 | 27 | 26 | 27 | 27 | 26 | 28 | 29 | 24 | 28 | 28 | 23 | 27 | 28 | 20 | 27 | 27 | 23 |
Swell 1 Height (m) Direction Period (s) | ESE 9 | SE 9 | SE 9 | ESE 9 | E 12 | ESE 9 | ESE 10 | ESE 10 | ESE 13 | ESE 14 | ESE 13 | ESE 13 | ESE 13 | ESE 12 | ESE 12 | ESE 11 | SE 10 | E 10 | ESE 8 | NE 4 |
96 | 79 | 79 | 94 | 3 | 380 | 522 | 388 | 1783 | 3242 | 2817 | 2329 | 2440 | 1140 | 559 | 164 | 23 | 16 | 6 | 3 | |
Swell 2 Height (m) Direction Period (s) | S 7 | E 13 | E 12 | E 12 | S 6 | S 11 | S 10 | S 10 | S 9 | S 9 | S 8 | S 9 | — | S 9 | S 9 | S 9 | E 11 | ESE 9 | S 8 | S 8 |
1 | 3 | 3 | 3 | 1 | 2 | 2 | 7 | 6 | 6 | 6 | 6 | — | 6 | 6 | 6 | 20 | 7 | 5 | 5 | |
Swell 3 Height (m) Direction Period (s) | S 7 | S 7 | S 7 | S 7 | — | — | — | SE 11 | — | — | — | — | — | SE 16 | — | ESE 10 | S 8 | S 8 | E 9 | ESE 8 |
1 | 1 | 1 | 1 | — | — | — | 5 | — | — | — | — | — | 10 | — | 68 | 6 | 5 | 6 | 6 | |
Wind waves Height (m) Direction Period (s) | NNE 4 | NNE 4 | NNE 4 | NE 4 | ESE 8 | E 9 | E 10 | E 10 | N 3 | NE 4 | NNE 4 | NNE 5 | N 5 | N 5 | NNE 5 | NNE 5 | NE 5 | NNE 5 | NE 5 | N 4 |
8 | 13 | 21 | 9 | 264 | 809 | 1047 | 818 | 7 | 11 | 30 | 33 | 80 | 13 | 5 | 17 | 35 | 17 | 17 | 15 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 43 | 0 | 19 | 19 | 19 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 43 | 30 | 289 |
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.










