
Surf Forecasts:
Asakawa surf forecast from 14 Sep 2026:
- Best quality surf: Monday 21 Sep, 12AM (local time) - 15ft (4.5m), 15s period, SE swell with cross-offshore winds.
- Most powerful swell: Sunday 20 Sep, 12PM (local time) - 15ft (4.5m), 15s period, SE swell with 8,975 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 9PM (local time) - 3.5ft (1.1m), 10s 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 (Sep 14) at 9PM. The primary swell is predicted to be 1.1m and 10s period with a secondary swell of 0.3m and 12s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 4.5m 15s and forecast to arrive on Sunday (Sep 20) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Sunday (Sep 20) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 14th Sep) | 3.5ft (1.1m) 10s |
| Best Surf | 12AM (Mon 21st Sep) | 15ft (4.5m) 15s |
| Most Powerful | 12PM (Sun 20th Sep) | 15ft (4.5m) 15s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, let’s talk Asakawa. It’s a point break that only really works when it’s got the right southeast swell on it, and right now, it’s just not there. We’re in a lull, so don’t expect much for the next few days.
Monday morning (Sept 14) is weak – just a 3ft swell out of the southeast with a short 8-second period. The wind is glassy, so it’s pretty, but there’s no power. Energy is weak at 148. You might get a few ankle-biters, but you’ll be surfing for the love of it, not for the waves.
Tuesday (Sept 15) bumps up a little to 5ft, but the period is still short at 9 seconds. There’s a bit more energy (404), but the storm clouds are hanging around. Still, the wind is glassy, so it could be clean if you can get a window between showers.
Wednesday (Sept 16) and Thursday (Sept 17) drop back down to under 3ft. It’s small, weak, and just not doing much. We’re waiting.
Then, Friday (Sept 18) – that’s when things start to shift. The swell jumps to 8ft out of the east, period stays at 9 seconds, and the energy reads 1281. It’s not huge, but it’s got more push, and the conditions are clean with light winds. This is a solid, fun-size day.
But the real money day is Saturday (Sept 19). That’s when a proper groundswell arrives – 12ft to 13ft out of the east-southeast with a long 15-16 second period. This is the big one. The energy is massive, hitting 6196 on the morning. The wind is cross-offshore, so it should be holding up well. This is expert territory – it’s well overhead and powerful. The long period gives it that extra push, but at this point break, it might want to run a bit straight. Still, if you’re experienced, this is the pick of the bunch.
Sunday (Sept 20) stays big – 15ft out of the southeast with a 15-second period. Energy is off the charts at 8905. But the wind is moderate cross-off, and the report mentions questionable tide conditions, so it might be a bit more of a wild card. Still huge, but maybe not as clean as Saturday morning.
Monday (Sept 21) starts to ease off – 13ft in the morning, dropping to 12ft in the afternoon. The period is still long, so there’s plenty of power, but the tide and wind could make it a bit grindy.
Then, the plug gets pulled. Tuesday (Sept 22) the swell crashes to under 3ft, and we’ve got onshore winds and chop. The window is closed.
From Wednesday (Sept 23) all the way to the end of the month, it’s dead. Tiny, weak swell – 0.7ft to 3ft – with onshore winds, rain, and even a gale showing up on Wednesday. Energy readings are in the gutter. There are a couple of clean-ish periods, but honestly, you’re not going to want to get wet.
So, skip the first half of the week. Get out on Friday (Sept 18) for a clean, fun day. But if you want the real deal, Saturday morning (Sept 19) is your window – big, powerful, and clean. Just make sure you know what you’re doing, because this isn’t for the faint of heart.
Water temp is about 82°F, which is pretty normal for this time of year – boardshorts water.
Circle that Saturday, and keep an eye on the tide. That’s the one.
Rusty out.
Short Range ForecastHeavy rain (total 37mm), heaviest during Tue afternoon. Warm (max 29°C on Mon morning, min 22°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Thu morning, min 23°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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) | SE 8 | SE 8 | SE 10 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 9 | SE 9 | SE 9 | ESE 9 | ESE 8 | E 9 | E 9 | ESE 16 | ESE 16 | ESE 15 | SE 15 | SE 15 | SE 15 | SE 15 |
Wave Graph | |||||||||||||||||||||
132 | 138 | 235 | 338 | 231 | 178 | 115 | 96 | 79 | 79 | 94 | 207 | 888 | 747 | 1809 | 6196 | 6312 | 7043 | 8905 | 8338 | 8543 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | glassy | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 7:22PM1.79m | 8:09AM1.67m | 7:43PM1.73m | 8:48AM1.54m | 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 | ||||||||
Low Tide | 1:24PM0.57m | 1:46AM0.29m | 1:50PM0.72m | 2:19AM0.34m | 2:13PM0.87m | 2:54AM0.42m | 2:34PM1.00m | 3:36AM0.53m | 2:53PM1.12m | 4:39AM0.64m | 2:46PM1.23m | 6:31AM0.69m | 8:58PM1.25m | ||||||||
5:43 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | 5:48 | — | — | |
— | 6:10 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — | — | 6:04 | — | — | 6:02 | — | |
mm | — | 2 | 8 | 4 | 9 | 3 | 8 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 29 | 24 | 26 | 27 | 24 | 25 | 24 | 23 | 27 | 27 | 23 | 27 | 26 | 24 | 26 | 27 | 23 | 25 | 26 | 24 |
Feels °C | 32 | 31 | 28 | 30 | 32 | 27 | 28 | 27 | 25 | 27 | 28 | 25 | 28 | 29 | 27 | 27 | 27 | 24 | 25 | 26 | 25 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SE 8 | SE 10 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 9 | SE 9 | SE 9 | ESE 9 | E 12 | ESE 9 | ESE 9 | ESE 16 | ESE 16 | ESE 15 | SE 15 | SE 15 | SE 15 | SE 15 |
132 | 138 | 235 | 338 | 231 | 178 | 115 | 96 | 79 | 79 | 94 | 3 | 380 | 367 | 1809 | 6196 | 6312 | 7043 | 8905 | 8338 | 8543 | |
Swell 2 Height (m) Direction Period (s) | E 13 | E 12 | E 12 | E 12 | E 13 | E 13 | E 12 | S 7 | E 13 | E 12 | E 12 | S 6 | SE 16 | SE 17 | ESE 10 | — | — | — | — | — | — |
13 | 12 | 12 | 49 | 14 | 12 | 3 | 1 | 3 | 3 | 3 | 1 | 11 | 148 | 510 | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | S 6 | S 7 | S 7 | E 15 | S 6 | S 7 | E 14 | S 7 | S 7 | S 7 | — | — | S 11 | S 10 | S 10 | — | — | — | — | — | — |
3 | 1 | 1 | 17 | 1 | 1 | 4 | 1 | 1 | 1 | — | — | 2 | 2 | 8 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NNE 3 | NE 4 | NNE 4 | NE 4 | NE 4 | ESE 8 | E 9 | E 9 | E 10 | — | — | N 4 | NNE 4 | NNE 5 | NNE 5 |
— | — | — | — | — | — | 4 | 10 | 13 | 18 | 5 | 207 | 888 | 747 | 1307 | — | — | 26 | 39 | 83 | 93 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 19 | 0 | 0 | 0 | 0 | 43 | 0 | 43 | 43 | 0 |
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.










