Surf Forecasts:
Asakawa surf forecast from 7 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 12AM (local time) - 6ft (1.8m), 9s period, S swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 6AM (local time) - 8ft (2.5m), 9s period, SSE swell with 1,098 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 9PM (local time) - 5ft (1.6m), 9s 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 07) at 9PM. The primary swell is predicted to be 1.6m and 9s period with a secondary swell of 0.8m and 11s. 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 2.5m 9s and forecast to arrive on Wednesday (Sep 09) at 6AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Wednesday (Sep 09) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 7th Sep) | 5ft (1.6m) 9s |
| Best Surf | 12AM (Wed 9th Sep) | 6ft (1.8m) 9s |
| Most Powerful | 6AM (Wed 9th Sep) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s take a look at what’s on offer.
Alright, let’s be straight with you – the next 16 days are a bit of a mixed bag at Asakawa. We’ve got some windows of opportunity, but nothing that’s screaming epic. The water is sitting at 84°, which is a touch warmer than normal for this time of year, so you won’t need a thick suit.
The first real chance to get wet comes on Monday, September 7th. It’s not a classic, with a 5ft to 6ft SE swell pushing through, but the wind is a cross-off from the N to NNE, keeping things clean. The combined energy is moderate, around 566 to 573. It’s a bit raw, but surfable.
Tuesday, the 8th, actually looks like the pick of the early week. The swell drops a touch to 4ft, but it switches to a clean S direction. The wind is a light cross-off from the NNE, and the combined energy is still decent at 471 to 483. This is the best quality you’ll see in the first week – clean, fun little waves.
Now, Wednesday the 9th gets a bit tricky. The swell jumps up to 8ft from the SSE, which is a bit of a handful, and the wind swings onshore from the SSE with a risk of thunderstorms. The combined energy spikes to 841, but the quality is poor. It’s going to be a messy, lumpy day. Not for beginners.
From Thursday the 10th through to the end of the first week, it really fades. Swell drops under 3ft, and the energy falls off a cliff. There’s a brief moment on Friday the 11th with glassy conditions and 3ft, but it’s weak. The 12th and 13th are similar – small, inconsistent, and mostly flat.
The second week doesn’t offer much hope. There’s a tiny pulse on Tuesday the 15th with 4ft ESE swell and glassy conditions, but it’s fleeting and the energy is low at 270. After that, it’s a long, slow fade into tiny, weak waves for the rest of the period. The 19th has a 4ft SSW swell, but it’s a short period and the wind is onshore.
Honestly, if you’re looking for the best of a bad bunch, aim for Tuesday the 8th. That’s the standout. It’s not big, but it’s clean, and the direction is right for Asakawa. The rest is mostly for the die-hards or those happy to sit on a longboard in small, clean conditions. It’s a quiet run.
Rusty.
Short Range ForecastHeavy rain (total 58mm), heaviest during Wed morning. Warm (max 27°C on Mon afternoon, min 23°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 17mm), heaviest on Thu afternoon. Warm (max 28°C on Sat morning, min 22°C on Thu afternoon). Wind will be generally light. | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
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 9 | SE 9 | SE 8 | S 9 | S 9 | S 9 | SSE 9 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 8 | SSE 7 | SSE 7 | S 7 | SSE 7 | S 7 | ESE 9 | S 11 | ESE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 406 | 540 | 283 | 287 | 280 | 544 | 829 | 379 | 154 | 69 | 147 | 143 | 101 | 84 | 66 | 47 | 49 | 36 | 55 | 86 | 157 |
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-off | cross-off | on | cross-off | cross-off | cross-off | cross-off | glassy | glassy | glassy | glassy | glassy | on | glassy | glassy | on | glassy |
High Tide | 4:19PM1.58m | 2:54AM1.54m | 4:52PM1.68m | 3:59AM1.68m | 5:21PM1.76m | 4:49AM1.79m | 5:47PM1.81m | 5:34AM1.87m | 6:13PM1.84m | 6:15AM1.89m | 6:37PM1.84m | 6:54AM1.85m | 7:00PM1.83m | ||||||||
Low Tide | 9:45PM1.08m | 9:55AM0.25m | 10:28PM0.91m | 10:41AM0.18m | 11:04PM0.73m | 11:20AM0.16m | 11:38PM0.57m | 11:55AM0.21m | 00:11AM0.43m | 12:27PM0.30m | 00:43AM0.33m | 12:57PM0.43m | 1:15AM0.29m | ||||||||
 |  |  |  | |  |  | |  |  | |  | | | |  | |  | | | | |
 | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — |
 | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — |
mm | 6 | 1 | — | 3 | 2 | 23 | 22 | 1 | — | — | 10 | 2 | 1 | 2 | — | — | 1 | 1 | 1 | 2 | — |
Temp °C | 25 | 27 | 25 | 26 | 27 | 27 | 27 | 26 | 25 | 23 | 22 | 23 | 26 | 26 | 24 | 28 | 28 | 26 | 28 | 28 | 25 |
Feels °C | 27 | 28 | 27 | 29 | 31 | 32 | 31 | 28 | 26 | 23 | 23 | 27 | 31 | 31 | 28 | 33 | 33 | 32 | 32 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | SE 9 | SE 9 | SE 8 | S 9 | S 9 | S 9 | SSE 9 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SSE 8 | SSE 7 | SSE 7 | S 7 | SSE 7 | S 7 | ESE 9 | SE 9 | ESE 9 |
| kJ | 406 | 540 | 283 | 287 | 280 | 544 | 829 | 379 | 154 | 69 | 147 | 143 | 101 | 84 | 66 | 47 | 49 | 36 | 55 | 81 | 157 |
Swell 2 Height (m) Direction Period (s) | SSE 9 | S 11 | S 10 | SE 8 | SE 8 | SE 8 | E 18 | E 18 | SSW 8 | SSE 8 | E 15 | ESE 11 | ESE 7 | ESE 11 | SE 10 | ESE 5 | SE 10 | ESE 10 | S 7 | S 11 | S 10 |
| kJ | 156 | 22 | 190 | 145 | 163 | 192 | 6 | 6 | 13 | 65 | 4 | 12 | 15 | 11 | 24 | 5 | 25 | 35 | 15 | 86 | 98 |
Swell 3 Height (m) Direction Period (s) | SW 10 | SSW 11 | SSW 11 | ESE 10 | ESE 10 | — | E 18 | — | E 16 | S 8 | E 18 | E 15 | SSW 7 | E 14 | E 14 | SE 10 | E 13 | E 14 | S 12 | S 7 | E 13 |
| kJ | 4 | 11 | 22 | 39 | 40 | — | 6 | — | 5 | 1 | 6 | 17 | 11 | 15 | 36 | 24 | 32 | 35 | 45 | 15 | 13 |
Wind waves Height (m) Direction Period (s) | NNE 5 | NE 4 | NE 4 | NNE 4 | NNE 3 | NNE 3 | NNE 4 | NNE 4 | NNE 5 | NNE 5 | NNE 4 | NNE 3 | NE 3 | NE 3 | — | E 5 | E 4 | E 5 | — | — | — |
| kJ | 42 | 17 | 16 | 8 | 5 | 7 | 5 | 18 | 97 | 50 | 9 | 2 | 2 | 6 | — | 16 | 8 | 2 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 14 | 43 | 0 | 0 | 0 | 0 | 11 | 14 | 14 | 43 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 0 | 0 | 19 | 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.
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