Surf Forecasts:
Asakawa surf forecast from 31 Aug 2026:
- Best quality surf: Monday 7 Sep, 3PM (local time) - 11ft (3.5m), 11s period, E swell with glassy winds.
- Most powerful swell: Monday 7 Sep, 3PM (local time) - 11ft (3.5m), 11s period, E swell with 2,998 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 6AM (local time) - 2ft (0.6m), 8s 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 Tuesday (Sep 01) at 6AM. The primary swell is predicted to be 0.6m and 8s period with a secondary swell of 0.3m and 14s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 3.5m 11s and forecast to arrive on Monday (Sep 07) at 3PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Thursday (Sep 03) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Tue 1st Sep) | 2ft (0.6m) 8s |
| Best Surf | 3PM (Mon 7th Sep) | 11ft (3.5m) 11s |
| Most Powerful | 3PM (Mon 7th Sep) | 11ft (3.5m) 11s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright, let’s break it down. The first few days are a total washout. Monday, August 31st, is tiny, messy, and cross-onshore – total rubbish. Tuesday, September 1st, is even worse, with onshore wind and no swell. Wednesday the 2nd gets a little size, but it’s still cross-onshore and just marginal. We finally get a clean window on Thursday, September 3rd. The morning is glassy with a 4ft swell from the SSE, but it’s weak. The afternoon is the real start – glassy wind, the swell holding at 4ft from the SSE with a 9-second period, and the combined energy climbing to a moderate level. It’s surfable.
Friday, September 4th, starts with a solid 6ft SSE swell, clean cross-offshore wind, and strong energy. The morning is the only session before the wind kicks up to 15 mph from the north in the afternoon. Saturday the 5th is a dud – clean but tiny.
Now, Sunday, September 6th, is a standout. The morning delivers a clean 7ft swell from the east with an 8-second period, but the combined energy is strong. Light cross-offshore wind, clean faces. A bit much for a beginner, but a solid day for an intermediate. The afternoon turns cross-onshore and messy.
The main event is Monday, September 7th. Glassy conditions, no wind, and a 10ft swell from the east. By the afternoon, it’s cranking 12ft from the east with an 11-second period, and the combined energy is massive. This is expert-only territory – over 8ft, it’s for the experienced crew only. The water is warm at 84°, a touch warmer than normal for this time of year.
Tuesday the 8th of September holds on with a 7ft ESE swell, clean cross-offshore wind, and strong energy. The rest of that week into the 10th of September offers solid, clean waves in the 6ft to 8ft range with good energy. The 10th of September afternoon gets a bit tricky with the wind and a 8ft SE swell, but it’s still clean.
We then hit a rough patch from the 11th of September. Friday the 11th gets crushed by a strong onshore wind and a 10ft swell – that’s a kite-surfing setup, not a paddle one. The 12th is similar, messy and windy. The 13th is clean but small and weak. Finally, on Monday, September 14th, we get a reprieve. The morning has a clean, offshore wind from the NNW, with a 3ft SSW swell and a long 11-second period. The energy is moderate. The afternoon goes glassy. It’s not huge, but it’s clean and surfable.
The best of the best is the 7th of September, with the 6th of September morning as a close second. The 14th of September is a nice little clean-up day.
Rusty
Short Range ForecastLight rain (total 7mm), mostly falling on Wed morning. Warm (max 31°C on Mon morning, min 25°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 119mm), heaviest during Fri morning. Warm (max 29°C on Sat afternoon, min 21°C on Fri afternoon). Winds increasing (calm on Thu morning, fresh winds from the NNE by Fri afternoon). | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | |||||||||||||||
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 9 | S 8 | SE 10 | ESE 13 | E 12 | S 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 9 | SSE 10 | SSE 9 | S 8 | S 8 | ESE 8 | ESE 8 | ESE 8 | E 8 | ESE 10 | ESE 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 77 | 51 | 31 | 59 | 80 | 131 | 190 | 190 | 197 | 185 | 289 | 788 | 586 | 316 | 138 | 48 | 55 | 217 | 565 | 663 | 990 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | on | on | glassy | cross-on | cross-on | glassy | glassy | glassy | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on |
High Tide | 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 | 1:51PM1.33m | 11:00PM1.46m | 3:35PM1.46m | 1:17AM1.44m | ||||||||
Low Tide | 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 | 5:37AM0.48m | 5:35PM1.26m | 7:28AM0.46m | 8:34PM1.23m | ||||||||
 | |  | | |  |  |  |  | | |  |  | | | | | | |  | | |
 | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — |
 | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — |
mm | — | — | — | — | — | — | 2 | 1 | 4 | 2 | 4 | 2 | 59 | 46 | 6 | — | — | — | — | 2 | — |
Temp °C | 31 | 31 | 26 | 30 | 30 | 26 | 30 | 29 | 26 | 27 | 28 | 26 | 24 | 23 | 22 | 28 | 29 | 23 | 27 | 25 | 24 |
Feels °C | 33 | 34 | 30 | 32 | 33 | 31 | 33 | 33 | 31 | 32 | 34 | 30 | 27 | 23 | 21 | 26 | 27 | 23 | 28 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | S 8 | S 8 | S 8 | S 8 | S 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 9 | SSE 10 | SSE 9 | S 8 | S 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | SSW 9 | SSW 9 |
| kJ | 77 | 51 | 31 | 32 | 42 | 131 | 190 | 190 | 197 | 185 | 289 | 788 | 586 | 316 | 138 | 48 | 55 | 217 | 250 | 28 | 16 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 10 | SSW 9 | ESE 13 | E 12 | E 12 | E 11 | E 11 | ESE 11 | ESE 10 | ESE 10 | ESE 10 | ESE 8 | ESE 8 | ESE 9 | SSW 8 | SSW 7 | SSW 10 | SSW 10 | — | S 10 |
| kJ | 25 | 25 | 31 | 59 | 80 | 70 | 61 | 59 | 37 | 33 | 33 | 18 | 23 | 38 | 67 | 34 | 18 | 56 | 36 | — | 7 |
Swell 3 Height (m) Direction Period (s) | E 10 | SSW 10 | SE 10 | SE 9 | SE 9 | SE 10 | SE 10 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | E 10 | SW 9 | SW 9 | SSE 7 | SSE 7 | — | SE 12 | — | — |
| kJ | 2 | 10 | 24 | 23 | 22 | 14 | 17 | 18 | 17 | 16 | 15 | 15 | 18 | 43 | 41 | 27 | 9 | — | 38 | — | — |
Wind waves Height (m) Direction Period (s) | SSW 7 | SSW 3 | — | — | — | ENE 6 | — | — | — | — | — | NNE 4 | NNE 4 | NNE 3 | NNE 4 | NNE 4 | NE 4 | — | E 8 | ESE 10 | ESE 10 |
| kJ | 49 | 4 | — | — | — | 11 | — | — | — | — | — | 28 | 14 | 5 | 8 | 34 | 23 | — | 565 | 663 | 990 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 19 | 30 | 2 | 11 | 475 | 0 | 43 | 19 | 0 | 0 | 0 | 0 | 0 | 43 | 0 | 14 | 43 | 0 | 0 | 41 | 19 |
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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