Surf Forecasts:
Asakawa surf forecast from 3 Sep 2026:
- Best quality surf: Monday 7 Sep, 12AM (local time) - 13ft (4.0m), 11s period, E swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 12AM (local time) - 13ft (4.0m), 11s period, E swell with 3,776 kJ wave energy.
- Next surfable swell (1★+): Friday 4 Sep, 6AM (local time) - 5ft (1.5m), 10s 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 Friday (Sep 04) at 6AM. The primary swell is predicted to be 1.5m and 10s period with a secondary swell of 0.4m and 10s. 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 11s and forecast to arrive on Monday (Sep 07) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Sep 09) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Fri 4th Sep) | 5ft (1.5m) 10s |
| Best Surf | 12AM (Mon 7th Sep) | 13ft (4.0m) 11s |
| Most Powerful | 12AM (Mon 7th Sep) | 13ft (4.0m) 11s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at the near future for Asakawa.
Right off the bat, we’re looking at a patchy start. Friday the 4th offers some clean, cross-off swell with 5 feet from the south, but the conditions are a bit rough with heavy rain in the afternoon, so it’s not a standout. The real window opens up as we roll into the following week.
Monday morning, September 7th, is where things get spicy. We’ve got a solid 7 feet of ESE groundswell, with a nice long 11-second period, and the wind is a light cross-off breeze from the NNE. That’s going to be clean and powerful, with moderate wave energy pumping through. This is one of the best bets in the whole period.
Then, hold onto your boards. Wednesday the 9th looks absolutely electric. The morning brings glassy conditions with 8 feet of SSE swell, and the energy is really starting to build. But the afternoon is the real gem – 10 feet of SSE groundswell, still glassy, and the energy is massive. This is high-end, expert-level stuff. The long period (11 seconds) will mean long lulls between sets, but the waves themselves will be deep and powerful. This is a true standout for experienced surfers only.
We’ll see a drop-off into the second week, but Sunday the 13th and Monday the 14th bring a fresh pulse of 6 to 6 feet E/ESE swell. The mornings are clean with light offshore winds, especially on the 14th with a glassy start. This is a good, solid session for the intermediate crowd.
After that, it fades. The 15th has a glassy morning but the swell backs off, and from the 16th onward, it’s a sad, flat run of tiny, weak surf with poor energy readings. A blank stretch sets in from the 16th to the 20th, which is a pretty normal quiet spell for the area.
At Asakawa, the water temp is about average for this time of year, nothing unusual to report. Keep in mind this spot is a point break and it’s inconsistent, so you need to be on it when the swell shows. Crowds are sometimes an issue, so the early morning glass-offs on the 7th and 9th will be your best chance to get some clean ones.
Rusty.
Short Range ForecastHeavy rain (total 96mm), heaviest during Fri afternoon. Warm (max 27°C on Sun morning, min 20°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 42mm), heaviest during Wed morning. Warm (max 29°C on Tue morning, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | ||||||||||||||
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) | SSE 10 | S 10 | S 10 | S 9 | ESE 8 | ESE 7 | ESE 8 | ESE 9 | ESE 10 | E 11 | ESE 11 | ESE 11 | SE 11 | SE 9 | SE 9 | SSE 11 | SSE 10 | SSE 11 | SSE 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 394 | 408 | 362 | 241 | 96 | 70 | 220 | 427 | 804 | 3776 | 908 | 656 | 263 | 166 | 179 | 892 | 1234 | 1749 | 530 |
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 | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | glassy | glassy | cross-off |
High Tide | 9:02PM1.65m | 11:18AM1.35m | 9:43PM1.56m | 1:51PM1.33m | 11:00PM1.46m | 3:35PM1.46m | 1:17AM1.44m | 4:19PM1.58m | 2:54AM1.54m | 4:52PM1.68m | 3:59AM1.68m | 5:21PM1.76m | |||||||
Low Tide | 4:13AM0.42m | 3:51PM1.11m | 5:37AM0.48m | 5:35PM1.26m | 7:28AM0.46m | 8:34PM1.23m | 8:55AM0.35m | 9:45PM1.08m | 9:55AM0.25m | 10:28PM0.91m | 10:41AM0.18m | 11:04PM0.73m | |||||||
 |  | |  |  |  |  |  | | | | |  | | |  | |  | | |
 | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — |
 | 6:25 | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — |
mm | 1 | 24 | 44 | 22 | 1 | — | 4 | — | — | 1 | 1 | — | — | — | 1 | 10 | 15 | 14 | 14 |
Temp °C | 25 | 24 | 22 | 21 | 23 | 24 | 24 | 27 | 27 | 25 | 27 | 26 | 25 | 29 | 27 | 25 | 25 | 26 | 24 |
Feels °C | 28 | 26 | 23 | 22 | 23 | 24 | 25 | 28 | 27 | 26 | 28 | 28 | 28 | 30 | 29 | 29 | 30 | 32 | 26 |
Swell 1 Height (m) Direction Period (s) | SSE 10 | S 10 | S 10 | S 9 | ESE 8 | ESE 7 | ESE 8 | ESE 9 | ESE 12 | ESE 11 | ESE 11 | ESE 11 | SE 11 | SE 9 | SE 9 | SSE 11 | SSE 10 | SSE 11 | SSE 9 |
| kJ | 394 | 408 | 362 | 241 | 96 | 70 | 220 | 427 | 89 | 1485 | 908 | 656 | 263 | 166 | 179 | 892 | 1234 | 1749 | 530 |
Swell 2 Height (m) Direction Period (s) | SE 10 | SE 9 | SE 9 | E 7 | SSW 10 | S 7 | SSW 8 | SSW 9 | SSW 9 | SSW 9 | S 9 | SSW 11 | S 11 | SSW 10 | S 10 | E 19 | E 18 | E 18 | E 16 |
| kJ | 15 | 23 | 21 | 69 | 61 | 40 | 54 | 30 | 16 | 17 | 26 | 39 | 85 | 144 | 73 | 7 | 6 | 6 | 5 |
Swell 3 Height (m) Direction Period (s) | ESE 10 | E 9 | E 9 | SE 9 | S 8 | SSW 9 | — | — | — | — | SW 10 | SSW 10 | E 10 | E 9 | S 12 | — | — | — | S 9 |
| kJ | 18 | 16 | 7 | 12 | 33 | 32 | — | — | — | — | 4 | 9 | 78 | 79 | 49 | — | — | — | 2 |
Wind waves Height (m) Direction Period (s) | NE 3 | NNE 4 | NE 5 | N 4 | NNE 4 | NNE 4 | NE 3 | NE 3 | ESE 10 | E 11 | NNE 4 | NNE 4 | NE 5 | NE 4 | NNE 4 | NNE 4 | NNE 5 | NNE 5 | NNE 6 |
| kJ | 3 | 13 | 60 | 7 | 26 | 30 | 3 | 6 | 804 | 3776 | 14 | 10 | 11 | 21 | 11 | 19 | 66 | 94 | 13 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 43 | 0 | 43 | 43 | 22 | 22 | 1862 | 0 | 0 | 0 | 0 | 0 | 22 | 0 | 0 | 0 | 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.
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