Surf Forecasts:
Asakawa surf forecast from 2 Aug 2026:
- Best quality surf: Wednesday 5 Aug, 6PM (local time) - 20ft (6.0m), 17s period, SE swell with cross-offshore winds.
- Most powerful swell: Friday 7 Aug, 6AM (local time) - 25ft (7.5m), 16s period, SSE swell with 29,137 kJ wave energy.
- Next surfable swell (1★+): Sunday 2 Aug, 6PM (local time) - 3.5ft (1.1m), 16s 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 Sunday (Aug 02) at 6PM. The primary swell is predicted to be 1.1m and 16s period with a secondary swell of 0.4m and 9s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Asakawa in the next 16 days are 7.5m 16s and forecast to arrive on Friday (Aug 07) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Monday (Aug 03) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Sun 2nd Aug) | 3.5ft (1.1m) 16s |
| Best Surf | 6PM (Wed 5th Aug) | 20ft (6.0m) 17s |
| Most Powerful | 6AM (Fri 7th Aug) | 25ft (7.5m) 16s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s look at what Asakawa is cooking up over the next couple weeks. It starts quiet, but there’s a big pulse coming that’ll get your heart racing.
We open with small, clean waves on Sunday morning the 2nd. Water temp is a touch warmer than normal at 84°F. Swell is tiny at 2 ft from the ESE with a very long 18-second period. The combined energy is weak (349), so not much power, but the cross-off wind (NNE at 6 mph) keeps the surface clean. It’s inconsistent here, so don’t expect a non-stop party, but it’s surfable.
Monday the 3rd sees the swell building to 5 ft from the ESE in the morning (16-second period, combined energy 1258). Wind is cross from the east at 6 mph though, leaving small ripples. It’s okay, but nothing special. Tuesday the 4th morning is a real standout: 8 ft from the ESE with a 16-second period and the combined energy jumps to 4561. The wind is glassy calm from the SSE at 3 mph, making for perfect, clean conditions. This is expert territory now, so only for the experienced crew.
Wednesday the 5th brings serious size: 16 ft from the ESE in the morning (17-second period, combined energy 13203) and 16 ft from the SE in the afternoon (17-second period, combined energy 15148). The wind stays light from the ENE to E, but it’s cross to cross-on, so the surface won’t be pristine. Long-period groundswell at 17 seconds works well for a point break like this, but at this size, it’s for experts only. Expect long, powerful lines with big gaps between sets.
Thursday the 6th and Friday the 7th get even heavier. Thursday morning shows 21 ft from the SE (18-second period, combined energy 27340) with a cross wind from the ENE at 16 mph, creating a lumpy chop. Friday morning peaks at 23 ft from the SSE (16-second period, combined energy 41445) – enormous energy. The wind and tide might be favorable, but this swell is just too big for the break. For paddle surfing, it’s a major challenge. Honestly, with these conditions, it might be more interesting for kite surfing than paddle surfing.
Saturday the 8th still has 16 ft from the S (16-second period, combined energy 13917), but the wind stays strong and cross from the ENE. It gets messy. By Sunday the 9th, the swell drops, but the east wind at 16 mph turns it into a cross-on chop. Poor conditions.
After that, the surf settles. Monday the 10th has 5 ft from the SSW, but with east wind and rain, it’s not great. Tuesday the 11th morning offers a nice glassy session with 5 ft from the SSW (14-second period, 1464 combined energy) and calm north wind. Clean and rideable, but small. Wednesday the 12th morning is similar: 4 ft from the SSW (12-second period, 855 combined energy), glassy calm, and fun.
From Thursday the 13th onward, waves drop to 2 ft to 3 ft, mostly poor or ordinary conditions. The period ends with almost no energy.
The standout window is Tuesday the 4th morning with clean 8 ft surf for the experienced, and Wednesday the 5th for experts wanting massive size. After that, it fades. Not much happening in the second week.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Mon afternoon. Warm (max 34°C on Sun afternoon, min 26°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 19mm), heaviest on Fri night. Warm (max 31°C on Wed afternoon, min 25°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Sun 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | ||||||||||||||
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 16 | ESE 15 | ESE 16 | ESE 16 | ESE 17 | ESE 16 | ESE 17 | ESE 17 | SE 17 | SE 17 | SE 17 | SE 18 | SE 17 | SSE 17 | SSE 16 | SSE 16 | S 16 | S 16 | SSW 16 | SSW 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 671 | 621 | 1223 | 1393 | 3606 | 3839 | 5295 | 8395 | 11299 | 14334 | 18179 | 24428 | 26349 | 26982 | 21967 | 18177 | 10546 | 9408 | 7842 | 7138 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-on | on | cross-on | cross-on | on | glassy | cross | cross-on | cross-off | cross-off | cross | cross-off | cross | cross | cross | cross | cross | cross |
High Tide | 8:25PM1.74m | 8:17AM1.67m | 8:51PM1.72m | 9:03AM1.58m | 9:19PM1.69m | 9:59AM1.47m | 9:52PM1.64m | 11:18AM1.36m | 10:35PM1.58m | 1:18PM1.32m | 11:38PM1.53m | 3:21PM1.41m | 1:11AM1.52m | |||||||
Low Tide | 2:22AM0.61m | 2:31PM0.44m | 3:01AM0.57m | 3:03PM0.60m | 3:47AM0.54m | 3:40PM0.78m | 4:44AM0.52m | 4:27PM0.97m | 6:00AM0.50m | 5:43PM1.14m | 7:33AM0.43m | 7:55PM1.22m | ||||||||
 |  | |  |  |  | |  | | | | | | |  | |  | |  | | |
 | — | — | 5:15 | — | — | 5:16 | — | — | 5:16 | — | — | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — |
 | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — |
mm | — | — | — | 1 | 1 | — | — | — | — | — | — | — | 2 | 2 | 1 | 2 | 7 | 5 | 9 | 22 |
Temp °C | 34 | 30 | 30 | 29 | 27 | 30 | 29 | 26 | 30 | 31 | 27 | 30 | 31 | 28 | 29 | 28 | 27 | 27 | 27 | 26 |
Feels °C | 38 | 34 | 34 | 33 | 31 | 34 | 32 | 30 | 32 | 33 | 30 | 31 | 31 | 30 | 29 | 30 | 29 | 30 | 30 | 27 |
Swell 1 Height (m) Direction Period (s) | ESE 16 | ESE 15 | ESE 16 | ESE 16 | ESE 17 | ESE 16 | ESE 17 | ESE 17 | SE 17 | SE 17 | SE 17 | SE 18 | SE 17 | SSE 17 | SSE 16 | SSE 16 | S 16 | S 16 | SSW 16 | SSW 16 |
| kJ | 671 | 621 | 1223 | 1393 | 3606 | 3839 | 5295 | 8395 | 11299 | 14334 | 18179 | 24428 | 26349 | 26982 | 21967 | 18177 | 10546 | 9408 | 7842 | 7138 |
Swell 2 Height (m) Direction Period (s) | S 7 | SE 10 | SE 10 | S 8 | SE 12 | — | — | — | — | — | — | — | — | — | — | — | — | ESE 10 | — | — |
| kJ | 4 | 15 | 15 | 5 | 6 | — | — | — | — | — | — | — | — | — | — | — | — | 1310 | — | — |
Swell 3 Height (m) Direction Period (s) | SSW 8 | SSW 8 | S 8 | S 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 7 | 6 | 5 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNE 4 | N 3 | E 4 | ESE 6 | ESE 6 | E 9 | E 9 | — | — | — | — | — | — | — | E 10 | E 10 | ESE 10 | — | ESE 9 | SE 9 |
| kJ | 8 | 5 | 20 | 114 | 132 | 607 | 726 | — | — | — | — | — | — | — | 2457 | 1478 | 2181 | — | 1672 | 1824 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 41 | 43 | 19 | 0 | 11 | 0 | 22 | 1720 | 57 | 444 | 459 | 494 | 494 | 459 | 473 | 503 | 459 |
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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