
Surf Forecasts:
Asakawa surf forecast from 5 Sep 2026:
- Best quality surf: Saturday 5 Sep, 9PM (local time) - 5ft (1.6m), 7s period, E swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 9PM (local time) - 7.5ft (2.3m), 10s period, ESE swell with 1,124 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 9PM (local time) - 5ft (1.6m), 7s period with E 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 Saturday (Sep 05) at 9PM. The primary swell is predicted to be 1.6m and 7s period with a secondary swell of 1.0m and 7s. Another secondary swell of 0.6m and 9s is also forecast. 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 2.3m 10s and forecast to arrive on Sunday (Sep 06) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 5s period and expected on Monday (Sep 07) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 5th Sep) | 5ft (1.6m) 7s |
| Best Surf | 9PM (Sat 5th Sep) | 5ft (1.6m) 7s |
| Most Powerful | 9PM (Sun 6th Sep) | 7.5ft (2.3m) 10s |
Table - best surf conditions forecast for Asakawa over the next 16 days.
The Lowdown
G’day, Rusty here, checkin’ in from the Asakawa (point) corner. Look, I’ll level with you – this forecast is a bit of a mixed bag. We’ve got some solid swell pulses punchin’ through, but the conditions are gonna be a real head-scratcher for most of it. The water’s a touch warmer than normal for this time of year, sittin’ at 85°, so at least you won’t need a wetsuit.
The first real chance to get wet hits Saturday afternoon, the 5th of September. It’s nothin’ to write home about – just 3 ft of SSW swell, period around 9 seconds, and the wave energy is weak (165). The wind is a cross-offshore from the NE, so it’ll be clean, but the surf is just ordinary. A real shoulder-shrugger.
Sunday, the 6th, is where things get interesting, but not in a good way. The morning sees a jump to 7 ft from the ESE, period 9 seconds, and the energy is strong (829). By the afternoon, it’s 8 ft (1152 energy). That’s a lot of power, but it’s pumpin’ with heavy rain and a 12 mph cross-off wind. The surf is labeled as marginal due to questionable tides. This is expert territory only – way too big for beginners.
Monday the 7th keeps the size up with 7 ft in the morning (924 energy) and 7 ft in the afternoon (759 energy), both from the SE. Wind is still a cross-off from the north, but the forecast is mixed with light rain. It’s still a messy, marginal setup best left to the pros.
Tuesday the 8th sees the swell drop back to a more manageable 4 ft in the morning (421 energy), then 3 ft (372 energy) in the afternoon. Wind is cross-off and clean, but the scores are low. It’s surfable, but nothin’ special.
Wednesday the 9th brings another pulse – 7 ft from the SSE in the morning (607 energy), droppin’ to 6 ft in the afternoon (472 energy). The wind is cross-off, but it’s rainin’ and the period is short at 8 seconds. That’s a junky, short-period chop.
From Thursday the 10th right through to Saturday the 20th of September, it’s a long, drawn-out run of poor surf. The energy drops right off into the weak zone (values of 211 and below), and the swell heights hover around 4 ft or less. There’s a little blip on Sunday the 13th – a 3 ft, 11-second-period groundswell from the south (273 energy) with light cross-off winds. The longer period will give it some shape, but it’s a tiny wave.
The real standouts, if you can wait, are on Sunday the 13th morning and again on Tuesday the 15th morning. The 13th has that 3 ft, 11-second groundswell with clean cross-off winds – that’s the best combo of the whole run. Then on Tuesday the 15th, we get a 3 ft swell from the ESE with a 9-second period and glassy conditions. The wind is dead calm (glass), makin’ for a beautiful, clean surface. The energy is moderate (303). It’s not a big day, but it’ll be a lovely, easy paddle with clean little waves.
Honestly, for a point break, those longer-period swells (11 seconds on the 13th) are a good sign – they’ll wrap in nicely. But the crowds are listed as “sometimes,” so don’t expect to have it to yourself on the best days.
For the rest of that second week, the swell is tiny (1.0 ft to 2 ft) and the energy is pathetic. There’s just nothin’ doin’.
So, if you’re keen, aim for the morning of Sunday the 13th or the Tuesday the 15th. The 13th is the pick for a bit of grunt with the 11-second period, but the 15th will be the cleanest, glassiest session. The rest is a write-off.
Rusty.
Short Range ForecastHeavy rain (total 115mm), heaviest during Sun afternoon. Warm (max 29°C on Mon afternoon, min 22°C on Sun afternoon). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 78mm), heaviest during Tue night. Warm (max 29°C on Tue afternoon, min 22°C on Thu afternoon). Wind will be generally light. | |||||||||||||||||||
Sat 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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 | ESE 8 | ESE 9 | ESE 10 | SE 11 | SE 10 | SE 10 | SE 9 | SE 9 | S 10 | SE 8 | SSE 9 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | ESE 9 | ESE 7 | SSE 7 |
Wave Graph | ||||||||||||||||||||
106 | 186 | 820 | 1111 | 716 | 793 | 694 | 351 | 266 | 158 | 176 | 601 | 466 | 256 | 206 | 180 | 210 | 248 | 400 | 99 | |
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-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | on | cross-on | glassy |
High Tide | 11:00PM1.46m | 3:35PM1.46m | 1:17AM1.44m | 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 | ||||||||
Low Tide | 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 | 11:20AM0.16m | 11:38PM0.57m | 11:55AM0.21m | 00:11AM0.43m | |||||||
— | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | |
6:23 | — | — | 6:22 | — | — | 6:21 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | |
mm | — | 9 | 12 | 47 | 46 | 1 | — | — | — | — | 58 | 2 | 3 | 1 | 1 | 2 | 7 | 4 | 2 | 1 |
Temp °C | 27 | 25 | 24 | 22 | 23 | 27 | 29 | 25 | 29 | 29 | 26 | 25 | 24 | 24 | 24 | 23 | 24 | 27 | 27 | 26 |
Feels °C | 29 | 27 | 26 | 23 | 22 | 28 | 30 | 27 | 30 | 31 | 29 | 27 | 24 | 23 | 22 | 23 | 29 | 32 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | ESE 8 | ESE 9 | ESE 10 | SE 11 | SE 10 | SE 10 | SE 9 | SE 9 | SE 8 | SE 8 | SSE 9 | SSE 8 | SE 8 | SE 8 | SE 8 | SE 8 | ESE 9 | S 9 | SSE 7 |
106 | 186 | 820 | 1111 | 716 | 793 | 694 | 351 | 266 | 156 | 176 | 601 | 466 | 256 | 206 | 180 | 210 | 248 | 7 | 99 | |
Swell 2 Height (m) Direction Period (s) | ESE 7 | SSW 8 | SSW 9 | SSE 10 | E 10 | E 9 | E 9 | S 10 | S 10 | S 10 | S 9 | E 18 | E 18 | E 16 | E 16 | E 15 | E 15 | SSE 8 | E 14 | E 8 |
59 | 41 | 8 | 33 | 469 | 127 | 44 | 100 | 131 | 158 | 142 | 6 | 6 | 5 | 5 | 4 | 17 | 107 | 15 | 35 | |
Swell 3 Height (m) Direction Period (s) | — | — | S 8 | SSW 9 | SW 9 | SW 10 | SW 9 | SSW 11 | SW 10 | ESE 10 | ESE 10 | — | — | — | — | E 18 | E 15 | E 15 | S 9 | SE 10 |
— | — | 1 | 8 | 12 | 4 | 21 | 12 | 24 | 58 | 68 | — | — | — | — | 6 | 38 | 17 | 7 | 15 | |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 3 | NNE 4 | NNE 4 | NNE 5 | NNE 5 | NNE 5 | NNE 5 | NNE 4 | NE 4 | NE 3 | NNE 4 | NNE 4 | NNE 5 | NNE 6 | NNE 5 | NNE 4 | — | ESE 7 | E 5 |
4 | 2 | 5 | 28 | 120 | 64 | 21 | 33 | 24 | 9 | 2 | 16 | 34 | 80 | 143 | 54 | 16 | — | 400 | 21 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 43 | 43 | 43 | 22 | 64 | 0 | 43 | 1 | 0 | 22 | 43 | 43 | 43 | 43 | 0 | 6 | 11 | 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.










