Surf Forecasts:
Ikumi Beach surf forecast from 14 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 6AM (local time) - 3.5ft (1.0m), 9s period, E swell with glassy winds.
- Most powerful swell: Sunday 16 Aug, 12PM (local time) - 5.5ft (1.7m), 6s period, ESE swell with 200 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 12AM (local time) - 2ft (0.6m), 8s period with S swell.
Best Forecast Surf Conditions for Ikumi Beach this week:
The surf forecast for Ikumi Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 15) at 12AM. The primary swell is predicted to be 0.6m and 8s period with a secondary swell of 0.4m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Ikumi Beach in the next 16 days are 1.7m 6s and forecast to arrive on Sunday (Aug 16) at 12PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sat 15th Aug) | 2ft (0.6m) 8s |
| Best Surf | 6AM (Tue 18th Aug) | 3.5ft (1.0m) 9s |
| Most Powerful | 12PM (Sun 16th Aug) | 5.5ft (1.7m) 6s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s coming to Ikumi Beach over the next couple of weeks. It’s a waiting game, plain and simple.
Kicking things off, the water feels about normal for August, at 83°F. The first few days, from Friday afternoon through Monday, are a write-off. We’re talking tiny, weak swells with for onshore wind. Wave heights are stuck around 2 to 3 ft, and the energy is just pathetic.
The first chance to get wet is on Tuesday morning, the 18th of August. The wind goes glassy, dead calm. We’ve got a 3 ft swell from the east with an 8-second period. The combined energy hits a moderate 271 – nothing huge, but enough for a fun little session on a foamie or a longboard. It’ll be clean, but it’s an inconsistent spot, so don’t expect a party.
There are a few other days with small, glassy starts, like the 21st and 22nd, but the swell is tiny and the energy is weak. Just average.
Now, if you’ve got patience, the real gold comes on Monday the 24th of August. The morning is glassy with a 2 ft swell from the southeast, but here’s the kicker: the period is a very long 16 seconds. That’s proper groundswell energy, with a combined reading of 387. It’ll have long, straight lines, so it might be a bit tricky on a beach break, but it’s worth a paddle out.
The absolute standout is Tuesday, the 25th of August. Forget Monday, Tuesday morning is the one. The wind is dead calm, glassy, and the swell is a solid 5 ft from the east-southeast with a 14-second period. The combined energy is 841 – that’s strong, powerful surf. That’s head-high, clean, and packing a punch. It’s not for beginners, but if you’re comfortable, you’ll be in for a treat. Expect a few people out, because crowds are common here.
The days after that still have size, but the wind turns a bit ugly on Wednesday the 26th, making it less appealing. Thursday the 27th morning cleans up again, but the swell drops off.
So, to sum it up: a long dry spell, then a decent Tuesday (18th). The true star of the show is Tuesday, the 25th of August. That’s the one you want. Keep an eye on it as we get closer.
Rusty.
Short Range ForecastHeavy rain (total 45mm), heaviest during Sat night. Warm (max 28°C on Fri afternoon, min 24°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Mon afternoon. Warm (max 30°C on Wed morning, min 24°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||
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) | S 9 | S 8 | S 10 | S 9 | S 9 | ESE 6 | ESE 6 | SE 6 | SE 6 | ESE 5 | SE 11 | E 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 7 | SE 10 | SE 10 | SE 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 73 | 52 | 92 | 79 | 56 | 153 | 185 | 95 | 46 | 44 | 32 | 144 | 171 | 134 | 76 | 54 | 33 | 25 | 25 | 29 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | glassy | on | cross-on | on | on | on | on | on | on | glassy | cross-on | glassy | cross-on | on | cross | cross-on | on | glassy |
High Tide | 7:13PM1.94m | 6:56AM2.01m | 7:39PM1.94m | 7:35AM1.99m | 8:04PM1.93m | 8:16AM1.92m | 8:30PM1.90m | 8:59AM1.82m | 8:58PM1.86m | 9:48AM1.68m | 9:27PM1.81m | 10:51AM1.55m | 10:01PM1.74m | |||||||
Low Tide | 1:01AM0.72m | 1:20PM0.34m | 1:34AM0.63m | 1:52PM0.45m | 2:09AM0.57m | 2:23PM0.59m | 2:46AM0.55m | 2:54PM0.76m | 3:27AM0.55m | 3:26PM0.93m | 4:16AM0.59m | 4:02PM1.10m | ||||||||
 |  |  | |  | | | |  | | |  | | | | |  | | | | |
 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 | — | — |
 | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — |
mm | 1 | — | — | — | 12 | 9 | 7 | 11 | 5 | 4 | 3 | — | — | — | — | — | — | 2 | — | — |
Temp °C | 28 | 25 | 28 | 28 | 26 | 26 | 26 | 25 | 27 | 27 | 26 | 29 | 29 | 26 | 30 | 30 | 28 | 28 | 29 | 26 |
Feels °C | 30 | 29 | 31 | 31 | 30 | 29 | 29 | 29 | 31 | 32 | 30 | 31 | 32 | 29 | 32 | 33 | 33 | 32 | 33 | 32 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 8 | S 10 | S 9 | S 9 | S 8 | S 9 | S 8 | SSW 8 | SSW 8 | SSW 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 7 | ESE 7 | SE 10 | S 9 |
| kJ | 73 | 52 | 92 | 79 | 56 | 51 | 39 | 35 | 22 | 21 | 20 | 78 | 75 | 134 | 76 | 54 | 33 | 18 | 25 | 24 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | S 11 | E 10 | E 10 | ESE 9 | ESE 10 | ESE 10 | ESE 10 | SE 11 | SE 11 | ESE 9 | SSW 8 | SE 10 | SSW 8 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 6 | SE 11 |
| kJ | 17 | 37 | 30 | 30 | 25 | 34 | 35 | 31 | 42 | 30 | 28 | 19 | 27 | 12 | 12 | 16 | 25 | 25 | 10 | 29 |
Swell 3 Height (m) Direction Period (s) | SE 11 | E 9 | SE 11 | SE 8 | SE 12 | SE 12 | SE 11 | SE 11 | ESE 9 | ESE 9 | SE 11 | SE 11 | SSW 8 | SE 10 | ESE 10 | SSW 8 | SSW 8 | S 9 | S 8 | SE 6 |
| kJ | 19 | 27 | 18 | 10 | 22 | 48 | 45 | 43 | 28 | 16 | 30 | 30 | 11 | 17 | 11 | 12 | 6 | 14 | 12 | 10 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | ESE 5 | ESE 6 | ESE 6 | SE 6 | SE 6 | ESE 5 | ESE 5 | E 8 | ESE 8 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 32 | 153 | 185 | 95 | 46 | 44 | 32 | 144 | 171 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 4 | 0 | 0 | 33 | 30 | 30 | 272 | 30 | 30 | 30 | 30 | 0 | 4 | 0 | 8 | 30 | 8 | 30 | 371 | 0 |
Best forecast wave conditions in Shikoku | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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Information about the Ikumi Beach Surf forecast
The above surf forecast table for Ikumi Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ikumi Beach can be found by selecting the local surf guide option on the grey menu. Our Ikumi Beach 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 (Ikumi Beach) 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 Ikumi Beach 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.
Ikumi Beach is 30 km (19 miles) from Muroto. If you plan a holiday in Shikoku, look for hotels and other accommodation in Muroto. Muroto has rooms for a wide range of budgets as well as car hire and transport links.
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