
Surf Forecasts:
Ikumi Beach surf forecast from 10 Aug 2026:
- Best quality surf: Monday 10 Aug, 9PM (local time) - 3.5ft (1.0m), 10s period, S swell with cross-offshore winds.
- Most powerful swell: Tuesday 11 Aug, 3AM (local time) - 3.5ft (1.0m), 11s period, S swell with 238 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 9PM (local time) - 3.5ft (1.0m), 10s 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 Monday (Aug 10) at 9PM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.6m and 12s. Another secondary swell of 0.4m and 4s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Ikumi Beach in the next 16 days are 1.0m 11s and forecast to arrive on Tuesday (Aug 11) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Tuesday (Aug 11) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 10th Aug) | 3.5ft (1.0m) 10s |
| Best Surf | 9PM (Mon 10th Aug) | 3.5ft (1.0m) 10s |
| Most Powerful | 3AM (Tue 11th Aug) | 3.5ft (1.0m) 11s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright, this is Rusty. Let's be straight with you: the outlook for Ikumi Beach over the next 16 days is pretty flat. We're looking at a long stretch of small, weak surf with only a few decent windows. Most of the time the swell is just too small to get excited about, and the conditions are often compromised by onshore or cross-shore breezes. The water's sitting at a warm 84°, which is about normal for this time of year, so at least you won't need a thick wetsuit.
The first real chance of anything rideable doesn't show up until Monday, August 12th, in the morning. The swell is a tiny 2ft from the SSW with a 10-second period, but the wind is completely glassy – dead calm. That's a major positive, making it clean as a whistle. The combined energy is only 197 (weak), so it's for the longboard or a big foamie, and you'll have to hunt for the little peaks. Expect crowds, as this spot is often busy, and it's inconsistent, so patience is key.
The pattern repeats itself over the next few days. Early mornings on Friday, August 16th, and Saturday, August 17th offer the same deal: 2ft of SSW swell with glassy conditions. The energy is still low (113 and 160 respectively), but the clean surface means you can still have a fun little session on the mal. The afternoons are generally a write-off with onshore or cross-shore winds.
Looking further out, we get a slight pulse around Tuesday, August 20th. The swell picks up to 3ft from the SSE, but the period drops to 8 seconds – that's short-period, windswell, and it won't have much shape. The morning is glassy, which is positive, but it's still a very ordinary wave. The energy is a bit higher at 123, but still weak.
The end of the month offers a bit more hope. Tuesday, August 27th, and Wednesday, August 28th see the swell bump back up to 3ft from the SE, with a 10-second period. The early mornings are glassy again, and the energy reads 170 and 192 – still weak overall, but the best numbers we've seen. It's still not big, but it's the best period on offer. The crowds are still a factor, and the waves are inconsistent, but if you're desperate for a wave, these are the standouts.
Honestly, for the whole 16 days, your best bet is to go at dawn, on a longboard, and manage your expectations. The glassy windows are the only saving grace. There's nothing here for a shortboarder, and the entire period is a bit of a grind. The good news is that the swell is small, so it's not intimidating for beginners, but the inconsistent nature makes it a tough call.
Rusty.
Short Range ForecastModerate rain (total 16mm), heaviest on Thu morning. Warm (max 30°C on Mon afternoon, min 22°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 10mm), heaviest on Thu afternoon. Warm (max 29°C on Sat morning, min 23°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | ||||||||||||||
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 10 | S 10 | S 10 | SSW 10 | SSW 10 | SSW 10 | S 10 | S 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 8 | S 10 | SSW 10 | S 9 | S 10 | S 9 | ESE 11 |
Wave Graph | ||||||||||||||||||||
190 | 216 | 216 | 173 | 173 | 92 | 88 | 83 | 88 | 86 | 79 | 78 | 56 | 71 | 125 | 128 | 108 | 90 | 81 | 202 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-off | cross | cross-on | cross-off | glassy | on | glassy | cross-on | on | glassy | glassy | cross-on | off | glassy | cross-on | glassy | on | cross | off |
High Tide | 5:20PM1.74m | 3:55AM1.74m | 5:52PM1.82m | 4:48AM1.84m | 6:20PM1.88m | 5:34AM1.93m | 6:47PM1.92m | 6:16AM1.99m | 7:13PM1.94m | 6:56AM2.01m | 7:39PM1.94m | 7:35AM1.99m | 8:04PM1.93m | |||||||
Low Tide | 10:39PM1.19m | 10:55AM0.31m | 11:20PM1.07m | 11:36AM0.25m | 11:55PM0.95m | 12:13PM0.24m | 00:28AM0.83m | 12:48PM0.27m | 1:01AM0.72m | 1:20PM0.34m | 1:34AM0.63m | 1:52PM0.45m | 2:09AM0.57m | |||||||
— | — | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | |
6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | |
mm | 1 | — | — | — | — | — | 1 | 7 | 7 | 4 | 3 | — | 2 | — | — | — | — | 1 | 2 | 1 |
Temp °C | 30 | 26 | 30 | 30 | 24 | 27 | 26 | 25 | 25 | 26 | 25 | 28 | 28 | 25 | 29 | 29 | 25 | 28 | 28 | 25 |
Feels °C | 34 | 30 | 31 | 31 | 27 | 29 | 28 | 29 | 28 | 30 | 29 | 31 | 31 | 29 | 31 | 32 | 29 | 32 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 10 | S 10 | SSW 10 | SSW 10 | S 9 | S 10 | S 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 8 | S 10 | SSW 10 | S 9 | S 10 | S 9 | ESE 11 |
190 | 216 | 216 | 173 | 173 | 85 | 88 | 83 | 88 | 86 | 79 | 78 | 56 | 71 | 125 | 128 | 108 | 90 | 81 | 202 | |
Swell 2 Height (m) Direction Period (s) | E 12 | E 12 | E 11 | E 11 | E 11 | SSW 10 | SSW 10 | SW 10 | ESE 4 | ESE 4 | ESE 4 | E 9 | ESE 9 | E 10 | ESE 11 | E 11 | ESE 10 | E 10 | E 10 | S 9 |
144 | 101 | 63 | 57 | 35 | 92 | 58 | 26 | 3 | 1 | 3 | 15 | 16 | 30 | 24 | 82 | 74 | 51 | 33 | 54 | |
Swell 3 Height (m) Direction Period (s) | SW 11 | SE 14 | SE 13 | SE 13 | NE 4 | E 10 | E 10 | ESE 5 | E 9 | E 9 | E 10 | SE 11 | SE 11 | SE 11 | SE 8 | SE 8 | SE 12 | SE 12 | SE 11 | SE 11 |
56 | 31 | 28 | 27 | 4 | 19 | 19 | 2 | 7 | 15 | 16 | 20 | 19 | 29 | 11 | 10 | 23 | 49 | 45 | 43 | |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 4 | NE 4 | NE 5 | N 4 | NNE 4 | — | E 5 | E 7 | — | — | — | — | — | — | — | — | — | ESE 5 | SE 4 |
3 | 14 | 14 | 49 | 11 | 1 | — | 7 | 23 | — | — | — | — | — | — | — | — | — | 30 | 21 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 14 | 0 | 8 | 8 | 0 | 0 | 33 | 0 | 30 | 30 | 0 | 0 | 4 | 0 | 0 | 4 | 0 | 33 | 4 | 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.











