Surf Forecasts:
Ikumi Beach surf forecast from 8 Aug 2026:
- Best quality surf: Sunday 9 Aug, 6AM (local time) - 5ft (1.5m), 12s period, SSW swell with cross-offshore winds.
- Most powerful swell: Sunday 9 Aug, 6AM (local time) - 5ft (1.5m), 12s period, SSW swell with 593 kJ wave energy.
- Next surfable swell (1★+): Saturday 8 Aug, 6PM (local time) - 5ft (1.6m), 11s period with SSW 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 08) at 6PM. The primary swell is predicted to be 1.6m and 11s period with a secondary swell of 1.5m and 9s. 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 1.5m 12s and forecast to arrive on Sunday (Aug 09) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 11s period and expected on Tuesday (Aug 11) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Sat 8th Aug) | 5ft (1.6m) 11s |
| Best Surf | 6AM (Sun 9th Aug) | 5ft (1.5m) 12s |
| Most Powerful | 6AM (Sun 9th Aug) | 5ft (1.5m) 12s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright, Rusty here, switching to feet and degrees for you. Let’s talk Ikumi Beach.
The water’s sitting at 84°F, which is a touch warmer than usual for this time of year. Nice for staying in the water a long time.
First week is a bit of a fight. Saturday the 8th, we’ve got a 6ft south swell, 11-second period, and the combined energy is 1392 – that’s a lot of power. But there’s a risk of thunderstorms and an onshore wind, so it’s gonna be messy. Not the day for clean waves. The afternoon cleans up a little, but still marginal.
Sunday the 9th, the swell drops to 4ft from the SSW, but the wind is cross-on, bumping up the surface. Energy is still solid at 887.
Now, Monday the 10th is the real keeper. 4ft south swell, 10-second period, and the wind goes glassy. Energy is moderate at 489, but those waves will be clean and lined up. Best morning of the first week. The afternoon holds the same glassy conditions with a 3ft south swell.
Tuesday the 11th morning is another glassy morning with 4ft south swell, energy at 297. Afternoon turns cross-on, so morning is the call.
Wednesday through Friday the 14th is a slow fade. Swell drops to 2ft, wind is mostly cross-on or onshore. Energy dips into the low 100s. Poor conditions. Wait it out.
Then we get a late window. Saturday the 15th afternoon – 4ft from the ESE, 9-second period, but the wind is glassy. Energy jumps to 550, and the forecast says “very good surf conditions.” This is the best call of the whole outlook. Sunday the 16th keeps that quality with 4ft to 4ft from the ESE, period stretching to 12 seconds, glassy again. That weekend has real potential, but it’s a week and a half away.
After that, the swell fades hard. Monday the 17th drops to 2ft, and by Wednesday the 19th, we’re scraping 2ft with energy in the 60s. Not worth it. There’s a bump of 4ft on Thursday the 20th afternoon, but it’s a short 7-second wind swell, energy only 213, with onshore wind. Pass.
So the standouts: Monday the 10th for the glassy morning, and Saturday the 15th afternoon through Sunday the 16th for the best quality of the whole run. Crowds at Ikumi are often a factor, so expect company.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat morning. Warm (max 29°C on Sat morning, min 24°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Thu morning. Warm (max 28°C on Tue afternoon, min 23°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
AM | 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 11 | S 11 | SSW 11 | SSW 12 | SSW 12 | S 12 | S 10 | S 10 | S 11 | S 10 | SSW 10 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SE 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 792 | 629 | 447 | 436 | 390 | 286 | 296 | 192 | 275 | 250 | 276 | 140 | 249 | 236 | 180 | 131 | 123 | 113 | 86 | 86 | 73 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | glassy | cross-on | on | glassy | glassy | glassy | glassy | glassy | cross-on | cross-off | cross-on | on | glassy | cross-on | glassy | cross-off | cross-on | cross-on | cross-off |
High Tide | 3:40PM1.52m | 1:21AM1.61m | 4:41PM1.64m | 2:48AM1.66m | 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 | ||||||||
Low Tide | 8:11PM1.35m | 9:08AM0.51m | 9:44PM1.29m | 10:08AM0.40m | 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 | ||||||||
 |  |  | | |  | |  | | | |  | | | | | |  | | | | |
 | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — |
 | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — |
mm | 1 | — | — | 1 | — | 1 | — | — | — | — | — | — | — | — | — | 6 | 3 | 2 | 1 | 4 | 1 |
Temp °C | 29 | 29 | 26 | 28 | 29 | 26 | 28 | 28 | 26 | 27 | 28 | 25 | 28 | 28 | 25 | 25 | 26 | 25 | 27 | 26 | 25 |
Feels °C | 31 | 32 | 31 | 32 | 33 | 31 | 32 | 32 | 30 | 31 | 31 | 28 | 29 | 31 | 29 | 28 | 30 | 29 | 30 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SE 9 | S 11 | SSW 11 | SSW 12 | SSW 12 | S 12 | S 10 | S 10 | S 11 | S 10 | SSW 10 | S 10 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 |
| kJ | 515 | 629 | 447 | 436 | 390 | 274 | 296 | 192 | 275 | 250 | 276 | 127 | 249 | 236 | 180 | 131 | 123 | 113 | 86 | 86 | 64 |
Swell 2 Height (m) Direction Period (s) | S 11 | SE 8 | SE 8 | ESE 13 | SSE 10 | SSW 11 | E 12 | E 12 | E 12 | E 11 | E 11 | SSW 11 | SE 13 | E 10 | SE 12 | SE 12 | SE 12 | ESE 5 | ESE 5 | SE 11 | ESE 5 |
| kJ | 792 | 327 | 177 | 372 | 281 | 270 | 193 | 141 | 98 | 38 | 37 | 140 | 27 | 18 | 24 | 23 | 22 | 19 | 8 | 31 | 17 |
Swell 3 Height (m) Direction Period (s) | SSW 15 | ESE 10 | ESE 10 | SE 7 | E 13 | ESE 13 | SW 11 | SSW 12 | SE 14 | SW 11 | SE 13 | E 10 | E 10 | SE 13 | E 10 | E 10 | E 10 | SE 12 | SE 11 | E 9 | SE 11 |
| kJ | 85 | 71 | 104 | 79 | 339 | 286 | 64 | 90 | 30 | 33 | 27 | 18 | 8 | 26 | 7 | 7 | 7 | 22 | 20 | 6 | 73 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NE 4 | NE 4 | — | NE 3 | ENE 3 | ESE 5 | ESE 5 | ESE 4 | — | — | ESE 5 | — |
| kJ | — | — | — | — | — | — | — | — | — | 9 | 6 | — | 2 | 3 | 37 | 28 | 15 | — | — | 8 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 33 | 0 | 30 | 33 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 30 | 371 | 0 | 30 | 0 | 0 | 30 | 233 | 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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