Surf Forecasts:
Ikumi Beach surf forecast from 29 Aug 2026:
- Best quality surf: Friday 4 Sep, 9PM (local time) - 10ft (3.0m), 8s period, ESE swell with glassy winds.
- Most powerful swell: Saturday 5 Sep, 3PM (local time) - 11ft (3.5m), 9s period, ESE swell with 1,761 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 6PM (local time) - 2ft (0.6m), 7s 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 29) at 6PM. The primary swell is predicted to be 0.6m and 7s period with a secondary swell of 0.2m and 10s. 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 3.5m 9s and forecast to arrive on Saturday (Sep 05) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Saturday (Aug 29) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Sat 29th Aug) | 2ft (0.6m) 7s |
| Best Surf | 9PM (Fri 4th Sep) | 10ft (3.0m) 8s |
| Most Powerful | 3PM (Sat 5th Sep) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright mate, let’s talk about Ikumi Beach in feet and miles per hour.
Water temp is sittin’ at about 85°, which is a touch warmer than usual for this time of year—nice for a long sesh without a wetsuit.
Honestly, the first few days are pretty flat and forgettable. Saturday the 29th has a weak 3ft swell from the SSW with a short 7-second period, cross-off wind at 9 mph. Surfable but nothing to get excited about. Sunday the 30th cleans up a bit—glassy morning with a 3ft SSW swell, 8-second period, light breeze. Still small though.
Monday and Tuesday stay ankle-to-knee high with cross-shore and onshore winds. Not much doin’.
Wednesday the 2nd of September picks up a little—4ft from the SSE, 9-second period, glassy onshore wind in the morning. Wave energy moderate (353). Still just okay.
Thursday the 3rd of September is your play. We’ve got a solid 8ft SSE groundswell in the afternoon, 11-second period, and dead glassy conditions. Wave energy is strong (1466). That’s legit size—only for experienced surfers. The face will be clean as a whistle. That’s the standout.
Friday the 4th drops to 4ft–5ft from the S to SSE, periods 9-10 seconds, glassy again in the afternoon. Fun but not as heavy.
Saturday the 5th of September pumps up to 10ft–12ft from the ESE with a 9-second period. Too big for Ikumi Beach, with strong wave energy (1585–1871). Light wind early turns cross-onshore. This is more of a kite-surfing day than a paddle day. Watch from the beach.
Sunday the 6th stays huge at 10ft with moderate cross-onshore winds and rain—choppy mess. Skip it.
Monday the 7th through Wednesday the 9th holds 7ft–10ft ESE swell, but winds are mixed. The best is Tuesday the 8th morning—7ft ESE, glassy, moderate energy (685). Clean and manageable for intermediate-to-advanced.
From Thursday the 10th onward, it fades to 2ft–6ft with mostly glassy mornings and short-to-medium periods. The 12th of September afternoon has a 3ft SSW swell with 11-second period and zero wind—dead flat and clean, but tiny. Perfect for a longboard.
The clear standout is Thursday afternoon, 3rd of September—that 8ft SSE groundswell with glassy conditions is your best wave of the outlook. Tuesday the 8th morning is another solid runner-up. The rest is either weak or too big for this spot.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Sun afternoon. Warm (max 32°C on Sat morning, min 24°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 69mm), heaviest during Wed night. Warm (max 29°C on Tue afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | |||||||||||||||
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) | SSW 7 | ESE 9 | SSW 8 | SSW 8 | S 7 | S 7 | S 8 | S 8 | S 8 | S 9 | S 8 | SSE 8 | SSE 9 | SSE 8 | ESE 6 | SSE 12 | SSE 11 | S 10 | S 10 | S 9 | ESE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 97 | 8 | 138 | 117 | 54 | 51 | 71 | 51 | 49 | 95 | 144 | 256 | 237 | 211 | 97 | 1496 | 1336 | 666 | 354 | 246 | 1331 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | glassy | cross-off | cross-off | cross | cross | glassy | glassy | on | glassy | on | on | glassy | cross-on | glassy | glassy | cross-on | glassy | glassy |
High Tide | 7:05PM1.95m | 7:10AM2.03m | 7:30PM1.95m | 7:49AM1.98m | 7:55PM1.93m | 8:29AM1.89m | 8:20PM1.90m | 9:13AM1.77m | 8:48PM1.85m | 10:06AM1.62m | 9:18PM1.78m | 11:21AM1.49m | 9:56PM1.69m | ||||||||
Low Tide | 12:52PM0.37m | 1:04AM0.56m | 1:23PM0.47m | 1:36AM0.48m | 1:53PM0.59m | 2:11AM0.45m | 2:23PM0.74m | 2:49AM0.46m | 2:53PM0.90m | 3:32AM0.50m | 3:25PM1.07m | 4:25AM0.57m | 4:05PM1.22m | ||||||||
 |  |  | | |  |  | |  |  | | | | | | |  |  |  | |  | |
 | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — |
 | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:25 | — | — | 6:24 | — |
mm | — | 1 | — | — | 3 | 2 | — | — | — | 1 | — | 6 | 5 | 5 | 27 | 14 | 7 | 4 | 5 | 4 | 6 |
Temp °C | 32 | 31 | 27 | 30 | 30 | 27 | 30 | 30 | 26 | 28 | 29 | 26 | 27 | 27 | 26 | 25 | 25 | 25 | 27 | 26 | 25 |
Feels °C | 34 | 34 | 32 | 34 | 35 | 32 | 33 | 33 | 31 | 33 | 32 | 32 | 32 | 32 | 31 | 29 | 30 | 29 | 32 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | SE 9 | ESE 9 | SSW 7 | S 7 | S 7 | S 7 | S 8 | S 8 | S 8 | S 9 | S 8 | SSE 8 | SSE 9 | SSE 8 | SE 7 | SSE 13 | SSE 11 | S 10 | S 10 | S 9 | S 10 |
| kJ | 13 | 8 | 73 | 54 | 54 | 51 | 71 | 51 | 49 | 95 | 144 | 176 | 237 | 211 | 54 | 1152 | 1336 | 666 | 354 | 246 | 198 |
Swell 2 Height (m) Direction Period (s) | SSE 13 | SSE 9 | SE 11 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ESE 13 | E 12 | E 12 | E 11 | E 11 | S 9 | SSW 11 | SSW 12 | ESE 8 | ESE 9 | ESE 8 | SW 11 |
| kJ | 17 | 8 | 19 | 27 | 36 | 38 | 25 | 25 | 23 | 59 | 80 | 71 | 61 | 57 | 74 | 47 | 98 | 322 | 264 | 179 | 30 |
Swell 3 Height (m) Direction Period (s) | E 10 | SE 13 | ESE 9 | ESE 10 | SW 11 | SW 9 | E 6 | SSW 10 | SW 9 | SE 9 | SE 9 | SE 10 | SE 11 | SE 11 | SSE 7 | ESE 10 | E 10 | SE 13 | SSW 11 | SSW 11 | — |
| kJ | 8 | 7 | 8 | 9 | 4 | 3 | 1 | 10 | 21 | 23 | 22 | 15 | 18 | 18 | 26 | 32 | 32 | 7 | 49 | 47 | — |
Wind waves Height (m) Direction Period (s) | SSW 7 | SSW 5 | SSW 8 | SSW 8 | — | SW 3 | SSW 7 | SSW 3 | — | — | — | SSE 8 | ESE 5 | ESE 5 | ESE 6 | SSE 12 | — | — | NE 3 | NE 4 | ESE 8 |
| kJ | 97 | 61 | 138 | 117 | — | 7 | 49 | 1 | — | — | — | 256 | 37 | 69 | 97 | 1496 | — | — | 5 | 8 | 1331 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 16 | 0 | 0 | 0 | 0 | 4 | 4 | 0 | 0 | 33 | 0 | 30 | 30 | 0 | 30 | 0 | 0 | 30 | 0 | 4 |
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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