Surf Forecasts:
Ikumi Beach surf forecast from 9 Sep 2026:
- Best quality surf: Sunday 13 Sep, 9PM (local time) - 4ft (1.2m), 9s period, SE swell with glassy winds.
- Most powerful swell: Wednesday 9 Sep, 3PM (local time) - 6ft (1.8m), 8s period, SSE swell with 450 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 12AM (local time) - 3.5ft (1.0m), 8s period with SSE 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 Friday (Sep 11) at 12AM. The primary swell is predicted to be 1.0m and 8s period with a secondary swell of 0.2m and 11s. Another secondary swell of 0.2m and 2s is also forecast. 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 1.8m 8s and forecast to arrive on Wednesday (Sep 09) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 7s period and expected on Wednesday (Sep 16) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 11th Sep) | 3.5ft (1.0m) 8s |
| Best Surf | 9PM (Sun 13th Sep) | 4ft (1.2m) 9s |
| Most Powerful | 3PM (Wed 9th Sep) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Gotta be straight with you—this is a weird one for Ikumi Beach. We’ve got a long stretch of nothing much, then a massive pulse of energy that’s going to be way too much for this spot.
The water’s sitting at a warm 83°, which is a touch warmer than normal for this time of year.
Right now, we’re looking at Wednesday the 9th with a solid 10ft swell from the south, but it’s got 1581 (moderate wave energy) behind it and that’s flat-out too big for Ikumi. The wind is a cross-off and the conditions are clean, but it’s too heavy for the average surfer here. Then the next week and a half is a total write-off – tiny waves, poor conditions, and most days scoring zero. There’s a glimmer of hope on the 15th (Tuesday morning) with 4ft from the ESE and glassy conditions, but honestly, it’s just ordinary surf.
The real standout is a long way off. Mark your calendars for Friday the 18th. The afternoon session is where it’s at: 4ft from the southeast with a long period of 16 seconds. That’s groundswell, and with glassy conditions and 761 (moderate wave energy), the shape should be good. But remember, a long period like that can make it break a bit straight here at the beach, so pick your peak. The morning of the 18th is also worth a paddle with 2ft but a very long 18-second period, giving you 342 (moderate wave energy). It’s promising, but still a week and a half out, so don’t lock it in.
Saturday the 19th sees a huge jump: 8ft on the morning, then 7ft in the afternoon, both from the SSE with periods over 16 seconds. The energy is huge (4441 and 4065), but the wind is slight cross-on. That’s expert territory only. The same goes for the 20th and 21st – we’re looking at 10ft to 15ft swells with energy readings in the thousands and tens of thousands. Way too big for Ikumi, and the wind gets messy. By the 22nd and 23rd, we’re talking gale-force winds and a mind-blowing 26ft swell. That’s not paddle surfing; that’s survival.
After all that chaos, Thursday the 24th morning finally gives us a clean 4ft from the south with a 10-second period, light winds, and 311 (moderate wave energy). It’s surfable and clean, but nothing special.
So, bottom line: the best bet is the afternoon of Friday the 18th. It’s the cleanest, most promising window in a very weird 16-day forecast. The rest is either flat, blown out, or way too big for this beach.
Stay tuned, forecasts can change.
Rusty.
Short Range ForecastHeavy rain (total 23mm), heaviest during Wed morning. Warm (max 27°C on Wed morning, min 21°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 79mm), heaviest during Mon night. Warm (max 28°C on Sun afternoon, min 24°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||
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 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SE 10 | ESE 10 | E 13 | ESE 9 | ESE 9 | SE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | SE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1575 | 450 | 202 | 136 | 123 | 120 | 101 | 138 | 94 | 51 | 25 | 35 | 31 | 55 | 211 | 174 | 203 | 221 | 207 | 161 | 155 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross | cross | cross-on | glassy | glassy | cross-on | cross | cross-on | glassy | glassy | cross-on | on | glassy | glassy | cross-on | on | glassy | cross-off | glassy |
High Tide | 5:17PM1.81m | 4:44AM1.86m | 5:43PM1.87m | 5:27AM1.96m | 6:07PM1.91m | 6:07AM2.02m | 6:32PM1.94m | 6:45AM2.04m | 6:56PM1.95m | 7:23AM2.02m | 7:21PM1.95m | 8:01AM1.94m | 7:45PM1.92m | ||||||||
Low Tide | 10:37AM0.43m | 11:00PM0.91m | 11:16AM0.39m | 11:31PM0.75m | 11:51AM0.38m | 00:02AM0.61m | 12:23PM0.42m | 00:34AM0.49m | 12:54PM0.50m | 1:06AM0.40m | 1:24PM0.61m | 1:39AM0.36m | 1:53PM0.74m | 2:15AM0.36m | |||||||
 |  |  |  |  |  |  | | | | |  | | | | | |  |  | |  | |
 | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — |
 | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:12 | — | — | 6:09 | — |
mm | 18 | — | — | — | 2 | 1 | 1 | 1 | — | 3 | 6 | 8 | 2 | — | 2 | 2 | 4 | 52 | 15 | 23 | 1 |
Temp °C | 27 | 25 | 22 | 25 | 24 | 23 | 26 | 26 | 25 | 26 | 25 | 25 | 27 | 28 | 25 | 27 | 27 | 25 | 24 | 24 | 24 |
Feels °C | 30 | 27 | 21 | 26 | 26 | 26 | 30 | 30 | 29 | 30 | 30 | 30 | 31 | 32 | 30 | 32 | 31 | 29 | 29 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | E 18 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | S 7 | S 7 | ESE 9 | ESE 9 | ESE 9 | SE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | SE 9 |
| kJ | 6 | 450 | 202 | 136 | 123 | 120 | 101 | 138 | 94 | 51 | 23 | 23 | 31 | 55 | 211 | 174 | 203 | 221 | 207 | 161 | 155 |
Swell 2 Height (m) Direction Period (s) | — | E 18 | E 16 | E 16 | E 15 | ESE 11 | E 15 | E 14 | ESE 10 | SE 10 | SE 10 | ESE 10 | S 7 | S 7 | S 7 | E 13 | E 12 | S 7 | E 12 | SSW 8 | E 13 |
| kJ | — | 6 | 5 | 5 | 4 | 12 | 17 | 15 | 19 | 24 | 25 | 35 | 15 | 8 | 8 | 13 | 12 | 4 | 11 | 6 | 13 |
Swell 3 Height (m) Direction Period (s) | — | — | E 16 | — | E 18 | E 15 | SE 11 | E 14 | E 14 | E 13 | ESE 6 | SE 4 | E 13 | E 13 | E 13 | S 7 | S 7 | E 15 | S 8 | E 13 | SW 7 |
| kJ | — | — | 21 | — | 6 | 17 | 5 | 60 | 36 | 31 | 6 | 5 | 31 | 31 | 13 | 4 | 4 | 18 | 1 | 14 | 2 |
Wind waves Height (m) Direction Period (s) | S 9 | NNE 4 | NNE 5 | NNE 5 | NE 4 | NNE 2 | NE 3 | NE 3 | — | NE 3 | — | E 4 | ESE 4 | SE 5 | — | — | — | — | — | — | — |
| kJ | 1575 | 14 | 66 | 56 | 11 | 1 | 2 | 3 | — | 2 | — | 9 | 6 | 24 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 30 | 30 | 30 | 8 | 0 | 0 | 36 | 8 | 8 | 0 | 0 | 30 | 531 | 0 | 0 | 4 | 30 | 0 | 0 | 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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