
Surf Forecasts:
Ikumi Beach surf forecast from 10 Sep 2026:
- Best quality surf: Sunday 13 Sep, 6PM (local time) - 4ft (1.2m), 8s period, SE swell with glassy winds.
- Most powerful swell: Tuesday 15 Sep, 6AM (local time) - 4.5ft (1.3m), 9s period, SE swell with 272 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 cross-offshore as the swell arrives.
The most powerful waves expected at Ikumi Beach in the next 16 days are 1.3m 9s and forecast to arrive on Tuesday (Sep 15) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Thursday (Sep 10) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 11th Sep) | 3.5ft (1.0m) 8s |
| Best Surf | 6PM (Sun 13th Sep) | 4ft (1.2m) 8s |
| Most Powerful | 6AM (Tue 15th Sep) | 4.5ft (1.3m) 9s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about what's coming up for Ikumi Beach. This stretch is an inconsistent, exposed beginner spot, and it's a slow start with a long wait. For the first several days, we are looking at a real struggle. The water temp is sitting at 83°F which is about normal for this time of year.
We kick off on Thursday, September 10th with nothing to write home about. Tiny, weak SSE swell of 3ft and a short period of 8 seconds, combined with a messy cross-shore wind. Total energy is weak at 196. It's a write-off.
Friday the 11th brings a glimmer. The morning shows a glassy 3ft SSE swell, but still a short 8 second period and very ordinary conditions. It's a 1 out of 10 situation. The afternoon turns to junk with a cross-onshore breeze.
Saturday and Sunday are more of the same struggle. Small swell, poor winds, and the energy stays weak, dipping as low as 52 on Sunday morning. Not worth the paddle.
Monday, September 14th, things start to turn. The morning is glassy with a 4ft SE swell at 9 seconds, and it feels a little better. The afternoon looks even better - flat calm, glassy, and the energy is picking up to 202. This is the first real chance for a clean session, even if the waves are small.
Tuesday the 15th is the standout of this whole first week. The morning delivers 4ft SE swell at 9 seconds with glassy conditions, and the energy jumps to 260. The afternoon holds similar quality with 4ft and glassy conditions. This is as good as it gets for the first half of the forecast. Clean lines and no wind. Keep your expectations realistic for size though.
Wednesday and Thursday see a drop back to ordinary conditions. The wind and swell just don't cooperate. The energy drops below 200 again.
Now, looking into the second week, this is where it gets wild but not for us. Friday, September 18th, we start seeing a massive jump in period to 16 seconds, meaning a proper groundswell. The swell size climbs to 5ft and then 7ft, with combined energy skyrocketing to 1451 and then 3142. But the wind is onshore or cross-onshore, and the wave comment warns of marginal or questionable conditions. It's too much for a beginner spot.
From Saturday the 19th all the way through Tuesday the 22nd, the swell goes ballistic, hitting 30ft on Tuesday morning with an insane energy reading of 34458. The comments say it all: the swell is predicted to be too big for this break. This is expert-only territory, and honestly, even for experts, the wind and tide aren't aligning. For the average surfer, this is a stay-on-the-beach day.
By Wednesday the 23rd, the swell crashes hard and the wind switches to a near gale from the SW at 37 mph. The ocean will be a clean but angry mess, probably more interesting for kite surfers than paddle surfers.
The last few days, September 24th and 25th, fizzle out with tiny, weak swell and poor wind again.
So, the bottom line: The best you'll get is Tuesday, September 15th. Glassy conditions, a clean 4ft SE swell. It's not big, but it's the most rideable and pleasant session in this 16-day run. Everything else is either too small and weak, or too big and messy.
Rusty.
Short Range ForecastHeavy rain (total 23mm), heaviest during Thu afternoon. Warm (max 26°C on Sat afternoon, min 22°C on Thu afternoon). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 41mm), heaviest during Mon night. Warm (max 28°C on Sun morning, min 21°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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) | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | S 7 | S 7 | S 7 | SSE 7 | ESE 9 | SE 9 | SE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 |
Wave Graph | |||||||||||||||||||||
136 | 123 | 117 | 117 | 140 | 124 | 59 | 34 | 53 | 31 | 112 | 143 | 182 | 186 | 242 | 242 | 186 | 135 | 135 | 121 | 99 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | glassy | cross-on | cross | cross | cross-on | glassy | glassy | on | glassy | glassy | glassy | glassy | glassy | glassy | glassy | cross | cross-off | cross-off |
High Tide | 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 | 8:43AM1.83m | 8:12PM1.88m | ||||||||
Low Tide | 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 | 2:23PM0.88m | 2:54AM0.40m | |||||||
5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — | 5:46 | — | — | |
— | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:12 | — | — | 6:09 | — | — | 6:08 | — | |
mm | 1 | 4 | 5 | 2 | 3 | — | 2 | 2 | 4 | 2 | — | 2 | 2 | 5 | 10 | 4 | 10 | 6 | 4 | 6 | 9 |
Temp °C | 24 | 22 | 24 | 25 | 25 | 24 | 25 | 26 | 25 | 28 | 28 | 26 | 27 | 26 | 22 | 23 | 23 | 23 | 24 | 23 | 24 |
Feels °C | 24 | 24 | 29 | 30 | 30 | 27 | 29 | 30 | 30 | 32 | 32 | 31 | 32 | 31 | 25 | 26 | 27 | 27 | 28 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | S 7 | S 7 | S 7 | SSE 7 | ESE 9 | SE 9 | SE 8 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 |
136 | 123 | 117 | 117 | 140 | 124 | 59 | 34 | 26 | 31 | 112 | 143 | 182 | 186 | 242 | 242 | 186 | 135 | 135 | 121 | 99 | |
Swell 2 Height (m) Direction Period (s) | E 16 | E 15 | ESE 11 | E 15 | ESE 10 | ESE 10 | SE 10 | SE 10 | ESE 10 | SE 4 | E 13 | E 13 | E 13 | E 12 | E 12 | S 7 | E 13 | E 13 | E 14 | S 6 | E 13 |
5 | 4 | 12 | 17 | 20 | 19 | 24 | 25 | 35 | 7 | 31 | 13 | 13 | 12 | 12 | 1 | 14 | 13 | 4 | 1 | 3 | |
Swell 3 Height (m) Direction Period (s) | S 8 | E 18 | E 15 | SE 11 | E 14 | E 14 | E 13 | E 14 | E 14 | S 7 | S 7 | S 7 | S 7 | S 7 | S 7 | E 15 | S 7 | S 7 | E 12 | E 13 | S 6 |
5 | 6 | 17 | 5 | 15 | 36 | 31 | 32 | 35 | 14 | 3 | 4 | 4 | 4 | 1 | 17 | 1 | 1 | 3 | 4 | 1 | |
Wind waves Height (m) Direction Period (s) | NNE 5 | NE 4 | NNE 2 | — | NE 3 | NNE 3 | NE 4 | NE 3 | SSE 7 | — | SE 5 | — | — | — | — | — | NE 2 | NNE 3 | NNE 2 | — | NNE 3 |
50 | 7 | 1 | — | 3 | 8 | 4 | 2 | 53 | — | 25 | — | — | — | — | — | 2 | 1 | 1 | — | 1 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 8 | 0 | 0 | 8 | 8 | 8 | 8 | 0 | 0 | 371 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 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.










