Ikumi Beach Surf Break

Lat Long: 33.53° N 134.28° E

Ikumi Beach Surf Forecast and Surf Report

Issued: 8 pm 17 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ikumi Beach sea temperature is
28.4° C
0.7° 

Ikumi Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Ikumi Beach surf forecast from 17 Aug 2026:

  • Best quality surf: Tuesday 25 Aug, 12AM (local time) - 3.5ft (1.1m), 14s period, SE swell with glassy winds.
  • Most powerful swell: Tuesday 25 Aug, 3AM (local time) - 4.5ft (1.3m), 14s period, SE swell with 746 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 18 Aug, 3AM (local time) - 1.5ft (0.4m), 11s period with SE 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 Tuesday (Aug 18) at 3AM. The primary swell is predicted to be 0.4m and 11s period with a secondary swell of 0.4m and 8s. Another secondary swell of 0.7m and 5s 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 1.3m 14s and forecast to arrive on Tuesday (Aug 25) at 3AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 9s period and expected on Monday (Aug 24) at 12PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Tue 18th Aug)1.5ft (0.4m) 11s
Best Surf12AM (Tue 25th Aug)3.5ft (1.1m) 14s
Most Powerful 3AM (Tue 25th Aug)4.5ft (1.3m) 14s

Table - best surf conditions forecast for Ikumi Beach over the next 16 days.


The Lowdown

Alright, this is Rusty checkin' in from the coast. Let's have a look at what's coming down the pipe for the next couple of weeks.

Well, I gotta be straight with you, the first few days are a bit of a write-off. We're lookin' at a real flat spell from Monday the 17th right through to Thursday the 20th of August. The swell that's around is tiny, just 2 ft to 3 ft of short-period slop, and the wind's got a dirty cross-on or onshore kick to it. It's a no-go. You won't see me out there.

Things start to get a bit of a pulse on Friday the 21st. The morning glass-off is a beauty, and we get a clean 4 ft southerly swell with a decent 11-second period. The water's at 83°, which is bang on average for this time of year, so it's a warm one. The combined energy is moderate (472), and it’s the first real sign of life. Saturday the 22nd morning has a similar vibe with 3 ft of clean glassy swell, but the energy drops off (234) and the afternoon turns messy.

We get a nice run from Sunday the 23rd onwards. The wind swings clean offshore on Sunday afternoon with a 4 ft SSW swell, and then Monday the 24th morning is absolutely glassy – 5 ft of short-period SSW swell (343) but that clean face will make it fun. The only real standout in this first week is the early morning of Monday the 24th. That 5 ft on the glass, it's gonna be the best bet for a clean, user-friendly wave. It’s the only one that really ticks all the boxes for a good session.

Now, hold onto your board, because things get real interesting from the 25th of August onwards. We get a massive pulse of SE groundswell. The period jumps to 14-17 seconds, which is proper long-period energy. The combined energy numbers go through the roof – we're talking 624 on the 25th, then 1922 on the 26th, and then it just explodes.

The 26th of August Wednesday afternoon is the first real crack at something special. You've got a 8 ft swell from the SE with a 17-second period, and the wind is glassy. The energy is monstrous (3112) and the conditions are marked as excellent for experienced surfers. This is a serious, powerful groundswell. It's going to be a long-period beast, so it will be better at the points and reefs, but for Ikumi, this is as good as it gets if you're experienced. The waves will be big and they'll have some serious punch.

For the rest of the week, from the 27th of August through to the 1st of September, the swell gets even bigger. We're talkin' 10 ft to 16 ft on the face. The energy numbers are insane, hitting 11713 at one point. But the reports are clear: this swell is too big for Ikumi Beach. It's gonna be a washing machine, and for experts only if they even try it. The wind stays good, often glassy or clean, but the size makes it a no-go zone for 99% of surfers. The standout here is the 26th of August afternoon.

The very end of the period, the 31st of August and 1st of September, sees the swell drop back to a more manageable 7 ft to 8 ft with S to SSW direction and a long period. The energy is still very strong (2704-3895), and the morning glass-offs are back on the menu. It's still big, but it's a step down from the absolute madness of the 27th-30th.

So, to sum it up: this forecast is a tale of two halves. The first week is mostly flat to small, with the standout being the Monday the 24th morning glass-off. The second week delivers a massive, long-period groundswell that is too big for the beach for most of it, but you absolutely cannot miss the Wednesday the 26th afternoon glass-off. That's the one. Lock it in.

Rusty.

Short Range Forecast

Moderate rain (total 17mm), heaviest on Tue morning. Warm (max 28°C on Tue afternoon, min 25°C on Mon night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 30°C on Sun morning, min 25°C on Thu night). Wind will be generally light.

Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
0
1
1
0
1
1
0
2
2
1
2
0
0
1
1
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.4
SE
11
0.4
SE
11
0.9
SE
5
0.7
SE
8
0.7
ESE
8
0.7
ESE
8
0.4
SE
10
0.5
S
10
0.8
S
10
1
S
9
1
S
9
1
S
10
1
S
10
0.9
SSW
9
0.9
SSW
9
0.7
SSW
9
0.7
SSW
9
0.8
SSW
9
0.6
SSW
8
Wave Graph
Metric surfscale
Energy kJ
30
29
35
69
56
51
25
51
118
170
175
190
184
144
138
82
86
92
57
Wind (km/h)
0
NNE
5
ESE
10
SE
5
ENE
5
E
10
SE
0
SSE
5
E
5
SSE
5
W
5
ESE
10
SSE
5
NW
5
SE
10
SE
5
NNW
5
E
10
SSE
0
NNW
Wind State
glassy
on
cross-on
glassy
glassy
cross-on
glassy
glassy
cross-on
glassy
glassy
cross-on
glassy
on
on
glassy
glassy
cross-on
glassy
High Tide
8:59AM1.82m
8:58PM1.86m
9:48AM1.68m
9:27PM1.81m
10:51AM1.55m
10:01PM1.74m
12:28PM1.45m
10:49PM1.66m
2:49PM1.47m
00:11AM1.59m
4:10PM1.59m
2:01AM1.59m
Low Tide
2:46AM0.55m
2:54PM0.76m
3:27AM0.55m
3:26PM0.93m
4:16AM0.59m
4:02PM1.10m
5:20AM0.63m
4:54PM1.26m
6:46AM0.65m
6:52PM1.37m
8:20AM0.60m
9:07PM1.34m
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
thunderstorm
thunderstorm
part cloud
clear
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:26
5:26
5:26
5:28
5:28
5:30
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:46
6:45
6:45
6:44
6:43
6:42
6:39
 mm
3
3
1
3
1
1
3
2
Temp °C
26
27
28
26
28
28
26
28
28
26
29
29
26
29
29
26
30
29
26
Feels °C
31
32
32
31
33
33
31
33
33
31
32
32
30
32
32
32
34
32
32
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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