Surf Forecasts:
Ikumi Beach surf forecast from 12 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 6AM (local time) - 3.5ft (1.1m), 10s period, E swell with glassy winds.
- Most powerful swell: Sunday 16 Aug, 9AM (local time) - 4ft (1.2m), 10s period, ESE swell with 275 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 6AM (local time) - 2.5ft (0.8m), 9s 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 Thursday (Aug 13) at 6AM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.3m and 4s. 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 1.2m 10s and forecast to arrive on Sunday (Aug 16) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Friday (Aug 14) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 13th Aug) | 2.5ft (0.8m) 9s |
| Best Surf | 6AM (Tue 18th Aug) | 3.5ft (1.1m) 10s |
| Most Powerful | 9AM (Sun 16th Aug) | 4ft (1.2m) 10s |
Table - best surf conditions forecast for Ikumi Beach over the next 16 days.
The Lowdown
G’day, Rusty here. Well, it’s a bit of a quiet stretch ahead for Ikumi Beach – don’t expect any pumping sessions just yet. The first week is mostly small and messy, with a few cleaner windows, but nothing to get too excited about. The real standout is way out in the second week, and it’s a big one, but it comes with a serious caveat.
Starting off on Thursday 13 August, it’s a write-off. Morning and afternoon both have risk of thunderstorms, onshore wind from the ESE at 6 mph, and only 2 ft of weak, short-period SSW swell. The wave energy is weak (120). Poor conditions all round.
Friday 14 August morning looks a bit more promising. Skies clear, wind drops to a glassy 3 mph from the east, and there’s 2 ft of S swell at 9 seconds. The energy is still weak (91), but the clean surface makes it surfable – just very ordinary. Friday afternoon sees a shift to a cross-shore S wind at 6 mph and poor surf again.
Saturday 15 August morning offers another glassy window with clear skies, east wind at 3 mph, and 2 ft of S swell (period 10 seconds). Energy is moderate (142), but still just surfable and ordinary. Saturday afternoon goes back to onshore and poor.
Sunday 16 August morning has a bit more size – 4 ft of ESE swell at 10 seconds, with moderate energy (361) – but the wind is a light cross-onshore from the east at 6 mph. It’s marginal, not great. After that, the pattern of onshore winds and poor conditions continues through Monday 17, Tuesday 18, and Wednesday 19 August. Wednesday morning is glassy with 1 ft of SE swell (energy only 50) – surfable but tiny.
Thursday 20 August afternoon finally shows some improvement. A clean cross-offshore wind from the SSW at 9 mph and 4 ft of SE swell at 9 seconds (moderate energy 198). Surfable but still ordinary.
Friday 21 August morning is glassy with 3 ft SSE swell (8 seconds, energy 127) – again surfable but nothing special.
Now, Saturday 22 August morning is the first real highlight of the period. Glassy conditions with clear skies, ESE wind at 3 mph, and 4 ft of S swell at 10 seconds. The combined energy is moderate (261) and the guidance says expect good surf conditions. That’s your best bet in the first week – clean, fun waves.
Then there’s a gap of a few days with poor or marginal surf through Sunday 23 and Monday 24 August.
But hold onto your board – Tuesday 25 August morning brings a massive pulse. The swell jumps to 10 ft from the SE with a very long period of 16 seconds. The energy is extremely strong (4970). The wind is light cross-onshore from the east at 3 mph, and conditions are favorable. However, this is way too big for Ikumi Beach – it’s an exposed beginner spot, and 10 ft of groundswell with that period will be dangerous and unsurfable for most. This is strictly for experts only, and even then, a beach break with that much power and long period can close out and be tricky. The afternoon is similar at 10 ft, 14 seconds, with energy at 3310.
After that, Wednesday 26 through Friday 28 August sees the swell drop back to 3 ft–4 ft with onshore or cross-onshore winds and marginal conditions.
So, the standout session is Saturday 22 August morning – clean, glassy, and 4 ft of S swell. The big pulse on 25 August is a monster, but it’s one for the tow crew only. Keep an eye on the forecasts – things can change.
Stay safe,
Rusty
Short Range ForecastHeavy rain (total 21mm), heaviest during Thu morning. Warm (max 29°C on Sat morning, min 24°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 39mm), heaviest during Sat night. Warm (max 29°C on Tue morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 9 | S 10 | S 9 | ESE 6 | ESE 10 | E 10 | ESE 10 | ESE 9 | E 9 | ESE 10 | E 10 | ESE 9 | SE 10 |
Wave Graph | |||||||||||||||||||
83 | 88 | 86 | 79 | 73 | 73 | 54 | 94 | 81 | 90 | 275 | 70 | 72 | 193 | 64 | 145 | 225 | 55 | 26 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | on | glassy | glassy | cross | glassy | glassy | on | cross-on | cross-on | on | on | on | on | on | on | on | glassy |
High Tide | 5:34AM1.93m | 6:47PM1.92m | 6:16AM1.99m | 7:13PM1.94m | 6:56AM2.01m | 7:39PM1.94m | 7:35AM1.99m | 8:04PM1.93m | 8:16AM1.92m | 8:30PM1.90m | 8:59AM1.82m | 8:58PM1.86m | |||||||
Low Tide | 11:55PM0.95m | 12:13PM0.24m | 00:28AM0.83m | 12:48PM0.27m | 1:01AM0.72m | 1:20PM0.34m | 1:34AM0.63m | 1:52PM0.45m | 2:09AM0.57m | 2:23PM0.59m | 2:46AM0.55m | 2:54PM0.76m | |||||||
— | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | |
6:52 | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:46 | — | — | 6:45 | — | |
mm | 5 | 5 | 4 | 1 | 1 | 3 | — | — | 2 | 15 | 1 | 1 | 5 | 8 | 6 | 3 | — | — | — |
Temp °C | 25 | 27 | 27 | 25 | 28 | 28 | 25 | 29 | 29 | 25 | 27 | 28 | 26 | 26 | 27 | 26 | 29 | 28 | 26 |
Feels °C | 29 | 30 | 31 | 30 | 31 | 31 | 29 | 32 | 32 | 29 | 30 | 31 | 30 | 29 | 31 | 30 | 32 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | S 9 | SSW 9 | SSW 9 | S 9 | S 9 | S 9 | S 9 | S 10 | S 9 | S 9 | S 8 | E 10 | ESE 10 | S 8 | E 9 | SE 5 | ESE 9 | ESE 9 | SE 6 |
83 | 88 | 86 | 79 | 73 | 73 | 54 | 94 | 81 | 79 | 52 | 70 | 72 | 35 | 64 | 27 | 100 | 55 | 15 | |
Swell 2 Height (m) Direction Period (s) | SW 10 | SE 12 | E 9 | ESE 4 | ESE 4 | E 9 | S 11 | E 10 | ESE 9 | ESE 10 | SE 12 | S 9 | S 8 | SE 11 | SSW 9 | E 10 | SSW 8 | SSW 8 | SE 10 |
26 | 23 | 7 | 10 | 3 | 27 | 38 | 30 | 29 | 31 | 21 | 59 | 36 | 19 | 25 | 48 | 22 | 21 | 26 | |
Swell 3 Height (m) Direction Period (s) | SE 12 | E 10 | SE 12 | E 10 | E 9 | SE 11 | E 9 | SE 11 | SE 8 | SE 12 | SE 18 | SE 11 | SE 11 | — | SE 11 | SSW 8 | SE 11 | SE 10 | SSW 8 |
24 | 7 | 22 | 16 | 15 | 19 | 27 | 18 | 10 | 22 | 13 | 20 | 19 | — | 30 | 23 | 29 | 28 | 13 | |
Wind waves Height (m) Direction Period (s) | ESE 4 | ESE 3 | ESE 4 | — | SW 4 | — | — | — | — | ESE 6 | ESE 10 | ESE 6 | ESE 6 | ESE 9 | ESE 5 | ESE 10 | E 10 | — | — |
5 | 2 | 8 | — | 4 | — | — | — | — | 90 | 275 | 68 | 49 | 193 | 33 | 145 | 225 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 30 | 33 | 0 | 0 | 4 | 0 | 0 | 33 | 14 | 30 | 486 | 30 | 30 | 30 | 30 | 30 | 486 | 0 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











