
Surf Forecasts:
Mainside surf forecast from 24 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 6AM (local time) - 0.5ft (0.2m), 10s period, ENE swell with 9 kJ wave energy.
Best Forecast Surf Conditions for Mainside this week:
The most powerful waves expected at Mainside in the next 16 days are 0.2m 10s and forecast to arrive on Saturday (Jul 25) at 6AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 9s period and expected on Saturday (Jul 25) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 6AM (Sat 25th Jul) | 0.5ft (0.2m) 10s |
Table - best surf conditions forecast for Mainside over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s have a long, hard look at what’s coming down the pipe for Mainside. I’ve got to be straight with you—the next week or so is going to be a tough watch. The swell window is just about closed for a stretch.
We’re looking at a pretty stark gap here. From Saturday the 25th of July all the way through to Sunday the 2nd of August, the ocean is flat or offering nothing but tiny, weak scraps. It’s all 0.7ft or less, or showing a big fat zero. You’ll see some glassy mornings and clean conditions, but with no swell to work with, it’s more of a flat-water paddle or a beach stroll.
Things finally start to flicker on Monday the 3rd of August. A long-period pulse shows up in the afternoon—1ft from the east at a very long 16 seconds. The energy is still weak (82), so it’s not going to be any kind of session. But that’s the first sign of life.
Then, Tuesday the 4th of August is where it gets interesting. The morning brings a clean 4ft easterly groundswell with a 16-second period, and a gentle offshore wind from the ESE. The combined energy jumps to a moderate 635. That’s our first real window. The afternoon cleans up even more, with 4ft from the east at 18 seconds and a light offshore breeze, pushing the energy to 889. This is the standout of the whole run—clean, lined-up, east swell at an exposed reef.
Wednesday the 5th sees the swell build further. We’re talking 5ft from the east with a 17-second period in the morning, and the energy is up to a strong 1502. The wind stays offshore from the ESE. This is solid, powerful groundswell, but heads up: at 5ft, it’s getting into the territory where beginners might start to struggle. The afternoon holds 5ft at 19 seconds and a clean cross-offshore breeze. This is excellent, but only for experienced surfers. Thursday the 6th peaks right there with 6ft from the east-northeast, 18-second periods, and a glassy afternoon. Energy hits 1910 in the morning—that’s serious power. Again, this is expert-only territory; over 5ft.
Friday the 7th drops off a bit to 2ft from the northeast, still a very long 15-second period, but the energy is down to 220. The afternoon brings a 3ft northerly windswell with a short 8-second period but glassy conditions.
After that, Saturday the 8th turns windy and ordinary—4ft from the north-northwest but with a horrible 5-second period and a moderate breeze. That’s more of a kite-surfing chop than a surfable wave.
So, to wrap it up: the only game in town is Mainside itself. It’s a consistent reef break that’s exposed and handles an east swell well. The water temp is about average for this time of year. The first week is a total write-off. The real action hits from Tuesday the 4th through Thursday the 6th of August—that’s your window. If you’re an experienced surfer, Wednesday and Thursday mornings with that offshore wind and big east swell are as good as it gets here. Don’t expect any crowds, but the power will be on.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat night. Warm (max 30°C on Sat morning, min 27°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Wed afternoon. Warm (max 30°C on Tue morning, min 27°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | ||||||||||||||
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) | ENE 10 | ENE 9 | ENE 9 | ENE 9 | S 9 | S 8 | SSE 9 | SW 10 | SW 9 | S 8 | SE 10 | ESE 10 | E 9 | SE 10 | SE 10 | SW 9 | SW 9 | SW 9 | SW 9 |
Wave Graph | |||||||||||||||||||
9 | 9 | 8 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 0 | 0 | 0 | 0 | 0 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | glassy | cross-on | glassy | cross-on | cross | cross |
High Tide | 3:20AM1.72m | 6:11PM1.60m | 4:25AM1.74m | 6:48PM1.70m | 5:17AM1.79m | 7:16PM1.79m | 5:59AM1.86m | 7:39PM1.87m | 6:36AM1.94m | 8:02PM1.93m | 7:11AM2.02m | 8:25PM1.99m | |||||||
Low Tide | 9:28PM1.33m | 10:56AM0.66m | 11:01PM1.33m | 11:46AM0.56m | 11:59PM1.28m | 12:24PM0.47m | 00:37AM1.21m | 12:56PM0.39m | 1:09AM1.13m | 1:25PM0.32m | 1:37AM1.03m | 1:54PM0.28m | 2:05AM0.93m | ||||||
— | 5:50 | — | — | 5:50 | — | — | 5:50 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | |
7:21 | — | 7:20 | — | — | 7:20 | — | — | 7:19 | — | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — | |
mm | — | — | — | 1 | — | 1 | 1 | — | — | — | — | — | 3 | — | 5 | — | — | — | — |
Temp °C | 29 | 30 | 30 | 29 | 29 | 30 | 28 | 29 | 30 | 28 | 30 | 30 | 28 | 29 | 29 | 29 | 28 | 29 | 28 |
Feels °C | 33 | 36 | 35 | 34 | 33 | 34 | 31 | 33 | 34 | 32 | 33 | 33 | 32 | 34 | 34 | 34 | 32 | 33 | 32 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 10 | SSE 9 | S 8 | S 9 | S 8 | SSE 9 | S 8 | S 8 | S 8 | SE 10 | ESE 10 | SE 10 | ESE 5 | SE 10 | SW 9 | SW 9 | SW 9 | SW 9 |
32 | 72 | 82 | 50 | 60 | 37 | 44 | 33 | 21 | 18 | 16 | 19 | 16 | 4 | 15 | 12 | 12 | 12 | 13 | |
Swell 2 Height (m) Direction Period (s) | ENE 10 | ENE 9 | ENE 9 | ESE 10 | SSW 8 | SSW 9 | SW 8 | SW 10 | SW 9 | SE 10 | S 7 | S 7 | S 7 | SE 10 | ESE 5 | ESE 9 | ESE 9 | ESE 9 | ESE 9 |
9 | 9 | 8 | 10 | 13 | 32 | 17 | 32 | 21 | 16 | 10 | 9 | 4 | 15 | 2 | 17 | 8 | 9 | 8 | |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 11 | ESE 11 | ENE 9 | SE 10 | SE 11 | SW 10 | SE 10 | SE 10 | SW 8 | WSW 8 | SW 8 | E 9 | SW 8 | SW 8 | ESE 5 | SE 5 | SW 9 | SW 10 |
5 | 5 | 11 | 8 | 16 | 18 | 17 | 17 | 17 | 11 | 7 | 3 | 7 | 2 | 10 | 2 | 1 | 3 | 4 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | ENE 2 | ENE 3 | E 3 | — | ESE 2 | ESE 4 | ESE 4 | ESE 3 | — | — | — | — | — | — |
— | — | — | — | — | 1 | 2 | 1 | — | 1 | 3 | 3 | 2 | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 735 | 652 | 36 | 36 | 73 | 36 | 830 | 830 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Information about the Mainside Surf forecast
The above surf forecast table for Mainside provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Mainside can be found by selecting the local surf guide option on the grey menu. Our Mainside 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 (Mainside) 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 Mainside 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.
Mainside is 11 km (7 miles) from the city of Ishikawa. If you plan a holiday in Okinawa, look for hotels and other accommodation in Ishikawa. Ishikawa has rooms for a wide range of budgets as well as car hire and transport links.










