Surf Forecasts:
Mainside surf forecast from 23 Jul 2026:
- Most powerful swell: Friday 24 Jul, 9AM (local time) - 1ft (0.3m), 10s period, ENE swell with 19 kJ wave energy.
Best Forecast Surf Conditions for Mainside this week:
The most powerful waves expected at Mainside in the next 16 days are 0.3m 10s and forecast to arrive on Friday (Jul 24) at 9AM. 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 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9AM (Fri 24th Jul) | 1ft (0.3m) 10s |
Table - best surf conditions forecast for Mainside over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what we’ve got coming down the line.
Right now, we’re looking at a long, dry spell with barely a ripple on the surface. Honestly, don’t even bother waxing up for a while. From Friday the 24th of July all the way through to the Tuesday the 4th of August, it’s a dead zone of tiny, weak, or non-existent swell at Mainside. We're talking waves so small they barely register – the occasional 0.7 ft from the ENE, with combined energy values that are pathetic, mostly below 20. You’ll get some nice glassy or clean offshore mornings in there, especially Sunday the 26th and Wednesday the 29th, but there’s just nothing to ride. It’s a solid 11-day gap of flatness with poor water. The water temperature is sitting at 84°, which is about average for the time of year, so at least the paddle will be warm.
Now, things start to look a little more promising as we head into August. The swell finally starts filling in, but the wind is the problem. On Tuesday the 5th of August, we see a jump to 4 ft from the east with a 16-second period, and the combined energy hits a moderate 620. That looks okay, but it’s a north-east wind blowing cross-off, so it’s clean enough. That morning session is your first real chance, but it's marginal.
The standout in this whole outlook is Thursday the 6th of August. That morning we’ve got a solid 4 ft of east swell with a long 16-second period and moderate energy hitting 897. The wind is out of the north-east at 12 mph, blowing cross-off, so it should be clean. This is a proper groundswell, and a point break like Mainside will love that direction and long period. That’s the best window for a surfer who knows what they’re doing.
But hold up, it gets bigger but dirtier. Saturday the 8th of August looks big – 8 ft from the east with a very long 19-second period and very strong energy of 4555 – but the wind is onshore from the west at 9 mph. That’s a mess. The size is there, but it’ll be choppy and blown out. Only for the experts who don’t mind rough conditions.
Overall, the first week and a half is a write-off. The best bet is the morning of Thursday the 6th of August at Mainside – clean, fun-sized groundswell. The weekend after that is too big and windy for most.
- Rusty
Short Range ForecastLight rain (total 3mm), mostly falling on Sat night. Warm (max 30°C on Fri morning, min 27°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Mon night. Warm (max 30°C on Mon morning, min 27°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | |||||||||||||||
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) | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | E 9 | S 8 | S 9 | S 8 | S 8 | SE 10 | SE 10 | ESE 10 | SE 10 | SE 10 | SE 10 | ESE 9 | SW 9 | SW 9 | SW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 19 | 9 | 9 | 9 | 8 | 8 | 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-off | off | cross-off | cross-off | glassy | cross-off | off | off | off | off | off | off | off | glassy | glassy | glassy | cross-on | cross-on | glassy |
High Tide | 5:07PM1.50m | 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 | 9:49AM0.75m | 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 | |||||||
 |  |  | | |  | | | | | | | | | | | |  | | | | |
 | 5:48 | — | — | 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 | — | — | 2 | — | — | 1 | — | — | 3 | — | — | — | — | — | — |
Temp °C | 30 | 30 | 29 | 30 | 30 | 29 | 29 | 30 | 29 | 30 | 30 | 28 | 30 | 30 | 28 | 29 | 29 | 28 | 28 | 28 | 28 |
Feels °C | 33 | 33 | 34 | 35 | 35 | 34 | 33 | 34 | 34 | 34 | 33 | 32 | 32 | 33 | 32 | 34 | 34 | 33 | 33 | 30 | 33 |
Swell 1 Height (m) Direction Period (s) | ENE 10 | ENE 10 | SSE 8 | SSE 10 | SSE 9 | S 8 | S 9 | S 8 | S 9 | S 8 | S 8 | S 8 | S 7 | ESE 10 | SE 5 | ESE 5 | SE 10 | SW 8 | SW 9 | SW 9 | SW 9 |
| kJ | 19 | 9 | 33 | 71 | 82 | 66 | 73 | 52 | 39 | 33 | 20 | 11 | 10 | 19 | 7 | 5 | 15 | 11 | 20 | 20 | 31 |
Swell 2 Height (m) Direction Period (s) | SW 7 | SE 9 | ENE 10 | ENE 9 | ENE 9 | ESE 10 | SE 10 | SSW 10 | SW 8 | SW 9 | SW 9 | SE 10 | SE 10 | S 7 | SE 10 | SE 10 | ESE 5 | ESE 9 | ESE 9 | ESE 10 | ESE 10 |
| kJ | 2 | 3 | 9 | 9 | 8 | 10 | 16 | 10 | 17 | 23 | 12 | 16 | 16 | 10 | 15 | 15 | 2 | 17 | 17 | 18 | 9 |
Swell 3 Height (m) Direction Period (s) | SE 9 | SW 7 | SE 11 | SE 11 | ESE 11 | ENE 9 | E 9 | SW 8 | SW 10 | SE 10 | SE 10 | WSW 8 | SW 8 | SW 8 | S 7 | S 7 | SSW 7 | S 7 | S 7 | S 7 | SW 12 |
| kJ | 3 | 2 | 5 | 5 | 11 | 8 | 6 | 9 | 25 | 16 | 17 | 6 | 2 | 3 | 9 | 4 | 4 | 4 | 1 | 1 | 6 |
Wind waves Height (m) Direction Period (s) | SE 3 | SE 4 | — | — | — | — | — | — | ENE 2 | E 3 | ESE 3 | ESE 2 | ESE 3 | ESE 5 | ESE 5 | — | — | — | — | — | — |
| kJ | 2 | 3 | — | — | — | — | — | — | 1 | 1 | 1 | 1 | 4 | 9 | 17 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 59 | 59 | 14 | 10 | 10 | 14 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 735 | 10 | 36 | 683 | 41 | 36 | 830 | 10 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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.
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