Surf Forecasts:
Mainside surf forecast from 26 Jul 2026:
- Most powerful swell: Sunday 2 Aug, 6PM (local time) - 1ft (0.3m), 16s period, E swell with 46 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 16s and forecast to arrive on Sunday (Aug 02) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 8s period and expected on Monday (Jul 27) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 6PM (Sun 2nd Aug) | 1ft (0.3m) 16s |
Table - best surf conditions forecast for Mainside over the next 16 days.
The Lowdown
Alright, Rusty here again, but in feet and knots for you.
Let's break down Mainside.
First up, the next few days are a total bust. Nothing at all from now until the end of July – flat, ugly, no surf. That's a dead stretch of several days.
We get a whisper of movement on Friday the 31st of July: tiny 0.7ft waves from the east, short period, and a light cross-onshore breeze. Combined energy is weak (7). Not worth a look. Saturday is even smaller. The whole first weekend is a dud.
Sunday the 2nd of August shows a little more – 1ft from the west, but period is only 7 seconds, combined energy 14, and it's cross-onshore. That afternoon gets a weird long period of 17 seconds on a 0.7ft wave – direction is wrong for Mainside and conditions stay poor.
The first real signal comes Monday the 3rd of August. Swell builds to 2ft from the east with a decent 14-second period, combined energy 152 – moderate energy now. But wind is cross-onshore from the north at 12 mph, keeping it choppy. Tuesday the 4th sees swell up to 3ft, period 16-17 seconds, combined energy jumping to 451-519 (strong energy). Still, that north wind messes up the surface.
Wednesday the 5th of August holds around 3ft to 4ft, long period, energy in the 475-569 range. Wind remains cross-onshore, some thunderstorms possible. Ordinary.
Now for the highlight. Thursday the 6th of August is the one to aim for. Morning is glassy – dead calm wind from the north. Swell is a clean 4ft from the east, with a very long 16-second period, combined energy at 641 (strong). That's a proper groundswell for Mainside's reef. Glassy conditions mean clean, lined-up sets. This is for experienced surfers – that much energy and long period will pack a punch.
Friday the 7th of August is nearly as good. Morning glassy again, swell drops a little to 3ft, period still long at 16 seconds, energy 546. Afternoon stays glassy with a light northeast breeze.
Saturday the 8th of August has offshore wind from the ESE at 9 mph, swell 3ft, period 14 seconds, energy 340. Clean and fun.
After that, the second week fades. Sunday the 9th gets offshore wind but short period (7 seconds) and weaker energy. Monday and Tuesday the 10th and 11th are small and marginal.
So here's the call: skip this week. Your window is Thursday 6th and Friday 7th of August. Glassy, solid 3ft+ groundswell, strong energy, and a reef that loves that long period. Be on it.
– Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Tue night. Warm (max 30°C on Mon morning, min 28°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Thu afternoon, min 28°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | ||||||||||||||
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 9 | S 8 | SE 10 | SE 10 | SE 10 | ESE 10 | SE 10 | SE 10 | ESE 10 | ESE 9 | ESE 9 | SW 8 | E 13 | E 10 | E 9 | E 9 | E 9 | E 9 | W 6 |
Wave Graph  | |||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 7 | 6 | 6 | 7 | 2 | 2 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | off | off | off | off | on | cross-off | glassy | cross-on | glassy | cross-on | on | on | on | on | cross-on |
High Tide | 5:17AM1.79m | 7:16PM1.79m | 5:59AM1.86m | 7:39PM1.87m | 6:36AM1.94m | 8:02PM1.93m | 7:11AM2.02m | 8:25PM1.99m | 7:46AM2.08m | 8:49PM2.03m | 8:23AM2.11m | 9:15PM2.06m | |||||||
Low Tide | 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 | 2:23PM0.27m | 2:35AM0.83m | 2:54PM0.31m | |||||||
 |  |  | | | | |  | |  | | |  | | | | | | | |
 | — | 5:50 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — |
 | 7:20 | — | 7:19 | — | — | 7:19 | — | — | 7:17 | — | — | 7:17 | — | — | 7:16 | — | — | 7:15 | — |
mm | 1 | — | — | 2 | — | — | 6 | 3 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 30 | 30 | 29 | 30 | 30 | 29 | 29 | 29 | 28 | 28 | 29 | 28 | 28 | 29 | 28 | 28 | 29 | 28 |
Feels °C | 34 | 34 | 32 | 33 | 33 | 32 | 33 | 34 | 34 | 32 | 33 | 33 | 33 | 32 | 32 | 32 | 31 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | S 8 | S 8 | S 8 | SE 10 | ESE 10 | SE 10 | SE 10 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 | SW 8 |
| kJ | 26 | 33 | 20 | 11 | 16 | 19 | 16 | 15 | 18 | 17 | 17 | 9 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
Swell 2 Height (m) Direction Period (s) | SW 8 | SW 9 | SE 10 | SE 10 | S 8 | S 8 | SW 8 | ESE 5 | SW 8 | SW 8 | SW 8 | SW 8 | ESE 9 | E 10 | SE 10 | E 9 | E 9 | SE 9 | W 6 |
| kJ | 17 | 12 | 27 | 16 | 4 | 4 | 2 | 2 | 10 | 9 | 10 | 10 | 8 | 7 | 4 | 6 | 7 | 3 | 2 |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 10 | SW 8 | WSW 8 | SW 8 | SW 8 | S 7 | SW 8 | ESE 5 | SE 5 | SE 5 | S 7 | E 13 | SE 9 | E 9 | N 5 | SE 8 | E 9 | E 9 |
| kJ | 18 | 17 | 10 | 6 | 2 | 2 | 4 | 9 | 2 | 1 | 1 | 1 | 3 | 3 | 6 | 1 | 3 | 2 | 1 |
Wind waves Height (m) Direction Period (s) | — | — | ESE 2 | SE 4 | ESE 4 | ESE 4 | ESE 5 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 1 | 4 | 2 | 4 | 4 | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 10 | 10 | 14 | 10 | 10 | 1014 | 652 | 73 | 36 | 652 | 660 | 995 | 976 | 760 | 849 | 652 | 1548 | 1019 | 652 |
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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