Surf Forecasts:
Mainside surf forecast from 13 Jul 2026:
- Most powerful swell: Saturday 18 Jul, 9PM (local time) - 2.5ft (0.7m), 7s period, W swell with 48 kJ wave energy.
Best Forecast Surf Conditions for Mainside this week:
The most powerful waves expected at Mainside in the next 16 days are 0.7m 7s and forecast to arrive on Saturday (Jul 18) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 7s period and expected on Saturday (Jul 18) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9PM (Sat 18th Jul) | 2.5ft (0.7m) 7s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Alright folks, Rusty here. Let’s be straight with you – this outlook is a tough one. We’re looking at a solid 16-day window at Mainside, but honestly, it’s a flat spell of nothing special. The surf just isn't showing up. There are no good options on the table for the whole period. The first few days are a write-off, and that trend sticks around.
From the start on Monday, July 13th, the water’s a bit colder than normal for this time of year, sitting at 82°F. The swell is tiny, barely a ripple at 1 ft from the west, but with a 16 mph cross-offshore SSE wind, it’s clean but completely flat. The combined energy is weak, only 13. There’s nothing to get excited about. Tuesday the 14th and Wednesday the 15th are even worse, with swell dropping to 0.7 ft and shifting direction. The wind stays cross or cross-on, making it choppy and messy.
Thursday the 16th sees a bit of a bump to 2 ft from the west, but the period is a shocking 4 seconds – that’s just wind slop. Energy is still low at 16, and with a cross-onshore wind, it’s not worth a paddle. The pattern continues: Friday and Saturday offer nothing but small, weak, and often choppy conditions. The combined energy values are all in the single digits or low teens – that’s as weak as it gets.
The second week doesn’t bring any relief. From Sunday, July 19th, through to the end of the month, it’s the same story. Monday the 20th and Tuesday the 21st have clean conditions with cross-offshore winds, but the swell is 0.7 ft – that’s a lake, not a surf break. The energy is 7 or 9. There’s a moment on Thursday morning, July 23rd, that looks glassy, with 2 ft from the west and a 7-second period, pushing energy to 37, but it’s still poor surf. Even the best day – Friday, July 24th – has a 1 ft swell from the east with a 10-second period and offshore wind, but the energy is only 41. That’s clean, but tiny.
For a break like Mainside that is consistent, this blank run is a bit of a shock. It tends not to stay this poor for long, and forecasts can change. But right now, there’s nothing to recommend. The entire 16 days is a gap. If you’re desperate for a paddle, the glassy early morning on July 23rd or the clean offshore on July 24th might be the only windows, but you’ll be fighting for knee-high waves. The water temperature gradually warms up without any major anomaly. Just keep your board in the car and your eyes on the horizon.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Mon afternoon, min 27°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sat morning. Warm (max 29°C on Fri morning, min 28°C on Thu afternoon). Wind will be generally light. | ||||||||||||||||||||
Mon 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | W 9 | W 8 | E 9 | E 9 | WSW 10 | E 9 | SW 10 | E 10 | E 10 | W 5 | WNW 5 | E 10 | W 6 | W 7 | E 10 | E 10 | W 7 | W 7 | E 10 | E 9 | E 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 13 | 5 | 7 | 6 | 0 | 7 | 0 | 7 | 9 | 10 | 8 | 7 | 19 | 32 | 7 | 8 | 26 | 25 | 7 | 6 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross-on | cross | cross | cross | cross-off | cross-off |
High Tide | 7:21PM1.97m | 6:27AM2.15m | 8:01PM2.04m | 7:16AM2.21m | 8:39PM2.07m | 8:02AM2.23m | 9:14PM2.08m | 8:47AM2.19m | 9:49PM2.07m | 9:32AM2.11m | 10:23PM2.04m | 10:17AM1.97m | 10:58PM1.99m | 11:06AM1.81m | |||||||
Low Tide | 00:48AM1.04m | 1:22PM0.04m | 1:34AM0.95m | 2:05PM0.03m | 2:17AM0.87m | 2:46PM0.08m | 2:59AM0.79m | 3:25PM0.18m | 3:41AM0.75m | 4:02PM0.33m | 4:25AM0.73m | 4:39PM0.51m | 5:13AM0.73m | ||||||||
 |  | |  | | | | | | | | | | |  | |  | | | | | |
 | — | — | 5:43 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 |
 | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | 7:22 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | — | — | — | — |
Temp °C | 29 | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 30 |
Feels °C | 30 | 31 | 32 | 31 | 32 | 31 | 31 | 32 | 32 | 30 | 31 | 32 | 32 | 31 | 32 | 32 | 31 | 31 | 31 | 32 | 33 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 9 | S 8 | S 8 | WSW 10 | S 8 | ESE 11 | E 10 | SW 10 | SW 10 | SW 9 | W 8 | W 6 | SW 8 | ESE 9 | E 10 | W 7 | W 7 | SW 7 | SW 8 | SW 9 |
| kJ | 276 | 155 | 113 | 68 | 72 | 11 | 22 | 7 | 74 | 74 | 54 | 4 | 19 | 84 | 8 | 8 | 26 | 25 | 160 | 122 | 115 |
Swell 2 Height (m) Direction Period (s) | SW 8 | WSW 9 | WSW 9 | SW 10 | SSW 8 | E 9 | S 7 | S 8 | E 10 | E 9 | WNW 5 | E 10 | E 10 | W 7 | E 10 | SE 9 | ESE 10 | E 10 | SW 8 | E 9 | E 9 |
| kJ | 35 | 54 | 59 | 76 | 39 | 7 | 10 | 4 | 7 | 6 | 8 | 7 | 7 | 32 | 7 | 3 | 18 | 7 | 18 | 6 | 7 |
Swell 3 Height (m) Direction Period (s) | W 9 | W 8 | E 9 | E 9 | SSE 8 | SE 11 | SSW 10 | S 10 | SSW 10 | S 7 | E 10 | SE 10 | SE 9 | ESE 9 | N 6 | N 6 | E 14 | SE 9 | E 10 | SE 9 | SE 9 |
| kJ | 13 | 5 | 7 | 6 | 11 | 5 | 10 | 8 | 10 | 4 | 7 | 4 | 3 | 8 | 1 | 1 | 4 | 3 | 7 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SSW 3 | SW 10 | SW 10 | SW 10 | W 4 | W 5 | SSW 2 | SW 9 | SW 7 | — | WSW 8 | SW 7 | SW 8 | SW 8 | SSW 8 | S 3 | SSE 3 |
| kJ | — | — | — | — | 3 | 170 | 163 | 115 | 9 | 10 | 1 | 135 | 88 | — | 171 | 223 | 203 | 187 | 147 | 1 | 6 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 696 | 14 | 14 | 73 | 73 | 600 | 608 | 600 | 37 | 678 | 608 | 683 | 652 | 600 | 74 | 622 | 622 | 73 | 73 | 14 | 652 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Mainside surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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