Surf Forecasts:
Mainside surf forecast from 12 Jul 2026:
- Best quality surf: Sunday 19 Jul, 12AM (local time) - 1.5ft (0.5m), 11s period, E swell with cross-offshore winds.
- Most powerful swell: Sunday 12 Jul, 6PM (local time) - 3.5ft (1.0m), 10s period, W swell with 196 kJ wave energy.
- Next surfable swell (1★+): Sunday 19 Jul, 12AM (local time) - 1.5ft (0.5m), 11s period with E swell.
Best Forecast Surf Conditions for Mainside this week:
The surf forecast for Mainside over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Jul 19) at 12AM. The primary swell is predicted to be 0.5m and 11s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Mainside in the next 16 days are 1.0m 10s and forecast to arrive on Sunday (Jul 12) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 10s period and expected on Sunday (Jul 12) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 19th Jul) | 1.5ft (0.5m) 11s |
| Best Surf | 12AM (Sun 19th Jul) | 1.5ft (0.5m) 11s |
| Most Powerful | 6PM (Sun 12th Jul) | 3.5ft (1.0m) 10s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Alright, let’s break it down. This 16-day window is mostly flat at Mainside. There’s a big stretch of nothing from the start through the 18th of July—about a week of no waves.
The first real chance comes Sunday morning, the 19th of July. A tiny 2ft swell from the east, with a period of 11 seconds. That’s a groundswell, which is a good sign. The combined energy is weak (76). The wind is light offshore from the ESE, making it clean. Water temp is 84°, right around average for the time of year. It’s surfable, but nothing special.
Monday morning, the 20th of July, is similar: 2ft from the ENE, period 9 seconds, with clean offshore wind from the SE. Energy is still low (49). Small and clean, but weak.
Tuesday the 21st of July keeps the same tiny 2ft east swell, with light offshore winds in the morning. Clean, but small.
The standout of the whole period is Wednesday morning, the 22nd of July. This is the only day with moderate wave energy (101). Swell height bumps up to 3ft from the east, period 9 seconds, with a clean cross-off wind from the NE. This is the best on offer—small but with more push and shape. Crowds are possible at Mainside, so get there early.
After that, wave heights drop to 1ft to 2ft through the rest of the week, with cross and cross-on winds, so quality fades. By Saturday the 25th of July, we get a glassy morning with 1ft, but it’s barely anything.
Overall, this is a quiet period for Mainside. The best bet is the 22nd of July, with the cleanest conditions and the most energy. Otherwise, it’s a lot of waiting.
Rusty.
Short Range ForecastMostly dry. Warm (max 30°C on Mon afternoon, min 27°C on Mon night). Winds decreasing (fresh winds from the SSE on Sun morning, light winds from the S by Tue night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Fri night. Warm (max 30°C on Fri afternoon, min 28°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
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) | W 11 | W 10 | W 9 | W 11 | W 10 | W 8 | E 9 | E 9 | E 9 | E 9 | W 4 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 15 | SW 9 | E 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 151 | 247 | 81 | 9 | 28 | 4 | 7 | 6 | 6 | 7 | 3 | 7 | 7 | 7 | 7 | 7 | 17 | 7 | 18 | 0 | 61 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross-on | cross | cross-on | cross-on | cross-on | on | on | glassy | cross | cross-off | cross-off |
High Tide | 6:35PM1.88m | 5:35AM2.07m | 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 | ||||||||
Low Tide | 11:45AM0.23m | 11:57PM1.12m | 12:36PM0.11m | 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 | ||||||||
 |  |  | | | | | | | | |  | | | | | |  | |  |  | |
 | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — |
 | — | 7:24 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | 2 | 2 |
Temp °C | 29 | 29 | 28 | 29 | 30 | 28 | 29 | 30 | 28 | 28 | 29 | 28 | 29 | 29 | 28 | 29 | 30 | 29 | 29 | 29 | 28 |
Feels °C | 29 | 30 | 29 | 31 | 32 | 32 | 32 | 33 | 32 | 31 | 32 | 33 | 33 | 33 | 33 | 34 | 34 | 34 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 12 | SW 11 | SW 10 | SW 9 | S 9 | S 9 | SW 10 | SSW 8 | SSW 8 | SSW 10 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 | SW 8 |
| kJ | 1269 | 563 | 142 | 40 | 235 | 126 | 32 | 119 | 92 | 164 | 128 | 150 | 167 | 77 | 110 | 99 | 79 | 79 | 79 | 75 | 45 |
Swell 2 Height (m) Direction Period (s) | W 11 | W 10 | W 9 | W 8 | SW 8 | SW 9 | E 9 | SW 9 | SW 11 | E 9 | ESE 11 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | W 6 | ESE 10 | ESE 13 | E 11 |
| kJ | 151 | 247 | 81 | 35 | 35 | 40 | 7 | 30 | 40 | 7 | 22 | 7 | 7 | 7 | 7 | 7 | 17 | 5 | 18 | 60 | 61 |
Swell 3 Height (m) Direction Period (s) | — | — | SE 13 | W 11 | W 10 | W 8 | W 7 | E 9 | E 9 | SE 11 | S 7 | S 7 | S 7 | SSW 10 | S 7 | S 7 | W 6 | E 10 | E 15 | S 6 | E 15 |
| kJ | — | — | 7 | 9 | 28 | 4 | 4 | 6 | 6 | 5 | 1 | 4 | 4 | 10 | 4 | 1 | 3 | 7 | 18 | 1 | 18 |
Wind waves Height (m) Direction Period (s) | SSE 11 | S 11 | S 10 | S 9 | — | SSE 3 | S 8 | — | S 8 | S 8 | W 4 | SSW 2 | W 4 | WSW 4 | — | — | — | — | — | — | — |
| kJ | 1783 | 1045 | 573 | 375 | — | 4 | 143 | — | 72 | 74 | 3 | 1 | 3 | 6 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 618 | 618 | 618 | 622 | 683 | 14 | 14 | 14 | 14 | 73 | 600 | 73 | 608 | 608 | 73 | 39 | 765 | 10 | 10 | 10 | 0 |
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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