Surf Forecasts:
Mainside surf forecast from 10 Aug 2026:
- Best quality surf: Monday 10 Aug, 9PM (local time) - 3ft (0.9m), 13s period, E swell with offshore winds.
- Most powerful swell: Monday 10 Aug, 9PM (local time) - 3ft (0.9m), 13s period, E swell with 268 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 9PM (local time) - 3ft (0.9m), 13s 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 Monday (Aug 10) at 9PM. The primary swell is predicted to be 0.9m and 13s period with a secondary swell of 0.7m and 7s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Mainside in the next 16 days are 0.9m 13s and forecast to arrive on Monday (Aug 10) at 9PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 11s period and expected on Monday (Aug 10) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 10th Aug) | 3ft (0.9m) 13s |
| Best Surf | 9PM (Mon 10th Aug) | 3ft (0.9m) 13s |
| Most Powerful | 9PM (Mon 10th Aug) | 3ft (0.9m) 13s |
Table - best surf conditions forecast for Mainside over the next 16 days.
The Lowdown
Rusty here again. Let me tell you what I’m seeing for Mainside.
Alright, it’s gonna be a tough stretch. On Monday, August 10th, we get a tiny little window of surfable waves, but it’s nothing special. Swell is about 3ft from the west, with a moderate offshore breeze out of the southeast keeping it clean. The water temperature is 85°, which is about normal for this time of year. The combined swell energy is moderate (168). It’s surfable, but just barely.
From Tuesday the 11th all the way to Saturday the 22nd of August, it’s a long, flat spell. Wave heights drop to 2ft or less, periods are short, and the energy readings are tiny (mostly under 50). The wind is often offshore, which would be a dream if there were any waves, but there just aren’t any. The models are calling it “poor surf conditions” for almost every single session.
Then on Thursday the 20th of August, the afternoon shows a pulse of 4ft swell from the east, but with a short, weak period of just 7 seconds and a combined energy of 114 (moderate). The wind is a fresh cross-offshore breeze, so it’s clean, but the quality is still poor. With that kind of bumpy, short-period wind swell and the open setup here, it might actually be more fun for a kite surfer than a surfer.
After that, it’s back to tiny, insignificant waves through the end of the outlook on the 25th of August. Nothing stands out as good. This is just one of those quiet periods.
Keep an eye on it though – in these parts, it never stays flat for long.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Wed morning. Warm (max 30°C on Tue afternoon, min 26°C on Wed morning). Winds decreasing (fresh winds from the SSW on Wed afternoon, calm by Thu morning). | Days 5-7 Weather SummaryHeavy rain (total 33mm), heaviest during Fri morning. Warm (max 29°C on Fri afternoon, min 27°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | ||||||||||||||
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 10 | E 12 | E 12 | E 12 | ENE 12 | ENE 11 | W 8 | N 9 | N 8 | N 7 | N 8 | N 7 | W 7 | WNW 6 | W 6 | W 6 | ENE 10 | E 6 | ENE 10 | ENE 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 116 | 113 | 73 | 72 | 46 | 40 | 18 | 24 | 28 | 25 | 21 | 16 | 15 | 45 | 28 | 30 | 20 | 25 | 20 | 20 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | cross-off | cross-off | cross | cross | cross-off | off | off | off | off | glassy | off | off | cross-off | off | off | off | off |
High Tide | 6:33PM1.89m | 5:36AM2.05m | 7:10PM2.00m | 6:28AM2.16m | 7:43PM2.07m | 7:14AM2.24m | 8:13PM2.13m | 7:57AM2.27m | 8:42PM2.15m | 8:37AM2.24m | 9:11PM2.15m | 9:15AM2.15m | 9:39PM2.13m | |||||||
Low Tide | 11:59PM1.13m | 12:31PM0.21m | 00:45AM0.97m | 1:14PM0.15m | 1:25AM0.82m | 1:52PM0.15m | 2:03AM0.69m | 2:27PM0.21m | 2:39AM0.60m | 3:00PM0.32m | 3:15AM0.54m | 3:31PM0.46m | ||||||||
 |  |  |  | | |  |  | | | | | | | | | | | | | |
 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — |
 | 7:09 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:05 | — |
mm | — | 2 | 2 | — | 3 | 4 | 2 | 2 | — | 4 | 1 | 7 | 2 | 4 | 4 | 5 | 2 | 4 | 4 | 3 |
Temp °C | 29 | 28 | 29 | 30 | 28 | 27 | 26 | 26 | 28 | 28 | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 30 | 31 | 33 | 34 | 32 | 28 | 26 | 28 | 33 | 32 | 31 | 34 | 34 | 31 | 31 | 30 | 29 | 31 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | SW 11 | SW 10 | SW 10 | SW 10 | S 9 | SW 9 | SW 9 | S 9 | SW 9 | SW 8 | SW 9 | SSW 9 | SSW 9 | WNW 6 | SSW 8 | SSW 8 | SSW 9 | SSW 8 | SSW 8 | SW 9 |
| kJ | 496 | 266 | 192 | 192 | 142 | 101 | 79 | 76 | 126 | 68 | 59 | 108 | 116 | 45 | 113 | 88 | 124 | 113 | 92 | 79 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 10 | S 10 | S 9 | SW 9 | S 9 | S 9 | N 9 | S 8 | S 8 | S 9 | N 7 | W 7 | SSW 9 | W 6 | W 6 | WNW 6 | E 6 | E 6 | S 9 |
| kJ | 274 | 254 | 192 | 140 | 103 | 106 | 71 | 24 | 35 | 49 | 55 | 16 | 15 | 116 | 28 | 30 | 11 | 25 | 17 | 24 |
Swell 3 Height (m) Direction Period (s) | W 10 | E 12 | E 12 | E 12 | ENE 12 | ENE 11 | W 8 | W 7 | N 8 | N 7 | N 8 | W 8 | N 6 | ENE 9 | E 6 | E 6 | ENE 10 | ENE 10 | ENE 10 | ENE 10 |
| kJ | 116 | 113 | 73 | 72 | 46 | 40 | 18 | 8 | 28 | 25 | 21 | 11 | 7 | 8 | 6 | 6 | 20 | 20 | 20 | 20 |
Wind waves Height (m) Direction Period (s) | E 7 | E 6 | E 6 | — | — | — | SW 3 | SW 8 | — | — | — | — | — | — | — | — | E 6 | — | — | ESE 6 |
| kJ | 52 | 24 | 19 | — | — | — | 2 | 84 | — | — | — | — | — | — | — | — | 15 | — | — | 24 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 14 | 59 | 66 | 14 | 10 | 10 | 10 | 10 | 10 | 0 | 14 | 25 | 14 | 14 | 10 | 14 |
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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