Surf Forecasts:
Mainside surf forecast from 9 Jul 2026:
- Most powerful swell: Friday 10 Jul, 6PM (local time) - 13ft (4.0m), 10s period, E swell with 2,812 kJ wave energy.
Best Forecast Surf Conditions for Mainside this week:
The most powerful waves expected at Mainside in the next 16 days are 4.0m 10s and forecast to arrive on Friday (Jul 10) at 6PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 7.5m 18s period and expected on Saturday (Jul 11) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 6PM (Fri 10th Jul) | 13ft (4.0m) 10s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Alright, Rusty here. Let's have a look at what we're dealing with.
Well, I gotta be straight with you – the next week and a half is a write-off for any kind of decent surf. We're looking at a long, flat spell starting now and running right through until the morning of Saturday the 18th of July. Nothing but tiny, weak dribbles or just total flatness. It’s gonna be a real test of patience.
Finally, there’s a flicker of life on the morning of Saturday the 19th of July, but it's weak. The real action doesn't start kicking until the morning of Monday the 20th of July.
That's where we get our only real standout. Mainside is your spot. The swell picks up to a solid 3 ft coming out of the E, growing to 4 ft by the afternoon. What makes this special is the period – a solid 14 seconds, which means proper groundswell energy and long, lined-up sets. The wind is looking like moderate offshore from the SE, so the face should be clean. The combined energy is strong at 390 on Monday morning, ramping up to a very strong 577 for the afternoon. This session is definitely the best on offer for the whole forecast.
The morning of Tuesday the 21st of July is almost as good, with 5 ft of ENE swell and that same 14-second period, holding strong energy at 844. The offshore breeze holds, so it'll still be clean, though maybe a touch windier. By Tuesday afternoon, things start to get a bit messier with a cross-offshore wind.
After that, it gets a bit bumpy and inconsistent through the 22nd, with a different swell direction that might not be as clean. The water temperature at Mainside is sitting at 84°F, which is basically average for the time of year – no surprises there.
So, to sum it up: don't bother paddling out until the 20th. If you can wait, Monday the 20th of July and Tuesday morning the 21st are your best bets for catching some clean, long-period groundswell at Mainside. Keep your eyes on that forecast.
Rusty.
Short Range ForecastHeavy rain (total 26mm), heaviest during Fri night. Warm (max 30°C on Thu morning, min 28°C on Thu night). Winds increasing (fresh winds from the ENE on Thu morning, gales from the E by Fri night). | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Sun morning. Warm (max 30°C on Mon morning, min 28°C on Mon night). Winds decreasing (fresh winds from the SSE on Sun morning, calm by Tue night). | ||||||||||||||||||||
Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | |||||||||||||||
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) | SE 16 | SE 16 | SE 17 | SE 18 | E 9 | SSE 18 | S 18 | SSE 16 | SW 15 | SW 13 | S 11 | W 10 | SSE 10 | W 9 | S 9 | E 9 | E 9 | E 9 | E 9 | E 9 | E 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 1935 | 0 | 0 | 0 | 0 | 0 | 0 | 100 | 0 | 28 | 0 | 6 | 6 | 6 | 6 | 6 | 16 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | glassy | glassy |
High Tide | 2:50PM1.59m | 2:25AM1.85m | 4:27PM1.65m | 3:33AM1.89m | 5:40PM1.76m | 4:38AM1.97m | 6:35PM1.88m | 5:35AM2.07m | 7:21PM1.97m | 6:27AM2.15m | 8:01PM2.04m | 7:16AM2.21m | 8:39PM2.07m | ||||||||
Low Tide | 8:13PM1.08m | 9:35AM0.55m | 9:38PM1.16m | 10:45AM0.39m | 10:55PM1.17m | 11:45AM0.23m | 11:57PM1.12m | 12:36PM0.11m | 00:48AM1.04m | 1:22PM0.04m | 1:34AM0.95m | 2:05PM0.03m | 2:17AM0.87m | ||||||||
 | |  |  | | | | |  | | |  | | | |  | | | | | | |
 | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — |
 | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — |
mm | — | — | 1 | 3 | 3 | 11 | 4 | 4 | — | 1 | 1 | — | — | — | 1 | — | 1 | — | — | — | — |
Temp °C | 30 | 30 | 29 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 28 | 30 | 30 | 28 | 29 | 29 | 29 |
Feels °C | 30 | 30 | 28 | 23 | 22 | 21 | 22 | 25 | 26 | 29 | 29 | 31 | 32 | 32 | 31 | 34 | 34 | 32 | 33 | 33 | 34 |
Swell 1 Height (m) Direction Period (s) | SE 16 | SE 16 | S 18 | SE 18 | SSE 18 | — | — | SW 17 | SW 15 | SW 13 | SW 12 | SW 11 | SSE 10 | S 9 | S 9 | S 8 | S 8 | S 8 | SW 10 | SW 10 | SW 10 |
| kJ | 4295 | 6334 | 2744 | 16929 | 15038 | — | — | 6261 | 6817 | 2310 | 895 | 332 | 288 | 234 | 127 | 89 | 86 | 46 | 63 | 49 | 69 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | E 8 | W 10 | SW 10 | SW 10 | SW 9 | SW 10 | SW 10 | SW 10 | S 8 | S 8 | S 8 |
| kJ | — | — | — | — | — | — | — | — | — | — | 29 | 100 | 133 | 77 | 41 | 47 | 47 | 64 | 29 | 18 | 10 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SE 13 | W 10 | W 9 | ESE 6 | E 9 | E 9 | E 9 | E 9 | E 9 | E 10 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 7 | 46 | 28 | 7 | 6 | 6 | 6 | 6 | 6 | 16 |
Wind waves Height (m) Direction Period (s) | — | — | SE 17 | — | E 9 | SSE 18 | S 18 | SSE 16 | SSE 13 | SSE 12 | S 11 | SSE 10 | SSE 4 | ESE 6 | SE 3 | SE 3 | — | — | — | — | — |
| kJ | — | — | 7297 | — | 1935 | 34195 | 36571 | 14137 | 3440 | 1517 | 1068 | 562 | 7 | 13 | 2 | 2 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 650 | 865 | 608 | 736 | 1014 | 736 | 736 | 995 | 618 | 618 | 618 | 618 | 677 | 618 | 10 | 14 | 14 | 14 | 10 | 10 | 10 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
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.
Nearest