
Surf Forecasts:
Mainside surf forecast from 7 Jul 2026:
- Most powerful swell: Sunday 12 Jul, 6AM (local time) - 4.5ft (1.3m), 12s period, W swell with 522 kJ wave energy.
Best Forecast Surf Conditions for Mainside this week:
The most powerful waves expected at Mainside in the next 16 days are 1.3m 12s and forecast to arrive on Sunday (Jul 12) at 6AM. Winds are predicted to be cross-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 Friday (Jul 10) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 6AM (Sun 12th Jul) | 4.5ft (1.3m) 12s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, Rusty here. Let’s be straight with you. For Mainside, a reef break that’s consistent and exposed to the north, the next week and a half is pretty much a write-off for a decent paddle. We have a long, frustrating gap right out the gate.
Right from Tuesday the 7th, we’re looking at tiny, weak, and mostly messy conditions. That morning you’ve got a 2ft cross-swell from the west at a short period of 6 seconds with a cross wind. Not worth getting wet for. This low-energy, poor-quality pattern hangs around right through the following week up to July 16th. There’s a big gap here with nothing to recommend.
A lot of that week, from Thursday the 9th into the early part of the following week, is dominated by strong, stormy offshore winds, gusting from gale force at times, with zero swell. You’d be mad to be out there. Even on Sunday the 12th, when a 4ft west swell with a long period of 12 seconds shows up, the energy reading hits 416, but the poor surf conditions and fresh cross-off wind keep it from being any good.
We finally see a glimmer of life on Saturday the 18th. That morning offers the best window in the whole 16-day outlook. A 4ft easterly swell with a period of 10 seconds rolls in, giving us a moderate level of energy (256). The wind is a light breeze from the south, which is a clean cross-off. It’s not pumping, but it’s the most surfable it’s gonna get. The afternoon cleans up even more with a 4ft easterly swell swinging to a longer 11-second period, energy climbing to 350, with a gentle southeast breeze keeping it clean. This is the standout. It’s not a huge swell, but it’s clean and has some push. For a consistent spot like this, you take the window when it comes.
The water temp is lounging around 83°, which is about normal for this time of year, so you won’t need a spring suit.
Beyond that promising Saturday, the following Sunday morning still holds a 3ft swell with offshore wind, but the energy drops back to 176, and the quality fades out as we head into the final days. This is a true bust of a forecast, but forecasts can and do change. Keep an eye on the 18th – it’s our best and maybe only shot.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Thu morning. Warm (max 29°C on Thu morning, min 26°C on Tue night). Winds increasing (light winds from the NNW on Tue afternoon, near gales from the E by Thu night). | Days 4-6 Weather SummaryHeavy rain (total 88mm), heaviest during Sun night. Warm (max 29°C on Fri morning, min 27°C on Sun night). Winds decreasing (gales from the ESE on Fri night, fresh winds from the SSE by Sun afternoon). | ||||||||||||||||||||
Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | |||||||||||||||
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 6 | W 7 | W 6 | WNW 6 | NW 7 | SE 16 | SE 16 | SE 16 | SE 18 | SSE 18 | SE 18 | SSE 17 | SSE 14 | SW 15 | SW 14 | W 12 | W 11 | W 9 | W 10 | W 8 | E 9 |
Wave Graph | |||||||||||||||||||||
17 | 14 | 10 | 14 | 25 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 416 | 220 | 39 | 30 | 12 | 6 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off |
High Tide | 11:48AM1.72m | 00:24AM1.86m | 1:09PM1.62m | 1:19AM1.84m | 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 | ||||||||
Low Tide | 5:59PM0.76m | 6:59AM0.76m | 6:58PM0.94m | 8:16AM0.67m | 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 | ||||||||
5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | |
— | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:23 | — | |
mm | — | — | — | — | — | — | 2 | 1 | — | 2 | 6 | 7 | 2 | 2 | 8 | 15 | 14 | 32 | 11 | 4 | 16 |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 27 | 27 | 27 |
Feels °C | 31 | 31 | 31 | 29 | 29 | 30 | 29 | 29 | 28 | 25 | 23 | 22 | 24 | 26 | 28 | 30 | 29 | 29 | 28 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | ESE 13 | ESE 16 | ESE 17 | ESE 16 | ESE 16 | SE 16 | SE 16 | SE 16 | SE 18 | SE 18 | — | — | SSW 16 | SW 15 | SW 14 | SW 12 | SW 11 | S 10 | SW 9 | SW 9 | S 9 |
198 | 519 | 848 | 1229 | 1877 | 3067 | 3761 | 4643 | 9109 | 20787 | — | — | 7418 | 5944 | 3466 | 1042 | 382 | 371 | 68 | 41 | 230 | |
Swell 2 Height (m) Direction Period (s) | W 6 | W 7 | W 6 | WNW 6 | — | — | — | — | S 18 | — | — | — | — | — | — | W 12 | W 11 | SW 10 | W 10 | W 8 | SW 10 |
17 | 14 | 10 | 14 | — | — | — | — | 2871 | — | — | — | — | — | — | 416 | 220 | 117 | 30 | 12 | 35 | |
Swell 3 Height (m) Direction Period (s) | ESE 18 | SW 8 | SSW 8 | SE 17 | — | — | — | — | — | — | — | — | — | — | — | — | — | W 9 | SE 13 | E 9 | E 9 |
120 | 11 | 7 | 73 | — | — | — | — | — | — | — | — | — | — | — | — | — | 39 | 7 | 7 | 6 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NW 7 | — | NE 4 | — | — | SSE 18 | SE 18 | SSE 17 | SSE 14 | SSE 13 | SSE 11 | SSE 11 | SSE 11 | SE 5 | SSE 9 | SSE 9 | SE 7 |
— | — | — | — | 25 | — | 21 | — | — | 38047 | 25020 | 31641 | 13020 | 5591 | 1909 | 1113 | 961 | 76 | 586 | 528 | 54 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 15 | 15 | 10 | 10 | 10 | 10 | 796 | 608 | 608 | 736 | 736 | 736 | 736 | 618 | 618 | 618 | 622 | 600 | 650 | 600 | 622 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.










