
Surf Forecasts:
Mainside surf forecast from 5 Aug 2026:
- Best quality surf: Friday 7 Aug, 6AM (local time) - 13ft (4.0m), 17s period, E swell with cross-onshore winds.
- Most powerful swell: Friday 7 Aug, 3PM (local time) - 38ft (11.5m), 13s period, N swell with 44,292 kJ wave energy.
- Next surfable swell (1★+): Friday 7 Aug, 6AM (local time) - 13ft (4.0m), 17s 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 Friday (Aug 07) at 6AM. The primary swell is predicted to be 4.0m and 17s period with a secondary swell of 6.0m and 11s. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Mainside in the next 16 days are 11.5m 13s and forecast to arrive on Friday (Aug 07) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 12.5m 14s period and expected on Saturday (Aug 08) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Fri 7th Aug) | 13ft (4.0m) 17s |
| Best Surf | 6AM (Fri 7th Aug) | 13ft (4.0m) 17s |
| Most Powerful | 3PM (Fri 7th Aug) | 38ft (11.5m) 13s |
Table - best surf conditions forecast for Mainside over the next 16 days.
The Lowdown
Alright, let’s get into it. This is Mainside, and honestly, for the next 16 days, we are looking at a pretty wild ride that mostly ends up with a whole lot of nothing. The short version? The next week is a complete write-off thanks to a couple of rogue swells and hurricane-force winds, and then it just... fades away. There isn't a single standout session in this whole window. Not one. That hurts to say.
The first real drama kicks off on Friday the 7th. We've got a monster swell rolling in, pushing 26.2ft on Friday morning, coming from the N. The energy reading is massive at 24665, but this thing is way too big for Mainside, and with storm-force winds howling cross-onshore, it's just a mess. I wouldn't even look at the water. It just gets worse into the afternoon, with the swell jumping to 37.7ft as the wind ramps up to hurricane-force. That's not surfing, that's a survival mission. The combined energy is off the charts at 49114, but it's all for nothing if you want a wave to yourself.
The wind stays insane through Saturday the 8th, but the swell drops off a cliff. We're looking at 1.3ft for the morning and then basically flat by the afternoon. The energy has completely vanished, down to 68 then zero. It's clean, but there's nothing to ride. You could probably kite-surf on that cross-off wind, but for a paddle surfer, it's a dead loss.
Sunday the 9th is more of the same. Tiny 0.7ft to 1ft slop, clean but completely gutless. The energy is down in the teens and thirties. You’re better off staying in bed. The ocean is just catching its breath.
Then things get weird again. On Monday the 10th, a new W swell pulses in, hitting 13.1ft in the morning. The energy jumps back up to 5531. It's clean with a cross-off wind, which is a huge positive, but this is still bombing. It's right on the edge of being too big for most, and it's definitely not a beginner wave. It comes back down to 9.8ft in the afternoon but remains a hefty, powerful west swell. This is the closest we get to something interesting, but the quality just isn't there for a spot like this.
From Tuesday the 11th onwards, it's a slow, sad fade-out. We get a 5.6ft W swell on Tuesday morning but it's lumpy with a cross-shore wind, and then it just keeps dropping. The energy levels go from 541 down to the low hundreds and then into the tens. The rest of that week and into the next just has these tiny windswells, mostly under 3.3ft, with periods all over the place. The water temp is about average for this time of year, so no surprises there, but there's nothing to test it on.
Even the glimpses of offshore wind, like on Monday the 17th afternoon, only bring a pathetic 1ft of swell. There is a slight pulse on Tuesday the 18th, with 3.3ft E swell, but the period is a short 7 seconds and it's ordinary at best. The energy is under 100. It’s just not worth the paddle out.
So, here’s the deal. We have a 16-day window with one giant, unusable swell and a whole lot of flatness. This is one of those stretches where the ocean is just saying “no.” It tends not to stay this poor for long, and forecasts can change, so keep an eye on the charts. But right now, there is absolutely nothing on offer at Mainside. You might see some kite surfers out when the wind pipes up, especially on that Saturday, because the clean, strong cross-off winds are perfect for them. But for us, it's a long, dry spell.
Take it easy.
Short Range ForecastHeavy rain (total 437mm), heaviest during Sat afternoon. Warm (max 30°C on Thu morning, min 28°C on Thu night). Mainly extremely windy. | Days 5-7 Weather SummaryHeavy rain (total 173mm), heaviest during Sat night. Warm (max 30°C on Sun night, min 28°C on Sat night). Winds decreasing (extremely windy from the S on Sat night, moderate winds from the SW by Tue afternoon). | ||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | ||||||||||||||
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) | E 17 | E 16 | E 17 | E 17 | N 11 | N 13 | NNW 12 | NNE 14 | S 15 | ENE 15 | E 15 | E 14 | W 15 | W 13 | W 12 | W 11 | W 10 | W 9 | W 9 |
Wave Graph | |||||||||||||||||||
3380 | 3798 | 5451 | 7199 | 16311 | 44292 | 5092 | 68 | 0 | 43 | 17 | 37 | 12423 | 5387 | 2806 | 1300 | 541 | 383 | 235 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-off |
High Tide | 11:29PM1.96m | 12:40PM1.64m | 00:20AM1.89m | 2:33PM1.55m | 1:33AM1.83m | 4:33PM1.62m | 3:07AM1.83m | 5:46PM1.76m | 4:31AM1.92m | 6:33PM1.89m | 5:36AM2.05m | 7:10PM2.00m | |||||||
Low Tide | 6:17AM0.64m | 6:08PM1.08m | 7:37AM0.65m | 7:25PM1.25m | 9:12AM0.60m | 9:22PM1.33m | 10:37AM0.47m | 10:58PM1.26m | 11:41AM0.32m | 11:59PM1.13m | 12:31PM0.21m | 00:45AM0.97m | |||||||
— | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — | |
7:14 | — | 7:13 | — | — | 7:12 | — | — | 7:12 | — | — | 7:10 | — | — | 7:09 | — | — | 7:08 | — | |
mm | 1 | — | — | 16 | 35 | 133 | 18 | 78 | 156 | 139 | 15 | 5 | 9 | 1 | — | 4 | — | — | — |
Temp °C | 29 | 30 | 30 | 29 | 28 | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
Feels °C | 31 | 28 | 27 | 24 | 16 | 17 | 32 | 11 | 8 | 15 | 19 | 20 | 23 | 27 | 28 | 30 | 31 | 32 | 34 |
Swell 1 Height (m) Direction Period (s) | E 17 | E 16 | E 17 | E 17 | ENE 16 | ENE 14 | NNW 12 | NNE 14 | — | ENE 15 | WSW 15 | WSW 15 | W 15 | W 13 | W 12 | W 11 | SW 11 | SW 11 | SW 11 |
3380 | 3798 | 5451 | 7199 | 8354 | 4822 | 5092 | 68 | — | 43 | 7670 | 16446 | 12423 | 5387 | 2806 | 1300 | 1019 | 589 | 496 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | SSW 9 | — | — | — | E 15 | E 14 | E 14 | E 14 | E 13 | E 13 | W 10 | S 10 | W 9 |
— | — | — | — | — | — | 216 | — | — | — | 17 | 37 | 96 | 144 | 130 | 121 | 541 | 461 | 235 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SE 14 | — | — | — | — | — | — | — | — | SW 12 | S 11 | W 9 | S 11 |
— | — | — | — | — | — | 418 | — | — | — | — | — | — | — | — | 120 | 556 | 383 | 269 | |
Wind waves Height (m) Direction Period (s) | NNE 6 | NNE 7 | NNE 8 | N 10 | N 11 | N 13 | SE 11 | S 12 | S 15 | SSW 15 | SW 15 | S 12 | S 12 | SSW 12 | SSW 12 | SSW 12 | — | — | — |
90 | 307 | 849 | 3457 | 16311 | 44292 | 831 | 26585 | 63895 | 45977 | 31354 | 7062 | 4698 | 3675 | 3126 | 2582 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 608 | 796 | 796 | 608 | 1330 | 758 | 735 | 758 | 735 | 735 | 735 | 735 | 735 | 618 | 600 | 600 | 600 | 600 | 600 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
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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.











