
Surf Forecasts:
Mainside surf forecast from 7 Aug 2026:
- Most powerful swell: Sunday 9 Aug, 6PM (local time) - 10ft (3.0m), 13s period, W swell with 3,208 kJ wave energy.
Best Forecast Surf Conditions for Mainside this week:
The most powerful waves expected at Mainside in the next 16 days are 3.0m 13s and forecast to arrive on Sunday (Aug 09) 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 7.5m 12s period and expected on Saturday (Aug 08) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 6PM (Sun 9th Aug) | 10ft (3.0m) 13s |
Table - best surf conditions forecast for Mainside over the next 16 days.
The Lowdown
Alright, mates, Rusty here. Let’s be real with you. I’ve looked at the charts for our stretch of coast, and honestly, it’s a bit of a heartbreaker for the next couple of weeks. We’ve got one solid window of proper surf, but the rest is mostly flat or junk. Let’s walk through it.
The Long Wait and the One Good Window
For the first few days, it’s not even worth paddling out. Friday the 7th is a total mess with a severe gale blowing and a big, stormy 20ft swell that has no shape to it. That’s a full pass. Saturday and Sunday (the 8th and 9th) see the swell drop right out, leaving tiny 2ft dribblers with onshore breezes. Nothing doing. We’ve got a flat spell that runs right through the middle of the week, with a few days of barely-ankle-biters. It’s a proper lull, probably a 5-day gap with no real, rideable surf.
Then, Monday the 10th rolls around. This is our one true standout of the whole window. A new W/NW swell fills in overnight. The energy jumps up to a strong 1694 reading early Monday morning. We’re looking at a solid 7ft of swell on Monday morning with a 13-second period. That’s proper groundswell energy. The wind is a cross-offshore SSE breeze, but it’s only 25 mph, which will keep the surface reasonably clean. This is the day to go if you can. As the day goes on, it backs off a bit to 6ft in the afternoon, but it’s still workable. The water temp is sitting at 86° which is about a degree and a half warmer than the long-term average – not crazy, but you’ll notice it’s a touch balmy.
The Aftermath and More Flatness
Tuesday the 11th is a fade-out, back down to 3ft. After that, we are back to the desert. From the 12th through the 19th, there’s just nothing. We're looking at more than a week of dribble. The swell is under 3ft, and the winds are mostly light and cross-offshore, which would be great if there were any waves, but there aren't. The 16th has some long-period ENE swell at 12 seconds, but the height is only 1ft. It’s a tease. The energy readings are all in the low double-digits, which is about as weak as it gets.
The Light at the End, But It’s Faint
The week after, around the 20th and 21st, we do get some proper offshore winds from the ESE and E, which is a good sign, but the swell is basically non-existent. The 20th has a strong offshore breeze that will make for clean but completely unsurfable conditions. There’s talk of a tiny 2ft bump, but it’s not enough to get excited about. The only thing that might be interesting is if that offshore wind starts to groom some of the small lumps into a rideable shape, but it’s a gamble. There’s nothing on the charts to suggest it will get better before the end of the forecast period.
So, there you have it. One solid morning on Monday the 10th at Mainside, and then a whole lot of nothing. If you get the chance, be out there for dawn patrol Monday. Otherwise, it might be time to wax the fish and go for a paddle, or take up kite-surfing for the next week, because the onshore wind on some of those days will at least have some fun. The forecast can always change, so keep an eye on it.
Stay stoked,
Rusty
Short Range ForecastHeavy rain (total 193mm), heaviest during Fri night. Warm (max 29°C on Fri night, min 28°C on Fri afternoon). Winds decreasing (stormy winds from the S on Fri night, strong winds from the SSE by Mon morning). | Days 5-7 Weather SummaryHeavy rain (total 36mm), heaviest during Mon night. Warm (max 30°C on Wed morning, min 28°C on Mon night). Mainly fresh winds. | |||||||||||||||||||
Fri 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | ||||||||||||||
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) | NW 11 | N 10 | E 11 | ENE 10 | ENE 10 | E 10 | E 10 | W 13 | W 13 | W 12 | W 11 | W 9 | W 9 | W 8 | W 8 | W 8 | W 9 | W 9 | W 8 | W 7 |
Wave Graph | ||||||||||||||||||||
7332 | 441 | 62 | 136 | 102 | 48 | 47 | 2288 | 1510 | 776 | 317 | 134 | 102 | 86 | 66 | 30 | 40 | 55 | 49 | 25 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | on | cross | cross-off | cross-off | cross-off |
High Tide | 1:33AM1.83m | 4:33PM1.62m | 3:07AM1.83m | 5:46PM1.76m | 4:31AM1.92m | 6:33PM1.89m | 5:36AM2.05m | 7:10PM2.00m | 6:28AM2.16m | 7:43PM2.07m | 7:14AM2.24m | 8:13PM2.13m | ||||||||
Low Tide | 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 | 1:14PM0.15m | 1:25AM0.82m | 1:52PM0.15m | 2:03AM0.69m | |||||||
— | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | |
7:12 | — | — | 7:12 | — | — | 7:10 | — | — | 7:09 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | |
mm | 46 | 83 | 37 | 7 | 8 | 4 | 4 | 3 | 1 | 2 | 14 | 4 | 9 | 6 | — | — | — | 1 | — | 13 |
Temp °C | 28 | 29 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 29 | 29 | 30 | 28 |
Feels °C | 21 | 23 | 18 | 19 | 24 | 26 | 27 | 27 | 28 | 29 | 29 | 30 | 30 | 30 | 33 | 32 | 31 | 31 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | ENE 12 | N 10 | E 11 | ENE 10 | WSW 13 | WSW 14 | WSW 14 | W 13 | SW 12 | SW 12 | SW 12 | SW 11 | SW 11 | S 10 | SW 10 | SW 9 | SSW 9 | SSW 9 | SSW 9 | SSW 9 |
379 | 441 | 62 | 136 | 7434 | 6759 | 4425 | 2288 | 1348 | 1380 | 1627 | 861 | 743 | 210 | 213 | 141 | 305 | 203 | 168 | 217 | |
Swell 2 Height (m) Direction Period (s) | NNE 16 | NW 13 | NNE 9 | E 15 | ENE 10 | E 10 | E 10 | SW 12 | W 13 | W 12 | W 11 | W 9 | S 10 | W 8 | S 9 | S 9 | W 9 | W 9 | W 8 | W 7 |
177 | 82 | 16 | 17 | 102 | 48 | 47 | 1380 | 1510 | 776 | 317 | 134 | 340 | 86 | 140 | 137 | 40 | 55 | 49 | 25 | |
Swell 3 Height (m) Direction Period (s) | SE 13 | E 12 | — | — | ENE 15 | ENE 15 | E 15 | E 14 | E 14 | E 13 | E 13 | E 12 | W 9 | ENE 11 | W 8 | W 8 | N 9 | N 8 | N 7 | N 7 |
7 | 69 | — | — | 21 | 21 | 17 | 140 | 184 | 171 | 156 | 106 | 102 | 41 | 66 | 30 | 15 | 20 | 9 | 4 | |
Wind waves Height (m) Direction Period (s) | NW 11 | SSW 9 | SSW 12 | SSW 13 | SSE 10 | S 10 | S 12 | S 11 | SSE 12 | S 12 | S 12 | S 10 | S 10 | SW 10 | — | — | — | — | NNW 3 | N 4 |
7332 | 4739 | 12255 | 18536 | 3137 | 2318 | 3678 | 1612 | 995 | 894 | 456 | 522 | 908 | 560 | — | — | — | — | 3 | 2 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 735 | 735 | 735 | 735 | 735 | 735 | 622 | 608 | 600 | 600 | 600 | 622 | 621 | 29 | 24 | 27 | 39 | 10 | 10 | 10 |
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.











