
Surf Forecasts:
Mainside surf forecast from 14 Jul 2026:
- Most powerful swell: Saturday 18 Jul, 9AM (local time) - 4ft (1.2m), 6s period, SW swell with 89 kJ wave energy.
Best Forecast Surf Conditions for Mainside this week:
The most powerful waves expected at Mainside in the next 16 days are 1.2m 6s and forecast to arrive on Saturday (Jul 18) at 9AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 8s period and expected on Sunday (Jul 19) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9AM (Sat 18th Jul) | 4ft (1.2m) 6s |
Table - best surf conditions forecast for Mainside over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s have a look at what’s on the table for Mainside over the next couple weeks. Gotta be straight with you – it’s a pretty bleak run. We’ve got a long stretch of tiny, weak swell and a lot of onshore or cross-off wind that’s just not doing us any favours. The first recommendation doesn’t pop up until late in the period, so there’s a big gap of flat or near-flat, messy conditions to sit through.
Right now, through mid-July and all the way to the 26th, it’s a tough watch. We’re looking at swell heights mostly around 0.7ft to 2ft, with short, weak periods of 4–10 seconds and combined energy barely cracking two digits (mostly between 7 and 134, which is weak to moderate at best). Winds are cross-on or cross for the most part, with a few cleaner moments but nothing worth paddling out for. The brief glassy spell on the morning of the 22nd (Wednesday) has only a 0.7ft, 11-second easterly swell – it’s clean, but there’s just no push. Not worth getting wet for.
Now, things start to get interesting around the 27th of July. That Monday morning, we finally see a pulse. A 16-second, very long period easterly groundswell pushes in at 2ft, with combined energy climbing to 118 (moderate). Winds are offshore from the ENE, keeping it clean. This is a proper long-period groundswell, so Mainside (a reef setup) should handle it well – those long gaps between sets will make paddling out easier, and the shape should be better than any of the junk we’ve seen. The catch? At only 2ft, it’s tiny, so you’ll need a bigger board and low expectations. Still, this is the best on offer. The afternoon gets stronger in energy (170) but the wind turns cross and picks up, so that morning window is the one.
Then the 28th (Tuesday) and 29th (Wednesday) see the swell building. Tuesday morning has 3ft of 16-second easterly energy at 310 (strong combined energy), but a fresh northerly cross-wind at 22 mph will make it lumpy – only for the keen and experienced. Wednesday the 29th is a weird one: we get a massive spike in energy with 839 and 935 (very strong), from a 17-second easterly groundswell at 4ft to 4ft. But the wind? We’re talking hurricane-force and severe gale from the SSE, with moderate rain. The waves are clean offshore but the wind speeds of 78 mph and 47 mph are absolutely not for surfing – this is kite territory or a total stay-home day. For experts only if they’re mental enough.
So, the standout is the morning of the 27th of July (Monday) – a clean, long-period, 2ft easterly groundswell with light offshore winds. It’s tiny, but it’s the cleanest, most promising window in a sea of poor surf. After that, the big energy on the 29th is too dangerous to recommend for paddle surfing.
There’s a massive gap from now until the 27th with no real surf. That’s nearly two weeks of waiting. But hey, this area can turn around quick – forecasts change.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 28°C on Tue morning, min 27°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Fri morning, min 26°C on Sun night). Mainly fresh winds. | ||||||||||||||||||||
Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | |||||||||||||||
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) | E 9 | E 9 | SW 9 | SW 5 | WSW 5 | E 10 | WSW 4 | E 9 | E 10 | E 10 | WSW 6 | W 7 | SW 6 | W 7 | W 7 | W 8 | E 10 | E 9 | E 9 | E 10 | E 9 |
Wave Graph | |||||||||||||||||||||
7 | 6 | 0 | 17 | 15 | 7 | 18 | 7 | 7 | 8 | 55 | 9 | 89 | 37 | 8 | 29 | 7 | 7 | 7 | 7 | 7 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross-off | cross | cross-on | cross-off |
High Tide | 8:01PM2.04m | 7:16AM2.21m | 8:39PM2.07m | 8:02AM2.23m | 9:14PM2.08m | 8:47AM2.19m | 9:49PM2.07m | 9:32AM2.11m | 10:23PM2.04m | 10:17AM1.97m | 10:58PM1.99m | 11:06AM1.81m | 11:36PM1.93m | ||||||||
Low Tide | 1:22PM0.04m | 1:34AM0.95m | 2:05PM0.03m | 2:17AM0.87m | 2:46PM0.08m | 2:59AM0.79m | 3:25PM0.18m | 3:41AM0.75m | 4:02PM0.33m | 4:25AM0.73m | 4:39PM0.51m | 5:13AM0.73m | 5:16PM0.71m | ||||||||
5:43 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | |
— | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 27 | 27 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 31 | 31 | 30 | 29 | 31 | 31 | 31 | 31 | 32 | 30 | 30 | 29 | 30 | 30 | 31 | 30 | 30 | 31 | 31 | 30 | 32 |
Swell 1 Height (m) Direction Period (s) | SSW 8 | S 8 | SW 9 | SW 10 | SW 10 | E 10 | SW 10 | E 9 | E 10 | W 8 | W 6 | W 7 | W 7 | W 7 | W 7 | W 8 | WSW 8 | SW 8 | SW 8 | SW 9 | SW 9 |
122 | 68 | 83 | 79 | 77 | 7 | 60 | 7 | 7 | 5 | 13 | 9 | 37 | 37 | 8 | 29 | 99 | 147 | 108 | 132 | 107 | |
Swell 2 Height (m) Direction Period (s) | SW 9 | SW 10 | S 8 | S 7 | ESE 11 | SSW 10 | E 9 | S 7 | SW 9 | E 10 | SW 9 | ESE 9 | SE 9 | E 10 | W 9 | E 10 | E 10 | E 9 | E 9 | WSW 8 | E 9 |
31 | 76 | 35 | 4 | 22 | 9 | 7 | 4 | 3 | 8 | 19 | 8 | 3 | 7 | 6 | 7 | 7 | 7 | 7 | 21 | 7 | |
Swell 3 Height (m) Direction Period (s) | E 9 | E 9 | S 8 | E 9 | S 7 | S 8 | SSW 9 | SE 10 | SE 10 | SE 9 | E 10 | E 10 | E 10 | SE 8 | E 10 | SE 9 | SE 9 | SE 9 | SE 9 | E 10 | SE 8 |
7 | 6 | 10 | 7 | 10 | 4 | 8 | 4 | 4 | 3 | 8 | 8 | 8 | 3 | 7 | 3 | 3 | 3 | 3 | 7 | 3 | |
Wind waves Height (m) Direction Period (s) | — | — | — | SW 5 | WSW 5 | SW 10 | WSW 4 | WSW 9 | SW 9 | WSW 9 | WSW 6 | SW 7 | SW 6 | SW 8 | SW 8 | SW 8 | SSW 8 | S 7 | S 4 | — | — |
— | — | — | 17 | 15 | 115 | 18 | 110 | 81 | 132 | 55 | 116 | 89 | 138 | 147 | 201 | 92 | 1 | 11 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 14 | 73 | 73 | 600 | 600 | 608 | 608 | 694 | 608 | 678 | 600 | 73 | 652 | 600 | 59 | 59 | 73 | 14 | 652 | 73 | 14 |
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.










