
Surf Forecasts:
Mainside surf forecast from 15 Jul 2026:
- Most powerful swell: Sunday 19 Jul, 9AM (local time) - 3ft (0.9m), 7s period, W swell with 82 kJ wave energy.
Best Forecast Surf Conditions for Mainside this week:
The most powerful waves expected at Mainside in the next 16 days are 0.9m 7s and forecast to arrive on Sunday (Jul 19) 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 1.2m 8s period and expected on Saturday (Jul 18) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9AM (Sun 19th Jul) | 3ft (0.9m) 7s |
Table - best surf conditions forecast for Mainside over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s coming up for Mainside.
First off, the water is sitting at 81°F at the start of the period, which is a bit colder than what we’d usually expect for this time of year, so maybe grab a slightly thicker springy if you’re sensitive to it.
Honestly, the outlook is pretty grim for the first week and a half. We’re staring down a long stretch of barely anything rideable. From Wednesday the 15th right through to the morning of Tuesday the 22nd, it’s just one poor surf call after another. Tiny swell, mostly under 3ft, with short, weak periods around 5 to 7 seconds. The wind is mostly cross or cross-onshore, and the wave energy is low – we’re talking values like 26 (weak) up to 89 (weak) on the 19th. Not worth getting wet.
Then there’s a little glimmer on the morning of Tuesday the 22nd – it’s glassy, but the swell is only 0.7ft. That’s a flat spell, not a session. The afternoon of Thursday the 23rd finally shows a pulse of 2ft swell from the west with a period of 8 seconds, and the wind is glassy that morning. The energy is still only 65 (weak), and the wave comment says “surfable waves but very ordinary conditions.” It’s a one-star rating at best, so it’s barely a paddler.
The real standout, and the only thing worth circling on the calendar, is the morning of Thursday the 30th of July. That’s a full 16 days away, so it’s a long-range promise, but it’s a big one. We’re looking at a 20ft swell from the north, with a period of 11 seconds. The wind is cross-offshore from the SSE at 37 mph, which is a gale-force breeze, but it’s clean. The combined energy is a massive 13743 (strong), but the wave comment still says “poor surf conditions.” That’s because the wind is howling, and that’s a serious problem. For a spot like Mainside, an exposed reef, that much north swell and that much wind is going to be a washing machine. This setup would be a lot more interesting for kite surfing than paddle surfing. It’s an expert-only look if you’ve got the balls and the gear, but honestly, for a standard surfer, it’s a pass.
The following afternoon, the 30th, drops to 13ft swell from the north with a 12-second period, but the wind is still a gale from the SSE at 40 mph. Clean but ballistic. Still not for the faint-hearted.
So, to wrap it up: there’s nothing worth your time until the 23rd, and even that’s a weak, ordinary day. The 30th has the size but not the conditions. A blank run like this is pretty normal for this area when the pattern is this stubborn.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Thu morning, min 27°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Sat afternoon, min 26°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
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) | SW 5 | WSW 5 | WSW 5 | WSW 5 | WSW 5 | WSW 9 | WSW 5 | E 10 | E 10 | W 7 | E 10 | E 10 | W 7 | W 7 | E 9 | E 10 | E 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 |
Wave Graph | |||||||||||||||||||||
19 | 19 | 17 | 27 | 26 | 0 | 39 | 8 | 8 | 34 | 8 | 7 | 82 | 61 | 7 | 7 | 7 | 8 | 8 | 8 | 9 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross-on | glassy | on | glassy |
High Tide | 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 | 12:03PM1.64m | 00:16AM1.86m | ||||||||
Low Tide | 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 | 6:06AM0.76m | 5:55PM0.91m | ||||||||
5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | 5:48 | — | — | |
— | 7:23 | — | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 27 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 29 | 29 | 30 | 32 | 32 | 30 | 30 | 31 | 30 | 30 | 31 | 31 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 10 | SW 10 | SW 10 | SW 10 | SW 9 | ESE 10 | SW 9 | E 10 | W 6 | W 7 | SE 8 | E 10 | W 7 | W 7 | WSW 8 | WSW 8 | WSW 8 | WSW 7 | WSW 7 | WSW 9 | WSW 8 |
79 | 77 | 60 | 58 | 42 | 19 | 38 | 8 | 7 | 34 | 3 | 7 | 82 | 61 | 110 | 98 | 98 | 54 | 47 | 99 | 58 | |
Swell 2 Height (m) Direction Period (s) | S 7 | ESE 11 | E 9 | E 9 | E 10 | S 9 | W 8 | SE 9 | SE 9 | SE 9 | E 10 | SE 8 | E 10 | E 10 | E 9 | E 10 | E 10 | SW 9 | SW 9 | ENE 9 | ENE 9 |
4 | 22 | 7 | 7 | 7 | 2 | 10 | 3 | 3 | 3 | 8 | 3 | 7 | 7 | 7 | 7 | 7 | 26 | 27 | 8 | 9 | |
Swell 3 Height (m) Direction Period (s) | E 9 | S 7 | S 8 | S 7 | S 7 | S 7 | E 10 | S 7 | E 10 | E 10 | E 14 | W 7 | SE 9 | SE 9 | SE 9 | SE 9 | SE 9 | ENE 9 | ENE 9 | SE 8 | S 7 |
7 | 10 | 4 | 4 | 4 | 1 | 8 | 1 | 8 | 8 | 4 | 1 | 3 | 3 | 3 | 3 | 3 | 8 | 8 | 3 | 1 | |
Wind waves Height (m) Direction Period (s) | SW 5 | WSW 5 | WSW 5 | WSW 5 | WSW 5 | WSW 9 | WSW 5 | WSW 6 | WSW 8 | SW 8 | WSW 7 | WSW 8 | SW 8 | SW 8 | SSW 2 | — | — | — | — | — | — |
19 | 19 | 17 | 27 | 26 | 124 | 39 | 75 | 133 | 133 | 148 | 123 | 93 | 109 | 1 | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 608 | 683 | 600 | 73 | 694 | 608 | 608 | 660 | 600 | 652 | 600 | 600 | 600 | 73 | 73 | 73 | 73 | 36 | 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.










