Surf Forecasts:
Mainside surf forecast from 11 Jul 2026:
- Most powerful swell: Sunday 12 Jul, 12PM (local time) - 4.5ft (1.3m), 11s period, W swell with 396 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 11s and forecast to arrive on Sunday (Jul 12) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 7.0m 16s period and expected on Saturday (Jul 11) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 12PM (Sun 12th Jul) | 4.5ft (1.3m) 11s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Right then, let's have a look at what's cookin' at Mainside. This is a solid, exposed reef break that’s consistent, but the forecast is a bit of a mixed bag over the next few weeks. The water temp is sittin' right around 84°, which is spot on for this time of year – no surprises there.
First up, this weekend and the start of next week are pretty much a write-off. From Saturday the 11th right through until the afternoon of Monday the 21st of July, it’s just one big gap of poor surf. We’ve got gale-force winds, very little to no swell, and just poor conditions all round. You won’t find me in the water, that’s for sure.
Things start to look a little more interesting on the afternoon of Monday the 21st. We get a little bump of 3 ft from the east with a short, choppy 7-second period. It’s clean with a moderate offshore breeze, but the combined energy is only 66, which is weak. It’s surfable, but nothing to get excited about.
The next few days after that are still small, but we’re getting a bit more consistency. Then, we've got one window that stands out. Friday the 24th of July. In the afternoon, the stars align at Mainside. We get a clean 3 ft east swell, but with a 10-second period that’ll give it a bit of shape. The wind will be glassy, which for a reef break like this is bloody perfect. The combined energy hits 200 (moderate), and the east swell is right in the groove for this spot. This is your standout session – it won't be huge, but it'll be clean and fun. Keep in mind, crowds can be a thing here sometimes.
The following Saturday and Sunday morning, the 25th and 26th, still offer some rideable waves, around 3 ft to 4 ft from the east, with clean conditions, but the period drops back to 7 or 8 seconds, making it a bit more disorganised. Not a bad option if you missed Friday, but Friday the 24th afternoon is the clear winner.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Sat morning. Warm (max 29°C on Sat afternoon, min 27°C on Sat morning). Winds decreasing (severe gales from the SE on Sat morning, moderate winds from the SSE by Mon night). | Days 4-6 Weather SummaryMostly dry. Warm (max 30°C on Tue morning, min 27°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | |||||||||||||||
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) | SSE 17 | S 16 | SSE 13 | W 12 | W 11 | W 10 | W 11 | W 9 | W 8 | E 9 | W 7 | E 9 | E 9 | SSW 8 | E 9 | E 10 | E 10 | SW 9 | E 10 | E 10 | E 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 390 | 389 | 125 | 21 | 23 | 10 | 7 | 4 | 6 | 7 | 0 | 7 | 7 | 7 | 0 | 7 | 7 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | 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-off | cross | cross-on | cross-off | glassy | cross | cross-off |
High Tide | 5:40PM1.76m | 4:38AM1.97m | 6:35PM1.88m | 5:35AM2.07m | 7:21PM1.97m | 6:27AM2.15m | 8:01PM2.04m | 7:16AM2.21m | 8:39PM2.07m | 8:02AM2.23m | 9:14PM2.08m | 8:47AM2.19m | 9:49PM2.07m | ||||||||
Low Tide | 10:45AM0.39m | 10:55PM1.17m | 11:45AM0.23m | 11:57PM1.12m | 12:36PM0.11m | 00:48AM1.04m | 1:22PM0.04m | 1:34AM0.95m | 2:05PM0.03m | 2:17AM0.87m | 2:46PM0.08m | 2:59AM0.79m | 3:25PM0.18m | ||||||||
 |  |  | |  |  |  | |  | | | | | | | | | | | | | |
 | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — |
 | — | 7:24 | — | — | 7:24 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:22 | — |
mm | 10 | 2 | 1 | 1 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 30 | 30 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 |
Feels °C | 18 | 22 | 25 | 29 | 29 | 29 | 29 | 30 | 30 | 33 | 32 | 31 | 32 | 32 | 32 | 34 | 33 | 33 | 34 | 33 | 32 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 13 | SW 12 | SW 12 | SW 10 | W 9 | W 9 | SW 9 | SW 10 | S 8 | S 8 | SW 10 | SSW 8 | SW 10 | SW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 9 |
| kJ | — | — | 1671 | 1379 | 687 | 234 | 38 | 23 | 26 | 23 | 140 | 137 | 24 | 98 | 120 | 181 | 138 | 141 | 135 | 91 | 79 |
Swell 2 Height (m) Direction Period (s) | — | — | SW 17 | W 12 | W 11 | W 10 | SW 9 | SW 9 | W 8 | W 7 | SW 10 | SW 10 | E 9 | SW 10 | S 8 | E 10 | E 10 | ESE 10 | E 10 | E 10 | E 10 |
| kJ | — | — | 175 | 390 | 389 | 125 | 40 | 20 | 10 | 4 | 23 | 35 | 7 | 34 | 44 | 7 | 7 | 18 | 7 | 7 | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SE 13 | W 11 | W 10 | E 9 | E 9 | W 7 | E 9 | SE 11 | ESE 11 | E 9 | SE 11 | SE 11 | ESE 10 | S 7 | SE 9 | W 6 |
| kJ | — | — | — | — | — | 7 | 21 | 8 | 7 | 7 | 4 | 6 | 5 | 22 | 7 | 4 | 4 | 9 | 3 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | SSE 17 | S 16 | SSE 13 | SSE 11 | SSE 11 | SSE 10 | S 9 | S 9 | S 9 | S 9 | — | — | SSW 8 | — | — | S 7 | — | S 2 | — | — | SE 2 |
| kJ | 41662 | 25127 | 4937 | 1751 | 954 | 603 | 495 | 359 | 264 | 214 | — | — | 116 | — | — | 52 | — | 1 | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 735 | 622 | 608 | 608 | 618 | 618 | 622 | 815 | 622 | 622 | 622 | 14 | 14 | 73 | 14 | 10 | 830 | 14 | 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.
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