Surf Forecasts:
Mainside surf forecast from 20 Jul 2026:
- Most powerful swell: Tuesday 21 Jul, 6AM (local time) - 1.5ft (0.5m), 8s period, W swell with 33 kJ wave energy.
Best Forecast Surf Conditions for Mainside this week:
The most powerful waves expected at Mainside in the next 16 days are 0.5m 8s and forecast to arrive on Tuesday (Jul 21) at 6AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.4m 14s period and expected on Monday (Jul 27) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 6AM (Tue 21st Jul) | 1.5ft (0.5m) 8s |
Table - best surf conditions forecast for Mainside over the next 16 days.
The Lowdown
Alright, this is Rusty. Let’s look at the outlook for Mainside.
Honestly, the next couple of weeks are a tough stretch. We’re looking at a long, flat spell to kick things off. From today through the end of July, there’s basically nothing doing. We’re talking tiny, messy swell with cross-onshore winds keeping things choppy and poor. You’d be wasting your time paddling out. It’s a solid 11-day gap of just poor surf conditions.
The one true standout happens on Saturday, the 1st of August. Mainside finally wakes up with a west swell pushing through at 2ft. The wind swings to a light offshore from the ENE, cleaning it right up. You’ll get clean waves. The combined swell energy is moderate at 126, so there’s some real push for a change. The swell period is a solid 11 seconds, meaning decent groundswell shape. This is the best on offer by a long shot.
After that, we slip back into small, inconsistent surf through the first week of August. There’s a bit of windswell mixing in, and the wind stays mostly offshore, but the heights barely reach waist-high if you’re lucky. The wave energy stays weak to moderate, maxing out at 76. Nothing to write home about.
For the whole period, the water temperature is sitting at 83°, which is just about bang on average for this time of year, so don’t stress about the rubber.
So, if you’re hanging for a surf, pencil in that Saturday the 1st of August. It’s your only real shot at half-decent waves.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Mon afternoon, min 27°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Fri morning. Warm (max 29°C on Thu afternoon, min 27°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | ||||||||||||||
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) | W 7 | W 6 | W 8 | W 7 | ENE 9 | E 9 | E 9 | W 6 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | SSE 10 | W 7 | ENE 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 34 | 12 | 30 | 25 | 16 | 15 | 15 | 7 | 20 | 20 | 9 | 19 | 9 | 9 | 9 | 8 | 8 | 0 | 1 | 25 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross | cross | cross-on | cross-off | cross | cross-on | off | cross-off | cross | off | off | off | off | off | off | off |
High Tide | 11:36PM1.93m | 12:03PM1.64m | 00:16AM1.86m | 1:20PM1.50m | 1:05AM1.79m | 3:13PM1.44m | 2:07AM1.74m | 5:07PM1.50m | 3:20AM1.72m | 6:11PM1.60m | 4:25AM1.74m | 6:48PM1.70m | ||||||||
Low Tide | 5:16PM0.71m | 6:06AM0.76m | 5:55PM0.91m | 7:09AM0.79m | 6:40PM1.09m | 8:26AM0.79m | 7:46PM1.24m | 9:49AM0.75m | 9:28PM1.33m | 10:56AM0.66m | 11:01PM1.33m | 11:46AM0.56m | 11:59PM1.28m | |||||||
 |  | | | | | | | | | |  |  | | | | | | |  | |
 | — | — | 5:48 | — | — | 5:48 | — | — | 5:48 | — | — | 5:48 | — | — | 5:50 | — | — | 5:50 | — | — |
 | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — | — | 7:20 | — | — | 7:20 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | 2 | 2 | 2 |
Temp °C | 29 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 28 | 29 | 28 | 28 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 27 |
Feels °C | 32 | 32 | 31 | 31 | 32 | 32 | 32 | 33 | 32 | 33 | 33 | 32 | 33 | 32 | 32 | 31 | 30 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | W 7 | SW 7 | W 8 | W 7 | W 6 | SW 6 | SW 6 | W 6 | W 6 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | SSE 8 | SSE 8 | SSE 10 | SSE 10 | SSE 11 | E 9 |
| kJ | 34 | 29 | 30 | 25 | 13 | 19 | 19 | 7 | 6 | 20 | 9 | 19 | 9 | 9 | 7 | 26 | 216 | 272 | 412 | 6 |
Swell 2 Height (m) Direction Period (s) | E 10 | W 6 | SW 7 | SW 7 | SW 6 | W 6 | E 9 | SW 6 | ENE 10 | SW 7 | W 6 | W 5 | W 5 | W 6 | ENE 10 | ENE 9 | ENE 9 | SE 15 | W 7 | ENE 9 |
| kJ | 7 | 12 | 23 | 17 | 14 | 7 | 15 | 5 | 20 | 8 | 3 | 5 | 4 | 3 | 9 | 8 | 8 | 9 | 1 | 25 |
Swell 3 Height (m) Direction Period (s) | SE 9 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | E 9 | W 6 | ENE 8 | SW 7 | W 6 | SW 6 | SE 9 | SE 9 | SE 11 | W 5 | SE 10 | SW 7 | SW 7 | — | — |
| kJ | 3 | 9 | 8 | 16 | 16 | 15 | 6 | 7 | 8 | 2 | 1 | 3 | 3 | 5 | 2 | 4 | 2 | 2 | — | — |
Wind waves Height (m) Direction Period (s) | SW 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | E 4 | — | E 3 | E 4 | E 4 | SSE 12 |
| kJ | 47 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 5 | 20 | 30 | 1022 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 59 | 73 | 36 | 73 | 73 | 59 | 41 | 59 | 36 | 25 | 25 | 59 | 59 | 652 | 652 | 14 | 14 | 14 | 14 | 14 |
Best forecast wave conditions in Okinawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Mainside surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest