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Surf Forecasts:
Mainside surfForecast / Okinawa / Japan
16 Day Weather and Surf, issued 8 pm Monday 11 May 2026 JSTForecast update in hr min s Forecast update imminent
Mainside surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Mainside sea temperature is
23.9° C
(Which is 1.3°C colder than average for this time of year)Best Forecast Surf Conditions for Mainside this week:
The surf forecast for Mainside over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (May 12) at 12AM. The primary swell is predicted to be 0.7m and 9s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Mainside in the next 16 days are 1.5m 9s and forecast to arrive on Saturday (May 16) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 9s period and expected on Tuesday (May 12) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 12th May) | 2.5ft (0.7m) 9s |
| Best Surf | 9PM (Sun 17th May) | 4ft (1.2m) 9s |
| Most Powerful | 9PM (Sat 16th May) | 5ft (1.5m) 9s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 10mm), heaviest on Tue morning. Warm (max 24°C on Tue afternoon, min 21°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Fri morning, min 22°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 12 | Wednesday 13 | Thursday 14 | Friday 15 | Saturday 16 | Sunday 17 | Mon 18 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
E 9 | ESE 9 | ESE 9 | ESE 9 | ESE 10 | ESE 10 | E 10 | E 10 | ENE 9 | E 9 | ESE 9 | E 5 | E 7 | E 5 | E 9 | ENE 10 | ENE 9 | ESE 9 | NNE 5 | E 9 | E 9 | |
81 | 0 | 0 | 0 | 0 | 0 | 65 | 65 | 16 | 0 | 0 | 0 | 200 | 0 | 290 | 9 | 16 | 0 | 9 | 122 | 106 | |
Wind (km/h) | |||||||||||||||||||||
off | off | glassy | off | cross-off | cross | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | glassy | cross-on | |
High Tide | 3:42AM1.65m | 3:58PM1.57m | 4:25AM1.75m | 4:59PM1.72m | 5:03AM1.86m | 5:51PM1.85m | 5:39AM1.95m | 6:38PM1.95m | 6:15AM2.03m | 7:23PM2.00m | 6:52AM2.09m | 8:08PM1.99m | 7:29AM2.11m | ||||||||
Low Tide | 9:01PM0.64m | 9:58AM0.75m | 10:05PM0.63m | 10:47AM0.52m | 10:58PM0.62m | 11:29AM0.31m | 11:44PM0.63m | 12:11PM0.12m | 00:26AM0.66m | 12:52PM-0.03m | 1:06AM0.70m | 1:33PM-0.11m | 1:45AM0.76m | 2:16PM-0.13m | |||||||
 |  | |  |  | |  |  | | |  | |  | | | | | | | | | |
 | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — |
 | 7:06 | — | 7:06 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:08 | — | — | 7:09 |
2 | 5 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 22 | 23 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 24 | 24 | 22 | 24 | 23 | 22 | 23 | 23 | 22 | 23 | 23 |
23 | 25 | 28 | 24 | 24 | 23 | 25 | 24 | 23 | 22 | 23 | 23 | 21 | 23 | 21 | 21 | 22 | 22 | 23 | 24 | 24 | |
Swell 1 Height (m) Direction Period (s) | E 9 | ESE 9 | SW 4 | ESE 9 | ESE 10 | ESE 10 | E 10 | E 10 | E 9 | E 9 | ESE 9 | ESE 9 | SE 15 | SSE 8 | SE 15 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | NE 5 | E 9 |
 kJ | 81 | 140 | 1 | 113 | 96 | 96 | 65 | 65 | 44 | 43 | 29 | 35 | 9 | 7 | 8 | 165 | 133 | 92 | 106 | 7 | 106 |
Swell 2 Height (m) Direction Period (s) | SSE 9 | SW 5 | S 11 | SW 4 | SW 4 | — | SSE 8 | SE 7 | S 7 | S 7 | SE 12 | S 6 | SE 11 | SE 15 | — | ENE 10 | ENE 9 | — | NNE 5 | SE 12 | NNE 5 |
| kJ | 8 | 1 | 2 | 1 | 1 | — | 6 | 2 | 1 | 1 | 5 | 1 | 5 | 8 | — | 9 | 16 | — | 9 | 6 | 5 |
Swell 3 Height (m) Direction Period (s) | N 5 | — | — | — | — | — | — | ENE 9 | ENE 9 | SSE 7 | S 6 | SE 11 | S 6 | SE 15 | — | — | SE 14 | — | SE 12 | S 12 | SE 12 |
| kJ | 1 | — | — | — | — | — | — | 16 | 16 | 4 | 1 | 5 | 1 | 8 | — | — | 7 | — | 6 | 3 | 5 |
Wind waves Height (m) Direction Period (s) | ESE 3 | ESE 9 | ESE 9 | — | NE 3 | NE 3 | ENE 2 | E 3 | E 4 | E 4 | E 4 | E 5 | E 7 | E 5 | E 9 | ENE 5 | NE 4 | ENE 4 | E 4 | E 9 | — |
| kJ | 4 | 307 | 232 | — | 3 | 3 | 1 | 5 | 10 | 16 | 28 | 44 | 200 | 100 | 290 | 35 | 12 | 20 | 19 | 122 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 830 | 28 | 608 | 608 | 600 | 28 | 600 | 0 | 0 | 650 | 618 | 621 | 1014 | 621 | 815 | 1043 | 650 | 765 | 13 | 1 | 0 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.
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