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Mainside surfForecast / Okinawa / Japan
12 Day Weather and Surf, issued 8 pm Thursday 18 Sep 2025 JST
Best Forecast Surf Conditions for Mainside this week:
The surf forecast for Mainside over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 22) at 6PM. The primary swell is predicted to be 0.5m and 8s period with a secondary swell of 0.4m and 8s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Mainside in the next 12 days are 0.6m 8s and forecast to arrive on Tuesday (Sep 23) at 3AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 12s period and expected on Monday (Sep 22) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Mon 22nd Sep) | 1.5ft (0.5m) 8s |
| Best Surf | 6PM (Mon 22nd Sep) | 1.5ft (0.5m) 8s |
| Most Powerful | 3AM (Tue 23rd Sep) | 2ft (0.6m) 8s |
Table - best surf conditions forecast for Mainside over the next 12 days.
Short Range Forecast Light rain (total 5mm), mostly falling on Sat afternoon. Warm (max 30°C on Fri afternoon, min 27°C on Thu night). Wind will be generally light. | Days 3-6 Weather Summary Heavy rain (total 20mm), heaviest during Mon afternoon. Warm (max 29°C on Mon morning, min 28°C on Sun night). Mainly fresh winds. | |||||||||||||||||||||
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | Thu 25 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 9 | 10 | 9 | 7 | 7 | 8 | 7 | 7 | 6 | 7 | 7 | 6 | 8 | 8 | 7 | 7 | 8 | 9 | 9 | 8 | 10 | |
Wave (?)Graph  | ||||||||||||||||||||||
 kJ (?) | 13 | 17 | 14 | 18 | 21 | 19 | 10 | 4 | 4 | 10 | 18 | 23 | 22 | 43 | 26 | 9 | 4 | 8 | 8 | 0 | 18 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | off | off | off | off | off | off | off | off | off | |
High Tide / height (m) | 5:29AM 1.88 | 6:32PM 1.94 | 6:15AM 1.99 | 6:58PM 2.00 | 6:54AM 2.06 | 7:20PM 2.05 | 7:27AM 2.08 | 7:42PM 2.08 | 7:58AM 2.06 | 8:02PM 2.09 | 8:27AM 2.02 | 8:22PM 2.09 | 8:55AM 1.95 | |||||||||
Low Tide / height (m) | 11:49PM 0.99 | 12:05PM 0.43 | 12:26AM 0.81 | 12:41PM 0.41 | 12:57AM 0.66 | 1:12PM 0.44 | 1:27AM 0.54 | 1:39PM 0.49 | 1:53AM 0.46 | 2:02PM 0.56 | 2:19AM 0.42 | 2:24PM 0.64 | 2:45AM 0.40 | 2:44PM 0.73 | ||||||||
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | Thu 25 | ||||||||||||||||
| Sunrise | - | 6:15 | - | - | 6:16 | - | - | 6:16 | - | - | 6:16 | - | - | 6:16 | - | - | 6:18 | - | - | 6:18 | - | |
| Sunset | - | - | 6:30 | - | - | 6:28 | - | - | 6:27 | - | - | 6:25 | - | - | 6:24 | - | - | 6:23 | - | - | 6:22 | |
 |  | | | |  | | | |  | | |  | | | | | | | | | ||
Rain (mm) | - | - | - | - | - | 1 | - | 2 | 2 | - | 1 | 10 | 4 | 3 | 2 | - | - | - | - | 1 | 6 | |
| Temp. °C | 28 | 29 | 30 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | |
| Feels °C (?) | 30 | 33 | 33 | 31 | 33 | 32 | 31 | 30 | 30 | 29 | 29 | 29 | 29 | 28 | 30 | 28 | 29 | 30 | 29 | 31 | 31 | |
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Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Okinawa
Continuing clean conditions at Mainside (light winds from the ENE at Kadena Air Force Base Airport 11 km from Mainside). No surfable waves
2 h 31 min ago
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 12 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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