- Forecast
- Maps
- Live
- Weather State
- Spot Information
Surf Forecasts:
Mainside surfForecast / Okinawa / Japan
48hr Weather and Surf, issued 8 pm Wednesday 15 Apr 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
24.3° C
(Which is slightly warmer than usual)How big are the waves at Mainside today?
The current surf forecast for Mainside at 4AM is: 0.6m 5s primary swell from a North direction (forecast issued at 08:00pm April 15). An open ocean swell of 1.3m 15s is not directed at the surf break, a second open ocean swell of 0.3m 5s is not directed at the surf break. The wind direction is predicted to be cross-onshore.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Apr) | 2ft (0.6m) | 5s |
| Afternoon (16 Apr) | 2.5ft (0.7m) | 6s |
| Evening (16 Apr) | 2.5ft (0.8m) | 7s |
Table - waves today at Mainside. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wed 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||||||||
| 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |   |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 5 | 4 | 4 | 4 | 5 | 5 | 5 | 6 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 13 | 11 | 16 | 15 | 17 | 19 | 28 | 37 | 43 | 62 | 66 | 71 | 53 | 98 | 88 | 86 | 64 | 67 | 31 | 206 | 17 | 9 | 4 | 29 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross | cross | cross | cross | cross | cross | cross | cross- off | cross- off | off | off | off | off | off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 6:08PM 1.85 | 6:21AM 1.88 | 6:50PM 1.96 | 6:51AM 1.96 | 7:31PM 2.01 | 7:21AM 2.01 | ||||||||||||||||||
Low Tide / height (m) | 12:18AM 0.33 | 12:36PM 0.18 | 12:54AM 0.35 | 1:11PM 0.02 | 1:29AM 0.41 | 1:48PM -0.09 | ||||||||||||||||||
Wed 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 6:05 | - | - | - | - | - | - | - | 6:03 | - | - | - | - | - | - | - | 6:03 | - | - |
| Sunset | 6:52 | - | - | - | - | - | - | - | 6:52 | - | - | - | - | - | - | - | 6:52 | - | - | - | - | - | - | - |
 |  |  | | | |  |  | |  | | | | | | | | | | | | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
| Temp. °C | 24 | 22 | 22 | 21 | 21 | 21 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 22 |
| Feels °C (?) | 25 | 21 | 21 | 20 | 20 | 20 | 21 | 20 | 21 | 20 | 21 | 21 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 22 | 21 | 22 | 22 |
- 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.
Nearest