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Surf Forecasts:

Mainside surfForecast / Okinawa / Japan

information circle12 Day Weather and Surf, issued 2 am Thursday 12 Mar 2026 JST
Forecast 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
21.8° C
 (Which is normal for this time of year)

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 Tuesday (Mar 17) at 12AM. The primary swell is predicted to be 0.9m and 13s period with a secondary swell of 0.6m and 17s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Mainside in the next 12 days are 3.5m 9s and forecast to arrive on Saturday (Mar 14) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Thursday (Mar 19) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Tue 17th Mar)3ft (0.9m) 13s
Best Surf12AM (Tue 17th Mar)3ft (0.9m) 13s
Most Powerful 3AM (Sat 14th Mar)11ft (3.5m) 9s

Table - best surf conditions forecast for Mainside over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table

Short Range Forecast Moderate rain (total 12mm), heaviest on Thu morning. Very mild (max 17°C on Thu morning, min 14°C on Fri night). Winds increasing (light winds from the NW on Thu morning, near gales from the N by Fri afternoon).

Days 3-6 Weather Summary Mostly dry. Very mild (max 19°C on Sun night, min 17°C on Mon night). Wind will be generally light.

Thursday
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
1
2
2
1
2
1
1
2
2
1
2
2
1
1
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.4
NNW
1.3
NNW
3
NNW
3.5
NNW
3.5
N
3.5
N
3
N
2.3
N
1.3
ENE
1.5
ENE
1.4
ENE
1.1
ENE
1
E
0.9
E
0.9
E
0.9
ENE
0.9
ENE
0.8
ENE
0.8
ENE
0.8
ENE
0.7
ENE
Period(s) (?)758999101016151514141313161615151414
Wave
Graph
(?)Metric surfscale
Energy kJ (?)15698441711173019181493972848988795465405268276416411316288273204
Wind
(km/h)
10
NW
35
NNW
45
N
50
N
55
N
50
N
45
NNE
35
NNE
25
NE
20
NNE
25
NNE
20
NE
20
N
20
N
10
ENE
10
ENE
5
NW
15
ESE
15
SSE
15
SSE
20
SSE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
oncross-
on		cross-
on		cross-
on		crosscrosscrosscross-
off		cross-
off		crosscrosscross-
off		crosscrosscross-
off		cross-
off		onoffcross-
off		cross-
off		cross-
off
High Tide
/ height (m)
11:38AM
1.38
4:45AM
1.21
1:35PM
1.28
5:25AM
1.35
3:47PM
1.33
5:51AM
1.48
4:56PM
1.48
6:15AM
1.61
5:44PM
1.64
6:39AM
1.71
6:25PM
1.80
7:04AM
1.80
7:04PM
1.92
Low Tide
/ height (m)
8:04PM
0.57
8:28AM
1.16
9:49PM
0.51
10:46AM
1.05
10:53PM
0.39
11:31AM
0.88
11:38PM
0.27
12:03PM
0.70
12:15AM
0.17
12:33PM
0.52
12:49AM
0.11
1:03PM
0.34
1:22AM
0.10
Thursday
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
Sunrise6:41--6:41--6:39--6:39--6:37--6:37--6:35--
Sunset-6:35--6:36--6:36--6:37--6:37--6:37--6:37-
rain showers
rain showers
rain showers
light rain
part cloud
cloud
part cloud
clear
part cloud
part cloud
cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
2451-----------------
Temp. °C171616161615161517181819191818181919202119
Feels °C (?)151065447712141416151415181818171817
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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.

View detailed surf forecast for Mainside at:
surf-forecast.com

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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