Mainside surfForecast / Okinawa / Japan

information circle12 Day Weather and Surf, issued 8 pm Wednesday 10 Dec 2025 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
24.7° C
(Which is slightly warmer than usual)


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 Saturday (Dec 13) at 6AM. The primary swell is predicted to be 1.3m and 9s period with a secondary swell of 0.7m and 7s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Mainside in the next 12 days are 3.0m 9s and forecast to arrive on Sunday (Dec 14) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Friday (Dec 12) at 9AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Sat 13th Dec)4.5ft (1.3m) 9s
Best Surf 6AM (Sat 13th Dec)4.5ft (1.3m) 9s
Most Powerful12PM (Sun 14th Dec)10ft (3.0m) 9s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Moderate rain (total 10mm), heaviest on Thu afternoon. Warm (max 23°C on Wed night, min 20°C on Thu night). Winds decreasing (strong winds from the NNE on Thu night, calm by Fri night).

Days 3-6 Weather Summary Mostly dry. Warm (max 21°C on Sat night, min 17°C on Sat night). Winds decreasing (strong winds from the NNW on Sat night, light winds from the ENE by Tue morning).

Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wed
17
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
1
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.6
E
0.4
N
0.7
SW
2.2
N
0.7
NNW
2.2
NE
1.5
N
1.2
N
1
N
2.5
NNW
3
NNW
3
NNW
2.4
NNW
1.9
NNW
1.6
NNW
1.2
N
0.8
NNW
0.6
NNW
0.4
NNW
0.6
E
0.6
E
Period(s) (?)964777899899998877799
Wave
Graph
(?)Metric surfscale
Energy kJ (?)54111443442460324215154780168415699175063591817140156361
Wind
(km/h)
20
SSE
20
S
25
W
35
NNE
30
NE
35
NE
20
NE
10
W
25
NW
40
NNW
45
N
40
N
30
N
35
NNE
30
NNE
20
ENE
20
ENE
20
NE
20
E
25
ENE
25
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
off
cross-
on
crosscross-
off
cross-
off
cross-
off
cross-
on
cross-
on
cross-
on
cross-
on
cross-
on
crosscrosscrosscross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
High Tide
/ height (m)
10:52PM
1.61
12:26PM
1.61
12:02AM
1.47
1:23PM
1.59
1:30AM
1.36
2:20PM
1.59
3:04AM
1.33
3:12PM
1.60
4:25AM
1.36
3:59PM
1.63
5:26AM
1.42
4:38PM
1.66
6:13AM
1.48
5:13PM
1.68
Low Tide
/ height (m)
5:40AM
0.36
6:28PM
0.85
6:37AM
0.53
7:45PM
0.79
7:40AM
0.68
9:01PM
0.69
8:46AM
0.79
10:04PM
0.56
9:49AM
0.86
10:55PM
0.44
10:44AM
0.90
11:37PM
0.34
11:29AM
0.93
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wed
17
Sunrise-7:05--7:05--7:07--7:07--7:07--7:09--7:09-
Sunset--5:37--5:37--5:37--5:37--5:37--5:38--5:38
part cloud
rain showers
rain showers
part cloud
rain showers
cloud
part cloud
rain showers
cloud
cloud
cloud
part cloud
part cloud
clear
clear
part cloud
part cloud
cloud
rain showers
part cloud
clear
Rain (mm)
-26-1--1----------2--
Temp. °C232322212121212222211717171818181919202120
Feels °C (?)212120161616172319159891111121616171615
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

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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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