Mainside Surf Break

Lat Long: 26.44° N 127.71° E

Mainside Surf Forecast and Surf Report

Issued: 8 am 29 Aug 2026 (local time)

Forecast update in  hr  min

Today's Mainside sea temperature is
28.5°C
0.2° 

Mainside surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Mainside surf forecast from 29 Aug 2026:

  • Best quality surf: Friday 4 Sep, 9PM (local time) - 3ft (0.9m), 10s period, E swell with offshore winds.
  • Most powerful swell: Thursday 3 Sep, 3AM (local time) - 7ft (2.1m), 12s period, E swell with 1,187 kJ wave energy.
  • Next surfable swell (1★+): Friday 4 Sep, 12PM (local time) - 3ft (0.9m), 9s period with E swell.

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 Friday (Sep 04) at 12PM. The primary swell is predicted to be 0.9m and 9s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Mainside in the next 16 days are 2.1m 12s and forecast to arrive on Thursday (Sep 03) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 8s period and expected on Tuesday (Sep 01) at 6PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12PM (Fri 4th Sep)3ft (0.9m) 9s
Best Surf 9PM (Fri 4th Sep)3ft (0.9m) 10s
Most Powerful 3AM (Thu 3rd Sep)7ft (2.1m) 12s

Table - best surf conditions forecast for Mainside over the next 16 days.


The Lowdown

Alright folks, Rusty here. Let’s get into it. This is a look at what’s coming up for Mainside, a reef break that’s exposed and likes the north swell. The water temp is sitting at 83°F right now, which is bang on normal for this time of year, so no surprises there.

The next couple of weeks are a real mixed bag. We’ve got a lot of empty, flat days to wade through before we get to the good stuff. From Saturday the 29th through to Friday the 4th of September, it’s a write-off. Tiny swell, or the wind is just too strong and messy. It’s a tough stretch.

Then we get a bit of a tease. On Saturday the 5th of September, the morning sees a 3ft swell from the east with a gentle offshore breeze. The combined energy is weak at 211, but it’s clean and the wind is right. The afternoon picks up a bit more energy at 279, with a 3ft north swell, but it’s still small. It’s a window, but not a standout.

The real highlight, the one you’ve been waiting for, is Sunday the 6th of September. The morning is the best on offer. We’re looking at a solid 7ft swell from the east with a light breeze, and the combined energy is moderate at 627. The wind is clean, and for a reef, that’s a dream. This is a serious session for experienced surfers; 7ft on a reef isn’t beginner territory, but the quality is there. The afternoon drops off to 5ft, so make the most of the morning.

After that, it gets messy again. Monday the 7th and Tuesday the 8th see strong cross-shore winds and lumpy conditions, pushing the energy up but ruining the quality. A couple of days later, on Thursday the 10th, we get a 6ft swell from the east-northeast with a very long period of 13 seconds, and the energy is strong at 1035. This is a groundswell, and it’s going to be fast and powerful. It’ll be clean but the cross-off wind means it’s not perfectly lined up.

Looking ahead to Sunday the 13th of September, which is a long way off, the forecast is promising but less certain. The afternoon session shows a 8ft swell from the west with a period of 12 seconds, and the combined energy is very strong at 1644. The wind is moderate offshore. If this holds, it’s a big, powerful, clean swell for the experts. The morning of the same day is also a solid 8ft from the west with a fresh offshore breeze and energy at 1441. This is the one to watch in the long range, but don’t book the trip just yet.

Overall, Sunday the 6th of September morning is your clear winner. Clean, decent size, and the reef will be working. The long-range Sunday the 13th is the big one if it comes together.

Rusty out.

Short Range Forecast

Light rain (total 7mm), mostly falling on Mon night. Warm (max 29°C on Sat morning, min 27°C on Sat night). Winds increasing (moderate winds from the ESE on Sat night, strong winds from the E by Mon night).

Days 4-6 Weather Summary

Heavy rain (total 63mm), heaviest during Tue night. Warm (max 29°C on Thu morning, min 26°C on Tue night). Mainly near gales.

Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
1
2
1
0
0
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.5
W
8
0.4
W
8
0.2
ENE
12
0.2
ENE
12
0.2
ENE
12
0.2
ENE
11
2
E
9
2.4
E
9
2.2
ESE
9
0.3
NNE
6
2.4
ESE
8
3
ESE
9
2.5
ESE
9
1.9
E
9
2.3
ENE
10
1.5
E
11
1.3
E
10
1.1
E
10
0.9
E
9
0.9
E
10
0.8
E
9
Wave Graph
Metric surfscale
Energy kJ
33
20
15
14
14
13
613
921
0
6
0
0
0
580
1061
514
367
239
137
143
109
Wind (km/h)
30
SE
25
SE
25
SE
25
E
25
E
30
ENE
40
ENE
40
E
35
ESE
50
ESE
40
ESE
25
S
35
SSE
35
SE
35
S
35
SE
35
SE
30
SSE
15
SSE
15
SSE
15
SE
Wind State
off
off
off
off
off
cross-off
cross-off
cross-off
off
off
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
High Tide
8:14PM2.11m
8:14AM2.20m
8:39PM2.14m
8:52AM2.18m
9:06PM2.15m
9:32AM2.11m
9:36PM2.12m
10:17AM1.97m
10:08PM2.07m
11:11AM1.79m
10:46PM1.98m
12:27PM1.61m
11:36PM1.86m
Low Tide
2:01PM0.34m
2:13AM0.58m
2:31PM0.39m
2:45AM0.47m
3:01PM0.49m
3:20AM0.42m
3:33PM0.63m
4:00AM0.41m
4:07PM0.80m
4:48AM0.46m
4:45PM1.00m
5:47AM0.54m
5:33PM1.19m
clear
clear
clear
clear
clear
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
thunderstorm
thunderstorm
clear
thunderstorm
part cloud
thunderstorm
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:07
6:07
6:07
6:07
6:07
6:09
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:52
6:52
6:51
6:49
6:47
6:46
6:45
 mm
2
2
3
2
4
32
4
10
8
1
2
2
Temp °C
29
29
28
28
28
27
28
28
28
28
28
27
28
28
28
29
29
28
29
30
28
Feels °C
30
30
30
29
29
27
27
26
28
25
28
29
27
29
28
28
29
29
32
33
33
  • 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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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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