Mainside Surf Break

Lat Long: 26.44° N 127.71° E

Mainside Surf Forecast and Surf Report

Issued: 2 am 20 Aug 2026 (local time)

Forecast update in  hr  min

Today's Mainside sea temperature is
28.7° C
0.1° 

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


Mainside surf forecast from 19 Aug 2026:

  • Most powerful swell: Tuesday 25 Aug, 9AM (local time) - 6.5ft (2.0m), 16s period, E swell with 2,183 kJ wave energy.

Best Forecast Surf Conditions for Mainside this week:

The most powerful waves expected at Mainside in the next 16 days are 2.0m 16s and forecast to arrive on Tuesday (Aug 25) at 9AM. 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 10s period and expected on Saturday (Aug 22) at 12AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 9AM (Tue 25th Aug)6.5ft (2.0m) 16s

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


The Lowdown

Alright folks, Rusty here. Let's have a look at what's on the table for the next couple of weeks.

Honestly, this is a tough one. The forecast is pretty grim for the foreseeable future. We’ve got a solid stretch of poor surf conditions ahead, with strong offshore winds making it almost impossible to paddle into anything, and when there is a tiny bit of swell, it’s often accompanied by storm risks. The water temp is sitting right around average for this time of year at 84°F, so nothing unusual there.

The first real sniff of something rideable doesn't come until Tuesday the 25th of August. That morning, Mainside (a reef break for advanced surfers) could see a 7ft easterly groundswell with a very long 16-second period. The energy is strong at 2183, so there's some serious power behind it. Conditions are clean with a cross-offshore breeze, which sounds promising. But come afternoon, the wind swings cross-shore and the quality drops off a cliff. That Tuesday morning window is the only real standout in the whole 16-day forecast – it's the best on offer, but it's a narrow window. After that, we’re back into small, messy, or onshore conditions for the rest of the run.

There are long gaps of nothing but poor surf in between. The period from now right through to the 25th is a write-off, and after that Tuesday morning, it’s a slow slide back into marginal, small, and choppy waves. A few mornings around the 28th of August to the 1st of September show tiny, knee-high waves with clean offshore winds, but the energy is weak (under 100) and the swell is short-period. Not worth paddling out for unless you’re desperate for a float.

To be brutally honest, the only day that gets a thumbs up is the morning of Tuesday the 25th of August at Mainside. The rest of the 16 days is a struggle. If you’ve got a kite, the strong winds and lumpy conditions might be more your thing, but for a surfboard, it’s a waiting game.

Rusty.

Short Range Forecast

Heavy rain (total 23mm), heaviest during Fri morning. Warm (max 29°C on Thu morning, min 26°C on Fri night). Winds increasing (moderate winds from the ESE on Thu afternoon, gales from the SE by Fri afternoon).

Days 4-6 Weather Summary

Moderate rain (total 10mm), heaviest on Sun morning. Warm (max 29°C on Tue morning, min 27°C on Sun morning). Winds decreasing (strong winds from the ESE on Sun morning, moderate winds from the N by Tue night).

Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
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
0
0
3
1
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.1
ESE
8
1.1
ESE
7
1.3
ESE
6
0.3
ENE
8
1.9
SE
7
3
SE
10
2.5
SE
10
0.1
E
14
2
SE
9
1.5
S
10
1.8
SSE
10
1.3
SSE
10
0.1
E
13
1.4
ESE
18
1.9
ESE
17
2
E
16
2.1
E
15
1.6
E
14
1.2
E
14
1.1
ENE
14
0.8
ENE
13
Wave Graph
Metric surfscale
Energy kJ
0
0
0
13
0
0
0
4
0
0
0
0
3
0
0
2183
2069
1045
545
433
198
Wind (km/h)
25
ESE
25
SE
30
ESE
40
SE
55
SE
50
SE
50
ESE
45
SE
45
SE
40
ESE
40
SE
30
ESE
30
ESE
30
ESE
25
E
20
ENE
25
NNE
25
NNW
30
NW
35
WNW
30
W
Wind State
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
cross-off
cross
cross-on
on
on
on
High Tide
12:19PM1.50m
11:42PM1.80m
2:15PM1.40m
00:33AM1.69m
5:17PM1.48m
2:15AM1.61m
6:02PM1.61m
4:01AM1.63m
6:26PM1.73m
5:05AM1.73m
6:47PM1.83m
5:50AM1.85m
7:07PM1.92m
Low Tide
5:24PM1.15m
7:13AM0.83m
6:02PM1.32m
8:53AM0.84m
8:41PM1.43m
10:25AM0.77m
11:03PM1.37m
11:21AM0.66m
11:53PM1.25m
12:00PM0.54m
00:24AM1.12m
12:33PM0.45m
00:51AM0.99m
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
cloud
thunderstorm
part cloud
clear
clear
clear
part cloud
clear
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:03
6:03
6:03
6:03
6:05
6:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:00
7:00
7:00
6:59
6:58
6:57
6:55
 mm
1
2
2
2
5
3
2
6
5
1
3
1
7
Temp °C
29
28
27
27
27
27
28
27
27
27
28
27
27
27
28
29
28
27
28
28
28
Feels °C
30
30
27
26
23
23
25
25
25
25
26
27
27
27
29
31
29
29
29
28
29
  • 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
How to use the Wavefinder 
submit an eyeball surf report

Quick surf report for Mainside:

join our community of surf reporters

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 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.

Nearest locationNearest