Surf Forecasts:
Mainside surf forecast from 21 Sep 2026:
- Best quality surf: Wednesday 23 Sep, 12AM (local time) - 3ft (0.9m), 8s period, N swell with glassy winds.
- Most powerful swell: Monday 21 Sep, 6PM (local time) - 4.5ft (1.4m), 8s period, N swell with 260 kJ wave energy.
- Next surfable swell (1★+): Wednesday 23 Sep, 12AM (local time) - 3ft (0.9m), 8s period with N 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 Wednesday (Sep 23) at 12AM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.2m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Mainside in the next 16 days are 1.4m 8s and forecast to arrive on Monday (Sep 21) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 15s period and expected on Monday (Sep 28) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 23rd Sep) | 3ft (0.9m) 8s |
| Best Surf | 12AM (Wed 23rd Sep) | 3ft (0.9m) 8s |
| Most Powerful | 6PM (Mon 21st Sep) | 4.5ft (1.4m) 8s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Short Range ForecastMostly dry. Warm (max 27°C on Mon afternoon, min 25°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Fri night. Warm (max 29°C on Sat afternoon, min 26°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | Sunday 27 | ||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 7 | N 7 | N 6 | N 6 | E 10 | E 9 | E 9 | SE 11 | N 7 | E 9 | NE 10 | ENE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 298 | 181 | 116 | 90 | 93 | 78 | 74 | 78 | 39 | 24 | 13 | 6 | 7 | 6 | 6 | 0 | 4 | 6 | 14 | 7 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | glassy | glassy | on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off |
High Tide | 5:12PM1.60m | 3:33AM1.53m | 5:37PM1.72m | 4:45AM1.66m | 5:59PM1.83m | 5:32AM1.81m | 6:22PM1.93m | 6:12AM1.96m | 6:45PM2.01m | 6:49AM2.08m | 7:09PM2.08m | 7:25AM2.17m | 7:35PM2.14m | |||||||
Low Tide | 10:42PM1.30m | 10:37AM0.71m | 11:24PM1.13m | 11:23AM0.60m | 11:53PM0.96m | 11:59AM0.51m | 00:20AM0.78m | 12:32PM0.45m | 00:48AM0.60m | 1:03PM0.43m | 1:17AM0.43m | 1:34PM0.45m | 1:49AM0.30m | |||||||
 |  | |  |  | | | | | | | | |  |  | | | | | | |
 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 6:27 | — | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:22 | — | — | 6:21 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — | — | — |
Temp °C | 27 | 27 | 26 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 28 | 26 | 28 | 29 | 27 | 29 | 29 | 27 |
Feels °C | 25 | 26 | 26 | 27 | 27 | 29 | 29 | 28 | 30 | 30 | 28 | 29 | 31 | 28 | 32 | 32 | 30 | 32 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | ENE 12 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 7 | N 7 | N 6 | N 6 | N 6 | SE 14 | SE 11 | SE 11 | SE 11 | SSE 14 | SSE 14 | SSE 14 |
| kJ | 145 | 181 | 116 | 90 | 93 | 78 | 74 | 78 | 39 | 24 | 13 | 6 | 2 | 48 | 153 | 145 | 278 | 777 | 988 | 1259 |
Swell 2 Height (m) Direction Period (s) | S 8 | ENE 11 | NE 11 | NE 11 | ENE 10 | E 11 | NE 9 | ENE 10 | E 10 | E 9 | E 9 | E 10 | E 10 | N 5 | NNE 5 | SE 13 | SSE 12 | E 9 | ENE 8 | ENE 8 |
| kJ | 1 | 73 | 32 | 29 | 10 | 9 | 3 | 9 | 7 | 7 | 7 | 2 | 7 | 2 | 2 | 46 | 50 | 6 | 7 | 7 |
Swell 3 Height (m) Direction Period (s) | SE 10 | S 8 | SE 9 | SE 9 | SE 9 | NE 9 | SE 9 | SE 9 | SE 9 | SE 8 | SE 9 | SE 9 | SE 8 | E 9 | E 9 | SSE 14 | N 7 | N 6 | NE 10 | — |
| kJ | 4 | 1 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 6 | 6 | 40 | 4 | 3 | 14 | — |
Wind waves Height (m) Direction Period (s) | N 8 | — | — | — | — | — | — | — | — | NE 2 | E 3 | — | E 3 | ENE 3 | — | — | — | — | — | — |
| kJ | 298 | — | — | — | — | — | — | — | — | 1 | 1 | — | 1 | 2 | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 652 | 980 | 13 | 10 | 15 | 0 | 0 | 10 | 0 | 1346 | 1346 | 618 | 1277 | 1353 | 10 | 10 | 14 | 10 | 14 | 14 |
Best forecast wave conditions in Okinawa | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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.
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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