Surf Forecasts:
Mainside surf forecast from 4 Oct 2026:
- Best quality surf: Saturday 10 Oct, 12PM (local time) - 4ft (1.2m), 9s period, E swell with offshore winds.
- Most powerful swell: Tuesday 6 Oct, 9PM (local time) - 5ft (1.6m), 16s period, E swell with 1,372 kJ wave energy.
- Next surfable swell (1★+): Sunday 4 Oct, 6PM (local time) - 2ft (0.6m), 10s 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 Sunday (Oct 04) at 6PM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.4m and 6s. 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 1.6m 16s and forecast to arrive on Tuesday (Oct 06) at 9PM. 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 Thursday (Oct 08) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Sun 4th Oct) | 2ft (0.6m) 10s |
| Best Surf | 12PM (Sat 10th Oct) | 4ft (1.2m) 9s |
| Most Powerful | 9PM (Tue 6th Oct) | 5ft (1.6m) 16s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Short Range ForecastLight rain (total 6mm), mostly falling on Sun afternoon. Warm (max 27°C on Sun morning, min 24°C on Tue night). Winds increasing (calm on Sun morning, strong winds from the N by Mon afternoon). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Thu night. Warm (max 27°C on Fri afternoon, min 25°C on Wed morning). Mainly fresh winds. | ||||||||||||||||||||
Sunday 4 | Monday 5 | Tuesday 6 | Wednesday 7 | Thursday 8 | Friday 9 | Saturday 10 | |||||||||||||||
AM | 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 7 | NNE 7 | NNE 6 | N 8 | N 7 | N 7 | NNW 8 | E 15 | E 16 | E 16 | E 16 | N 8 | NNE 7 | ENE 13 | ENE 6 | NE 6 | ENE 6 | E 16 | E 9 | E 9 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 24 | 15 | 8 | 18 | 44 | 396 | 570 | 720 | 1322 | 972 | 683 | 324 | 184 | 135 | 130 | 94 | 67 | 46 | 194 | 177 | 195 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | off | off |
High Tide | 2:33PM1.55m | 00:58AM1.64m | 4:07PM1.65m | 3:09AM1.66m | 4:58PM1.76m | 4:33AM1.79m | 5:35PM1.87m | 5:31AM1.93m | 6:06PM1.96m | 6:17AM2.03m | 6:34PM2.03m | 6:56AM2.08m | 7:00PM2.08m | ||||||||
Low Tide | 7:31PM1.31m | 8:42AM0.61m | 9:40PM1.19m | 10:08AM0.56m | 10:48PM0.98m | 11:07AM0.50m | 11:34PM0.76m | 11:52AM0.47m | 00:12AM0.56m | 12:30PM0.48m | 00:46AM0.40m | 1:02PM0.52m | 1:19AM0.29m | ||||||||
 |  |  | | |  |  | | |  | | | | |  | | | | | |  | |
 | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — |
 | — | 6:13 | — | — | 6:12 | — | — | 6:10 | — | — | 6:09 | — | — | 6:08 | — | — | 6:07 | — | — | 6:07 | — |
mm | — | 3 | — | — | 3 | — | — | — | — | — | — | — | — | — | 2 | — | — | 1 | 1 | 4 | 8 |
Temp °C | 27 | 27 | 26 | 27 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 27 | 26 | 27 | 27 | 27 |
Feels °C | 31 | 31 | 28 | 28 | 26 | 21 | 20 | 19 | 20 | 20 | 20 | 20 | 22 | 21 | 23 | 23 | 26 | 27 | 29 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | N 7 | ESE 11 | ESE 11 | ESE 10 | ESE 12 | ESE 12 | ESE 14 | E 15 | E 16 | E 16 | NNW 8 | E 14 | ENE 13 | N 7 | N 6 | NNW 6 | ENE 11 | NNE 6 | NNE 6 | E 16 | E 14 |
| kJ | 24 | 121 | 153 | 80 | 140 | 162 | 327 | 720 | 1322 | 972 | 187 | 324 | 184 | 72 | 41 | 8 | 25 | 31 | 12 | 76 | 66 |
Swell 2 Height (m) Direction Period (s) | NNW 6 | NNE 7 | NNE 6 | N 8 | NE 10 | ENE 10 | ENE 10 | — | — | — | E 16 | SE 13 | SE 13 | ENE 13 | ENE 12 | E 18 | NNW 6 | E 6 | E 16 | N 5 | ESE 10 |
| kJ | 17 | 15 | 8 | 18 | 28 | 40 | 39 | — | — | — | 683 | 7 | 7 | 135 | 85 | 25 | 3 | 19 | 77 | 5 | 10 |
Swell 3 Height (m) Direction Period (s) | E 8 | NNW 6 | NNW 6 | ESE 12 | SSE 10 | — | E 22 | — | — | — | — | — | S 8 | SE 13 | SE 12 | SE 12 | E 17 | E 16 | SE 11 | SE 11 | S 7 |
| kJ | 21 | 8 | 8 | 30 | 11 | — | 38 | — | — | — | — | — | 1 | 6 | 6 | 6 | 23 | 46 | 5 | 4 | 1 |
Wind waves Height (m) Direction Period (s) | — | — | — | NNE 3 | N 7 | N 7 | NNW 8 | NNW 8 | NNW 9 | N 8 | NNE 8 | N 8 | NNE 7 | ENE 5 | ENE 6 | NE 6 | ENE 6 | — | E 9 | E 9 | E 8 |
| kJ | — | — | — | 3 | 44 | 396 | 570 | 629 | 738 | 539 | 244 | 282 | 178 | 39 | 130 | 94 | 67 | — | 194 | 177 | 195 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 27 | 27 | 650 | 650 | 652 | 652 | 652 | 608 | 650 | 650 | 27 | 27 | 1019 | 735 | 10 | 1 | 10 | 1 | 0 | 0 |
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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