Surf Forecasts:
Mainside surf forecast from 18 Oct 2026:
- Best quality surf: Sunday 18 Oct, 3PM (local time) - 2.5ft (0.8m), 8s period, E swell with cross-offshore winds.
- Most powerful swell: Thursday 22 Oct, 9PM (local time) - 11ft (3.5m), 9s period, NE swell with 1,753 kJ wave energy.
- Next surfable swell (1★+): Sunday 18 Oct, 3PM (local time) - 2.5ft (0.8m), 8s 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 18) at 3PM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.1m and 14s. 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 3.5m 9s and forecast to arrive on Thursday (Oct 22) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.5m 17s period and expected on Thursday (Oct 22) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Sun 18th Oct) | 2.5ft (0.8m) 8s |
| Best Surf | 3PM (Sun 18th Oct) | 2.5ft (0.8m) 8s |
| Most Powerful | 9PM (Thu 22nd Oct) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Short Range ForecastMostly dry. Warm (max 28°C on Sun morning, min 25°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Thu morning. Warm (max 28°C on Fri morning, min 23°C on Thu morning). Winds increasing (moderate winds from the NE on Wed morning, near gales from the NE by Thu morning). | ||||||||||||||||||||
Sunday 18 | Monday 19 | Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | |||||||||||||||
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) | E 8 | E 8 | E 8 | E 8 | E 9 | ENE 9 | ESE 14 | ESE 14 | ENE 9 | NNW 7 | NNE 5 | NNE 7 | NNE 8 | NNE 9 | NE 9 | E 8 | E 8 | E 8 | NNE 8 | E 8 | NNE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 95 | 80 | 64 | 48 | 99 | 32 | 0 | 0 | 201 | 9 | 66 | 537 | 1385 | 1397 | 1580 | 709 | 477 | 432 | 72 | 136 | 17 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off |
High Tide | 12:29PM1.47m | 10:45PM1.57m | 2:26PM1.48m | 00:24AM1.44m | 3:45PM1.57m | 2:48AM1.45m | 4:28PM1.67m | 4:11AM1.58m | 5:00PM1.78m | 5:05AM1.74m | 5:30PM1.88m | 5:50AM1.89m | 5:59PM1.97m | ||||||||
Low Tide | 5:13PM1.27m | 6:34AM0.72m | 7:39PM1.30m | 8:11AM0.76m | 9:40PM1.17m | 9:33AM0.72m | 10:32PM0.98m | 10:31AM0.65m | 11:10PM0.77m | 11:16AM0.60m | 11:43PM0.56m | 11:55AM0.57m | 00:17AM0.36m | ||||||||
 |  |  | | | | | | | | |  |  | |  |  | | | | | | |
 | 6:28 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — |
 | — | 5:59 | — | — | 5:58 | — | — | 5:57 | — | — | 5:55 | — | — | 5:54 | — | — | 5:53 | — | — | 5:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 | 1 | — | 3 | 2 | 3 | — | 1 | 2 |
Temp °C | 28 | 28 | 26 | 27 | 27 | 25 | 27 | 28 | 26 | 27 | 27 | 26 | 23 | 24 | 26 | 28 | 28 | 27 | 28 | 27 | 26 |
Feels °C | 30 | 30 | 28 | 28 | 28 | 28 | 30 | 31 | 29 | 27 | 26 | 22 | 16 | 18 | 23 | 26 | 26 | 26 | 28 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | ENE 12 | E 8 | E 8 | E 8 | E 9 | ESE 9 | ESE 14 | ESE 14 | SE 16 | SE 16 | SE 16 | SE 17 | SSE 17 | SSE 16 | S 16 | S 16 | S 16 | S 16 | S 14 | SSW 14 | SW 12 |
| kJ | 14 | 80 | 64 | 48 | 99 | 84 | 553 | 653 | 1715 | 2445 | 3304 | 5758 | 6284 | 4889 | 3598 | 4161 | 4169 | 3510 | 2853 | 2740 | 456 |
Swell 2 Height (m) Direction Period (s) | SE 11 | E 14 | NE 11 | — | N 6 | ENE 9 | SE 15 | SE 17 | NNW 7 | NNW 7 | SSE 19 | SSE 18 | — | — | N 9 | N 8 | N 8 | N 8 | NNE 8 | NE 8 | S 11 |
| kJ | 5 | 4 | 5 | — | 1 | 32 | 8 | 179 | 18 | 9 | 2592 | 326 | — | — | 325 | 239 | 133 | 30 | 72 | 33 | 284 |
Swell 3 Height (m) Direction Period (s) | — | E 13 | SE 10 | N 7 | SE 18 | SE 15 | S 14 | SSE 18 | SSE 16 | SE 16 | — | — | — | — | — | — | — | — | — | N 7 | NNE 7 |
| kJ | — | 3 | 4 | 1 | 12 | 56 | 4 | 33 | 25 | 65 | — | — | — | — | — | — | — | — | — | 8 | 17 |
Wind waves Height (m) Direction Period (s) | E 8 | ENE 4 | ENE 3 | E 3 | E 9 | — | E 3 | — | ENE 9 | NE 4 | NNE 5 | NNE 7 | NNE 8 | NNE 9 | NE 9 | E 8 | E 8 | E 8 | — | E 8 | ESE 8 |
| kJ | 95 | 5 | 4 | 3 | 52 | — | 3 | — | 201 | 14 | 66 | 537 | 1385 | 1397 | 1580 | 709 | 477 | 432 | — | 136 | 143 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 0 | 0 | 28 | 0 | 10 | 13 | 10 | 10 | 10 | 683 | 682 | 650 | 650 | 736 | 736 | 736 | 650 | 736 | 9 | 14 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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