Surf Forecasts:
Mainside surf forecast from 23 Oct 2026:
- Best quality surf: Thursday 29 Oct, 12PM (local time) - 3.5ft (1.1m), 9s period, NNW swell with cross-offshore winds.
- Most powerful swell: Wednesday 28 Oct, 12AM (local time) - 10ft (3.0m), 10s period, N swell with 1,802 kJ wave energy.
- Next surfable swell (1★+): Monday 26 Oct, 3AM (local time) - 3.5ft (1.1m), 9s period with W 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 Monday (Oct 26) at 3AM. The primary swell is predicted to be 1.1m 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 3.0m 10s and forecast to arrive on Wednesday (Oct 28) at 12AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 5.0m 16s period and expected on Friday (Oct 23) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Mon 26th Oct) | 3.5ft (1.1m) 9s |
| Best Surf | 12PM (Thu 29th Oct) | 3.5ft (1.1m) 9s |
| Most Powerful | 12AM (Wed 28th Oct) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Short Range ForecastModerate rain (total 11mm), heaviest on Fri afternoon. Warm (max 27°C on Fri morning, min 26°C on Sat night). Winds decreasing (strong winds from the ESE on Fri morning, light winds from the S by Sun night). | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Mon morning, min 22°C on Tue night). Winds increasing (light winds from the SSW on Mon morning, strong winds from the N by Tue afternoon). | ||||||||||||||||||||
Friday 23 | Saturday 24 | Sunday 25 | Monday 26 | Tuesday 27 | Wednesday 28 | Thursday 29 | |||||||||||||||
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 8 | N 8 | N 8 | SSE 12 | SSE 10 | SW 12 | NNW 9 | W 10 | W 10 | W 9 | WNW 8 | WNW 8 | NW 8 | NNW 8 | N 10 | N 10 | N 10 | NNW 10 | NNW 9 | N 8 | NNW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 111 | 45 | 10 | 0 | 0 | 0 | 8 | 70 | 262 | 177 | 112 | 145 | 475 | 723 | 1802 | 1633 | 1316 | 602 | 232 | 173 | 65 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | on | cross-on | cross-on | cross | cross | cross | cross-off | cross-off | cross-off | off |
High Tide | 5:30PM1.88m | 5:50AM1.89m | 5:59PM1.97m | 6:32AM2.00m | 6:28PM2.05m | 7:12AM2.07m | 6:58PM2.10m | 7:54AM2.09m | 7:30PM2.13m | 8:36AM2.05m | 8:04PM2.13m | 9:21AM1.96m | 8:40PM2.07m | ||||||||
Low Tide | 11:16AM0.60m | 11:43PM0.56m | 11:55AM0.57m | 00:17AM0.36m | 12:32PM0.57m | 00:51AM0.19m | 1:07PM0.60m | 1:28AM0.06m | 1:41PM0.67m | 2:06AM-0.01m | 2:17PM0.76m | 2:47AM-0.01m | 2:55PM0.86m | ||||||||
 |  |  | | | | |  |  | | |  | |  |  | | | | |  | | |
 | 6:31 | — | — | 6:31 | — | — | 6:33 | — | — | 6:33 | — | — | 6:33 | — | — | 6:35 | — | — | 6:35 | — | — |
 | — | 5:53 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:51 | — | — | 5:50 | — | — | 5:49 | — |
mm | — | 2 | 2 | 1 | 2 | 3 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — |
Temp °C | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 27 | 27 | 26 | 25 | 25 | 23 | 22 | 22 | 23 | 25 | 24 | 24 |
Feels °C | 23 | 23 | 23 | 24 | 24 | 25 | 28 | 28 | 29 | 31 | 30 | 25 | 21 | 19 | 16 | 15 | 16 | 20 | 26 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | S 15 | S 16 | SSW 15 | SW 13 | SW 13 | SW 12 | SW 11 | SW 10 | W 10 | W 9 | ESE 10 | ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | NNW 10 | NNW 9 | N 8 | ESE 9 |
| kJ | 4694 | 7191 | 6453 | 1613 | 990 | 1381 | 543 | 273 | 262 | 177 | 183 | 132 | 90 | 65 | 47 | 28 | 28 | 602 | 232 | 173 | 103 |
Swell 2 Height (m) Direction Period (s) | N 8 | N 8 | N 8 | — | — | — | NNW 9 | ESE 9 | ESE 9 | ESE 10 | WNW 8 | N 9 | S 7 | S 7 | S 6 | ESE 9 | ESE 9 | ESE 9 | E 8 | E 9 | NNW 8 |
| kJ | 111 | 45 | 10 | — | — | — | 8 | 82 | 124 | 183 | 112 | 14 | 4 | 4 | 1 | 45 | 45 | 28 | 80 | 61 | 65 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | NE 10 | W 10 | SW 9 | SW 7 | SW 7 | S 7 | SW 6 | SW 5 | W 9 | — | — | — | NE 8 | — | N 10 |
| kJ | — | — | — | — | — | — | 4 | 70 | 91 | 19 | 12 | 3 | 1 | 1 | 2 | — | — | — | 67 | — | 2 |
Wind waves Height (m) Direction Period (s) | ESE 8 | SE 10 | ESE 9 | SSE 12 | SSE 10 | SSE 9 | SSE 9 | S 8 | — | — | — | WNW 8 | NW 8 | NNW 8 | N 10 | N 10 | N 10 | E 4 | — | NE 3 | ENE 4 |
| kJ | 941 | 1540 | 904 | 2954 | 1956 | 749 | 449 | 161 | — | — | — | 145 | 475 | 723 | 1802 | 1633 | 1316 | 10 | — | 3 | 12 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 650 | 736 | 735 | 618 | 735 | 618 | 600 | 6 | 9 | 6 | 15 | 36 | 683 | 694 | 652 | 984 | 992 | 10 | 1 | 1 | 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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