Surf Forecasts:
Mainside surf forecast from 1 Aug 2026:
- Best quality surf: Thursday 6 Aug, 6AM (local time) - 15ft (4.5m), 20s period, E swell with cross-shore winds.
- Most powerful swell: Friday 7 Aug, 12AM (local time) - 38ft (11.5m), 14s period, NNE swell with 47,770 kJ wave energy.
- Next surfable swell (1★+): Tuesday 4 Aug, 3PM (local time) - 4.5ft (1.4m), 18s 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 Tuesday (Aug 04) at 3PM. The primary swell is predicted to be 1.4m and 18s period with a secondary swell of 0.4m and 5s. 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 11.5m 14s and forecast to arrive on Friday (Aug 07) 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 11.0m 12s period and expected on Friday (Aug 07) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Tue 4th Aug) | 4.5ft (1.4m) 18s |
| Best Surf | 6AM (Thu 6th Aug) | 15ft (4.5m) 20s |
| Most Powerful | 12AM (Fri 7th Aug) | 38ft (11.5m) 14s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Short Range ForecastLight rain (total 3mm), mostly falling on Mon night. Warm (max 30°C on Sat afternoon, min 28°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 33mm), heaviest during Thu night. Warm (max 31°C on Tue afternoon, min 29°C on Tue morning). Winds increasing (light winds from the NE on Tue afternoon, extremely windy from the NNE by Thu night). | ||||||||||||||||||||
Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | |||||||||||||||
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 9 | E 9 | E 9 | E 19 | E 8 | E 16 | E 15 | N 3 | N 5 | E 18 | E 18 | E 18 | E 18 | E 19 | E 19 | E 19 | E 19 | NNE 14 | N 12 | N 11 | E 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 6 | 6 | 29 | 6 | 245 | 287 | 3 | 20 | 1075 | 1197 | 1561 | 2325 | 3999 | 9047 | 16331 | 18588 | 47770 | 4021 | 89 | 5 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | glassy | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross | cross | cross-off | off |
High Tide | 9:15PM2.06m | 9:02AM2.11m | 9:44PM2.06m | 9:44AM2.05m | 10:15PM2.05m | 10:30AM1.94m | 10:49PM2.01m | 11:26AM1.80m | 11:29PM1.96m | 12:40PM1.64m | 00:20AM1.89m | 2:33PM1.55m | 1:33AM1.83m | ||||||||
Low Tide | 2:54PM0.31m | 3:08AM0.74m | 3:26PM0.39m | 3:45AM0.67m | 4:00PM0.51m | 4:26AM0.63m | 4:37PM0.68m | 5:16AM0.63m | 5:17PM0.88m | 6:17AM0.64m | 6:08PM1.08m | 7:37AM0.65m | 7:25PM1.25m | ||||||||
 | |  | | | | | |  |  | | | | | | | |  | | | | |
 | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — |
 | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | — | 7:12 | — |
mm | — | — | — | — | — | — | — | — | 3 | 3 | 1 | — | — | — | 2 | 4 | 4 | 19 | 55 | 77 | 63 |
Temp °C | 29 | 30 | 29 | 29 | 30 | 29 | 29 | 30 | 30 | 30 | 31 | 29 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 33 | 33 | 33 | 33 | 33 | 32 | 31 | 32 | 33 | 34 | 35 | 32 | 31 | 30 | 29 | 24 | 22 | 20 | 13 | 9 | 20 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SW 8 | E 16 | E 17 | E 16 | E 15 | ESE 16 | E 16 | E 18 | E 18 | E 18 | E 18 | E 19 | E 19 | E 19 | E 19 | E 16 | N 12 | N 11 | WSW 14 |
| kJ | 11 | 3 | 3 | 19 | 151 | 245 | 287 | 421 | 509 | 1075 | 1197 | 1561 | 2325 | 3999 | 9047 | 16331 | 18588 | 13992 | 4021 | 89 | 12201 |
Swell 2 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 19 | ESE 9 | SW 7 | S 7 | SW 7 | SW 7 | N 5 | NNW 5 | — | S 7 | — | — | — | — | — | E 12 | NNE 16 | E 16 |
| kJ | 6 | 6 | 6 | 29 | 8 | 2 | 1 | 2 | 2 | 18 | 8 | — | 10 | — | — | — | — | — | 529 | 83 | 5 |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 11 | E 18 | SW 8 | E 8 | S 7 | ESE 9 | S 7 | SE 8 | — | S 9 | — | — | — | — | — | — | — | N 16 | E 15 | — |
| kJ | 5 | 5 | 6 | 3 | 6 | 1 | 7 | 1 | 11 | — | 6 | — | — | — | — | — | — | — | 438 | 17 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | W 7 | N 3 | N 5 | — | — | NNE 6 | NNE 5 | NNE 5 | NNE 7 | N 9 | N 11 | NNE 14 | S 9 | SSW 13 | S 12 |
| kJ | — | — | — | — | — | — | 4 | 3 | 20 | — | — | 25 | 46 | 99 | 604 | 2827 | 8263 | 47770 | 2896 | 37973 | 6689 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1409 | 1408 | 652 | 24 | 15 | 10 | 36 | 36 | 27 | 1 | 0 | 9 | 27 | 735 | 608 | 736 | 735 | 608 | 865 | 735 | 735 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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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