Surf Forecasts:
Mainside surf forecast from 4 Jul 2026:
- Most powerful swell: Sunday 5 Jul, 3PM (local time) - 2ft (0.6m), 6s period, W swell with 27 kJ wave energy.
Best Forecast Surf Conditions for Mainside this week:
The most powerful waves expected at Mainside in the next 16 days are 0.6m 6s and forecast to arrive on Sunday (Jul 05) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 8.5m 17s period and expected on Friday (Jul 10) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3PM (Sun 5th Jul) | 2ft (0.6m) 6s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, Rusty here again, switching to feet and miles. Same story, different numbers. Mainside is the only spot, and it’s a dud for the full 16 days through July 19. Swell barely hits 1ft to 2ft, with periods of 3 to 6 seconds – total weak sauce. Combined energy tops out at 27 (weak). Water temp is 81°, which is about 3° cooler than normal – a bit chilly for the season.
Saturday the 4th and Sunday the 5th have tiny, choppy waves. Monday flat. Tuesday the 7th goes glassy but only 1ft – barely a ripple. From the 8th to the 11th, strong offshore winds up to 31 mph blow it flat or make it impossible to paddle into – more of a kite session. After that, tiny 0.7ft east swells with clean winds from the 12th onward, but energy is in the single digits. Even for a consistent reef like Mainside, there’s nothing worth paddling for. Crowds won’t be a problem because nobody’s out. This kind of dry spell is normal here when the swell direction shuts off. Keep the board in the rack. Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Sun afternoon, min 26°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Thu afternoon, min 26°C on Tue night). Winds increasing (calm on Tue morning, strong winds from the ENE by Thu night). | ||||||||||||||||||||
Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 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) | SW 3 | WSW 4 | ESE 9 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | SE 18 | ESE 18 | SE 18 | SE 17 | SE 17 | SE 18 | SSE 18 | SSE 17 | SSE 17 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 7 | 0 | 18 | 27 | 24 | 0 | 21 | 18 | 10 | 10 | 11 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross | cross-off | cross | cross-on | cross | glassy | glassy | cross-off | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | off | off |
High Tide | 9:07AM1.97m | 10:20PM1.92m | 9:53AM1.91m | 10:56PM1.91m | 10:45AM1.83m | 11:37PM1.88m | 11:48AM1.72m | 00:24AM1.86m | 1:09PM1.62m | 1:19AM1.84m | 2:50PM1.59m | 2:25AM1.85m | 4:27PM1.65m | ||||||||
Low Tide | 3:47PM0.34m | 4:08AM0.90m | 4:26PM0.44m | 4:56AM0.85m | 5:09PM0.59m | 5:52AM0.81m | 5:59PM0.76m | 6:59AM0.76m | 6:58PM0.94m | 8:16AM0.67m | 8:13PM1.08m | 9:35AM0.55m | 9:38PM1.16m | ||||||||
 | |  | | | | | | | | | | | |  |  | | |  | |  | |
 | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — |
 | — | 7:25 | — | — | 7:25 | — | — | 7:25 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 1 |
Temp °C | 27 | 27 | 27 | 27 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 30 | 29 | 31 | 31 | 31 | 31 | 31 | 30 | 31 | 33 | 32 | 31 | 29 | 29 | 28 | 28 | 30 | 29 | 27 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | ESE 9 | ESE 8 | W 5 | W 6 | W 6 | W 6 | W 6 | W 6 | ESE 14 | ESE 13 | ESE 17 | ESE 18 | SE 18 | ESE 18 | SE 18 | SE 17 | SE 17 | SE 18 | SSE 18 | SSE 17 | — |
| kJ | 15 | 14 | 11 | 18 | 27 | 24 | 18 | 21 | 115 | 192 | 622 | 1431 | 3141 | 3456 | 4963 | 6631 | 7723 | 8558 | 17805 | 39967 | — |
Swell 2 Height (m) Direction Period (s) | S 7 | S 7 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | SW 9 | ESE 16 | W 6 | W 6 | W 6 | W 6 | — | — | — | — | SSE 18 | SSE 18 | — | — | — |
| kJ | 4 | 1 | 15 | 15 | 16 | 15 | 12 | 98 | 18 | 10 | 10 | 11 | — | — | — | — | 246 | 2928 | — | — | — |
Swell 3 Height (m) Direction Period (s) | W 5 | SW 8 | SW 8 | SW 9 | SW 9 | SW 9 | ESE 8 | SW 9 | ESE 8 | ESE 18 | SW 8 | SW 8 | — | — | — | — | — | — | — | — | — |
| kJ | 2 | 2 | 2 | 3 | 3 | 13 | 14 | 12 | 14 | 120 | 11 | 3 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 3 | WSW 4 | — | — | — | — | — | — | — | — | — | — | — | — | NE 4 | — | — | — | — | SSE 17 | SSE 17 |
| kJ | 3 | 7 | — | — | — | — | — | — | — | — | — | — | — | — | 24 | — | — | — | — | 18332 | 18902 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 36 | 73 | 678 | 660 | 735 | 735 | 27 | 24 | 15 | 10 | 15 | 10 | 622 | 622 | 10 | 650 | 650 | 608 | 736 | 736 | 736 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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