Surf Forecasts:
Mainside surf forecast from 12 Nov 2026:
- Best quality surf: Friday 27 Nov, 9PM (local time) - 6ft (1.8m), 9s period, E swell with offshore winds.
- Most powerful swell: Thursday 19 Nov, 6AM (local time) - 10ft (3.0m), 9s period, NNW swell with 1,352 kJ wave energy.
- Next surfable swell (1★+): Thursday 12 Nov, 12PM (local time) - 2.5ft (0.8m), 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 Thursday (Nov 12) at 12PM. The primary swell is predicted to be 0.8m and 10s period with a secondary swell of 0.6m and 6s. Another secondary swell of 0.4m and 12s is also forecast. 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 9s and forecast to arrive on Thursday (Nov 19) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Thursday (Nov 26) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Thu 12th Nov) | 2.5ft (0.8m) 10s |
| Best Surf | 9PM (Fri 27th Nov) | 6ft (1.8m) 9s |
| Most Powerful | 6AM (Thu 19th Nov) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Short Range ForecastHeavy rain (total 22mm), heaviest during Sat night. Warm (max 25°C on Sat morning, min 21°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Tue night. Warm (max 24°C on Sun afternoon, min 22°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 12 | Friday 13 | Saturday 14 | Sunday 15 | Monday 16 | Tuesday 17 | Wednesday 18 | |||||||||||||||
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 10 | E 10 | ENE 10 | E 11 | E 10 | E 9 | E 9 | E 9 | E 11 | SW 3 | WNW 4 | N 4 | NNW 6 | N 6 | N 6 | NNW 6 | NNW 6 | SSW 4 | W 5 | NW 7 | NNW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 151 | 125 | 60 | 84 | 70 | 60 | 57 | 61 | 2 | 2 | 4 | 12 | 43 | 31 | 15 | 14 | 7 | 16 | 114 | 363 | 1032 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | on | cross-on | cross | cross-off | cross | cross-off | cross-off | off | cross | on | cross-on | cross-on |
High Tide | 8:06PM1.91m | 9:34AM1.68m | 8:34PM1.85m | 10:11AM1.63m | 9:07PM1.76m | 10:57AM1.58m | 9:46PM1.65m | 11:52AM1.54m | 10:40PM1.53m | 1:00PM1.53m | 00:03AM1.43m | 2:09PM1.56m | 1:53AM1.41m | ||||||||
Low Tide | 2:23PM0.93m | 2:58AM0.20m | 2:52PM0.99m | 3:31AM0.27m | 3:28PM1.04m | 4:08AM0.35m | 4:14PM1.08m | 4:53AM0.45m | 5:19PM1.11m | 5:50AM0.55m | 6:49PM1.09m | 7:02AM0.64m | 8:21PM0.97m | ||||||||
 | |  |  | | | | |  |  | | |  | |  | | |  |  | |  | |
 | 6:45 | — | — | 6:45 | — | — | 6:46 | — | — | 6:47 | — | — | 6:48 | — | — | 6:48 | — | — | 6:48 | — | — |
 | — | 5:39 | — | — | 5:39 | — | — | 5:39 | — | — | 5:38 | — | — | 5:38 | — | — | 5:37 | — | — | 5:37 | — |
mm | — | — | — | — | — | — | — | — | 22 | 2 | 1 | — | — | — | — | — | — | 6 | 3 | — | — |
Temp °C | 23 | 24 | 23 | 24 | 24 | 23 | 25 | 25 | 24 | 23 | 24 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 23 | 21 |
Feels °C | 21 | 23 | 21 | 25 | 25 | 23 | 24 | 25 | 25 | 23 | 23 | 22 | 23 | 22 | 23 | 25 | 25 | 24 | 22 | 18 | 15 |
Swell 1 Height (m) Direction Period (s) | N 7 | ENE 12 | ENE 10 | E 11 | E 10 | E 9 | E 9 | E 9 | E 9 | E 8 | E 8 | ESE 8 | NNW 6 | N 6 | N 6 | E 10 | ESE 10 | ESE 10 | E 10 | ESE 10 | E 10 |
| kJ | 43 | 79 | 60 | 84 | 70 | 60 | 57 | 61 | 45 | 37 | 37 | 24 | 43 | 31 | 15 | 50 | 32 | 32 | 49 | 33 | 33 |
Swell 2 Height (m) Direction Period (s) | ENE 13 | N 6 | E 10 | NNW 5 | ENE 10 | ENE 9 | — | — | E 11 | E 11 | WNW 4 | E 10 | E 8 | E 8 | E 10 | NNW 6 | NNW 6 | NNW 6 | N 7 | N 8 | — |
| kJ | 17 | 20 | 55 | 3 | 42 | 15 | — | — | 2 | 2 | 4 | 8 | 36 | 34 | 54 | 14 | 7 | 3 | 4 | 1 | — |
Swell 3 Height (m) Direction Period (s) | ENE 13 | NNW 6 | NNW 6 | E 10 | N 5 | — | — | — | — | — | — | SW 4 | — | E 10 | E 10 | SE 10 | N 6 | N 8 | NE 8 | NE 8 | — |
| kJ | 33 | 13 | 6 | 2 | 2 | — | — | — | — | — | — | 1 | — | 2 | 2 | 4 | 3 | 5 | 2 | 2 | — |
Wind waves Height (m) Direction Period (s) | E 10 | E 10 | E 4 | E 4 | — | ENE 3 | ESE 3 | SE 3 | SSE 3 | SW 3 | N 3 | N 4 | NE 3 | ENE 3 | ENE 3 | E 3 | SE 4 | SSW 4 | W 5 | NW 7 | NNW 8 |
| kJ | 151 | 125 | 6 | 9 | — | 3 | 4 | 2 | 4 | 2 | 2 | 12 | 4 | 1 | 2 | 5 | 6 | 16 | 114 | 363 | 1032 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 0 | 6 | 0 | 0 | 0 | 6 | 608 | 27 | 24 | 652 | 621 | 650 | 36 | 59 | 59 | 13 | 608 | 24 | 700 | 705 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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