
Surf Forecasts:
Mainside surf forecast from 8 Jul 2026:
- Most powerful swell: Wednesday 15 Jul, 9AM (local time) - 1.5ft (0.5m), 9s period, E swell with 39 kJ wave energy.
Best Forecast Surf Conditions for Mainside this week:
The most powerful waves expected at Mainside in the next 16 days are 0.5m 9s and forecast to arrive on Wednesday (Jul 15) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 7.5m 17s period and expected on Saturday (Jul 11) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 9AM (Wed 15th Jul) | 1.5ft (0.5m) 9s |
Table - best surf conditions forecast for Mainside over the next 16 days.
Alright, Rusty here. Let’s have a look at what we’ve got coming down the line for Mainside. The overall picture is pretty grim for a long stretch, so don’t get your hopes up too early.
The forecast kicks off on Wednesday the 8th of July, but it’s a total non-starter. Tiny 1ft swell from the WNW with a weak period of 6 seconds, and the combined energy is only 12 – that’s barely a ripple. The wind is cross-off, but with surf that small, it’s just a flat, clean lake. This poor excuse for surf carries on right through the rest of the week and into the weekend. There’s a big chunk of nothing from Thursday the 9th all the way through to Monday the 13th, with zero swell showing up. The wind gets nasty, too – we’re looking at near gale to severe gale force offshore winds from the 10th to the 11th, which would be ridiculous to even think about paddling into. The water temp is sitting at 83°, which is about normal for the time of year, not that it matters with no waves.
Things finally try to wake up on Thursday the 16th of July. The morning shows a 4ft swell from the east at 10 seconds, with combined energy climbing to a moderate 290. The wind is cross-off from the ENE at 12 mph, keeping it clean. The break at Mainside is a reef setup and exposed to northerly swells, so this east swell isn’t hitting it perfectly, but it might offer a few okay ones. Still, it’s marginal, and the score reflects that. The afternoon drops off into a shorter period swell and weaker energy.
Friday the 17th of July morning is small again – 3ft from the ENE – but the wind goes light at 6 mph, cross-off, keeping it glassy. It’s surfable but very ordinary. The afternoon pulls in a 3ft swell from the north with a short 6-second period, but the wind turns offshore from the ESE at just 3 mph. This north swell is right in the optimum direction for Mainside, which is a positive, but the period is so short the waves will lack punch. The combined energy is a weak 112.
After that, we slip back into another quiet run from the 18th onward. There are small bits of swell here and there, but nothing that really breaks the 3ft mark with any quality. Even later in the forecast around the 22nd of July, we see a 2ft east swell with a decent 12-second period giving a combined energy of 177 (moderate), but it’s still just surfable, not exciting.
To be honest, the only standout in this whole 16-day stretch is Thursday morning the 16th of July. The 4ft east swell with a 10-second period offers the most size and push, and the conditions will be clean with that cross-off breeze. It’s not pumping, but it’s the best of a bad bunch. Mainside is a consistent reef break, but it might be worth checking if the banks are holding. Don’t expect much else.
Stay patient.
Rusty.
Short Range ForecastModerate rain (total 16mm), heaviest on Fri afternoon. Warm (max 30°C on Thu afternoon, min 27°C on Wed morning). Winds increasing (light winds from the ENE on Wed morning, gales from the ESE by Fri night). | Days 4-6 Weather SummaryHeavy rain (total 93mm), heaviest during Mon morning. Warm (max 29°C on Sat afternoon, min 27°C on Sun night). Winds decreasing (gales from the SE on Sat morning, light winds from the E by Mon night). | ||||||||||||||||||||
Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | |||||||||||||||
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) | WNW 6 | WNW 7 | SE 16 | SE 16 | SE 17 | SE 18 | SE 18 | SSE 18 | SSE 18 | SSW 17 | SSW 16 | SW 15 | SSE 11 | SSE 11 | SSE 10 | W 9 | W 9 | E 9 | S 9 | S 8 | ESE 12 |
Wave Graph | |||||||||||||||||||||
12 | 20 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 6 | 7 | 0 | 0 | 0 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | cross-off |
High Tide | 1:09PM1.62m | 1:19AM1.84m | 2:50PM1.59m | 2:25AM1.85m | 4:27PM1.65m | 3:33AM1.89m | 5:40PM1.76m | 4:38AM1.97m | 6:35PM1.88m | 5:35AM2.07m | 7:21PM1.97m | 6:27AM2.15m | 8:01PM2.04m | ||||||||
Low Tide | 6:58PM0.94m | 8:16AM0.67m | 8:13PM1.08m | 9:35AM0.55m | 9:38PM1.16m | 10:45AM0.39m | 10:55PM1.17m | 11:45AM0.23m | 11:57PM1.12m | 12:36PM0.11m | 00:48AM1.04m | 1:22PM0.04m | 1:34AM0.95m | ||||||||
5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | |
— | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:23 | — | — | 7:23 | — | |
mm | — | — | — | 1 | — | — | 1 | 6 | 8 | 5 | 1 | — | 1 | 6 | 25 | 31 | 19 | 5 | — | — | 2 |
Temp °C | 28 | 29 | 28 | 29 | 30 | 29 | 29 | 28 | 29 | 28 | 29 | 29 | 29 | 29 | 28 | 27 | 28 | 28 | 29 | 30 | 28 |
Feels °C | 30 | 31 | 29 | 29 | 30 | 28 | 25 | 23 | 22 | 20 | 24 | 26 | 29 | 30 | 28 | 26 | 30 | 30 | 31 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | ESE 16 | SE 16 | SE 16 | SE 16 | SE 17 | SE 18 | — | SSE 18 | — | SSW 17 | SSW 16 | SW 15 | SW 13 | SW 12 | SW 10 | SW 10 | SSE 9 | S 9 | S 9 | S 8 | ESE 12 |
1371 | 1988 | 2761 | 4348 | 6182 | 8904 | — | 16507 | — | 30650 | 6832 | 5150 | 1223 | 524 | 120 | 60 | 248 | 130 | 76 | 66 | 138 | |
Swell 2 Height (m) Direction Period (s) | WNW 6 | — | — | — | — | SSE 18 | — | — | — | — | — | — | — | SE 13 | WSW 10 | W 9 | SW 9 | SW 10 | SW 10 | SW 11 | S 8 |
12 | — | — | — | — | 3162 | — | — | — | — | — | — | — | 7 | 35 | 15 | 41 | 46 | 36 | 43 | 47 | |
Swell 3 Height (m) Direction Period (s) | SE 17 | — | — | — | — | — | — | — | — | — | — | — | — | — | SE 13 | E 9 | W 9 | E 9 | ESE 14 | ESE 13 | SW 11 |
73 | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | 2 | 6 | 7 | 19 | 62 | 42 | |
Wind waves Height (m) Direction Period (s) | — | WNW 7 | — | — | ENE 5 | — | SE 18 | ESE 9 | SSE 18 | S 17 | SSE 13 | SSE 12 | SSE 11 | SSE 11 | SSE 10 | SSE 9 | ESE 4 | E 3 | E 6 | E 6 | — |
— | 20 | — | — | 66 | — | 22897 | 2093 | 29197 | 26797 | 6225 | 2689 | 1381 | 1022 | 636 | 359 | 7 | 8 | 15 | 11 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 10 | 10 | 10 | 650 | 650 | 608 | 736 | 1014 | 736 | 736 | 1043 | 618 | 618 | 622 | 618 | 600 | 600 | 14 | 14 | 14 | 10 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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.










