Surf Forecasts:
The Island surf forecast from 18 Aug 2026:
- Best quality surf: Thursday 20 Aug, 12AM (local time) - 5ft (1.5m), 14s period, SW swell with glassy winds.
- Most powerful swell: Friday 21 Aug, 12PM (local time) - 6ft (1.8m), 17s period, SW swell with 1,927 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 12AM (local time) - 5ft (1.5m), 14s period with SW swell.
Best Forecast Surf Conditions for The Island this week:
The surf forecast for The Island over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 12AM. The primary swell is predicted to be 1.5m and 14s period with a secondary swell of 0.6m and 18s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at The Island in the next 16 days are 1.8m 17s and forecast to arrive on Friday (Aug 21) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Tuesday (Aug 18) at 3PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Thu 20th Aug) | 5ft (1.5m) 14s |
| Best Surf | 12AM (Thu 20th Aug) | 5ft (1.5m) 14s |
| Most Powerful | 12PM (Fri 21st Aug) | 6ft (1.8m) 17s |
Table - best surf conditions forecast for The Island over the next 16 days.
The Lowdown
Hey folks, Rusty here. Let’s get stuck into what’s coming up for The Island. It’s a reef break that’s consistent and exposed to SW swell, and it’s our only real option in this 16-day window. We’ve got a bit of a flat start, so hold tight.
The first real action kicks off on Tuesday, August 18th, but it’s a bit of a tease. The morning brings a 4ft SW swell with a long 17s period, but that cross-off wind from the NNE is a fresh 30 km/h, messing with the surface. The combined energy is moderate (867), but the waves are clean enough for a seasoned surfer. The afternoon goes to 3ft and the wind swings north, making it lumpy. Not our best day.
Now, Wednesday, August 19th, the swell picks up to 6ft from the WSW, but the wind is full-onshore and strong at 25 km/h. The energy is strong (2113), but the conditions are a write-off. A real shame.
Thursday, August 20th, we see a 5ft SW swell with a 16s period, and a lighter cross-shore breeze. The energy is moderate (912). It’s marginal, but a gentle morning session might be worth a look if you’re desperate.
Here’s where it gets interesting. Friday, August 21st, is a standout. The morning glass is clean with a light SSE cross-off wind at 10 km/h, and a 4ft SW swell with a 17s period. The energy is strong (1528) and the conditions are excellent for experienced surfers. The water temp is 59°F, which is about normal for this time of year. This is your window.
Saturday, August 22nd, is another cracker. A 6ft SW swell with a 16s period, and a light NE cross-off breeze at 10 km/h. The energy is strong (1681). The morning is clean and excellent for experienced surfers.
Sunday, August 23rd, the swell holds at 6ft from the SW, but the wind shifts to a cross-off from the NNE at 20 km/h. The energy is still strong (1669), but conditions are marginal. The afternoon gets messy.
Monday, August 24th, the swell drops to 4ft, and the wind is cross-shore. Not worth the paddle.
Tuesday, August 25th through Wednesday, August 26th, the swell sits around 4-4ft, but the wind is off or onshore and strong. Skip it.
Now for the second week. Thursday, August 27th sees a 7ft SW swell, but onshore wind makes it messy. Friday, August 28th is a huge standout. The swell is 8ft from the SW with a 13s period, and a light ENE cross-off breeze. The energy is very strong (2281). The morning is clean and excellent for experts only. The afternoon holds 8ft with the same conditions. This is big, powerful, and for the brave.
Saturday, August 29th, the swell is 6ft from the SW with a very long 20s period, but strong onshore winds ruin it. Same for the rest of the run into September, with the wind staying messy.
Tuesday, September 1st, the morning is glassy with a 4ft SW swell and a 17s period. The energy is moderate (701). It’s clean and inviting, but small.
The best of the whole run is Friday, August 21st morning and Friday, August 28th morning. The 21st offers clean, powerful waves for experienced surfers, and the 28th is a solid, heavy swell for the experts. If you’ve got the skills, those are the ones to aim for.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Tue afternoon, min 13°C on Tue morning). Winds decreasing (fresh winds from the NNE on Tue morning, calm by Wed night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Sun afternoon, min 12°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 17 | SW 17 | WSW 16 | WSW 15 | WSW 15 | SW 14 | SW 16 | SW 16 | SW 15 | SW 17 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 861 | 547 | 1256 | 1292 | 987 | 877 | 906 | 940 | 1135 | 841 | 1904 | 1764 | 1622 | 1363 | 1092 | 1663 | 1082 | 614 | 453 | 371 | 380 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | on | on | on | glassy | cross | on | cross-on | cross-off | cross | cross-off | cross-off | cross | off | cross-off | cross-on | glassy | cross | on | cross-on |
High Tide | 9:38PM0.00m | 11:43PM0.00m | 1:24AM0.00m | 2:52AM0.00m | 4:23AM0.00m | ||||||||||||||||
Low Tide | 8:29AM-0.00m | 10:44AM-0.00m | 12:36PM-0.00m | 2:09PM-0.00m | 3:36PM-0.00m | 5:13PM-0.00m | |||||||||||||||
 |  |  |  | |  | | | | | | | | | | | | |  | | | |
 | 7:07 | — | — | 7:07 | — | — | 7:05 | — | — | 7:05 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — |
 | — | 6:06 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — |
Temp °C | 16 | 20 | 14 | 15 | 15 | 14 | 16 | 15 | 15 | 14 | 14 | 13 | 14 | 14 | 14 | 16 | 18 | 17 | 15 | 16 | 14 |
Feels °C | 9 | 14 | 8 | 10 | 10 | 12 | 13 | 12 | 13 | 12 | 11 | 10 | 13 | 11 | 11 | 12 | 15 | 15 | 11 | 12 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SW 17 | S 17 | SW 15 | WSW 15 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 |
| kJ | 861 | 547 | 5 | 816 | 987 | 877 | 906 | 940 | 1135 | 681 | 1904 | 1764 | 1622 | 1363 | 1092 | 1663 | 1082 | 614 | 453 | 371 | 380 |
Swell 2 Height (m) Direction Period (s) | S 18 | S 18 | — | S 16 | SW 19 | SW 18 | S 17 | S 16 | SW 19 | SW 17 | S 18 | S 16 | WSW 24 | SW 21 | SW 19 | S 18 | S 16 | SW 22 | SW 20 | SW 19 | SW 18 |
| kJ | 6 | 6 | — | 5 | 181 | 258 | 6 | 5 | 432 | 841 | 6 | 5 | 54 | 285 | 446 | 6 | 5 | 18 | 61 | 177 | 246 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | S 16 | S 15 | — | — | S 16 | S 17 | — | — | S 16 | S 16 | S 15 | — | — | SW 22 | S 15 | S 14 | S 14 |
| kJ | — | — | — | — | 5 | 4 | — | — | 5 | 6 | — | — | 5 | 5 | 4 | — | — | 18 | 4 | 4 | 4 |
Wind waves Height (m) Direction Period (s) | NNE 4 | N 4 | WSW 16 | WSW 15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 4 | SW 5 |
| kJ | 19 | 16 | 1256 | 1292 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 15 | 23 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 249 | 412 | 496 | 499 | 891 | 0 | 13 | 356 | 337 | 0 | 89 | 0 | 0 | 154 | 0 | 154 | 24 | 0 | 24 | 495 | 1026 |
Best forecast wave conditions in Eyre Peninsula | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the The Island Surf forecast
The above surf forecast table for The Island provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at The Island can be found by selecting the local surf guide option on the grey menu. Our The Island 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 (The Island) 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 The Island 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.
Are you planning a holiday in Eyre Peninsula? If you are looking for accommodation near The Island, camping, hotels and holiday cottages in Eyre Peninsula, consider staying in Thevenard which is 111 km (69 miles) away.
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