Surf Forecasts:
Trespassers surf forecast from 21 Aug 2026:
- Best quality surf: Saturday 22 Aug, 9PM (local time) - 5ft (1.6m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 27 Aug, 6PM (local time) - 6.5ft (2.0m), 19s period, SW swell with 2,743 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 9PM (local time) - 5ft (1.6m), 15s period with SW swell.
Best Forecast Surf Conditions for Trespassers this week:
The surf forecast for Trespassers over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 22) at 9PM. The primary swell is predicted to be 1.6m and 15s period with a secondary swell of 0.7m and 20s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Trespassers in the next 16 days are 2.0m 19s and forecast to arrive on Thursday (Aug 27) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Monday (Aug 24) at 9PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 22nd Aug) | 5ft (1.6m) 15s |
| Best Surf | 9PM (Sat 22nd Aug) | 5ft (1.6m) 15s |
| Most Powerful | 6PM (Thu 27th Aug) | 6.5ft (2.0m) 19s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright, Rusty here for the imperial crew. Let’s break down Trespassers, a reef slab that needs a proper SW push to get cranking.
Don’t bother paddling out on Friday or Saturday. Onshore wind and a chopped-up mess. No fun.
First clean shot is Sunday the 23rd in the morning. Wave height is around 5ft from the SW, with a light NNE cross-offshore breeze. The water is clean, the energy is solid. Not a huge day, but a smart start for the experienced surfer.
Monday the 24th is a dud. Swell drops, wind turns onshore with rain – skip it.
The first standout is Thursday the 27th in the afternoon. We’re looking at 6ft of SW swell with a 19-second period – that’s heavy groundswell. The combined energy is a burly 2929. A moderate NNE cross-offshore wind keeps the face clean. This is powerful, expert-only territory.
Then Friday the 28th morning is pure gold. 5ft from the SW, a 16-second period, and glassy conditions. The energy is 1384. It doesn’t get much cleaner. Even with a bit of light rain, the surface will be mirror-like.
The biggest standout of the whole outlook is Monday the 31st morning. Another glassy session with 5ft of SSW groundswell, a 17-second period, and a massive 1526 energy reading. Light WNW wind. If you can only surf one day, this is it. Perfect conditions for the advanced surfer.
After that, Thursday the 3rd of September morning looks good again – 6ft, clean, with a light cross-offshore breeze. Mark it, but it’s a ways out.
Water temp is about 59°F, which is normal for the season. The long-period swells (over 15 seconds) mean the waves will be powerful, hollow, and fast on this reef. Low tide is sketchy. Not a learner’s wave.
Pick your days. The 28th and the 31st are the ones to circle.
- Rusty
Short Range ForecastLight rain (total 4mm), mostly falling on Mon morning. Very mild (max 16°C on Sun night, min 12°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 18mm), heaviest on Mon afternoon. Very mild (max 15°C on Thu morning, min 12°C on Mon afternoon). Winds decreasing (fresh winds from the SSW on Mon night, light winds from the WSW by Tue night). | |||||||||||||||||||
Fri 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | ||||||||||||||
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 16 | SW 15 | SW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SSW 13 | SSW 16 | SSW 15 | SW 14 | SW 13 | SW 13 | SSW 15 | SW 21 | SW 19 | SW 17 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1643 | 1532 | 1306 | 1140 | 1045 | 1433 | 1018 | 496 | 297 | 191 | 219 | 1155 | 1087 | 742 | 437 | 277 | 144 | 467 | 2483 | 2375 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | off | cross-off | cross | cross-off | cross | cross-off | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross | cross-off | cross-off |
High Tide | 2:13PM0.02m | 2:21PM0.02m | 2:29PM0.02m | 2:56AM0.01m | 2:43PM0.02m | 3:00AM0.01m | 3:00PM0.02m | 3:20AM0.01m | 3:14PM0.02m | |||||||||||
Low Tide | 00:16AM0.00m | 00:18AM0.00m | 11:45PM0.00m | 11:01PM0.00m | 6:33AM0.00m | 10:36PM0.00m | 7:22AM0.00m | 10:26PM0.00m | 8:00AM0.00m | 10:24PM0.00m | ||||||||||
 |  |  | | | | |  |  |  |  |  | |  | | | | | | | |
 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — |
 | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:58 | — | — | 5:59 | — |
mm | — | — | — | — | — | — | — | — | 4 | 14 | 4 | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 15 | 14 | 13 | 13 | 14 | 15 | 16 | 14 | 12 | 13 | 13 | 14 | 13 | 13 | 13 | 13 | 15 | 17 | 18 |
Feels °C | 9 | 11 | 12 | 11 | 12 | 11 | 13 | 13 | 12 | 7 | 12 | 8 | 9 | 10 | 11 | 10 | 9 | 9 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SW 16 | SW 15 | SW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SSW 13 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 14 | SW 19 | SW 17 |
| kJ | 1643 | 1532 | 1306 | 1140 | 1045 | 1433 | 1018 | 496 | 297 | 191 | 219 | 897 | 836 | 742 | 437 | 277 | 112 | 331 | 2483 | 2375 |
Swell 2 Height (m) Direction Period (s) | — | — | SSW 24 | SSW 21 | SSW 19 | — | — | — | SW 20 | SW 19 | SW 18 | — | — | SW 19 | SW 18 | SW 16 | SSW 15 | SW 21 | SW 19 | — |
| kJ | — | — | 54 | 302 | 465 | — | — | — | 15 | 57 | 152 | — | — | 15 | 80 | 127 | 144 | 467 | 446 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 20 | NNW 4 | E 4 | — | — | — | — | — | SW 24 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 15 | 2 | 4 | — | — | — | — | — | 22 | — | — | — |
Wind waves Height (m) Direction Period (s) | W 4 | WSW 5 | — | — | — | — | — | — | N 3 | ENE 2 | — | SSW 16 | SSW 15 | S 4 | — | — | — | NNW 4 | — | — |
| kJ | 6 | 12 | — | — | — | — | — | — | 1 | 1 | — | 1155 | 1087 | 8 | — | — | — | 3 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 138 | 59 | 13 | 13 | 0 | 0 | 14 | 18 | 14 | 97 | 13 | 553 | 722 | 13 | 14 | 14 | 18 | 100 | 100 | 100 |
Best forecast wave conditions in Yorke Peninsula | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
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Information about the Trespassers Surf forecast
The above surf forecast table for Trespassers provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Trespassers can be found by selecting the local surf guide option on the grey menu. Our Trespassers 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 (Trespassers) 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 Trespassers 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 Yorke Peninsula? If you are looking for accommodation near Trespassers, camping, hotels and holiday cottages in Yorke Peninsula, consider staying in Kingscote which is 86 km (53 miles) away.
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