Surf Forecasts:
Trespassers surf forecast from 25 Aug 2026:
- Best quality surf: Thursday 27 Aug, 9PM (local time) - 5ft (1.6m), 18s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 28 Aug, 3AM (local time) - 6ft (1.8m), 17s period, SW swell with 1,882 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 9AM (local time) - 3.5ft (1.1m), 13s 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 Wednesday (Aug 26) at 9AM. The primary swell is predicted to be 1.1m and 13s period with a secondary swell of 0.2m and 18s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Trespassers in the next 16 days are 1.8m 17s and forecast to arrive on Friday (Aug 28) at 3AM. 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 3s period and expected on Sunday (Aug 30) at 9PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Wed 26th Aug) | 3.5ft (1.1m) 13s |
| Best Surf | 9PM (Thu 27th Aug) | 5ft (1.6m) 18s |
| Most Powerful | 3AM (Fri 28th Aug) | 6ft (1.8m) 17s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright, Rusty here again. Let’s break this down in feet and miles per hour for the crew that thinks that way.
We’ve got one spot on the menu, and it’s a proper reef for the advanced guys. The first real window opens up on Friday, August 28th, and that’s where it’s at. The morning brings a clean 5ft SW groundswell with a long 16-second period, and a light offshore breeze from the NE. The water’s about average for the time of year. The combined energy is pumping hard at 1436, so there’s a ton of power in the water. This is the standout of the whole run – powerful, lined-up waves with that offshore polish. It’s a bit much for beginners, but if you’ve got the chops, this is the session to circle. The afternoon goes glassy with the wind dropping to zero, and the swell easing just a touch to 5ft, still with excellent energy (1115). Crowds are possible at this break, so get in early.
The run continues into the weekend. Saturday, August 29th offers clean 4ft SW swell in the morning with a light offshore ESE breeze, and the energy is moderate at 469. It’s a smaller, cleaner option for a fun longboard. The afternoon holds around 3ft with a cross-offshore breeze, still clean. Sunday, August 30th is smaller again, with 2ft SSW groundswell in the morning but a clean offshore breeze from the ESE. The period is a very long 20 seconds, which gives those waves great shape but also long waits between sets. The energy is still moderate (400). The afternoon picks up slightly to 3ft with a clean cross-offshore breeze.
Monday, September 1st sees a bump back up to 5ft SSW groundswell, but the wind is a cross-offshore from the NNE, keeping it clean. The energy is strong at 1471, but the wind’s not perfect. The afternoon gets a bit messier with a cross-shore breeze.
After that, it gets rough. From Tuesday, September 2nd right through to Monday, September 8th, we’re staring at a solid stretch of poor to marginal conditions. Onshore winds and choppy, bumpy seas dominate, with the odd bit of swell getting up to 6ft, but the wind is just ruining it. It’s a long gap of nothing worth paddling for.
Then, on Tuesday, September 8th, we get a late reprieve. The morning is glassy, with a clean 5ft SSW groundswell and a 17-second period. The energy is strong again at 1250. This is a promising look, but it’s two weeks out, so keep an eye on it. The afternoon turns onshore, so the window is tight.
Wednesday, September 9th and Thursday, September 10th look like they’ll be back to onshore slop, with the swell getting a bit bigger but the wind making it a mess.
So, the bottom line: don’t get your hopes up for the second week. The real gold is Friday, August 28th, with the morning session being the absolute best of the bunch. Go get some.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Thu afternoon, min 12°C on Wed morning). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 17°C on Fri night, min 11°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | ||||||||||||||
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 14 | SW 13 | SW 13 | SW 12 | SW 14 | SW 19 | SW 18 | SW 16 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | SSW 20 | SSW 19 | SSW 17 | SSW 18 | SSW 17 | SSW 16 |
Wave Graph | |||||||||||||||||||
648 | 444 | 331 | 114 | 308 | 546 | 1761 | 1436 | 1115 | 623 | 469 | 257 | 199 | 253 | 446 | 1146 | 1471 | 1367 | 853 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | cross-on | cross-off | cross | cross | cross-off | cross-off | glassy | off | off | cross-off | cross-off | off | cross-off | off | cross-off | cross | cross |
High Tide | 3:00AM0.01m | 3:00PM0.02m | 3:20AM0.01m | 3:14PM0.02m | 3:45AM0.01m | 3:26PM0.02m | 4:13AM0.01m | 3:34PM0.02m | 4:39AM0.01m | 3:48PM0.02m | 5:14AM0.01m | 3:54PM0.02m | |||||||
Low Tide | 10:36PM0.00m | 7:22AM0.00m | 10:26PM0.00m | 8:00AM0.00m | 10:24PM0.00m | 8:29AM0.00m | 10:29PM0.00m | 9:06AM0.01m | 10:35PM0.00m | 9:35AM0.01m | 10:44PM0.00m | 10:11AM0.01m | 10:54PM-0.00m | ||||||
— | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — | |
— | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 13 | 12 | 13 | 14 | 17 | 17 | 17 | 17 | 17 | 16 | 17 | 13 | 13 | 15 | 14 | 15 | 17 | 19 |
Feels °C | 10 | 10 | 9 | 10 | 10 | 14 | 14 | 14 | 16 | 14 | 14 | 15 | 10 | 11 | 13 | 11 | 11 | 13 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SW 12 | SW 14 | SW 14 | SW 18 | SW 16 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SSW 19 | SSW 17 | SSW 18 | SSW 17 | SSW 16 |
648 | 444 | 331 | 114 | 308 | 528 | 1761 | 1436 | 1115 | 623 | 469 | 257 | 199 | 147 | 446 | 1146 | 1471 | 1367 | 853 | |
Swell 2 Height (m) Direction Period (s) | SSE 4 | SSW 18 | SW 16 | SSW 15 | SW 21 | SW 19 | — | — | — | — | — | SW 23 | SW 21 | SSW 20 | SW 12 | SW 22 | — | — | — |
1 | 31 | 41 | 86 | 116 | 546 | — | — | — | — | — | 21 | 116 | 253 | 159 | 18 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | SW 24 | — | NE 3 | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | 22 | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NNW 4 | NNW 4 | — | — | — | — | ESE 2 | ESE 3 | SE 3 | ESE 3 | ESE 3 | ESE 4 | NE 3 | — | NNE 2 |
— | — | — | — | 5 | 9 | — | — | — | — | 1 | 2 | 3 | 2 | 2 | 5 | 1 | — | 1 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 13 | 0 | 14 | 0 | 17 | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 14 | 17 | 100 |
Best forecast wave conditions in Yorke Peninsula | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











