Surf Forecasts:
Trespassers surf forecast from 31 Aug 2026:
- Best quality surf: Monday 31 Aug, 6PM (local time) - 5ft (1.5m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Saturday 5 Sep, 3PM (local time) - 10ft (3.0m), 17s period, SW swell with 4,550 kJ wave energy.
- Next surfable swell (1★+): Monday 31 Aug, 6PM (local time) - 5ft (1.5m), 17s period with SSW 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 Monday (Aug 31) at 6PM. The primary swell is predicted to be 1.5m and 17s period. 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 3.0m 17s and forecast to arrive on Saturday (Sep 05) at 3PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Sunday (Sep 06) at 12PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Mon 31st Aug) | 5ft (1.5m) 17s |
| Best Surf | 6PM (Mon 31st Aug) | 5ft (1.5m) 17s |
| Most Powerful | 3PM (Sat 5th Sep) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright, let’s talk about this stretch in the water. One spot, Trespassers, and it’s a proper reef. The first real window is Monday, the 31st of August. The swell is a clean 4ft to 5ft, pulsing in from the SSW, with a very long 16 to 18-second period. That’s heavy groundswell, full of power (combined energy of 1229 to 1551). The wind is a gentle cross-off in the morning, staying okay for the afternoon. This is as good as it gets for a slab like this. Water temp is about normal for the time of year.
Now, from Tuesday the 1st of September, things get ugly. A strong northerly wind blows up, and the swell drops. The whole week through to the 7th is a write-off. Onshore winds, rain, lumpy, poor surf. The swell gets a bit bigger around the 3rd and 5th, but with the wind straight onshore, it’s a messy, chunky wall. That’s kite-surfing weather, not for a paddle.
We get a little clean-up on the 6th with a smaller breeze, but the energy is low (820) and the quality is just okay.
The real magic for the experienced crew is in the second week. The 9th of September, Wednesday morning, is a standout. We’re looking at a solid 8ft SSW groundswell, with a very long 19-second period. The wind is a light cross-off, and the forecast is excellent for experienced surfers. The combined energy is a massive 4363. That’s a serious, powerful wave. The afternoon glass off with zero wind, with a 7ft wave, is even better for the heart. This is big, powerful, and for experts only.
The 10th and 11th of September keep that good form with clean 6ft to 7ft SSW groundswell and glassy conditions. The 13th of September also looks epic, with a 6ft SW groundswell and offshore winds, going glassy in the afternoon. That’s a solid run of quality.
But remember, this is a long-range call. The 14th of September shows a big 7ft to 8ft swell, but the wind is cross-shore, creating a bit of chop. The 15th turns onshore again. So, the real highlights are the 9th and the 10th for the best waves, but you need to be a pro to handle that size and power.
Stay safe out there.
Rusty
Short Range ForecastMostly dry. Very mild (max 19°C on Tue afternoon, min 13°C on Mon morning). Winds increasing (light winds from the N on Mon afternoon, fresh winds from the N by Tue morning). | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Thu morning. Very mild (max 17°C on Fri morning, min 12°C on Fri night). Winds increasing (light winds from the N on Thu night, strong winds from the WSW by Fri night). | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | |||||||||||||||
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) | SSW 16 | SSW 18 | SSW 16 | SW 16 | SSW 14 | SW 15 | SSW 15 | SSW 14 | SSW 14 | SW 14 | SW 14 | SSW 15 | SSW 15 | SW 15 | SW 15 | SW 16 | SW 17 | SW 16 | SW 15 | SW 14 | SW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 749 | 1399 | 957 | 551 | 268 | 537 | 632 | 701 | 774 | 1680 | 1494 | 2043 | 1809 | 1650 | 1632 | 3021 | 4550 | 3278 | 1466 | 731 | 2536 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross | cross | cross-on | cross-on | on | on | on | on | on | cross-off | cross | cross-on | on | on | on | cross-on | cross-off | cross | cross-on |
High Tide | 3:54PM0.02m | 5:49AM0.02m | 3:49PM0.02m | 6:29AM0.02m | 3:39PM0.02m | 7:24AM0.02m | 2:55PM0.02m | 1:32PM0.02m | 1:17PM0.02m | 1:36PM0.02m | |||||||||||
Low Tide | 10:11AM0.01m | 10:54PM-0.00m | 10:42AM0.01m | 11:05PM-0.00m | 11:10AM0.01m | 11:12PM-0.00m | 11:30AM0.01m | 11:26PM-0.00m | 11:34PM-0.00m | 11:35PM0.00m | 11:24PM0.00m | ||||||||||
 | |  |  | |  | |  |  |  | | |  | |  | | | | |  | | |
 | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — |
 | — | 6:00 | — | — | 6:01 | — | — | 6:02 | — | — | 6:04 | — | — | 6:04 | — | — | 6:05 | — | — | 6:06 | — |
mm | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | 1 | 1 | — | — | — | — | 13 | 8 |
Temp °C | 15 | 17 | 18 | 18 | 19 | 14 | 14 | 14 | 15 | 15 | 15 | 14 | 17 | 17 | 16 | 13 | 13 | 13 | 17 | 17 | 12 |
Feels °C | 11 | 13 | 13 | 12 | 15 | 11 | 9 | 8 | 10 | 12 | 12 | 13 | 12 | 13 | 10 | 5 | 7 | 9 | 9 | 9 | -1 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 18 | SSW 16 | SW 16 | SSW 14 | SW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SW 14 | SSW 15 | SSW 15 | SW 15 | SSW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | — |
| kJ | 749 | 1399 | 957 | 551 | 268 | 537 | 632 | 701 | 774 | 493 | 1494 | 2043 | 1809 | 1650 | 474 | 623 | 4550 | 3278 | 1466 | 731 | — |
Swell 2 Height (m) Direction Period (s) | SSW 19 | SW 18 | — | ENE 4 | SW 18 | WNW 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | ENE 4 | — |
| kJ | 480 | 152 | — | 2 | 252 | 91 | — | — | — | — | — | — | — | — | — | — | — | — | — | 11 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | SSW 20 | NNE 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | N 5 | — |
| kJ | — | — | — | 38 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 19 | — |
Wind waves Height (m) Direction Period (s) | ENE 3 | — | NNE 2 | NNW 4 | WNW 5 | WSW 5 | WSW 5 | WSW 5 | WSW 6 | SW 14 | WSW 13 | — | N 3 | WNW 5 | SW 15 | SW 16 | — | — | NE 4 | NW 5 | SW 11 |
| kJ | 1 | — | 1 | 39 | 19 | 17 | 30 | 35 | 170 | 1680 | 816 | — | 3 | 20 | 1632 | 3021 | — | — | 8 | 47 | 2536 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 14 | 100 | 1186 | 17 | 546 | 595 | 546 | 499 | 498 | 14 | 0 | 651 | 732 | 1192 | 1276 | 1331 | 14 | 162 | 138 | 339 |
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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