Surf Forecasts:
Trespassers surf forecast from 30 Aug 2026:
- Best quality surf: Monday 31 Aug, 12PM (local time) - 5ft (1.5m), 18s period, SSW swell with cross-offshore winds.
- Most powerful swell: Saturday 5 Sep, 12AM (local time) - 8ft (2.4m), 15s period, SW swell with 2,425 kJ wave energy.
- Next surfable swell (1★+): Monday 31 Aug, 12AM (local time) - 4.5ft (1.3m), 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 12AM. The primary swell is predicted to be 1.3m and 17s period with a secondary swell of 0.4m and 21s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Trespassers in the next 16 days are 2.4m 15s and forecast to arrive on Saturday (Sep 05) at 12AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Sunday (Sep 06) at 9PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Mon 31st Aug) | 4.5ft (1.3m) 17s |
| Best Surf | 12PM (Mon 31st Aug) | 5ft (1.5m) 18s |
| Most Powerful | 12AM (Sat 5th Sep) | 8ft (2.4m) 15s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright, Rusty here. Let's break down the next couple of weeks.
We've got a good run of swell coming into Trespassers, but we'll have to sit through some rough weather first. The first surf is this Sunday afternoon, the 30th of August, with a clean 3-foot SSW swell. The water’s about 59°, which is normal for the season. Then Monday the 31st is looking sweet. The morning brings a building 4-foot SSW swell, and by the afternoon we’re looking at 5 feet from the same direction. The wind is light, cross-off, keeping it clean. The wave energy is strong. This is a standout period for the experienced crew – the waves are going to have some power.
Then the weather goes south. From Tuesday the 1st of September through to the 6th, we've got onshore winds and lumpy conditions. The swell sticks around, but the quality drops off a cliff. It’s a long stretch of poor surf, not worth paddling out for. The wind is just too messy.
After that dry spell, things start to look up again. The morning of Thursday the 10th of September is a real highlight. We’ve got an 8-foot SW groundswell, a very long period of 16 seconds, and… glassy conditions. Calm wind, zero from the east. The wave energy is massive. This is a powerful, clean, long-period swell. It’s a lot of water moving, so Trespassers, being a reef, should handle it well. This is definitely one for the experts – too big for beginners.
Saturday the 12th of September morning is another glassy moment, with a 5-foot SW swell and a solid 16-second period. Clean, calm, and a bit more manageable.
But the absolute best on offer is Sunday the 13th of September. The afternoon is looking flawless. An 8-foot SW swell, long period at 16 seconds, and a light cross-off breeze. The wave energy is a massive 4169. This is the kind of session you dream about – powerful, clean, and all to yourself if you’re lucky. The wind is perfect, the swell direction is what Trespassers loves, and the energy is through the roof. If you can only paddle out once in this whole forecast, make it Sunday the 13th.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Mon night, min 13°C on Sun night). Winds increasing (light winds from the ESE on Sun afternoon, fresh winds from the NNW by Tue morning). | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Fri morning. Very mild (max 17°C on Fri afternoon, min 12°C on Fri night). Winds increasing (light winds from the NW on Thu night, gales from the WNW by Fri night). | |||||||||||||||||||
Sun 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | ||||||||||||||
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 19 | SSW 17 | SSW 16 | SSW 18 | SSW 16 | SW 16 | SSW 14 | SW 15 | SSW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SSW 15 | SW 15 | SSW 15 | SW 15 | WSW 15 | SW 14 | SW 14 |
Wave Graph  | ||||||||||||||||||||
 kJ | 312 | 911 | 749 | 1399 | 957 | 551 | 268 | 537 | 632 | 1077 | 1594 | 1324 | 1311 | 1907 | 1415 | 1190 | 2425 | 2119 | 1604 | 1349 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross-off | cross-off | cross | on | cross-on | on | on | on | on | on | cross | cross-off | cross | on | cross-on | cross-on | glassy |
High Tide | 5:14AM0.01m | 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 | ||||||||||
Low Tide | 10:44PM0.00m | 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 | |||||||||
 |  | | | |  | |  | | |  |  |  | |  | |  | | | | |
 | — | — | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:37 | — | — | 6:37 | — | — |
 | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:02 | — | — | 6:04 | — | — | 6:04 | — | — | 6:05 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | 3 | 3 | 1 | — | — | — |
Temp °C | 16 | 14 | 16 | 17 | 18 | 17 | 18 | 14 | 13 | 14 | 14 | 14 | 15 | 15 | 16 | 17 | 15 | 12 | 12 | 13 |
Feels °C | 13 | 11 | 13 | 13 | 14 | 12 | 13 | 10 | 8 | 8 | 8 | 10 | 13 | 14 | 7 | 9 | 4 | 2 | 5 | 10 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | SSW 17 | SSW 16 | SSW 18 | SSW 16 | SW 16 | SSW 14 | SW 15 | SSW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SSW 15 | SW 15 | SSW 15 | SSW 15 | WSW 15 | SW 14 | SW 14 |
| kJ | 202 | 911 | 749 | 1399 | 957 | 551 | 268 | 537 | 632 | 1077 | 1594 | 1324 | 1311 | 1907 | 1415 | 1190 | 348 | 2119 | 1604 | 1349 |
Swell 2 Height (m) Direction Period (s) | SSW 19 | SW 21 | SSW 19 | SW 18 | — | SSW 20 | SW 18 | SW 15 | — | — | — | — | — | — | — | — | E 5 | SW 14 | — | SW 18 |
| kJ | 312 | 117 | 480 | 152 | — | 38 | 252 | 139 | — | — | — | — | — | — | — | — | 1 | 169 | — | 12 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | NE 5 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ESE 3 | SE 3 | ENE 3 | — | NNE 2 | NNW 5 | W 6 | WSW 5 | WSW 6 | WSW 4 | WSW 6 | W 8 | — | — | N 3 | NNW 5 | SW 15 | SW 15 | — | — |
| kJ | 1 | 2 | 2 | — | 1 | 54 | 64 | 25 | 28 | 26 | 94 | 186 | — | — | 8 | 69 | 2425 | 1776 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 100 | 1186 | 160 | 546 | 546 | 546 | 498 | 498 | 14 | 14 | 651 | 651 | 1095 | 1260 | 1268 | 0 |
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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