Surf Forecasts:
Trespassers surf forecast from 19 Aug 2026:
- Best quality surf: Sunday 23 Aug, 9AM (local time) - 5ft (1.5m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Saturday 22 Aug, 12AM (local time) - 6ft (1.9m), 16s period, SW swell with 1,672 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 12AM (local time) - 4.5ft (1.4m), 14s 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 Sunday (Aug 23) at 12AM. The primary swell is predicted to be 1.4m and 14s period with a secondary swell of 0.8m and 19s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Trespassers in the next 16 days are 1.9m 16s and forecast to arrive on Saturday (Aug 22) at 12AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 23rd Aug) | 4.5ft (1.4m) 14s |
| Best Surf | 9AM (Sun 23rd Aug) | 5ft (1.5m) 17s |
| Most Powerful | 12AM (Sat 22nd Aug) | 6ft (1.9m) 16s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright, mate, Rusty here. Let’s look at what’s on offer.
We’ve got a bit of a rough start right now. The surf is poor, so we’re looking at a gap until the first decent window, which is Sunday, the 23rd of August. There’s a long gap before that with nothing worth paddling out for.
The standout window is Sunday morning, the 23rd of August. The swell is 5ft from the SSW with a very long period of 17 seconds – that’s a proper groundswell. The wind is light from the NNE, which is cross-offshore, giving us clean conditions. The energy is strong at 1352. This is the best bet for experienced surfers. The water temp is 58°, which is right on average for this time of year.
After that, things drop off again. Monday the 24th sees the swell fade to 3ft, and the wind goes onshore, so it’s marginal at best. Tuesday the 25th picks up to 5ft from the SW, but the wind is cross-onshore and choppy, so it’s poor. Wednesday the 26th morning has a smaller 3ft swell with clean conditions thanks to cross-offshore NNE wind, but the energy is weak at 362 – it’s just a small, clean option.
Later in the week, Thursday the 27th has a pulse of energy, with a 19-second period swell pushing 5ft and a massive 2489 energy reading, but it’s blown out by a strong NNE wind. The surf is too messy. Friday the 28th has a 7ft swell from the SW with a long period, but the wind is strong and fresh – it’s going to be big and blown out, only for experts.
Towards the end of the month and into September, the swell stays small and the wind is mostly onshore or cross-onshore, making it poor. There’s no real standout.
So, the call is clear: aim for Sunday morning, the 23rd of August. It’s the cleanest, best-shaped swell in the whole run.
Rusty.
Short Range ForecastSome drizzle, heaviest during Thu afternoon. Very mild (max 14°C on Thu morning, min 12°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 15°C on Mon morning, min 12°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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 16 | SW 16 | SW 16 | SW 14 | SW 17 | SW 16 | SW 15 | SW 15 | SW 14 | SSW 17 | SSW 16 | SW 15 | SW 14 | SSW 14 | SW 13 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1074 | 1194 | 1366 | 992 | 1643 | 1672 | 1306 | 1140 | 763 | 1352 | 843 | 496 | 297 | 236 | 406 | 1224 | 857 | 581 | 331 | 193 | 216 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | on | cross-on | on | off | cross-off | cross | glassy | on | cross-on | cross-off | cross | cross-on | cross-off | cross-off | cross | cross-off |
High Tide | 2:53PM0.02m | 2:19PM0.02m | 2:13PM0.02m | 2:21PM0.02m | 2:29PM0.02m | 2:56AM0.01m | 2:43PM0.02m | 3:00AM0.01m | 3:00PM0.02m | 3:20AM0.01m | |||||||||||
Low Tide | 00:04AM0.00m | 00:16AM0.00m | 00:18AM0.00m | 11:45PM0.00m | 11:01PM0.00m | 6:33AM0.00m | 10:36PM0.00m | 7:22AM0.00m | 10:26PM0.00m | ||||||||||||
 |  |  |  | |  | | | |  | | | | | | | | | | | | |
 | 6:58 | — | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — |
 | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:58 | — |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 14 | 14 | 14 | 15 | 15 | 13 | 13 | 13 | 13 | 12 | 12 | 13 |
Feels °C | 9 | 9 | 10 | 10 | 10 | 11 | 11 | 10 | 12 | 11 | 12 | 12 | 13 | 13 | 10 | 8 | 7 | 10 | 9 | 9 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 16 | SW 14 | SW 17 | SW 16 | SW 15 | SW 15 | SW 14 | SSW 17 | SSW 16 | SW 15 | SW 14 | SSW 14 | SW 13 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 |
| kJ | 1074 | 242 | 1366 | 992 | 1643 | 1672 | 1306 | 1140 | 763 | 1352 | 843 | 496 | 297 | 236 | 406 | 1224 | 857 | 581 | 331 | 193 | 216 |
Swell 2 Height (m) Direction Period (s) | SSW 16 | — | SW 20 | SW 18 | — | — | SSW 24 | SW 21 | SSW 19 | — | — | — | SW 20 | SW 19 | SW 18 | — | — | — | SSW 18 | SSW 17 | SSW 16 |
| kJ | 162 | — | 136 | 455 | — | — | 54 | 222 | 465 | — | — | — | 15 | 57 | 249 | — | — | — | 31 | 57 | 102 |
Swell 3 Height (m) Direction Period (s) | — | — | SW 19 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 23 |
| kJ | — | — | 130 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 21 |
Wind waves Height (m) Direction Period (s) | W 5 | SW 16 | — | — | — | — | — | — | — | — | — | — | WNW 3 | W 3 | S 3 | S 3 | — | — | — | NW 3 | — |
| kJ | 34 | 1194 | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 1 | 3 | — | — | — | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 67 | 546 | 59 | 13 | 138 | 13 | 13 | 13 | 0 | 0 | 14 | 0 | 13 | 13 | 0 | 13 | 59 | 0 | 0 | 14 | 14 |
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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