Surf Forecasts:
Trespassers surf forecast from 13 Aug 2026:
- Best quality surf: Friday 14 Aug, 9PM (local time) - 6ft (1.8m), 16s period, SSW swell with cross-offshore winds.
- Most powerful swell: Friday 14 Aug, 3AM (local time) - 6.5ft (2.0m), 16s period, SSW swell with 2,077 kJ wave energy.
- Next surfable swell (1★+): Friday 14 Aug, 9PM (local time) - 6ft (1.8m), 16s 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 Friday (Aug 14) at 9PM. The primary swell is predicted to be 1.8m and 16s 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 2.0m 16s and forecast to arrive on Friday (Aug 14) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Tuesday (Aug 18) at 6AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 14th Aug) | 6ft (1.8m) 16s |
| Best Surf | 9PM (Fri 14th Aug) | 6ft (1.8m) 16s |
| Most Powerful | 3AM (Fri 14th Aug) | 6.5ft (2.0m) 16s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright, this is Rusty comin' at ya. Let's get straight into it. We've only got one spot on the radar for the next 16 days, and that's Trespassers. It's an advanced reef break, and it's not for the faint of heart. The water temp is sitting at 59°F, which is about average for this time of year, so no surprises there.
The forecast starts with a bit of a dud. Thursday the 13th and Friday the 14th are lookin' pretty average, with a solid 6ft to 7ft SSW groundswell, but the wind's just not playing ball. It's all onshore or cross-onshore, so you're lookin' at a messy, lumpy surface. Not worth paddlin' out for unless you're desperate. The wave energy is through the roof, but it's all for nothing with that chop. Thursday afternoon has that big 6ft swell with a 15-second period, but the wind is trash.
Now, Saturday the 15th is where things start to get interesting. The swell drops a touch to 5ft to 6ft, still from the SSW with that same long 16-second period. The key change is the wind. Saturday morning we get a light cross-offshore breeze, and by the afternoon it turns pure offshore from the ESE. That reef is gonna be clean, with some proper lines comin' through. This is the best on offer early on, with clean conditions. It’s a quiet crowd situation here at Trespassers, so you might have it mostly to yourself.
Sunday the 16th through Tuesday the 18th keeps the clean conditions with offshore or cross-offshore winds, but the swell size drops to around 4ft to 4ft. The period stays long, around 14-17 seconds, so there's still plenty of push for a reef this size. It's gonna be a bit smaller, but still fun, clean waves. For a high-performance spot like this, it'll be more manageable and less of a grind.
Then we hit a rough patch from the 19th right through to the 26th of August. A full week of poor to marginal conditions. Swell tries to pick up a few times, like on the 22nd with a 7ft SW swell and the 23rd with a 8ft to 8ft SW swell, but each time the wind is howling onshore or cross-onshore, making it a complete write-off for a proper paddle session. That late August period from the 22nd to the 24th is lookin' like a kite surfer’s dream, not ours. Strong winds and a big lumpy sea.
We finally get a return to form on Thursday the 27th of August. The wind backs off, turns offshore from the E, and we get a clean 6ft SSW groundswell with a 15-second period. The forecast says "excellent surf conditions for experienced surfers," and I'm not gonna argue. That's your standout for the whole run. It's an advanced break with a decent-sized groundswell with perfect offshore wind. It's gonna be big, clean, and powerful. If you can handle it, that's the session.
After that, Friday the 28th drops right back off to a tiny 2ft to 3ft, so that's a wind-down.
So, to sum it up: don't bother with the first two days. Saturday the 15th and Thursday the 27th are your real targets. The middle of the month has some small clean surf, but the real gold is that big, clean groundswell at the end. The long periods mean it's gonna be boiling and surging over that reef, stay sharp out there.
Rusty.
Short Range ForecastMostly dry. Very mild (max 15°C on Thu night, min 12°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Tue night. Very mild (max 17°C on Tue afternoon, min 11°C on Sun night). Winds increasing (light winds from the E on Mon morning, fresh winds from the NNE by Tue night). | |||||||||||||||||||
Thu 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | ||||||||||||||
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 15 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SW 14 | SSW 14 | SW 14 | SSW 16 | SW 16 | SW 15 | SW 17 | SSW 16 | SW 16 | SW 15 | SW 15 | SW 14 |
Wave Graph | ||||||||||||||||||||
1730 | 1953 | 1832 | 1809 | 1671 | 1322 | 1098 | 711 | 614 | 553 | 463 | 683 | 729 | 489 | 687 | 469 | 255 | 269 | 309 | 541 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | cross-off | cross-off | cross-off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | on |
High Tide | 4:07AM0.01m | 3:58PM0.02m | 4:36AM0.01m | 4:09PM0.02m | 5:16AM0.01m | 4:06PM0.02m | 5:56AM0.01m | 4:06PM0.02m | 6:39AM0.01m | 3:55PM0.02m | 7:35AM0.01m | 3:32PM0.02m | ||||||||
Low Tide | 11:09PM0.00m | 8:54AM0.00m | 11:01PM0.00m | 9:35AM0.01m | 11:05PM0.00m | 10:09AM0.01m | 11:10PM0.00m | 10:39AM0.01m | 11:20PM-0.00m | 11:01AM0.01m | 11:29PM-0.00m | 11:06AM0.01m | 11:48PM-0.00m | |||||||
— | — | 7:05 | — | — | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | |
5:47 | — | — | 5:49 | — | — | 5:50 | — | — | 5:50 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | — |
Temp °C | 14 | 15 | 15 | 14 | 13 | 14 | 13 | 13 | 13 | 12 | 12 | 14 | 15 | 14 | 15 | 17 | 16 | 14 | 15 | 14 |
Feels °C | 10 | 12 | 12 | 11 | 10 | 10 | 8 | 9 | 8 | 7 | 9 | 12 | 13 | 10 | 10 | 11 | 10 | 10 | 11 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SW 14 | SSW 14 | SW 14 | SSW 16 | SW 16 | SW 15 | SW 17 | SSW 16 | SW 16 | SW 15 | SW 15 | SW 14 |
1730 | 1953 | 1832 | 1809 | 1671 | 1322 | 1098 | 711 | 614 | 553 | 463 | 683 | 729 | 489 | 687 | 469 | 255 | 269 | 309 | 541 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SW 24 | SW 22 | SSW 19 | SSW 18 | SW 13 | — | W 6 | SW 21 | SSW 19 |
— | — | — | — | — | — | — | — | — | — | — | 22 | 120 | 248 | 106 | 40 | — | 23 | 68 | 233 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NW 4 | — | NW 5 | ENE 4 | SW 19 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 10 | 2 | 58 | |
Wind waves Height (m) Direction Period (s) | W 4 | — | — | — | — | ESE 3 | ESE 4 | ESE 4 | ESE 3 | ESE 3 | ESE 4 | ESE 3 | ENE 3 | ENE 3 | ENE 5 | NNE 4 | NNE 4 | WNW 5 | W 5 | — |
10 | — | — | — | — | 1 | 9 | 8 | 2 | 3 | 5 | 1 | 1 | 4 | 19 | 10 | 12 | 27 | 21 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 67 | 160 | 14 | 13 | 13 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 0 | 0 | 79 | 100 | 19 | 14 | 11 | 13 |
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.











