
Surf Forecasts:
Trespassers surf forecast from 20 Jul 2026:
- Most powerful swell: Thursday 23 Jul, 3PM (local time) - 6ft (1.9m), 15s period, SSW swell with 1,592 kJ wave energy.
Best Forecast Surf Conditions for Trespassers this week:
The most powerful waves expected at Trespassers in the next 16 days are 1.9m 15s and forecast to arrive on Thursday (Jul 23) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 3PM (Thu 23rd Jul) | 6ft (1.9m) 15s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright, folks, Rusty here, looking at the waves at Trespassers for the next couple of weeks.
Gotta be honest, this is a tough one to call. Most of the time, the wind is just gonna mess it up. The first time you might even think about getting wet is Monday the 20th, but it’s only a maybe. There’s a 4ft SW swell with a super long period of 15 seconds, and the energy is moderate (538). The problem is the cross-shore wind is putting a little chop on it. Not a total loss, but not a day to write home about.
The next few days are rough. Tuesday the 21st and Wednesday the 22nd are all cross-on winds, making it choppy and messy. The swell is there, but it’s not clean. By Thursday the 23rd morning, the energy jumps up to 2456—that’s very strong—with a 6ft SSW swell and a 14-second period. But again, the wind is cross-shore with a cross-chop. It’s big and powerful, but not the kind of power you want to deal with in messy conditions.
We then hit a long stretch from Friday the 24th all the way to Wednesday the 29th of July where every session is rated poor. The wind is almost always onshore or cross-on, and the sea is choppy or lumpy. There’s a big spike on Tuesday the 28th with a 7ft to 8ft SW swell and a very long period of 19 seconds, so the energy is very strong (2841), but it’s blowing 30 km/h from the NNW and NW—fresh cross-onshore. That’s a big, lumpy mess. For a reef like Trespassers, that’s a pass unless you’re an expert looking for a fight.
The light at the end of the tunnel comes as we head into the end of July. Friday the 31st of July morning shows a clean, cross-off wind from the NE at 15 km/h. The swell is small, only 3ft from the SSW, with a 13-second period and combined energy of 232 (weak to moderate). The afternoon is similar, still clean. It’s tiny, but it’s the most surfable thing we’ve seen in a week.
The best of the bunch, if you can call it that, is Tuesday the 4th of August. The morning session has a clean cross-off breeze from the north, a 2ft SW swell, and a very long period of 18 seconds. That’s proper groundswell energy, and for a reef, that long period could make for some nice, lined-up waves. The energy is weak (338), so it won’t be pumping, but it’ll be clean. The afternoon is also clean with a gentle cross-shore and a 2ft SSW swell. For the second week, this is as good as it gets—small, clean, and a little hope.
Crowds at Trespassers can show up sometimes, so you might have some company on those cleaner days.
All in all, this is a waiting game. The first week is mostly a write-off with onshore wind. The second week gives you a few cleaner, smaller windows, with the 31st of July and the 4th of August being your best bets. There’s a lot of energy in the water at times, but the wind is the boss here. We just gotta wait for it to calm down.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue night. Very mild (max 15°C on Mon afternoon, min 11°C on Wed night). Winds increasing (light winds from the NNW on Tue night, fresh winds from the SSW by Wed night). | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Fri night. Very mild (max 15°C on Sun morning, min 11°C on Thu afternoon). Wind will be generally light. | |||||||||||||||||||
Mon 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | ||||||||||||||
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 | SW 14 | SW 13 | SW 12 | SW 12 | SSW 14 | SW 12 | SW 14 | SW 15 | SSW 15 | SSW 16 | SSW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 12 | SW 11 | SW 12 |
Wave Graph | ||||||||||||||||||||
535 | 639 | 437 | 306 | 240 | 121 | 520 | 988 | 1244 | 1592 | 1460 | 1042 | 869 | 589 | 509 | 486 | 373 | 303 | 250 | 137 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 4:48PM0.02m | 8:59AM0.01m | 4:19PM0.02m | 3:25PM0.02m | 2:38PM0.02m | 2:30PM0.02m | 2:42PM0.02m | 2:59PM0.02m | 2:07AM0.00m | |||||||||||
Low Tide | 00:33AM0.00m | 10:05AM0.01m | 00:47AM0.00m | 1:05AM0.00m | 1:20AM0.00m | 1:51AM0.00m | 5:03AM0.00m | 00:09AM0.00m | ||||||||||||
— | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | |
5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:32 | — | — | 5:34 | — | — | 5:34 | — | — | 5:35 | — | |
mm | — | — | — | — | 1 | 1 | 1 | — | — | — | — | — | — | 1 | — | 1 | 3 | 1 | — | — |
Temp °C | 15 | 15 | 15 | 15 | 15 | 14 | 13 | 12 | 11 | 12 | 12 | 12 | 12 | 14 | 14 | 14 | 14 | 15 | 14 | 14 |
Feels °C | 12 | 12 | 12 | 13 | 14 | 7 | 7 | 5 | 4 | 6 | 7 | 7 | 6 | 10 | 10 | 9 | 9 | 11 | 10 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 14 | SW 13 | SW 12 | SW 12 | SSW 14 | SSW 11 | SW 14 | SW 15 | SSW 15 | SSW 16 | SSW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 12 | SW 11 | SW 12 |
535 | 639 | 437 | 306 | 240 | 121 | 51 | 928 | 1212 | 411 | 1460 | 1042 | 869 | 589 | 509 | 486 | 373 | 303 | 250 | 137 | |
Swell 2 Height (m) Direction Period (s) | NNE 3 | — | — | — | SW 15 | SW 11 | SW 15 | — | — | — | — | — | — | — | SW 13 | S 18 | SSW 12 | SW 16 | SSW 15 | SW 15 |
1 | — | — | — | 34 | 55 | 54 | — | — | — | — | — | — | — | 42 | 6 | 56 | 10 | 22 | 55 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 18 | — | SW 16 | — | — | SSW 15 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 | — | 10 | — | — | 21 | |
Wind waves Height (m) Direction Period (s) | WNW 4 | — | N 2 | WNW 3 | — | WSW 5 | SW 12 | SW 14 | SSW 14 | SSW 15 | — | — | WSW 4 | WSW 5 | WSW 5 | WSW 6 | — | WSW 5 | NW 3 | W 6 |
3 | — | 1 | 1 | — | 32 | 520 | 988 | 1244 | 1592 | — | — | 11 | 17 | 23 | 23 | — | 19 | 4 | 53 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 14 | 2 | 14 | 14 | 14 | 731 | 722 | 722 | 722 | 1193 | 13 | 344 | 499 | 499 | 499 | 546 | 160 | 160 | 553 | 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.










