Surf Forecasts:
Trespassers surf forecast from 18 Jul 2026:
- Best quality surf: Monday 20 Jul, 9PM (local time) - 4.5ft (1.3m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 23 Jul, 3PM (local time) - 6ft (1.9m), 16s period, SSW swell with 1,721 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 9PM (local time) - 4.5ft (1.3m), 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 Monday (Jul 20) at 9PM. The primary swell is predicted to be 1.3m and 14s period with a secondary swell of 0.7m and 10s. 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 1.9m 16s 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+) | 9PM (Mon 20th Jul) | 4.5ft (1.3m) 14s |
| Best Surf | 9PM (Mon 20th Jul) | 4.5ft (1.3m) 14s |
| Most Powerful | 3PM (Thu 23rd Jul) | 6ft (1.9m) 16s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cooking for the next couple of weeks.
Honestly, it’s a rough start. The first week and a half looks like a write-off for any decent surf. The wind is just never on our side, and the swell is either too small or too messy. We’re looking at a solid run of poor conditions from the get-go, with nothing worth paddling out for. The wind is mostly cross or cross-onshore, making a mess of things. There’s a bit of a bump in size around Thursday the 23rd with some 5.6ft swell from the SSW, but the wind is still cross and the conditions are just marginal at best. It’s not until the very end of the period that things start to turn around.
After a long, frustrating stretch, we finally get a glimmer of hope. The standout window is the very end of the forecast, around the 2nd and 3rd of August. The only spot on the menu is Trespassers, a reef break that’s fairly consistent and handles a SSW swell. The water temp is about average for the time of year, nothing out of the ordinary.
The real magic happens on Sunday, August 2nd. The morning sees a clean 2ft SSW groundswell, with a very long period of 21 seconds, and a light cross-offshore breeze. The wave energy is moderate (413). But the afternoon is the real gem: glassy conditions, with the wind dropping to just 3 mph from the SE. The swell is a clean 2.3ft from the SSW, with a long period of 19 seconds and moderate energy (451). This is the best on offer – clean, lined-up waves for those who know how to handle a reef break. Keep in mind, with a long period groundswell like that, it’ll be fat and straight at a beach break, but at a reef like Trespassers, it should be a thing of beauty. Just be aware that crowds are possible here.
Monday the 3rd of August also looks promising. The morning kicks off with a clean 2.6ft SSW swell, a 17-second period, and a light cross-offshore breeze. The energy is moderate (469). It’s a great follow-up to the glassy Sunday, but don’t expect it to be as perfect.
Short Range ForecastSome drizzle, heaviest during Tue night. Very mild (max 16°C on Sun night, min 13°C on Sun morning). Winds increasing (light winds from the N on Mon afternoon, fresh winds from the W by Tue night). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Wed morning. Very mild (max 14°C on Fri night, min 10°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | |||||||||||||||
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 20 | SW 18 | SW 16 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 11 | SW 12 | SSW 14 | SW 14 | SSW 16 | SSW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 120 | 252 | 498 | 427 | 535 | 706 | 437 | 352 | 277 | 445 | 590 | 1109 | 1307 | 1721 | 1288 | 1020 | 978 | 816 | 680 | 659 | 528 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-on | cross-off | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on |
High Tide | 5:01PM0.02m | 7:05AM0.01m | 4:48PM0.02m | 8:59AM0.01m | 4:19PM0.02m | 3:25PM0.02m | 2:38PM0.02m | 2:30PM0.02m | 2:42PM0.02m | ||||||||||||
Low Tide | 10:23AM0.01m | 00:17AM0.00m | 10:39AM0.01m | 00:33AM0.00m | 10:05AM0.01m | 00:47AM0.00m | 1:05AM0.00m | 1:20AM0.00m | 1:51AM0.00m | ||||||||||||
 |  |  |  | |  | | |  |  |  |  | | | | | | | | | | |
 | 7:26 | — | — | 7:26 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:22 | — | — | 7:22 | — | — |
 | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:32 | — | — | 5:34 | — | — | 5:34 | — |
mm | — | — | — | — | — | — | — | — | 1 | 1 | 1 | 1 | — | — | — | — | — | — | 2 | — | 1 |
Temp °C | 13 | 15 | 16 | 14 | 15 | 15 | 14 | 15 | 15 | 13 | 12 | 12 | 11 | 11 | 12 | 12 | 13 | 14 | 14 | 14 | 13 |
Feels °C | 9 | 11 | 12 | 10 | 12 | 12 | 11 | 12 | 12 | 6 | 5 | 6 | 6 | 6 | 7 | 6 | 7 | 9 | 9 | 9 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 12 | WSW 12 | SW 16 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 14 | SW 12 | SW 14 | SW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SW 14 | SW 13 | SSW 13 | SW 12 |
| kJ | 120 | 115 | 498 | 427 | 535 | 706 | 437 | 352 | 277 | 52 | 112 | 1109 | 1307 | 1721 | 1288 | 239 | 180 | 816 | 680 | 109 | 528 |
Swell 2 Height (m) Direction Period (s) | SW 20 | SW 18 | W 7 | W 4 | WNW 4 | — | — | — | SW 15 | — | SW 15 | — | — | — | — | — | — | — | S 18 | S 18 | — |
| kJ | 97 | 252 | 35 | 1 | 6 | — | — | — | 34 | — | 54 | — | — | — | — | — | — | — | 6 | 6 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 2 | NNW 3 | N 3 | N 4 | — | — | — | — | NW 3 | SW 11 | SW 12 | SSW 14 | SW 14 | — | — | SW 15 | SW 14 | WSW 5 | WSW 5 | SW 13 | WSW 5 |
| kJ | 1 | 3 | 2 | 1 | — | — | — | — | 2 | 445 | 590 | 1065 | 1267 | — | — | 1020 | 978 | 34 | 39 | 659 | 32 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 17 | 19 | 14 | 17 | 14 | 14 | 14 | 14 | 14 | 731 | 742 | 732 | 13 | 59 | 13 | 13 | 13 | 14 | 14 | 14 |
Best forecast wave conditions in Yorke Peninsula | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Trespassers surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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