Surf Forecasts:
Trespassers surf forecast from 11 Sep 2026:
- Best quality surf: Friday 11 Sep, 3PM (local time) - 4.5ft (1.3m), 16s period, SSW swell with cross-offshore winds.
- Most powerful swell: Sunday 13 Sep, 6PM (local time) - 6ft (1.9m), 16s period, WSW swell with 1,684 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 3PM (local time) - 4.5ft (1.3m), 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 (Sep 11) at 3PM. The primary swell is predicted to be 1.3m 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 1.9m 16s and forecast to arrive on Sunday (Sep 13) at 6PM. Winds are predicted to be 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 (Sep 15) at 6PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Fri 11th Sep) | 4.5ft (1.3m) 16s |
| Best Surf | 3PM (Fri 11th Sep) | 4.5ft (1.3m) 16s |
| Most Powerful | 6PM (Sun 13th Sep) | 6ft (1.9m) 16s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright, let's talk about Trespassers in feet and miles per hour, 'cause that's how we roll. Over these 16 days it's a tale of two weeks, and the first one is where the action is.
Water temp is sitting at 59°F, which is about what you'd expect for this time of year, so no weird thermocline surprises.
The main event kicks off Friday, September 11th. The morning is a beauty: a chest-high 4ft swell from the SSW with a long 15-second interval. The energy is moderate (674), but the wind is a gentle offshore breeze – glassy perfection for a reef. That's your morning session locked in. The afternoon holds the same size with a 16-second period and even more energy (859). Pure stoke.
Saturday the 12th is still a go. Morning has a 4ft SSW swell with a cross-offshore wind, and the afternoon cleans up with a 4ft SW swell. Not as clean as Friday but surfable.
Then the wheels come off. Sunday the 13th through Thursday the 17th is mostly messy. Sunday is a total loss with a 35 km/h cross-onshore wind and lumpy water. Monday and Tuesday have cross-chop, and even though Tuesday sees a solid 6ft to 7ft swell (energy hits 3118), the cross-shore wind keeps it marginal for a reef. You'll have to pick your moment.
Wednesday the 16th is a second major highlight. Morning brings a solid 6ft SSW swell with a nice offshore breeze and a long 15-second period (1142 energy). Afternoon is even cleaner with a light offshore wind and a 5ft SW swell (1045 energy). That's a top-tier session on the cards. Thursday the 17th is smaller but glassy in the afternoon with a 3ft SSW swell – a fun end to the first week.
We get a flat, windy gap from Friday the 18th through Saturday the 19th – poor conditions, don't bother.
Sunday the 20th starts to build again. Morning has a 5ft SW swell but cross-shore wind. The afternoon is the real reward: clean with a 5ft SW swell, light cross-offshore breeze, and strong energy (1246). That afternoon is a must.
Looking into the second week, Tuesday the 22nd is the big one. Morning shows a 7ft SW swell with cross-offshore wind and massive energy at 4278. Afternoon gets even better with a 7ft SSW swell and light offshore winds (2126 energy). This is expert territory – too big for beginners. Keep an eye on this forecast.
Wednesday the 23rd still has a 6ft SSW swell in the morning but cross-shore wind makes it so-so. The rest of the week is onshore and lumpy until Saturday the 26th when we get clean conditions returning with a 4ft to 5ft SSW swell and gentle offshore winds. A solid way to close out.
Best bets: Friday the 11th and Wednesday the 16th are absolute standouts this week. Second week, Tuesday the 22nd is the one to watch, but it's a week out so don't hold me to it yet.
- Rusty
Short Range ForecastLight rain (total 8mm), mostly falling on Sat night. Warm (max 21°C on Sat night, min 13°C on Fri morning). Winds increasing (light winds from the ENE on Fri afternoon, fresh winds from the NW by Sun morning). | Days 4-6 Weather SummaryMostly dry. Very mild (max 16°C on Mon afternoon, min 9°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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) | SSW 15 | SSW 16 | SSW 16 | SSW 16 | SW 15 | SSW 15 | SSW 16 | WSW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SSW 14 | SW 15 | SSW 14 | SW 15 | SSW 16 | SW 14 | SSW 14 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 674 | 859 | 926 | 832 | 693 | 377 | 458 | 1348 | 322 | 565 | 478 | 834 | 1568 | 1604 | 1237 | 1142 | 1045 | 909 | 469 | 347 | 183 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | on | on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | off | off | off | cross-off | glassy | cross-off |
High Tide | 3:06PM0.02m | 4:03AM0.01m | 3:15PM0.02m | 4:29AM0.02m | 3:21PM0.02m | 5:01AM0.02m | 3:19PM0.02m | 5:27AM0.02m | 3:22PM0.01m | 6:03AM0.02m | 3:14PM0.01m | 6:41AM0.02m | 2:57PM0.01m | ||||||||
Low Tide | 9:57PM0.00m | 9:18AM0.01m | 9:54PM0.00m | 9:56AM0.01m | 10:01PM-0.00m | 10:30AM0.01m | 10:15PM-0.00m | 10:59AM0.01m | 10:29PM-0.00m | 11:23AM0.01m | 10:45PM-0.00m | 11:38AM0.01m | 11:03PM-0.00m | ||||||||
 | |  | |  |  |  | | | |  |  | | | | | | | | | | |
 | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:20 | — | — | 6:20 | — | — |
 | — | 6:08 | — | — | 6:09 | — | — | 6:10 | — | — | 6:12 | — | — | 6:12 | — | — | 6:13 | — | — | 6:14 | — |
mm | — | — | — | — | — | 6 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 16 | 17 | 19 | 20 | 21 | 16 | 14 | 14 | 14 | 16 | 14 | 13 | 13 | 11 | 11 | 11 | 10 | 13 | 15 | 16 |
Feels °C | 11 | 13 | 13 | 14 | 15 | 16 | 10 | 8 | 10 | 10 | 12 | 10 | 7 | 6 | 6 | 7 | 7 | 5 | 10 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | SSW 16 | SSW 16 | SSW 16 | SW 15 | SSW 15 | SSW 16 | NE 4 | SW 15 | SSW 19 | SW 18 | SW 13 | SW 15 | SSW 14 | SW 15 | SSW 14 | SW 15 | SSW 16 | SW 14 | SSW 14 | SW 13 |
| kJ | 674 | 859 | 926 | 832 | 693 | 377 | 458 | 1 | 322 | 37 | 80 | 84 | 1568 | 1604 | 1237 | 1142 | 1045 | 909 | 469 | 347 | 183 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | SW 19 | — | NE 4 | — | SSW 19 | SSW 18 | SW 16 | — | — | — | — | — | — | — | E 3 | SSW 16 |
| kJ | — | — | — | — | — | 171 | — | 5 | — | 36 | 31 | 68 | — | — | — | — | — | — | — | 1 | 151 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SW 13 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 27 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ESE 4 | E 3 | E 2 | NE 3 | NE 3 | NE 3 | NNE 3 | WSW 16 | WSW 6 | SW 14 | SW 14 | SW 16 | SSW 15 | SSE 4 | SE 4 | ESE 4 | ESE 4 | ESE 4 | E 4 | ENE 3 | E 3 |
| kJ | 2 | 1 | 1 | 2 | 2 | 2 | 9 | 1348 | 72 | 565 | 478 | 834 | 1550 | 11 | 18 | 9 | 5 | 8 | 4 | 1 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 2 | 79 | 0 | 100 | 161 | 480 | 435 | 499 | 595 | 499 | 13 | 13 | 14 | 0 | 0 | 0 | 18 | 0 | 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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