
Surf Forecasts:
Trespassers surf forecast from 12 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 12PM (local time) - 5.5ft (1.7m), 15s period, SSW swell with offshore winds.
- Most powerful swell: Tuesday 15 Sep, 9AM (local time) - 5.5ft (1.7m), 15s period, SSW swell with 1,279 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 12PM (local time) - 5.5ft (1.7m), 15s 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 Wednesday (Sep 16) at 12PM. The primary swell is predicted to be 1.7m and 15s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Trespassers in the next 16 days are 1.7m 15s and forecast to arrive on Tuesday (Sep 15) at 9AM. Winds are predicted to be cross-shore 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+) | 12PM (Wed 16th Sep) | 5.5ft (1.7m) 15s |
| Best Surf | 12PM (Wed 16th Sep) | 5.5ft (1.7m) 15s |
| Most Powerful | 9AM (Tue 15th Sep) | 5.5ft (1.7m) 15s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into what’s coming down the pipe at Trespassers.
We’re kicking off a slow start. Nothing rideable on the first day or two. The wind is messy and the conditions are junk. Sunday the 13th and Monday the 14th are write-offs. You’re better off waxing your board and waiting.
Tuesday the 15th things start to stir. We’ve got a SSW swell building to 6 ft, with a long 15-second period. That’s proper groundswell energy, but the wind is still cross or side-offshore, keeping things a bit rough in the morning. The afternoon improves, with cleaner lines and moderate energy (1203). Still only marginal, but it’s the first real sign of life.
Wednesday the 16th is where it gets interesting. The swell holds at 6 ft from the SSW, still at 15 seconds, and by the afternoon we get offshore wind from the ESE at 16 mph. The wave energy is pumping (1238), and the conditions are clean. This is the first standout of the period – a solid afternoon session for someone comfortable in head-high-plus waves.
Thursday the 17th is smaller but sweet. The swell drops to 4 ft with a light offshore breeze in the morning, and then by the afternoon it goes glassy – dead calm, no wind. That’s a rare treat. Clean, gentle sets with moderate energy (351). A fantastic window for a longboard or a mid-length.
Now we hit a dry spell. From Friday the 18th through to Sunday the 20th, the wind and swell are all over the place – cross-shores, strong cross-onshore, and messy lumpy conditions. The energy drops right off. You don’t want to be out there. This stretch lasts a few days. Wait it out.
Monday the 21st brings a fresh pulse. The swell bumps up to 5 ft from the SW, 13-second period, with a light offshore from the east in the morning. The wave energy is moderate (834) and the surf is clean. This is a good, solid day with proper shape. The afternoon turns a little cross-shore, but still fun.
Here we go. Tuesday the 22nd and Wednesday the 23rd are the real standouts. Tuesday morning sees 7 ft SSW swell with a 16-second period – that’s serious groundswell energy (2262). Offshore wind from the east at 12 mph keeps it clean. This is excellent, expert-only territory. The afternoon holds at 7 ft with light offshore. Then Wednesday afternoon goes glassy again – dead calm, no wind, and 5 ft SSW swell rolling in with very long period. That’s a classic afternoon session. Best of the whole run right here.
Thursday the 24th is another cracker for the experienced crew. Swell 7 ft from the SSW, 19-second period – that’s a super long groundswell (3195). Clean cross-offshore wind. It’ll be a bit straight at the beach, but at a reef setup like Trespassers, the long period will push in with serious power and shape.
Friday the 25th and Saturday the 26th drop off again. Cross-shores and choppy conditions kill the quality. Not worth suiting up.
Sunday the 27th and Monday the 28th close the window with a solid pulse. The 27th brings 7 ft to 8 ft SSW swell with fresh offshore winds – big, clean, and powerful (3508). Only for the well-experienced. Monday the 28th holds at 7 ft with a clean offshore breeze. A good way to end the run.
Water temp is about average for this time of year – no crazy anomaly to report. Crowds at Trespassers can show up sometimes, so if you’re hitting those standout days, get there early.
Alright, that’s the picture. Stay patient, pick your windows.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Sun morning. Warm (max 21°C on Sat night, min 11°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 20°C on Fri afternoon, min 9°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | ||||||||||||||
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 | WSW 16 | SW 15 | SW 14 | SW 12 | SW 13 | SSW 15 | SW 14 | SSW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 16 | SSW 16 | SW 14 |
Wave Graph | |||||||||||||||||||
377 | 458 | 832 | 322 | 231 | 341 | 273 | 1279 | 1203 | 1142 | 1206 | 1238 | 851 | 538 | 332 | 229 | 427 | 318 | 214 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | on | on | cross-on | on | cross | cross | cross-off | cross-off | cross-off | off | off | off | glassy | cross-off | cross | cross | cross-off |
High Tide | 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 | 7:39AM0.02m | 2:18PM0.02m | |||||||
Low Tide | 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 | 11:26AM0.01m | 11:18PM0.00m | ||||||
— | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | |
6:09 | — | 6:10 | — | — | 6:12 | — | — | 6:12 | — | — | 6:13 | — | — | 6:14 | — | — | 6:14 | — | |
mm | 1 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 15 | 15 | 14 | 14 | 16 | 15 | 14 | 14 | 11 | 11 | 12 | 9 | 11 | 12 | 14 | 16 | 20 | 21 |
Feels °C | 16 | 11 | 11 | 11 | 11 | 12 | 11 | 9 | 8 | 6 | 6 | 6 | 4 | 8 | 11 | 11 | 11 | 16 | 17 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | SSW 16 | SSW 16 | SW 15 | SW 14 | SW 12 | SW 13 | SSW 15 | SW 14 | SSW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 16 | SSW 16 | SW 14 |
377 | 458 | 223 | 322 | 231 | 341 | 273 | 1279 | 1203 | 1142 | 1206 | 1238 | 851 | 538 | 332 | 229 | 427 | 318 | 214 | |
Swell 2 Height (m) Direction Period (s) | SW 19 | ENE 4 | NE 4 | — | SSW 19 | SW 18 | SW 16 | — | — | — | — | — | — | — | ESE 3 | SW 20 | — | — | W 6 |
170 | 1 | 1 | — | 37 | 80 | 208 | — | — | — | — | — | — | — | 1 | 97 | — | — | 2 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 16 | — | — | — | — | — | — | — | SW 21 | — | — | — | — |
— | — | — | — | — | — | 41 | — | — | — | — | — | — | — | 18 | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | NNE 3 | NNW 3 | WSW 16 | WSW 5 | WSW 5 | WSW 6 | SW 10 | SSW 4 | SSE 4 | SE 4 | SE 4 | ESE 4 | SE 4 | ESE 4 | ENE 3 | — | NNW 3 | NNW 3 | N 2 |
3 | 4 | 832 | 31 | 37 | 19 | 100 | 24 | 5 | 15 | 13 | 15 | 18 | 5 | 2 | — | 2 | 4 | 1 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 79 | 149 | 613 | 160 | 498 | 138 | 13 | 13 | 13 | 14 | 11 | 0 | 0 | 0 | 0 | 0 | 17 | 14 | 0 |
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.










