
Surf Forecasts:
Trespassers surf forecast from 13 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 3PM (local time) - 5.5ft (1.7m), 15s period, SSW swell with offshore winds.
- Most powerful swell: Tuesday 15 Sep, 6PM (local time) - 6ft (1.8m), 14s period, SSW swell with 1,370 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 3PM (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 3PM. 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 1.8m 14s and forecast to arrive on Tuesday (Sep 15) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Tuesday (Sep 15) at 6PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Wed 16th Sep) | 5.5ft (1.7m) 15s |
| Best Surf | 3PM (Wed 16th Sep) | 5.5ft (1.7m) 15s |
| Most Powerful | 6PM (Tue 15th Sep) | 6ft (1.8m) 14s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's get into it. We've got a bit of a wait on our hands, so don't go paddling out just yet.
The opening days are a write-off. Sunday the 13th through Monday the 14th are a no-go with poor surf and onshore winds. The real wait stretches from now all the way through the 15th and 16th. We see some size coming in, but the wind and tide are just not playing ball. It's not until Wednesday the 16th afternoon that things start to look interesting.
Now, here’s the standout run. The pick of the whole period is shaping up to be Wednesday, September 16th afternoon over at Trespassers. We've got a clean 6ft swell rolling in from the SSW, and the wind is swinging offshore. That's a game changer. The wave energy is strong (1238), and with that long 15-second period, you're looking at proper groundswell lines. It's a reef break for the advanced crew, so leave the foamies at home. The water temp is sitting at 59°, which is pretty average for this time of year, so a good wetsuit is all you need.
Thursday the 17th keeps the good vibes rolling. The morning sees a lighter cross-off breeze with a 4ft SSW swell, but the real magic is Thursday afternoon. The wind goes glassy – flat calm – with a clean 3ft swell. It'll be smaller, but for a log or a fish, that's going to be silky smooth and a joy. The water temp anomaly is normal, so no surprises there.
Friday the 18th sees the wind pick up and the quality drops. We then go through a pretty bleak stretch from the 19th to the 20th. On the 20th, the swell jumps to 7ft but it's a messy cross-onshore wind, making it a write-off. The 21st and 22nd have some decent size and potential, but the winds aren't as clean.
Then we get a second, more serious window. Sunday, September 27th is the big one. That morning, Trespassers is looking at a massive 10ft SSW swell with an incredibly long 18-second period. The combined energy is off the charts at 7428, and you've got light offshore winds. This is expert territory, and it's going to be a serious, heavy reef. This is not for the faint of heart. The following Monday the 28th is also excellent, with a 10ft S swell and glassy conditions – just incredible.
Crowds can pop up at Trespassers sometimes, but on those big days, the crowd will sort itself out quick. The first week’s best is Wednesday afternoon and Thursday. The second week’s standout is the 27th and 28th, but remember, that’s far out and forecasts can shift.
Keep your eyes on the charts.
Rusty.
Short Range ForecastMostly dry. Very mild (max 16°C on Mon afternoon, min 9°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 21°C on Sat morning, min 9°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 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 16 | SW 15 | SW 14 | SW 12 | SW 13 | SW 15 | SW 14 | SW 14 | SSW 15 | SSW 15 | SW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 18 | SSW 16 | SSW 14 | SSW 13 | W 8 | WSW 7 |
Wave Graph | ||||||||||||||||||||
362 | 226 | 231 | 335 | 363 | 1358 | 1203 | 1220 | 1206 | 1238 | 918 | 538 | 332 | 229 | 534 | 322 | 186 | 120 | 272 | 227 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | cross | cross | cross-off | cross-off | cross-off | off | off | cross-off | glassy | cross-off | cross | cross | cross-off | cross | cross | on |
High Tide | 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 | 1:34PM0.02m | |||||||||
Low Tide | 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 | 11:27PM0.00m | ||||||||
— | — | 6:24 | — | — | 6:22 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:16 | — | — | |
6:10 | — | — | 6:12 | — | — | 6:12 | — | — | 6:13 | — | — | 6:14 | — | — | 6:14 | — | — | 6:15 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 14 | 13 | 16 | 15 | 13 | 13 | 10 | 12 | 12 | 9 | 11 | 12 | 14 | 16 | 19 | 20 | 21 | 23 | 23 |
Feels °C | 10 | 10 | 10 | 12 | 11 | 7 | 6 | 5 | 7 | 7 | 4 | 9 | 10 | 10 | 11 | 16 | 17 | 14 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 14 | SW 18 | SW 16 | SW 15 | SW 14 | SW 14 | SSW 15 | SSW 15 | SW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 18 | SSW 16 | SSW 14 | SSW 13 | SSW 13 | SW 12 |
362 | 226 | 231 | 80 | 208 | 1358 | 1203 | 1220 | 1206 | 1238 | 918 | 538 | 332 | 229 | 534 | 322 | 186 | 120 | 116 | 73 | |
Swell 2 Height (m) Direction Period (s) | NE 4 | — | SSW 19 | SSW 18 | SW 16 | — | — | — | — | — | — | — | E 3 | SW 20 | — | — | W 6 | SSW 20 | SSW 19 | SW 18 |
1 | — | 37 | 31 | 67 | — | — | — | — | — | — | — | 1 | 102 | — | — | 7 | 38 | 35 | 81 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SSW 13 | — | — | — | — | — | — | — | — | — | — | — | — | NE 5 | SW 16 | SW 15 |
— | — | — | — | 17 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 10 | 54 | |
Wind waves Height (m) Direction Period (s) | W 4 | WSW 5 | WSW 5 | SW 12 | SW 13 | S 4 | SSE 4 | SE 4 | SE 4 | ESE 4 | SE 4 | ESE 4 | — | — | NNW 4 | NNW 4 | N 3 | NNW 5 | W 8 | WSW 7 |
26 | 27 | 33 | 335 | 363 | 11 | 5 | 14 | 7 | 10 | 7 | 2 | — | — | 6 | 8 | 4 | 81 | 272 | 227 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 381 | 101 | 353 | 160 | 13 | 59 | 13 | 13 | 11 | 0 | 0 | 0 | 0 | 0 | 138 | 14 | 0 | 159 | 161 | 730 |
Best forecast wave conditions in Yorke Peninsula | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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.










