Surf Forecasts:
Trespassers surf forecast from 17 Aug 2026:
- Best quality surf: Sunday 23 Aug, 12AM (local time) - 4.5ft (1.4m), 14s period, SW swell with glassy winds.
- Most powerful swell: Friday 21 Aug, 3PM (local time) - 6ft (1.8m), 17s period, SW swell with 1,818 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 12AM (local time) - 4.5ft (1.4m), 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 Sunday (Aug 23) at 12AM. The primary swell is predicted to be 1.4m and 14s period with a secondary swell of 0.7m and 19s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Trespassers in the next 16 days are 1.8m 17s and forecast to arrive on Friday (Aug 21) at 3PM. Winds are predicted to be onshore 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 (Aug 18) at 9PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 23rd Aug) | 4.5ft (1.4m) 14s |
| Best Surf | 12AM (Sun 23rd Aug) | 4.5ft (1.4m) 14s |
| Most Powerful | 3PM (Fri 21st Aug) | 6ft (1.8m) 17s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s coming up. We’ve only got one spot on the radar this time around, and it’s a proper reef setup for the advanced crew.
The first proper surf window is a bit of a wait, but the opening days of the forecast are a write-off with messy, onshore winds and poor quality. The real action starts to build from the 23rd of August onwards. The water temp is sitting around 59°F, which is about average for this time of year, so nothing freaky there.
The standout window is hands down the Sunday the 23rd of August. We’ve got a solid SW groundswell rolling in, with a very long period of 16 seconds, pushing 4ft to 5ft. The energy is moderate (1056-957). But the real magic is the wind. Sunday morning we’ve got a light cross-offshore breeze, and by afternoon it goes glassy – dead calm. That’s going to slick up the faces at Trespassers perfectly. For a reef break, that long-period groundswell and glassy conditions are a dream for the experienced surfer. Crowds are possible here, so don’t expect to have it to yourself.
After that, the quality drops off again through the next week with onshore winds and choppy conditions. But hold onto your board, because the end of the forecast is looking very promising. The 31st of August into the 1st and 2nd of September is the real sleeper hit. The 2nd of September in particular is a standout call: clean, offshore winds, and a solid 6ft SW swell (energy 1571) with a period of 16 seconds. That’s excellent, powerful surf for experienced surfers only – over 5ft, so it’s a bit much for the beginners. The 1st of September afternoon also delivers a glassy, clean 5ft SW swell. This whole run from the 31st to the 2nd is the best on offer, but it’s over a week away, so keep an eye on the forecasts.
For the rest of the first week of September, the wind stays clean, but the swell drops back. Still, a 4ft to 6ft SW swell with cross-offshore or glassy wind is a solid bet for the advanced crew.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue night. Very mild (max 16°C on Tue afternoon, min 12°C on Thu night). Winds decreasing (fresh winds from the NNE on Tue night, light winds from the W by Thu night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 15°C on Fri night, min 12°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 17 | SSW 16 | SW 16 | SW 15 | SW 15 | SW 13 | SW 16 | SW 16 | SW 16 | SW 14 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 687 | 458 | 255 | 236 | 270 | 892 | 954 | 489 | 1149 | 899 | 1818 | 1551 | 1591 | 1088 | 857 | 581 | 957 | 576 | 357 | 246 | 208 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | on | on | cross-on | cross-on | glassy | cross-off | glassy | off | cross | cross-on | cross |
High Tide | 3:55PM0.02m | 7:35AM0.01m | 3:32PM0.02m | 2:53PM0.02m | 2:19PM0.02m | 2:13PM0.02m | 2:21PM0.02m | 2:29PM0.02m | 2:56AM0.01m | ||||||||||||
Low Tide | 11:01AM0.01m | 11:29PM-0.00m | 11:06AM0.01m | 11:48PM-0.00m | 00:04AM0.00m | 00:16AM0.00m | 00:18AM0.00m | 11:45PM0.00m | 11:01PM0.00m | ||||||||||||
 |  |  | |  |  | | | | | | | | |  | | | | | | | |
 | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — |
 | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — |
mm | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 16 | 14 | 14 | 14 | 14 | 14 | 15 | 14 | 14 | 14 | 15 | 14 | 14 | 13 | 14 | 14 | 14 | 14 | 14 | 13 |
Feels °C | 10 | 11 | 8 | 8 | 9 | 10 | 11 | 12 | 12 | 10 | 10 | 12 | 11 | 11 | 11 | 12 | 13 | 12 | 12 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SSW 16 | SW 16 | SW 15 | SW 15 | SW 13 | SW 16 | SW 16 | SW 16 | SW 14 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SW 13 |
| kJ | 687 | 458 | 255 | 236 | 255 | 892 | 954 | 489 | 1149 | 899 | 1818 | 1551 | 1591 | 1088 | 857 | 581 | 957 | 576 | 357 | 246 | 208 |
Swell 2 Height (m) Direction Period (s) | SSW 18 | SSW 16 | E 4 | SW 8 | SW 20 | SW 19 | SSW 16 | WSW 10 | SW 20 | SW 18 | — | — | SSW 24 | SSW 21 | SW 19 | SSW 17 | ENE 3 | S 22 | SSW 20 | SW 18 | SW 18 |
| kJ | 106 | 105 | 1 | 35 | 64 | 177 | 175 | 164 | 134 | 455 | — | — | 54 | 178 | 376 | 475 | 1 | 9 | 37 | 85 | 79 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SSW 21 | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 20 | — | — |
| kJ | — | — | — | — | 42 | — | — | — | — | — | — | — | — | — | — | — | — | — | 15 | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | N 4 | NNW 4 | W 6 | WSW 8 | WSW 6 | — | WNW 4 | — | — | — | — | — | — | — | — | — | — | N 2 | NNW 3 | NNW 2 |
| kJ | 7 | 12 | 38 | 116 | 270 | 43 | — | 18 | — | — | — | — | — | — | — | — | — | — | 1 | 4 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 112 | 100 | 162 | 161 | 165 | 14 | 14 | 17 | 13 | 13 | 138 | 13 | 13 | 13 | 0 | 0 | 0 | 0 | 14 | 14 | 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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