
Surf Forecasts:
Trespassers surf forecast from 15 Sep 2026:
- Best quality surf: Thursday 17 Sep, 3AM (local time) - 4.5ft (1.4m), 15s period, SSW swell with offshore winds.
- Most powerful swell: Wednesday 16 Sep, 3PM (local time) - 5.5ft (1.7m), 15s period, SSW swell with 1,238 kJ wave energy.
- Next surfable swell (1★+): Thursday 17 Sep, 3AM (local time) - 4.5ft (1.4m), 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 Thursday (Sep 17) at 3AM. The primary swell is predicted to be 1.4m 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 Wednesday (Sep 16) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Wednesday (Sep 16) at 6AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 17th Sep) | 4.5ft (1.4m) 15s |
| Best Surf | 3AM (Thu 17th Sep) | 4.5ft (1.4m) 15s |
| Most Powerful | 3PM (Wed 16th Sep) | 5.5ft (1.7m) 15s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright, this is Rusty comin' at you from the beach.
First up, the vibes for Trespassers. This is an advanced reef set-up that needs a solid SSW groundswell to light up. We've got a bit of a slow start, with the first few days offering mostly small, clean conditions but nothing to get too excited about. The water temp is sitting about average for this time of year, so no surprise when you jump in.
Through the middle of the week starting September 16th, it's honestly a bit flat and a letdown. Wednesday the 16th has some chest-high swell from the SSW (6 ft) with a nice 15-second period, but the wind is a cross-offshore zephyr (12 mph) that's just messing up the lineup; the energy is strong (1190) but the scores say it's a no-go. Thursday the 17th is a tease. The morning is knee-to-waist high (4 ft) and clean, but the real gem is Thursday afternoon. The wind goes totally glassy (0 mph) on a 3 ft SSW swell with a 14-second period. The energy is moderate (402) but the conditions are perfect. That afternoon window is the absolute best on offer in this first week—a clean, glassy reef wave no one is on. It's small, but for a few hours, it'll be magic.
Friday the 18th through the weekend (19th and 20th) is a write-off. Cross-shore winds and onshore slop kill any chance of a decent wave. We've got a gap of poor conditions right through Sunday.
Things start to look up again on Monday the 21st with a cleaner cross-off breeze and a 4 ft SW swell (537), but the real highlight is shaping up for September 22nd. Tuesday the 22nd is a standout. Morning has a solid 5 ft SSW swell (842) with 15-second energy and a clean offshore wind from the east (12 mph). Afternoon is even better—5 ft (962), same direction and period, with a light offshore breeze (6 mph). This is the pick of the first ten days: solid, clean, and good energy.
The next few days drop off again into messy, onshore winds and smaller swell through the 23rd to the 25th. Then, on September 26th there’s a massive spike in swell from a very long period (21 seconds) SSW pulse, but the wind is a strong cross-offshore (19 mph) and it's just too wild. The energy is huge (1311) but the conditions are poor.
The very end of the window, however, has a banger. September 30th (Wednesday morning) is the standout of the entire forecast. We’re looking at a 5 ft SSW groundswell with a long 18-second period and a massive energy reading of 1633. The wind is a gentle cross-offshore breeze (9 mph) and the conditions are clean. This is an excellent, powerful wave for experienced surfers only. That morning session is the one to circle on the calendar.
The first week of October (October 1st) brings another clean, cross-off day with a 4 ft SSW swell and 17-second period, but the wind is a bit stronger (16 mph). It's worth a look, but not the same magic as the 30th.
Overall, if you’re an advanced surfer, the clear standout is the morning of September 30th. For a more manageable, glassy session, grab Thursday the 17th afternoon.
Rusty
Short Range ForecastMostly dry. Very mild (max 19°C on Fri afternoon, min 9°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Sat afternoon, min 12°C on Mon afternoon). Mainly fresh winds. | ||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | ||||||||||||||
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 14 | SSW 15 | SSW 15 | SW 15 | SSW 14 | SSW 14 | SSW 17 | SSW 16 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | SW 18 | WSW 12 | SW 16 | SW 14 | SW 12 | SW 13 | SSW 14 |
Wave Graph | |||||||||||||||||||
1220 | 1190 | 1238 | 930 | 545 | 402 | 261 | 417 | 291 | 134 | 118 | 114 | 82 | 283 | 245 | 686 | 537 | 473 | 785 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | cross-off | cross | cross | cross | cross | cross-off | cross-off | on | on | cross-on | cross-off | cross-off | off |
High Tide | 6:03AM0.02m | 3:14PM0.01m | 6:41AM0.02m | 2:57PM0.01m | 7:39AM0.02m | 2:18PM0.02m | 1:34PM0.02m | 1:25PM0.02m | 1:32PM0.02m | ||||||||||
Low Tide | 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 | 11:15PM0.00m | 10:31PM0.00m | |||||||||
— | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:16 | — | — | 6:15 | — | — | 6:13 | — | — | |
6:12 | — | 6:13 | — | — | 6:14 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 10 | 12 | 12 | 10 | 11 | 12 | 14 | 16 | 19 | 20 | 20 | 24 | 24 | 15 | 15 | 15 | 14 | 14 | 12 |
Feels °C | 5 | 8 | 7 | 6 | 8 | 11 | 10 | 11 | 16 | 16 | 15 | 19 | 19 | 11 | 11 | 13 | 11 | 9 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SSW 15 | SSW 15 | SW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 16 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | SW 12 | SW 16 | SW 16 | SW 14 | SW 12 | SW 13 | SSW 14 |
1220 | 1190 | 1238 | 930 | 545 | 402 | 149 | 417 | 291 | 134 | 118 | 114 | 73 | 129 | 245 | 686 | 537 | 473 | 785 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | SSW 17 | — | — | W 6 | WSW 6 | SSW 19 | SW 18 | SW 12 | — | SW 14 | — | SSW 16 | — |
— | — | — | — | — | — | 261 | — | — | 6 | 4 | 37 | 82 | 37 | — | 179 | — | 52 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | SW 20 | W 6 | WSW 7 | — | — | — | — | SW 16 | — |
— | — | — | — | — | — | — | — | — | — | 15 | 1 | 4 | — | — | — | — | 67 | — | |
Wind waves Height (m) Direction Period (s) | SE 4 | SE 4 | ESE 4 | SE 4 | ESE 4 | E 3 | — | NNW 4 | NW 4 | — | NNW 3 | N 3 | N 3 | WSW 12 | WSW 7 | — | — | W 4 | SE 2 |
15 | 8 | 5 | 7 | 2 | 1 | — | 5 | 5 | — | 5 | 6 | 5 | 283 | 70 | — | — | 6 | 1 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 13 | 11 | 7 | 11 | 0 | 0 | 0 | 14 | 14 | 17 | 17 | 0 | 100 | 739 | 742 | 59 | 0 | 13 | 0 |
Best forecast wave conditions in Yorke Peninsula | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










