
Surf Forecasts:
Trespassers surf forecast from 10 Sep 2026:
- Best quality surf: Tuesday 15 Sep, 12PM (local time) - 6ft (1.8m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 6AM (local time) - 6ft (1.8m), 16s period, SW swell with 1,531 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 12AM (local time) - 4.5ft (1.3m), 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 Friday (Sep 11) at 12AM. The primary swell is predicted to be 1.3m and 15s period with a secondary swell of 0.1m and 25s. 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 16s and forecast to arrive on Wednesday (Sep 16) at 6AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Friday (Sep 11) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 11th Sep) | 4.5ft (1.3m) 15s |
| Best Surf | 12PM (Tue 15th Sep) | 6ft (1.8m) 15s |
| Most Powerful | 6AM (Wed 16th Sep) | 6ft (1.8m) 16s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Right, g’day, Rusty here. Let’s have a look at what’s cookin’ over the next couple of weeks. We’ve got one break to focus on, Trespassers, a reef set-up that’s for the advanced crew, and it’s fairly consistent, which is good news. The water’s sittin’ at 59°, right around normal for this time of year, so nothin’ freaky there.
The first real action kicks off on Thursday the 10th of September, and it’s a ripper start. We’ve got a solid SSW groundswell, about 5ft with a long 16-second period, and light offshore E winds. This is proper, clean stuff – the wave energy is strong, comin’ in at 1286, and it’s gonna give you some grunty, lined-up waves. This is the standout of the whole outlook for me, the conditions are just mint.
Friday the 11th keeps it goin’, with the swell droppin’ a touch to about 4ft but still holdin’ that long period, and the wind stays offshore, light on the Friday arvo with a gorgeous glassy feel. Saturday the 12th is still surfable, but the wind swings cross-offshore, which is still clean but not quite as perfect. Sunday the 13th through Monday the 14th, those W and WSW winds switch onshore and it turns messy – a write-off, honestly. The wave energy drops off into the moderate range.
We get back into it proper on Tuesday the 15th with a jump in swell – about 6ft from the SW – but the wind is cross-offshore, and the readings say it’s a bit marginal. Still, there’s plenty of grunt there (1377). Then, Wednesday the 16th is another absolute beauty, with about 6ft of swell, long 16-second period, light offshore breezes, and a glassy afternoon with barely a breath of wind. The wave energy is pumpin’ at 1460, and it’s flagged as excellent for experienced surfers, so get on it.
After that, it gets a bit scruffy. Thursday the 17th is okay, but from Friday the 18th through to Monday the 21st, we’re mostly in the doldrums with small leftover swell and poor, cross or onshore winds. Monday the 21st shows a glimmer with about 4ft from the SW and light offshore wind, but it’s modest. Tuesday the 22nd gets messy with lumpy cross-shore winds, even though there’s a spike of about 4ft swell, it’s not clean.
Now, the long range – Thursday the 24th and Friday the 25th of September – we see a big jump in swell height, hittin’ about 8ft and 7ft, and the wave energy goes through the roof, over 3000. But here’s the kicker: the wind is fresh cross-onshore or lumpy from the SSW, and it’s listed as poor surf conditions. For the advanced crew at a reef, that kind of size with bad wind is gonna be a battle. It’s tempting to think about, but with that onshore chop, it’s more likely a kite-surfing show than a paddler’s dream. Keep an eye on it, but don’t hold your breath.
So, bottom line: get out there Thursday the 10th to Saturday the 12th, and especially Wednesday the 16th – those are your gold days. The rest is either flat, messy, or too gnarly with bad wind.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Sat night, min 12°C on Thu afternoon). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 16°C on Mon afternoon, min 10°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Thu 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SSW 16 | SW 15 | SSW 15 | SSW 16 | SW 16 | SW 15 | SW 14 | SW 12 | SW 13 | SW 15 | SW 14 | SW 14 | SSW 16 | SSW 15 | SSW 15 |
Wave Graph | ||||||||||||||||||||
1273 | 740 | 674 | 859 | 926 | 832 | 693 | 377 | 458 | 362 | 226 | 440 | 272 | 282 | 1377 | 1220 | 1220 | 1460 | 1222 | 863 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | cross-off | cross-off | cross-off | on | on | on | on | on | cross | cross-off | cross-off | cross-off | off | glassy | off |
High Tide | 3:44AM0.01m | 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 | ||||||||
Low Tide | 10:01PM0.00m | 8:36AM0.01m | 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 | |||||||
— | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:20 | — | — | |
6:08 | — | — | 6:08 | — | — | 6:09 | — | — | 6:10 | — | — | 6:12 | — | — | 6:12 | — | — | 6:13 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 13 | 15 | 16 | 16 | 18 | 20 | 21 | 17 | 14 | 13 | 15 | 16 | 13 | 13 | 13 | 11 | 12 | 14 | 11 |
Feels °C | 8 | 10 | 12 | 14 | 13 | 13 | 15 | 16 | 14 | 10 | 11 | 12 | 12 | 10 | 10 | 9 | 7 | 10 | 12 | 7 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SSW 16 | SW 15 | SSW 15 | SSW 16 | SW 16 | SW 15 | SW 14 | SW 12 | SW 13 | SW 15 | SW 14 | SW 14 | SSW 16 | SSW 15 | SSW 15 |
1273 | 740 | 674 | 859 | 926 | 832 | 693 | 377 | 458 | 362 | 226 | 440 | 272 | 282 | 1377 | 1220 | 1220 | 1460 | 1222 | 863 | |
Swell 2 Height (m) Direction Period (s) | S 26 | S 25 | — | — | — | — | — | SW 19 | NE 4 | W 8 | WSW 4 | SSW 19 | SW 18 | SSW 16 | — | — | — | — | — | — |
13 | 13 | — | — | — | — | — | 170 | 3 | 1 | 5 | 37 | 80 | 173 | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | W 8 | — | — | SSW 18 | SW 13 | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | 1 | — | — | 31 | 28 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | ESE 4 | ESE 4 | ESE 4 | ESE 3 | ESE 3 | NE 3 | NE 3 | NNE 3 | NW 4 | W 4 | — | WSW 6 | WSW 4 | — | SE 3 | SE 4 | ESE 4 | ESE 4 | ESE 4 | SE 3 |
10 | 14 | 4 | 2 | 1 | 1 | 2 | 2 | 7 | 6 | — | 10 | 7 | — | 4 | 6 | 10 | 8 | 5 | 3 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 14 | 0 | 79 | 17 | 138 | 13 | 17 | 138 | 13 | 11 | 7 | 11 | 0 | 0 | 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.










