Surf Forecasts:
Trespassers surf forecast from 18 Aug 2026:
- Best quality surf: Sunday 23 Aug, 9AM (local time) - 4.5ft (1.4m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 22 Aug, 3AM (local time) - 6ft (1.8m), 16s period, SW swell with 1,571 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 9PM (local time) - 5ft (1.5m), 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 Saturday (Aug 22) at 9PM. The primary swell is predicted to be 1.5m 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 16s and forecast to arrive on Saturday (Aug 22) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Wednesday (Aug 19) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 22nd Aug) | 5ft (1.5m) 14s |
| Best Surf | 9AM (Sun 23rd Aug) | 4.5ft (1.4m) 17s |
| Most Powerful | 3AM (Sat 22nd Aug) | 6ft (1.8m) 16s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s comin’ down the line for Trespassers. This reef slab is the only game in town for the next 16 days, so we’re gonna focus right here. It’s a fairly consistent spot, takes a fair bit of swell, and likes it from the SSW—that’s its sweet spot. Water temp is sittin’ right around 59°F, which is pretty much bang on average for this time of year, so nothin’ weird there.
The start of this outlook is a bit of a bumma, to be honest. From Tuesday the 18th all the way through to Saturday the 22nd, it’s a real mixed bag of cross-on and onshore winds muckin’ up the waves. We’ve got some solid energy in the water—moderate to strong stuff (563 to 1318)—but the wind just won’t play nice. The swell is there, but the surface is chopped and lumpy. It’s not really worth paddlin’ out for.
Now, Sunday the 23rd morning is where things start to get interesting. The wind swings around to a light cross-off from the N, and the swell is a clean 5ft from the SW with a long 17-second period. That’s a proper groundswell. The combined energy is strong (1363). This is a standout for the whole run. It’s clean, it’s got push, and it’s a reef break, so that long period is gonna wrap in nicely. For experienced surfers, this is the one. The morning is the pick, no question.
After that, we hit a bit of a lull. Monday the 24th drops off to 3ft, and the energy fades. The wind is messy again. There’s a small window on Tuesday the 25th afternoon when the wind goes glassy and the swell is 3ft from the SW with a 12-second period—that’s clean but small. It’s a good session for a longboard or a fun shape, but nothin’ to get too excited about.
Hold on, because Thursday the 27th gets big. We’re talkin’ 10ft from the SW with a 17-second period and a massive 5274 combined energy. That’s powerful. But—and it’s a big but—the wind is crankin’ from the SW at 22 mph in the morning, fresh and lumpy. This is for experts only. The afternoon settles a bit to a cross-shore, but it’s still rugged. If you’re a seasoned charger, you might find a way, but it’s not what I’d call a casual day out.
The real beauty looks like it’ll be Friday the 28th. Morning and afternoon both have clean conditions with a light cross-off from the SSE. The swell is 7ft in the morning, dropping to 6ft in the afternoon, both from the SW with 14-15 second periods. The energy is strong (1994 to 2217). This is another standout. It’s big enough to get your heart pumpin’ but the wind is off, so it’ll be clean. For experienced surfers, this is the best bet of the second week.
The last few days of August and into the start of September offer some smaller, cleaner windows. Glassy mornings and gentle offshore winds with swell around 3ft to 4ft. The 18-second period swell on Wednesday the 2nd of September is a nice long groundswell, but it’s only 4ft to 4ft, so it’s more of a quality session for a reef that loves that long period. It’s not a massive day, but it’ll be fun and clean.
To wrap it up: the two true standouts here are Sunday the 23rd of August morning for the first big clean swell, and Friday the 28th of August for the second big, clean swell. The rest is a mix of small clean days or big, windy slop. If you’re a beginner, keep an eye on the days with swell under 5ft and clean conditions, like the 25th or the 1st of September. For the big stuff over 8ft, that’s only for the experts.
Keep your eyes on the horizon, and your board waxed. Rusty out.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue night. Very mild (max 16°C on Tue afternoon, min 13°C on Tue night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Very mild (max 15°C on Mon morning, min 12°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 | SW 16 | SW 15 | SW 15 | SW 13 | SW 16 | SW 16 | SW 16 | SW 14 | SW 17 | SW 16 | SW 15 | SW 15 | SW 14 | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 |
Wave Graph | ||||||||||||||||||||
458 | 255 | 236 | 291 | 711 | 964 | 886 | 1055 | 821 | 1560 | 1449 | 1359 | 1140 | 763 | 1193 | 906 | 489 | 297 | 284 | 249 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | glassy | cross-off | cross | cross | on | cross-on | cross-off |
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 | 11:29PM-0.00m | 11:06AM0.01m | 11:48PM-0.00m | 00:04AM0.00m | 00:16AM0.00m | 00:18AM0.00m | 11:45PM0.00m | 11:01PM0.00m | ||||||||||||
— | — | 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 | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 15 | 14 | 14 | 14 | 14 | 15 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 14 | 14 | 14 | 15 | 15 | 13 |
Feels °C | 11 | 9 | 8 | 8 | 10 | 10 | 11 | 12 | 10 | 10 | 11 | 12 | 10 | 13 | 11 | 11 | 12 | 13 | 12 | 11 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SW 16 | SW 15 | SW 15 | SW 13 | SW 16 | SW 16 | SW 16 | SW 14 | SW 17 | SW 16 | SW 15 | SW 15 | SW 14 | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 |
458 | 255 | 236 | 255 | 711 | 964 | 886 | 1055 | 821 | 1560 | 1449 | 1359 | 1140 | 763 | 1193 | 906 | 489 | 297 | 284 | 249 | |
Swell 2 Height (m) Direction Period (s) | SSW 16 | NE 4 | — | SW 20 | SW 18 | SSW 16 | — | SW 20 | SW 18 | SW 17 | — | SW 24 | SSW 21 | SW 19 | SSW 17 | — | — | SSW 21 | SW 19 | SW 18 |
105 | 4 | — | 64 | 263 | 162 | — | 136 | 455 | 145 | — | 22 | 178 | 372 | 170 | — | — | 43 | 96 | 154 | |
Swell 3 Height (m) Direction Period (s) | — | NE 4 | — | SSW 20 | SW 18 | — | — | SW 19 | — | — | — | — | — | — | — | — | — | — | — | — |
— | 2 | — | 41 | 54 | — | — | 96 | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | N 4 | NW 4 | W 7 | WSW 8 | — | — | NW 4 | — | — | — | — | — | — | — | — | — | — | NW 3 | W 4 | WSW 4 |
9 | 15 | 203 | 291 | — | — | 3 | — | — | — | — | — | — | — | — | — | — | 2 | 10 | 18 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 100 | 162 | 480 | 546 | 17 | 14 | 17 | 13 | 59 | 159 | 13 | 13 | 13 | 0 | 0 | 14 | 14 | 14 | 138 | 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.











