Surf Forecasts:
Knights surf forecast from 16 Aug 2026:
- Best quality surf: Sunday 23 Aug, 9AM (local time) - 8ft (2.5m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Sunday 23 Aug, 12PM (local time) - 8ft (2.5m), 17s period, SSW swell with 3,904 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 12AM (local time) - 5.5ft (1.7m), 14s period with SSW swell.
Best Forecast Surf Conditions for Knights this week:
The surf forecast for Knights over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 12AM. The primary swell is predicted to be 1.7m and 14s period with a secondary swell of 0.1m and 26s. Another secondary swell of 0.4m and 3s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Knights in the next 16 days are 2.5m 17s and forecast to arrive on Sunday (Aug 23) at 12PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Tuesday (Aug 18) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Mon 17th Aug) | 5.5ft (1.7m) 14s |
| Best Surf | 9AM (Sun 23rd Aug) | 8ft (2.5m) 17s |
| Most Powerful | 12PM (Sun 23rd Aug) | 8ft (2.5m) 17s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, this is Rusty. Let’s talk about what’s coming up at Knights. This spot is an advanced, fairly consistent beach and reef set-up, and it’s going to be a bit of a waiting game for the real magic.
The first proper action we can talk about doesn't show up until Monday morning, August 17. Before that, there’s just nothing worth getting excited about.
The overriding theme here is a long, slow build. The early part of the week offers some clean, offshore conditions, but the swell is small. Tuesday morning, August 18, kicks things off with a 4ft SSW groundswell rolling in at a very long 17 seconds, and the wind is offshore from the NE at 12 mph. It’s clean, but it’s small. The combined energy is moderate (995). It’s a good paddle-out session to get the arms moving, but the wave size isn’t going to get your heart racing.
Then comes a dry spell from Wednesday morning, August 19, through to Thursday afternoon. The swell stays small and the wind turns messy and cross-shore. The surf quality drops off a cliff. If you’re not surfing then, you’re not missing anything.
Things get really interesting on Friday, August 21. The morning shows a 6ft SSW swell at 14 seconds, and the combined energy jumps to a strong 2930. But the wind is light and cross-shore, which holds it back from being perfect. By Friday afternoon, it’s firing harder: 7ft SSW swell at a magnificent 17 seconds, the energy surging to a powerful 4614. The wind is still cross-shore though. It’s big, it’s powerful, but it’s not perfect.
The absolute standout window – and I mean, the one to circle on the calendar – is Sunday morning, August 23. We’ve got an 8ft SSW swell with a long 17-second period, the combined energy is a massive 5042, and the wind is a light, cross-offshore breeze from the NW at 6 mph. This is big. At 8ft, this is experts-only territory. The conditions are described as exceptional, and the surf quality score reflects that. This is the call of the entire forecast.
After that burst of size, Sunday afternoon and Monday the 24th see the wind turn onshore and raw, and the surf quality tanks. It gets messy and poor for several days, through until Wednesday the 26th.
We get another pulse of hope starting Thursday morning, August 27. A 4ft SSW groundswell at 16 seconds, with a gentle cross-offshore breeze and clean conditions. Moderate energy (825). A nice, manageable size.
The final standout to mention is Friday, August 28. The morning brings 7ft SW swell at 11 seconds, with a gentle offshore wind from the NE at 9 mph. This is clean, solid, and excellent for experienced surfers. The energy is moderate to strong (1697). The afternoon looks just as good with 8ft swell and near-calm winds.
Saturday the 29th is a write-off for paddle surfing. The swell gets way too big, over 12ft, and the forecasts are calling it out as too big for this break. That kind of energy and size is more for the kite crew.
Sunday the 30th offers a last hurrah of good size in the morning – a clean 8ft SSW swell – before the period drops off and the wind turns onshore to close things out on the 31st.
So, to boil it all down: Tuesday the 18th is a clean, small day to get wet. Sunday the 23rd morning is the big, expert-level prize. And Friday the 28th is your best bet for a solid, clean, experienced session. Get after it.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue afternoon. Very mild (max 17°C on Tue afternoon, min 11°C on Sun afternoon). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 15°C on Wed afternoon, min 11°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | ||||||||||||||
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 14 | SSW 14 | SSW 16 | SSW 16 | SSW 15 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SW 11 | SW 13 | SW 12 | SW 16 | SW 14 | SW 17 | SSW 16 | SSW 15 | SSW 16 | SSW 15 |
Wave Graph | ||||||||||||||||||||
1396 | 994 | 659 | 1531 | 807 | 742 | 573 | 519 | 314 | 279 | 544 | 529 | 379 | 1317 | 1491 | 2512 | 2206 | 2016 | 3074 | 2479 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | cross-off | cross-off | cross-off | off | off | off | cross-off | cross | cross-off | cross-off | cross | cross-on | cross | cross | cross | cross-on | cross-on | cross-off |
High Tide | 2:35AM0.98m | 2:33PM1.01m | 3:07AM1.04m | 2:43PM0.98m | 3:42AM1.07m | 2:47PM0.96m | 4:20AM1.07m | 2:36PM0.94m | 5:04AM1.04m | 6:12AM0.99m | ||||||||||
Low Tide | 8:23PM0.43m | 8:11AM0.47m | 8:30PM0.39m | 8:40AM0.58m | 8:41PM0.37m | 9:04AM0.70m | 8:53PM0.38m | 9:14AM0.83m | 9:03PM0.40m | 8:38AM0.94m | 9:06PM0.42m | 7:35AM0.99m | 9:02PM0.45m | |||||||
— | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | |
5:43 | — | — | 5:44 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | |
mm | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 11 | 12 | 15 | 14 | 13 | 15 | 17 | 15 | 15 | 15 | 12 | 15 | 15 | 12 | 14 | 14 | 13 | 15 | 15 | 13 |
Feels °C | 8 | 11 | 10 | 10 | 9 | 12 | 14 | 12 | 9 | 10 | 10 | 10 | 10 | 9 | 10 | 10 | 10 | 13 | 13 | 11 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 12 | SSW 16 | SSW 15 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SW 11 | SW 13 | SW 12 | SW 16 | SW 14 | SW 17 | SSW 16 | SSW 15 | SSW 16 | SSW 15 |
1396 | 994 | 426 | 1531 | 807 | 742 | 573 | 519 | 314 | 279 | 544 | 529 | 379 | 1317 | 1491 | 2512 | 2206 | 2016 | 3074 | 2479 | |
Swell 2 Height (m) Direction Period (s) | — | S 26 | SSW 16 | SSW 22 | SSW 19 | SW 13 | SW 13 | — | W 5 | SSW 20 | SSW 18 | SSW 16 | SSW 16 | SW 20 | SSW 18 | SSW 17 | — | — | — | SSW 20 |
— | 13 | 659 | 185 | 480 | 253 | 180 | — | 1 | 41 | 214 | 326 | 318 | 61 | 565 | 2102 | — | — | — | 157 | |
Swell 3 Height (m) Direction Period (s) | — | — | SSW 24 | — | S 10 | — | — | — | — | WSW 9 | SSW 14 | WSW 13 | — | WSW 20 | SSW 18 | — | — | — | — | — |
— | — | 55 | — | 30 | — | — | — | — | 7 | 125 | 108 | — | 259 | 874 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | SE 3 | ENE 3 | ENE 4 | NE 4 | NE 4 | NE 4 | NNE 4 | NW 3 | W 6 | — | — | NW 4 | — | — | — | — | — | — | NW 3 |
— | 2 | 9 | 7 | 51 | 29 | 12 | 35 | 5 | 40 | — | — | 5 | — | — | — | — | — | — | 6 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 164 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 404 | 0 | 2 | 578 | 2 | 1 | 3 | 1 | 2 | 5 | 0 |
Best forecast wave conditions in South Australia - East Coast | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
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Information about the Knights Surf forecast
The above surf forecast table for Knights provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Knights can be found by selecting the local surf guide option on the grey menu. Our Knights 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 (Knights) 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 Knights 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.











