Surf Forecasts:
Knights surf forecast from 20 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 9PM (local time) - 11ft (3.5m), 14s period, SW swell with onshore winds.
- Most powerful swell: Tuesday 25 Aug, 9PM (local time) - 11ft (3.5m), 14s period, SW swell with 4,590 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 9PM (local time) - 8ft (2.5m), 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 Saturday (Aug 22) at 9PM. The primary swell is predicted to be 2.5m and 14s period with a secondary swell of 0.7m and 20s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Knights in the next 16 days are 3.5m 14s and forecast to arrive on Tuesday (Aug 25) at 9PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Friday (Aug 28) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 22nd Aug) | 8ft (2.5m) 14s |
| Best Surf | 9PM (Tue 25th Aug) | 11ft (3.5m) 14s |
| Most Powerful | 9PM (Tue 25th Aug) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, Rusty here, checking in on the Knights break.
We've got a solid run of surf coming through, but the first few days are a bit of a mixed bag. Friday the 21st and Saturday the 22nd are a bit of a write-off with messy winds and jumbled swell. The energy is moderate to strong, but it's not worth the paddle.
Sunday the 23rd is where it starts to get good. The morning brings a clean offshore breeze from the north, and we've got a solid 7ft SW swell at 14 seconds. The energy is strong, and the conditions are excellent for experienced surfers. The afternoon is even better, with a clean cross-offshore breeze and a 7ft SSW groundswell with a very long 16-second period. That's a standout session.
Monday the 24th still has clean waves in the morning, with a 5ft SSW swell and a light cross-offshore breeze. The energy drops to moderate, but it's still a good session. The afternoon gets a bit weaker, so morning is the call.
Tuesday the 25th is a total loss. Strong onshore winds and a big, messy 10ft SW swell. The energy is huge, but it's a washing machine. Not for paddling. Wednesday the 26th is average, and Thursday the 27th is a nice surprise. The afternoon brings a 4ft SSW swell with a very long 20-second period and clean cross-offshore winds. The energy is moderate, but the long period will make for some beautifully lined-up waves.
The end of August and start of September are a bit of a mixed bag. There's a gap of a few days with nothing that grabs you, but then we get to the 1st of September. The morning has a big 8ft SW swell with a 17-second period, and while the wind is cross-onshore, it's light. The energy is massive, and it's the highest-rated option in the whole outlook. This is the big one, but it's a week and a half out, so keep an eye on the forecasts.
The 2nd, 3rd, and 4th of September are all looking clean and consistent. But the 4th of September is a real standout. The morning has a 10ft SSW groundswell with an 18-second period and clean cross-offshore winds. The energy is massive. This is a big groundswell, so it'll be best for the point and reef, but it's for experts only. The 5th of September looks like it turns sloppy again.
The water temp is about average for this time of year, so no need for a thick suit.
The real standout windows are Sunday the 23rd, Thursday the 27th, and the whole run from the 1st to the 4th of September. Mark your calendar for the 4th of September morning – that's the one to chase.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Sun afternoon, min 10°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Mon night. Very mild (max 19°C on Mon morning, min 10°C on Tue night). Winds increasing (light winds from the NW on Mon morning, fresh winds from the S by Tue morning). | ||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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 14 | SW 14 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SW 16 | SSW 14 | SSW 13 | SSW 13 | SSW 11 |
Wave Graph  | |||||||||||||||||||
 kJ | 832 | 1649 | 1271 | 2785 | 2837 | 2274 | 2553 | 1772 | 2479 | 1393 | 982 | 710 | 734 | 1622 | 3903 | 2721 | 1475 | 1100 | 483 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-on | on | cross-off | off | cross-off | cross-off | cross-off | cross-on | cross | cross-on | on | on | on | cross-on | cross-off |
High Tide | 5:04AM1.04m | 6:12AM0.99m | 11:23AM1.13m | 11:44AM1.18m | 00:40AM0.59m | 12:05PM1.20m | 00:37AM0.61m | 12:27PM1.20m | 00:45AM0.65m | ||||||||||
Low Tide | 8:38AM0.94m | 9:06PM0.42m | 7:35AM0.99m | 9:02PM0.45m | 8:54PM0.45m | 8:42PM0.45m | 8:26PM0.43m | 4:30AM0.48m | 8:08PM0.40m | ||||||||||
 |  | | |  | | | | |  |  |  |  | | | | | | | |
 | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:46 | — | — | 6:45 | — | — | 6:43 | — | — |
 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — | — | 5:50 | — | — | 5:50 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 4 | 2 | — | — | — | — | — |
Temp °C | 12 | 14 | 14 | 14 | 15 | 14 | 12 | 16 | 17 | 14 | 19 | 17 | 12 | 13 | 12 | 12 | 12 | 12 | 9 |
Feels °C | 10 | 10 | 10 | 11 | 12 | 12 | 11 | 14 | 15 | 12 | 17 | 15 | 11 | 7 | 7 | 6 | 8 | 9 | 6 |
Swell 1 Height (m) Direction Period (s) | SW 11 | SW 14 | SW 14 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 16 | SW 16 | SSW 14 | SSW 13 | SSW 13 | SSW 11 |
| kJ | 457 | 1649 | 1271 | 2785 | 2837 | 2274 | 2553 | 1772 | 2479 | 1393 | 982 | 710 | 734 | 691 | 3903 | 2721 | 1475 | 1100 | 483 |
Swell 2 Height (m) Direction Period (s) | SSW 16 | SW 18 | SSW 18 | — | SSW 24 | SSW 21 | SSW 19 | SSW 18 | — | — | SW 20 | SW 20 | SW 18 | SW 16 | — | WSW 14 | — | — | SSW 16 |
| kJ | 832 | 338 | 534 | — | 54 | 305 | 590 | 759 | — | — | 15 | 15 | 82 | 1137 | — | 796 | — | — | 171 |
Swell 3 Height (m) Direction Period (s) | — | SW 18 | SSW 18 | — | — | SW 21 | SW 20 | — | — | — | — | WSW 20 | WSW 18 | — | — | — | — | — | SW 25 |
| kJ | — | 703 | 497 | — | — | 117 | 388 | — | — | — | — | 37 | 126 | — | — | — | — | — | 24 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | NNE 3 | NW 3 | — | SSW 13 | — | — | — | WNW 2 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — | 1622 | — | — | — | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1 | 1 | 2 | 1 | 2 | 157 | 0 | 0 | 0 | 0 | 0 | 9 | 137 | 137 | 137 | 137 | 137 | 2 | 0 |
Best forecast wave conditions in South Australia - East Coast | |||||||||||||||||||
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)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Knights surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest