Surf Forecasts:
Knights surf forecast from 19 Aug 2026:
- Best quality surf: Saturday 22 Aug, 9PM (local time) - 7ft (2.2m), 14s period, SSW swell with glassy winds.
- Most powerful swell: Saturday 22 Aug, 6AM (local time) - 8ft (2.5m), 16s period, SW swell with 3,001 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 3AM (local time) - 3.5ft (1.1m), 13s period with SW 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 Thursday (Aug 20) at 3AM. The primary swell is predicted to be 1.1m and 13s period with a secondary swell of 0.9m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Knights in the next 16 days are 2.5m 16s and forecast to arrive on Saturday (Aug 22) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Thursday (Aug 20) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 20th Aug) | 3.5ft (1.1m) 13s |
| Best Surf | 9PM (Sat 22nd Aug) | 7ft (2.2m) 14s |
| Most Powerful | 6AM (Sat 22nd Aug) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, let’s get into it. The next couple of weeks are a bit of a mixed bag, but there’s some proper juice on the horizon if you're willing to be patient. We're looking at a stretch that starts slow, gets real interesting around the weekend, and then has a week and a half of solid, workable surf with one standout window that could be something special.
First things first, the earliest we see anything worthwhile is Friday the 21st. The swell bumps up to 6.2ft from the SW with a 14-second period. The energy is moderate, coming in at 2599, but the cross-offshore wind is going to put some chop on it. It's not perfect, but it’s a solid start after a couple of flat-feeling days.
Saturday the 22nd pushes a bit more size, with 7.5ft from the SSW. The period drops a touch to 15 seconds on the morning, but the wind is light cross-onshore. Energy is still moderate, hitting 2671. It's rideable, but the onshore component keeps it from being truly clean.
Now, here’s where it starts to get good. Sunday the 23rd, the wind finally plays nice. We've got a light offshore breeze from the N at just 3 mph. The swell settles to a clean 6.2ft from the SSW with a 14-second period, energy at 2026. This is a solid, clean day with good shape for the more experienced crew. This is the first day that’s really worth getting excited about.
Monday the 24th is still okay, dropping to 3.6ft in the morning with clean conditions. It's a smaller day, but the wind is light and cross-off, so if you're after a longboard wave, it might be there. Energy drops off to 716, so expect it to be a bit weaker.
Then we get a bit of a wildcard on Tuesday the 25th. The morning is blown-out with onshore SSW wind at 12 mph and a period of just 12 seconds. It’s going to be messy. The afternoon sees the wind pick up to 16 mph and the swell jump to 7.5ft, but the quality is just poor. This looks way more interesting for the kite crew than for us paddle surfers. Forget it.
Wednesday the 26th is a proper comeback. Morning has a cross-offshore wind from the E at 6 mph and a 7.2ft SSW swell. Energy is 1507. The afternoon though, that’s the gem. Glassy conditions, a slight air, wind at just 3 mph from the SSW and a clean 6.2ft swell. That's the best conditions of the week right there. Clean, glassy, and a good size. This one gets a big tick from me.
Thursday the 27th is a bit all over the shop. Morning is tiny at 2.3ft, but the afternoon jumps to 6.9ft from the SW with a clean cross-off breeze. It's a bit of a gamble, but the afternoon has potential.
Now, hold on to your boardies, because Friday the 28th is the standout of this entire outlook. The morning brings a 9.8ft SSW groundswell with a 17-second period. The energy reading is a huge 7401. And the wind is light from the NNW. This is serious. This is a big, powerful, long-period groundswell. The takeoff will be heavy. The afternoon sees the swell bump to 11.5ft, but that is just too big for this break. Saturday and Sunday the 29th and 30th will have the same issue – waves in the 11.5ft to 13ft range are only for experts, and even then, it's a lot. The wind is cross-offshore, which is good, but the size is intimidating. For the average punter, it’s a beach day, or a boat day to watch the show.
After that monster, we settle back down. Sunday afternoon the 30th drops to 6.6ft from the S with a lighter period of 11 seconds and a light cross-off breeze. It’s a good, clean session for experienced surfers. Monday the 31st offers up 5.2ft from the SSW with a 16-second period. The winds are light in the afternoon and offshore from the NE. That's a nice one. Another good day on Tuesday September 1st too, with 3.9ft in the morning, easing through the day.
The first week of September looks clean, but small. We’re talking 2.9ft to 3.9ft swells. There’s plenty of clean surf for the intermediates on a longboard or a fish, especially with those longer periods and light winds. The energy drops right down, so don't expect any power.
One thing to note, the water temp on the first day is 57.4°, which is just about spot-on for this time of year. No real surprises there.
Knights is a beach and reef setup that’s "fairly consistent" and leans towards
Short Range ForecastSome drizzle, heaviest during Thu afternoon. Very mild (max 15°C on Thu morning, min 11°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 16°C on Sun morning, min 10°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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 16 | WSW 13 | SW 16 | SW 14 | SW 15 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 14 | SSW 14 |
Wave Graph | |||||||||||||||||||
465 | 322 | 620 | 1552 | 1368 | 1486 | 2785 | 2800 | 2274 | 1987 | 1629 | 2285 | 1412 | 934 | 820 | 1226 | 1281 | 1560 | 1230 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross | cross | cross | cross-on | cross | cross-on | on | cross-off | off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on |
High Tide | 4:20AM1.07m | 2:36PM0.94m | 5:04AM1.04m | 6:12AM0.99m | 11:23AM1.13m | 11:44AM1.18m | 00:40AM0.59m | 12:05PM1.20m | 00:37AM0.61m | ||||||||||
Low Tide | 9:14AM0.83m | 9:03PM0.40m | 8:38AM0.94m | 9:06PM0.42m | 7:35AM0.99m | 9:02PM0.45m | 8:54PM0.45m | 8:42PM0.45m | 8:26PM0.43m | ||||||||||
— | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:46 | — | — | 6:45 | — | — | |
— | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — | — | 5:50 | — | |
mm | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 15 | 15 | 13 | 14 | 15 | 14 | 14 | 14 | 12 | 16 | 16 | 14 | 16 | 16 | 12 | 13 | 12 | 10 |
Feels °C | 10 | 9 | 11 | 11 | 10 | 12 | 12 | 11 | 12 | 11 | 13 | 12 | 12 | 13 | 13 | 10 | 9 | 7 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SSW 16 | SW 16 | SW 14 | SW 15 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 14 | SSW 14 |
465 | 277 | 322 | 1552 | 1368 | 1486 | 2785 | 2800 | 2274 | 1987 | 1629 | 2285 | 1412 | 934 | 820 | 1226 | 1281 | 1560 | 1230 | |
Swell 2 Height (m) Direction Period (s) | SW 18 | SSW 16 | SW 13 | SSW 16 | SSW 17 | SSW 18 | — | SSW 23 | SSW 21 | SSW 19 | SSW 18 | — | — | SW 20 | SSW 20 | SSW 18 | SW 16 | WSW 16 | WSW 14 |
162 | 322 | 245 | 801 | 528 | 404 | — | 54 | 305 | 650 | 751 | — | — | 15 | 37 | 124 | 376 | 506 | 763 | |
Swell 3 Height (m) Direction Period (s) | SW 18 | SW 7 | — | WSW 16 | SW 18 | SSW 18 | — | — | SW 21 | — | — | — | — | SW 20 | — | WSW 18 | SSW 16 | — | — |
164 | 59 | — | 788 | 703 | 497 | — | — | 117 | — | — | — | — | 15 | — | 124 | 334 | — | — | |
Wind waves Height (m) Direction Period (s) | WSW 7 | NW 3 | WSW 13 | SW 11 | — | — | — | — | — | — | — | — | — | WNW 3 | — | — | — | — | — |
127 | 5 | 620 | 445 | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 577 | 1 | 2 | 33 | 2 | 2 | 2 | 1 | 2 | 33 | 0 | 0 | 0 | 0 | 0 | 2 | 137 | 137 | 137 |
Best forecast wave conditions in South Australia - East Coast | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











