Surf Forecasts:
Knights surf forecast from 2 Sep 2026:
- Best quality surf: Thursday 3 Sep, 3PM (local time) - 11ft (3.5m), 14s period, SSW swell with cross-onshore winds.
- Most powerful swell: Wednesday 9 Sep, 3PM (local time) - 11ft (3.5m), 18s period, SSW swell with 8,072 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 3PM (local time) - 11ft (3.5m), 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 Thursday (Sep 03) at 3PM. The primary swell is predicted to be 3.5m and 14s period. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Knights in the next 16 days are 3.5m 18s and forecast to arrive on Wednesday (Sep 09) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Saturday (Sep 05) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Thu 3rd Sep) | 11ft (3.5m) 14s |
| Best Surf | 3PM (Thu 3rd Sep) | 11ft (3.5m) 14s |
| Most Powerful | 3PM (Wed 9th Sep) | 11ft (3.5m) 18s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
G’day, Rusty here, and I’ve got a look at what’s shaping up for the next couple of weeks. There’s a heap of swell on the way, but it’s not all going to be easy to get into. We’ve got a bit of a gap before the real action starts, so let’s talk it through.
First up, the main event for this whole forecast is at Knights. This is an advanced spot, fairly consistent, and it’s totally exposed to the swell – it grabs everything that comes through. The water’s sitting at about 59°F, which is pretty normal for this time of year, so don’t stress about a cold snap.
The first real standout is going to be Sunday the 6th of September. That morning, we’ve got a solid 8ft groundswell rolling in from the SSW with a long 13-second period, and the wind is dead flat – glassy. The combined energy is sitting at 2211, which is proper moderate. For an experienced surfer, this is as good as it gets. The swell is a bit big for beginners, but for the crew who know what they’re doing, it’ll be clean and powerful. The afternoon drops off a bit with a cross-onshore breeze, so that morning window is the one.
The next absolute gem is Tuesday the 8th of September. Another morning glass-off, with a 8ft swell from the SSW, but this time the period is a massive 17 seconds – that’s proper groundswell, the kind that hums. Combined energy is 3063, so there’s plenty of push. Just bear in mind that with a period that long, the swell can be a bit straight at a beach break, but Knights is a mix of beach and reef, so it should handle it fine. This is the best on offer for the whole stretch.
There’s a bit of a lull from the 9th through the 12th – the swell stays big, well over 10ft, but the wind is mostly cross-on or onshore, making it a messy, lumpy mess. Not worth paddling out unless you’re a glutton for punishment. The 10th of September has decent swell and clean conditions, but the swell is 13ft – that’s expert-only territory, and even then, it’s a big call.
After that, things settle down. The 11th of September morning has a nice 7ft swell with offshore winds – clean and fun for those who can handle the size. The 14th and 15th of September are smaller, around 5ft and 3ft, with clean conditions, but the energy is low. It’s more of a longboard or cruiser session.
Looking further out, the 17th of September shows a fresh 8ft to 10ft swell from the SW/SSW, but the wind is cross-shore, so there’ll be some chop. Promising, but not locked in yet.
So, if you’re picking your days, lock in Sunday the 6th and Tuesday the 8th of September mornings. Those are the standouts. Everything else is either too big, too windy, or just not quite there. The blanks? There’s a few days in the middle where I wouldn’t bother. But for an advanced spot like this, it’s a solid run of swell.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Thu morning. Very mild (max 17°C on Fri afternoon, min 10°C on Thu night). Winds increasing (calm on Thu afternoon, fresh winds from the WNW by Fri night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 15°C on Mon morning, min 10°C on Sat night). Winds decreasing (fresh winds from the W on Sat morning, calm by Sun morning). | ||||||||||||||||||||
Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | |||||||||||||||
AM | 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 | SW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 16 | SSW 16 | SSW 15 | SW 12 | SSW 13 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 19 | SSW 17 | SSW 17 | SSW 16 |
Wave Graph | |||||||||||||||||||||
2510 | 2547 | 3009 | 3709 | 4767 | 5723 | 5368 | 4471 | 2945 | 4563 | 4865 | 3460 | 2211 | 1551 | 972 | 669 | 528 | 1135 | 3063 | 2997 | 1650 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-on | cross-on | cross-off | off | cross-off | cross | cross-on | cross-on | cross | glassy | cross-on | on | cross-off | cross | cross-off | glassy | on | cross-on |
High Tide | 2:31PM0.88m | 3:29AM1.14m | 2:17PM0.85m | 4:04AM1.13m | 12:35PM0.87m | 4:47AM1.08m | 5:54AM1.00m | 11:43AM1.19m | 12:08PM1.21m | 00:51AM0.61m | |||||||||||
Low Tide | 8:03PM0.33m | 9:12AM0.69m | 8:08PM0.32m | 9:13AM0.85m | 8:14PM0.31m | 8:22AM0.97m | 8:22PM0.31m | 7:17AM0.99m | 8:30PM0.33m | 8:36PM0.36m | 8:36PM0.41m | ||||||||||
6:33 | — | — | 6:33 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | |
— | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | |
mm | — | — | — | 1 | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | 1 | — |
Temp °C | 14 | 14 | 14 | 14 | 14 | 11 | 14 | 17 | 17 | 14 | 14 | 12 | 14 | 14 | 12 | 15 | 14 | 11 | 13 | 12 | 12 |
Feels °C | 10 | 9 | 10 | 10 | 10 | 9 | 12 | 11 | 11 | 7 | 9 | 9 | 12 | 11 | 10 | 13 | 11 | 9 | 12 | 10 | 9 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 15 | SW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 16 | SSW 16 | SSW 15 | — | SSW 13 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 17 | SSW 17 | SSW 16 |
2510 | 2547 | 3009 | 3709 | 4767 | 5723 | 5368 | 4471 | 2945 | — | 4865 | 3460 | 2211 | 1551 | 972 | 669 | 528 | 603 | 3063 | 2997 | 1650 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 24 | SSW 22 | SSW 21 | SSW 19 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | 11 | 46 | 294 | 1135 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WSW 21 | SSW 14 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 171 | 133 | — | — | — | |
Wind waves Height (m) Direction Period (s) | SW 6 | — | NW 4 | — | — | — | NNE 4 | — | WNW 4 | SW 12 | — | — | — | — | — | ESE 3 | E 3 | — | — | SE 4 | SSE 6 |
54 | — | 7 | — | — | — | 16 | — | 43 | 4563 | — | — | — | — | — | 6 | 8 | — | — | 44 | 212 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 404 | 577 | 591 | 5 | 1 | 1 | 173 | 931 | 1029 | 1114 | 1 | 0 | 33 | 137 | 0 | 168 | 0 | 0 | 137 | 585 |
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.











