
Surf Forecasts:
Knights surf forecast from 6 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 9PM (local time) - 15ft (4.5m), 17s period, SSW swell with cross-onshore winds.
- Most powerful swell: Wednesday 9 Sep, 6PM (local time) - 15ft (4.5m), 17s period, SSW swell with 10,834 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 3AM (local time) - 4.5ft (1.4m), 18s 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 Tuesday (Sep 08) at 3AM. The primary swell is predicted to be 1.4m and 18s period with a secondary swell of 1.6m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Knights in the next 16 days are 4.5m 17s and forecast to arrive on Wednesday (Sep 09) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Saturday (Sep 12) at 12PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Tue 8th Sep) | 4.5ft (1.4m) 18s |
| Best Surf | 9PM (Wed 9th Sep) | 15ft (4.5m) 17s |
| Most Powerful | 6PM (Wed 9th Sep) | 15ft (4.5m) 17s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Ah, g’day crew, Rusty here. Let’s have a proper look at what Knights (beach and reef) has got cooking for us over the next couple of weeks. The water is sitting at a pretty average 58°F, no real drama there, about what you’d expect for this time of year.
We’re starting off with a bit of a slow burn, honestly. The first couple of days into the forecast are a write-off for a decent session. Sunday the 6th is a write-off: onshore winds, lumpy, and the swell’s on the way up but messy. Monday the 7th is even worse, with strong onshore wind and weak, chopped-up waves. Just don’t bother.
But then, things take a proper turn. Tuesday the 8th morning is our first real standout. The wind goes glassy, dead calm, and we’ve got a solid 7ft swell from the SSW with a proper 17-second period – that’s long-period groundswell, meaning heaps of energy and beautiful shape on the reef/point. The combined energy is a beefy 3758 (moderate to strong). This is an advanced wave, over 5ft, so it’s not for the grommets, but for anyone who knows what they’re doing, it’s going to be world-class clean. The afternoon goes to crap with onshore wind, so get it while it’s glassy.
The middle of the week turns nasty. Wednesday the 9th is a full-on mess with 30 km/h cross-onshore winds and lumpy, oversized swell (13ft in the afternoon). That’s more of a kite-surfing day than a paddle session. Thursday the 10th has a massive 12ft swell but with cross-onshore wind and it’s just too big and messy for this spot – a real shame.
Now, a true hidden gem pops up for the end of the week. Friday the 11th and Saturday the 12th mornings bring a fantastic window. We get clean, cross-offshore winds (light breeze from the east and then offshore from the NNE), and a solid 8ft to 6ft SSW swell with a period of 14-15 seconds. The energy is moderate to strong (2197 and 1346), and the water will be clean as a whistle. The Saturday morning in particular has true offshore wind – that’s the stuff dreams are made of. Crowds are likely here often, so you’ll want to be an early bird.
The following week starts to get messy again. Sunday the 13th has cleaner but smaller surf, and then Monday the 14th is blown out by strong westerly winds. Tuesday the 15th morning offers another huge, glassy moment – 12ft from the SSW with a 16-second period and dead calm winds. The energy is massive (5587), but for the same reason as before, this is a serious, serious wave. It’s predicted to be too big for this break unless you’re an absolute expert. It’s a high-risk, high-reward window.
We get a bit of a lull mid-week, but then Thursday the 17th afternoon is another solid call – 7ft from the SSW, 16-second period, and a moderate offshore wind from the NNE. The combined energy is strong (2355) and it will be clean. For experienced surfers who can handle a bit of wind, this is a goer.
The final weekend (20th and 21st September) sees the swell drop and get a bit mixed with cross-shore winds, but then we finish on a high note. Monday the 21st afternoon is glassy again with a 8ft SSW swell, though the period drops to just 8 seconds – that’s short-period wind swell, so the shape won’t be as good as the groundswells earlier, but it’ll be clean and fun for those who can handle the size.
Overall, the best of the best is Tuesday the 8th morning for pure glassy perfection, and Friday the 11th/Saturday the 12th mornings for clean, powerful, surfable waves for the experienced crew. The rest of the period is a mixed bag of too-big washouts and blown-out days. Don’t sleep on that Tuesday morning.
Rusty.
Short Range ForecastMostly dry. Very mild (max 14°C on Sun morning, min 8°C on Mon night). Winds increasing (calm on Tue morning, fresh winds from the S by Tue night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 16°C on Fri afternoon, min 9°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | |||||||||||||||
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 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 19 | SSW 17 | SSW 17 | SSW 16 | SSW 20 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 17 |
Wave Graph | |||||||||||||||||||||
2334 | 1597 | 1100 | 787 | 624 | 983 | 2737 | 2551 | 2479 | 2659 | 10253 | 9894 | 6473 | 4821 | 3135 | 2197 | 1997 | 2599 | 1346 | 834 | 516 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | cross-on | cross | glassy | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | off | off | cross-off | cross-off |
High Tide | 11:19AM1.12m | 11:43AM1.19m | 12:08PM1.21m | 00:51AM0.61m | 12:30PM1.19m | 00:40AM0.68m | 12:49PM1.13m | 00:46AM0.77m | 1:06PM1.06m | 1:02AM0.88m | 1:20PM1.00m | 1:23AM0.98m | |||||||||
Low Tide | 8:30PM0.33m | 8:36PM0.36m | 8:36PM0.41m | 4:25AM0.53m | 8:21PM0.46m | 5:29AM0.43m | 7:50PM0.48m | 6:11AM0.36m | 7:22PM0.45m | 6:46AM0.33m | 7:10PM0.40m | ||||||||||
6:28 | — | — | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | |
— | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:02 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 14 | 13 | 14 | 13 | 10 | 13 | 11 | 12 | 11 | 11 | 10 | 12 | 12 | 11 | 14 | 16 | 14 | 21 | 20 | 19 |
Feels °C | 12 | 11 | 12 | 11 | 10 | 8 | 11 | 7 | 6 | 4 | 5 | 6 | 8 | 8 | 9 | 11 | 14 | 12 | 18 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 17 |
2334 | 1597 | 1100 | 787 | 624 | 749 | 2737 | 2551 | 2479 | 2325 | 10253 | 9894 | 6473 | 4821 | 3135 | 2197 | 1997 | 2599 | 1346 | 834 | 516 | |
Swell 2 Height (m) Direction Period (s) | — | — | S 23 | SSW 22 | SSW 21 | SSW 19 | WSW 18 | — | — | SSW 20 | — | — | — | — | — | — | — | — | — | SSW 19 | SSW 13 |
— | — | 11 | 45 | 283 | 983 | 1021 | — | — | 2659 | — | — | — | — | — | — | — | — | — | 140 | 257 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | WSW 20 | SSW 14 | — | — | — | — | — | — | — | — | — | — | — | — | — | NE 3 | SW 15 |
— | — | — | — | 163 | 77 | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 57 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SSW 5 | S 8 | — | — | — | — | — | — | — | — | NE 3 | — | NNE 2 |
— | — | — | — | — | — | — | — | 61 | 825 | — | — | — | — | — | — | — | — | 5 | — | 1 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 33 | 137 | 137 | 137 | 137 | 0 | 0 | 137 | 167 | 1060 | 1691 | 137 | 137 | 137 | 0 | 0 | 0 | 0 | 0 | 0 | 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.










