
Surf Forecasts:
Knights surf forecast from 11 Sep 2026:
- Best quality surf: Saturday 12 Sep, 9AM (local time) - 7ft (2.1m), 15s period, SSW swell with offshore winds.
- Most powerful swell: Tuesday 15 Sep, 6PM (local time) - 11ft (3.5m), 14s period, SSW swell with 5,553 kJ wave energy.
- Next surfable swell (1★+): Saturday 12 Sep, 9AM (local time) - 7ft (2.1m), 15s 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 (Sep 12) at 9AM. The primary swell is predicted to be 2.1m and 15s period. The wind is predicted to be offshore 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 (Sep 15) 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 3s period and expected on Saturday (Sep 12) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Sat 12th Sep) | 7ft (2.1m) 15s |
| Best Surf | 9AM (Sat 12th Sep) | 7ft (2.1m) 15s |
| Most Powerful | 6PM (Tue 15th Sep) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s get straight into it.
We’ve got one main spot lighting up the 16-day window, and it’s a big one for the experienced crew – Knights. This break is a beach and reef setup, fairly consistent, and it’s going to be a tale of two halves, with some proper clean sessions mixed with wild, churning conditions.
The combined swell energy runs from a low of 240 up to a massive 8362, so the ocean has some serious power.
The first standout is Saturday the 12th. Morning at Knights sees a clean 6.9 ft swell from the SSW, with a super long period of 15 seconds – that’s proper groundswell energy. The wind is a light offshore from the NNE at just 6 mph, so expect glassy, lined-up waves. The water temp is sitting at 58.1°, which is bang on average for this time of year. The combined energy is 1976, a solid session. This is an advanced-only wave with 6.9 ft, so beginners will want to sit this one out. The period is long (15 seconds), which means these waves will hold their shape well, but at a beach-break setup like this, you might find them standing up a bit straight. It’s ideal, really. Crowds are a possibility here – it says “often,” so expect company for the good ones.
Sunday morning the 13th still has quality: a clean 4.3 ft swell from the SSW, 16-second period (very long period groundswell), and a 12 mph offshore from the north. That’s a solid breeze holding the face open, but by the afternoon the wind switches, and it gets messy with a strong cross-shore (16 mph from the west). The combined energy drops to 768 and 904 respectively. The morning is your window.
Monday the 14th and Tuesday the 15th are a write-off. The swell jumps big on Tuesday – 11.5 ft and 9.8 ft from the SW – but it’s hammered by onshore winds at 16 to 16 mph from the south and SSW, creating churned‑out, poor conditions. The combined energy is huge (8675 on Tuesday morning), but only kitesurfers would be getting stoked on that chaos.
Wednesday the 16th and Thursday the 17th see the swell still solid (9.8 ft and 7.2 ft), but the wind finally cleans up. Thursday is the real gem – a light 6 mph cross-off breeze from the ENE, clean conditions, and a 7.2 ft SSW swell at 14 seconds. The combined energy sits at 1910, and the wave comment says “excellent surf for experienced surfers.” That’s your next clear session. It’s a proper, clean, heavy wave for the advanced crowd.
The second half of the window – from Friday the 18th through Monday the 21st – is patchy. The 18th has some fun, clean 3.3 ft to 3.9 ft waves with a very long 17-second period, but the combined energy is lower around 846-867. It’s clean but weak. Saturday the 19th is a blowout with 19 to 22 mph cross-off winds and tiny waves (3.0 ft). Sunday is small and choppy.
The true big-water highlight lands on Tuesday the 22nd. The morning shows a massive 13.1 ft SSW swell, 16-second period, combined energy of 8362, and a light 6 mph cross-off from the ENE. The wind and tide are favorable – but the swell is simply too big for this break. This is not a surfer’s session unless you’re on a big wave gun and know the lineup inside out. That’s an expert-only, massive day.
From Wednesday the 23rd to Saturday the 26th, there’s a mix. Wednesday the 23rd is clean with a solid 8.2 ft swell (SSW, 14 seconds), cross-off wind from the north, and combined energy around 2487, but the wave comment flags it as “marginal surf or questionable tide.” Still, it looks cleaner than much of the rest. Saturday the 26th morning brings back a clean 6.6 ft, 16-second swell, cross-off breeze from the ENE at 9 mph, with combined energy at 2568. That’s a well-shaped, clean groundswell for experienced surfers.
The true standout of the entire forecast is the final window – Sunday the 27th. The morning delivers a solid 9.8 ft groundswell, 16-second period, and a strong offshore from the north at 16 mph. Combined energy is 6730. The wave comment says it’s “marginal surf or questionable tide conditions,” but it’s clean and powerful. Even better, the Sunday afternoon shows 11.5 ft at 17 seconds with a 12 mph offshore from the north, combined energy of 7077. Again, the comment flags the swell as too big for this break, but for the high-end crew, that’s a world-class session if you’re wired in.
So, to wrap it
Short Range ForecastLight rain (total 2mm), mostly falling on Sun morning. Warm (max 22°C on Sat morning, min 12°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 16°C on Thu afternoon, min 5°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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 15 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SSW 14 | SSW 14 | SW 13 | SW 12 | SW 15 | SSW 14 | SSW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | SSW 17 | SSW 17 | SSW 16 |
Wave Graph | |||||||||||||||||||||
1976 | 1450 | 1081 | 904 | 768 | 515 | 323 | 230 | 403 | 5085 | 3709 | 3578 | 3783 | 3553 | 3618 | 1910 | 1267 | 852 | 524 | 867 | 506 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | cross | cross | cross-on | cross-on | on | on | on | cross-on | cross | cross-on | cross | cross-off | cross-off | off | cross-off | cross-off | cross-off |
High Tide | 1:20PM1.00m | 1:23AM0.98m | 1:33PM0.94m | 1:48AM1.06m | 1:45PM0.90m | 2:15AM1.12m | 1:56PM0.88m | 2:44AM1.15m | 2:04PM0.86m | 3:14AM1.14m | 2:04PM0.84m | 3:46AM1.10m | 1:40PM0.82m | ||||||||
Low Tide | 7:10PM0.40m | 7:17AM0.34m | 7:11PM0.33m | 7:46AM0.39m | 7:20PM0.28m | 8:13AM0.46m | 7:33PM0.25m | 8:39AM0.56m | 7:47PM0.24m | 9:02AM0.66m | 8:00PM0.26m | 9:18AM0.76m | 8:09PM0.29m | ||||||||
6:20 | — | — | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | |
— | 6:02 | — | — | 6:04 | — | — | 6:04 | — | — | 6:05 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | |
mm | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 22 | 20 | 16 | 17 | 13 | 16 | 16 | 16 | 13 | 12 | 12 | 10 | 10 | 10 | 13 | 16 | 14 | 18 | 19 | 18 |
Feels °C | 19 | 19 | 16 | 13 | 12 | 11 | 14 | 14 | 14 | 6 | 6 | 5 | 5 | 5 | 6 | 9 | 13 | 12 | 13 | 15 | 14 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SSW 14 | SSW 14 | SW 13 | SSW 17 | SW 15 | SSW 14 | SSW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 17 | SSW 16 |
1976 | 1450 | 1081 | 904 | 768 | 515 | 323 | 230 | 197 | 5085 | 3709 | 3578 | 3783 | 3553 | 3618 | 1910 | 1267 | 852 | 322 | 867 | 506 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | S 21 | SSW 19 | SW 18 | — | — | — | — | — | — | — | — | — | — | SSW 17 | — | — |
— | — | — | — | — | 9 | 73 | 82 | — | — | — | — | — | — | — | — | — | — | 524 | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | WSW 20 | WSW 18 | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | 37 | 63 | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | NNE 3 | NE 3 | NE 3 | NW 3 | WNW 3 | SW 6 | SW 5 | SW 5 | SW 12 | SSW 15 | — | — | — | — | — | — | — | — | NNW 3 | NW 3 | NNW 3 |
7 | 4 | 6 | 6 | 7 | 69 | 45 | 40 | 403 | 3590 | — | — | — | — | — | — | — | — | 2 | 2 | 2 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 247 | 2 | 411 | 2 | 519 | 167 | 167 | 137 | 164 | 164 | 137 | 0 | 0 | 0 | 2 | 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.










