Surf Forecasts:
Knights surf forecast from 7 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 9AM (local time) - 13ft (4.0m), 19s period, SSW swell with cross-onshore winds.
- Most powerful swell: Wednesday 9 Sep, 9AM (local time) - 13ft (4.0m), 19s period, SSW swell with 11,350 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 12AM (local time) - 4ft (1.2m), 19s 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 12AM. The primary swell is predicted to be 1.2m and 19s period with a secondary swell of 1.7m and 12s. 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 4.0m 19s and forecast to arrive on Wednesday (Sep 09) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Sunday (Sep 13) at 3PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 8th Sep) | 4ft (1.2m) 19s |
| Best Surf | 9AM (Wed 9th Sep) | 13ft (4.0m) 19s |
| Most Powerful | 9AM (Wed 9th Sep) | 13ft (4.0m) 19s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s talk about this 16-day stretch. It’s not a flat spell, but you gotta know where to look. The real gems are for the experienced crew, and they’re spread out.
First decent surf pops up on Monday, September 7th, but it’s rough. Swell is 6ft from the SSW with a 13-second period, but the wind is a cross-onshore mess from the SSE at 12 mph, making it choppy. Combined energy is 1421 (moderate). That’s a pass.
The absolute standout is Tuesday, September 8th, morning. Swell is 7ft from the SSW, period is a very long 17 seconds, and the wind is glassy from the ENE at just 3 mph. Combined energy is massive at 3758 (strong). For experienced surfers, this is excellent. Water temp is 58°, which is average for the time of year. This is the best of the whole forecast.
Wednesday, September 9th, morning is a monster. Swell is 13ft from the SSW, period is 19 seconds, and combined energy is a huge 15782 (very strong). That’s expert-only territory. The wind is cross-on from the SSE at 19 mph, so it’ll be lumpy. Too big and not clean.
The rest of the first week has some nice windows. Friday, September 11th, morning has a 8ft SSW swell, 14-second period, and a clean cross-offshore wind from the E at 6 mph. Combined energy 2106 (strong). Saturday, September 12th, morning has a 6ft SSW swell, offshore NNE wind at 6 mph, and combined energy 1673 (strong). The afternoon goes glassy with a 5ft swell and WNW wind at 3 mph. Both are clean.
Second week, Wednesday, September 16th, morning is a highlight: 8ft SSW swell, 15-second period, and a clean cross-offshore E wind at 6 mph. Combined energy 4145 (strong). Sunday, September 20th, morning has a 5ft SSE swell, 16-second period, and a clean offshore NE wind at 6 mph. Combined energy 1614 (strong). The afternoon has a 7ft SW swell, 16-second period, and cross-offshore NW wind. Both are clean.
After that, it fades. From Monday, September 21st onward, it’s mostly marginal with cross-shore breezes and smaller, weaker swell.
Bottom line: Tuesday morning, September 8th is the one to circle. Wednesday, September 16th morning is a solid backup. The rest is either too big, too messy, or too small. Advanced crew only. Beginners, wait for the 20th and be cautious.
Rusty.
Short Range ForecastMostly dry. Very mild (max 14°C on Tue morning, min 8°C on Mon night). Winds increasing (calm on Tue morning, fresh winds from the SSE by Tue night). | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Sun morning, min 8°C on Thu night). Winds increasing (calm on Fri night, fresh winds from the NW by Sun morning). | |||||||||||||||||||
Mon 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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 13 | SSW 19 | SSW 17 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SSW 16 | SW 15 |
Wave Graph  | ||||||||||||||||||||
 kJ | 975 | 983 | 2737 | 2521 | 2479 | 11350 | 10137 | 8821 | 5936 | 4318 | 2817 | 2106 | 2836 | 2943 | 1599 | 1024 | 1136 | 818 | 674 | 503 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | glassy | on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross-off | cross-off | cross | off | off | glassy | off | cross-off | cross-off | cross-off |
High Tide | 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 | 1:33PM0.94m | 1:48AM1.06m | ||||||||
Low Tide | 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 | 7:17AM0.34m | 7:11PM0.33m | ||||||||
 |  | |  |  | | | | | | | | | | | | |  | | | |
 | — | — | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:18 | — | — |
 | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:02 | — | — | 6:04 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 11 | 10 | 14 | 12 | 12 | 12 | 11 | 10 | 10 | 11 | 11 | 15 | 16 | 14 | 21 | 20 | 19 | 23 | 23 | 20 |
Feels °C | 7 | 8 | 12 | 8 | 7 | 5 | 5 | 5 | 6 | 8 | 8 | 13 | 14 | 12 | 19 | 18 | 17 | 16 | 17 | 18 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | SSW 12 | SSW 17 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SSW 16 | SW 15 |
| kJ | 975 | 793 | 2737 | 2521 | 2479 | 11350 | 10137 | 8821 | 5936 | 4318 | 2817 | 2106 | 2836 | 2943 | 1599 | 1024 | 1136 | 818 | 674 | 503 |
Swell 2 Height (m) Direction Period (s) | SSW 21 | SSW 19 | WSW 18 | — | — | — | — | — | — | S 26 | — | — | — | — | SSW 19 | SSW 18 | — | — | — | — |
| kJ | 283 | 983 | 1021 | — | — | — | — | — | — | 13 | — | — | — | — | 74 | 299 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | WSW 20 | SSW 14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 163 | 77 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | S 5 | SSW 15 | — | — | — | — | — | — | — | — | — | — | NE 2 | NW 4 | NW 4 | NNW 4 |
| kJ | — | — | — | — | 75 | 4432 | — | — | — | — | — | — | — | — | — | — | 2 | 12 | 34 | 17 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 164 | 0 | 0 | 137 | 167 | 1060 | 1709 | 137 | 164 | 164 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 33 | 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.
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