
Surf Forecasts:
Knights surf forecast from 4 Sep 2026:
- Best quality surf: Thursday 10 Sep, 12AM (local time) - 15ft (4.5m), 18s period, SSW swell with cross-shore winds.
- Most powerful swell: Wednesday 9 Sep, 3PM (local time) - 15ft (4.5m), 19s period, SSW swell with 13,276 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 1.5m and 13s. 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 4.5m 19s 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 1.0m 4s period and expected on Saturday (Sep 05) at 3AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Tue 8th Sep) | 4.5ft (1.4m) 18s |
| Best Surf | 12AM (Thu 10th Sep) | 15ft (4.5m) 18s |
| Most Powerful | 3PM (Wed 9th Sep) | 15ft (4.5m) 19s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, you know what, right now it’s a bit of a waiting game. We’ve got a big groundswell bearing down on Knights, and for the first few days, things are just going to be way too large to get out there at this exposed beach and reef. The water’s at 58°F, which is pretty much average for the time of year.
Friday morning, the 4th of September, kicks off with a solid 12ft SSW groundswell. The period is a very long 16 seconds, and there’s a massive 5368 (moderate-strong) units of energy pumping through. The wind is offshore and light from the north, so it looks glassy. But hang on – this is for advanced surfers only. The problem is the sheer size – it’s just too big for this break. The jury’s out on that one.
Saturday the 5th is a total write-off, I wouldn’t even bother looking. Sunday the 6th is onshore with a messy 8ft swell – not worth a paddle.
Alright, the first real standout comes on Tuesday morning, the 8th of September. The swell has dropped to a still hefty 7ft from the SSW, but the period has stretched out even further to a monstrous 17 seconds. The energy is still strong at 3758 (moderate-strong). The wind is a light, clean offshore from the ENE, which is perfect. It’s going to be clean and powerful. This is the call for the experienced crew; the long period groundswell will draw some nice lines through that reef section. It’s an advanced-only prospect though.
Things settle down nicely toward the end of the week. Saturday the 12th of September is a beauty. We’ve got a 6ft SSW swell with a 15-second period. The energy is moderate at 1272. But the best part? The afternoon turns dead flat calm – glassy conditions. That is the best the break is going to look all week.
After that, the swell drops away, with small waves down to 3ft on Sunday the 13th. The 16th and 17th of September see the big power return, but with a lot of wind and size that’s back over 12ft, making it messy and tricky. For the kite crew, that Wednesday morning the 16th looks more interesting for a session than a paddle.
Late on the 19th of September, another strong 12ft SSW swell shows up, but under a moderate offshore from the NE, which could clean it up for the experts if the size doesn’t keep them off.
So, to wrap it up: if you’re an advanced surfer with a big-wave board, the cleanest and most rideable of these big swells will be Tuesday morning the 8th. For everyone else, the glassy Saturday afternoon the 12th is your moment. The waiting game pays off.
Rusty
Short Range ForecastMostly dry. Warm (max 21°C on Fri night, min 11°C on Sun night). Winds decreasing (fresh winds from the W on Sat morning, light winds from the SW by Sun night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 14°C on Tue morning, min 7°C on Wed night). Winds increasing (light winds from the NE on Mon night, fresh winds from the SSE by Wed morning). | ||||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | |||||||||||||||
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 16 | SSW 15 | SW 15 | SW 11 | SW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 19 | SSW 17 | SSW 17 | SSW 16 | SSW 21 | SSW 19 | SSW 18 | SSW 17 | SSW 16 | SSW 15 |
Wave Graph | |||||||||||||||||||||
5368 | 4414 | 3049 | 4529 | 1923 | 5716 | 2334 | 1726 | 1100 | 787 | 615 | 983 | 2737 | 2582 | 2682 | 11580 | 13276 | 12597 | 9403 | 6267 | 3867 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | cross | cross | cross-on | on | on | on | cross-on | cross-on | cross | cross-off | cross-on | on | cross-on | cross-on | cross | cross | cross-on | cross |
High Tide | 12:35PM0.87m | 4:47AM1.08m | 5:54AM1.00m | 11:43AM1.19m | 12:08PM1.21m | 00:51AM0.61m | 12:30PM1.19m | 00:40AM0.68m | 12:49PM1.13m | 00:46AM0.77m | |||||||||||
Low Tide | 8:14PM0.31m | 8:22AM0.97m | 8:22PM0.31m | 7:17AM0.99m | 8:30PM0.33m | 8:36PM0.36m | 8:36PM0.41m | 4:25AM0.53m | 8:21PM0.46m | 5:29AM0.43m | 7:50PM0.48m | ||||||||||
6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | |
— | 5:57 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 20 | 21 | 14 | 14 | 13 | 14 | 14 | 12 | 13 | 13 | 11 | 14 | 13 | 12 | 11 | 11 | 11 | 9 | 10 | 10 |
Feels °C | 15 | 16 | 16 | 6 | 6 | 8 | 11 | 11 | 10 | 10 | 10 | 9 | 12 | 11 | 8 | 4 | 4 | 5 | 5 | 6 | 7 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 17 | SSW 17 | SSW 16 | SSW 21 | SSW 19 | SSW 18 | SSW 17 | SSW 16 | SSW 15 |
5368 | 4414 | 3049 | 1882 | 1155 | 5716 | 2334 | 1726 | 1100 | 787 | 615 | 699 | 2737 | 2582 | 2682 | 11580 | 13276 | 12597 | 9403 | 6267 | 3867 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | S 23 | SSW 22 | SSW 21 | SSW 19 | WSW 18 | — | SSW 26 | — | — | — | — | — | S 26 |
— | — | — | — | — | — | — | — | 11 | 45 | 286 | 983 | 1021 | — | 131 | — | — | — | — | — | 13 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | WSW 21 | WSW 21 | SSW 15 | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | 45 | 173 | 42 | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | NNE 4 | NE 4 | NW 4 | SW 15 | SW 11 | SW 13 | — | — | — | — | — | — | — | — | — | S 6 | — | — | — | — | — |
13 | 12 | 20 | 4529 | 1923 | 3447 | — | — | — | — | — | — | — | — | — | 125 | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 1 | 502 | 907 | 1020 | 651 | 137 | 137 | 137 | 137 | 137 | 0 | 0 | 100 | 137 | 1020 | 1280 | 168 | 164 | 164 | 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.










