Surf Forecasts:
Knights surf forecast from 13 Sep 2026:
- Best quality surf: Thursday 17 Sep, 3AM (local time) - 8ft (2.5m), 15s period, SSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 3PM (local time) - 10ft (3.0m), 15s period, SSW swell with 3,993 kJ wave energy.
- Next surfable swell (1★+): Thursday 17 Sep, 3AM (local time) - 8ft (2.5m), 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 Thursday (Sep 17) at 3AM. The primary swell is predicted to be 2.5m and 15s period. 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 3.0m 15s and forecast to arrive on Wednesday (Sep 16) 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 1.2m 5s period and expected on Saturday (Sep 19) at 3PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 17th Sep) | 8ft (2.5m) 15s |
| Best Surf | 3AM (Thu 17th Sep) | 8ft (2.5m) 15s |
| Most Powerful | 3PM (Wed 16th Sep) | 10ft (3.0m) 15s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s brewing at Knights for the next couple weeks.
First few days are a washout. Monday the 14th and Tuesday the 15th? Forget it. Swell runs from 3 ft to 10 ft out of the SSW, but the wind is onshore and howling at 15 to 16 mph. Choppy and ugly.
Wednesday the 16th sees the swell still big at 10 ft with a 15-second period, but the wind shifts east-southeast. Still a bit lumpy, but the energy is there—moderate. Not clean yet.
Thursday the 17th morning is your first real highlight. You’ve got 7 ft of SSW groundswell, a 14-second period, and a light east-northeast offshore breeze at 6 mph. Clean. Energy is solid (1969). For the advanced crew, that’s a go. Expect a crowd.
Friday the 18th stays clean with a northwesterly offshore breeze, but the swell backs off to 6 ft. The period is very long at 18 seconds—powerful, but at a beach and reef setup like Knights, it might be a bit straight. Still a good shape.
Saturday the 19th drops to 3 ft, and Sunday the 20th gets messy with a short-period 8 ft windswell and strong cross-winds. Not your day.
Look ahead to Monday the 21st afternoon. 10 ft of SSW swell, a 17-second period, and a light east-southeast breeze. Energy jumps to 5603—strong. A bit cross-shore, but that’s a serious session for the experienced.
Tuesday the 22nd afternoon is another winner: 8 ft of SSW, 16-second period, northwesterly offshore at 9 mph, clean, energy at 3412. Excellent.
Mid-second week goes south again. Wednesday the 23rd and Thursday the 24th are blown out with onshore winds and rain. Friday the 25th is only marginal.
Now the long-range bomb: Sunday the 27th. Morning is massive—12 ft of 19-second period swell, energy at 10108, clean with a light offshore. Experts only. But the afternoon is the real prize: 10 ft, 16-second period, glassy conditions with a light southwesterly. Energy of 6040. Exceptional. That’s the one to mark.
Monday the 28th still has clean 8 ft waves, but Tuesday the 29th turns onshore again.
Best bets: Thursday the 17th morning, Monday the 21st afternoon, Tuesday the 22nd afternoon, and the standout—Sunday the 27th afternoon.
– Rusty
Short Range ForecastMostly dry. Very mild (max 16°C on Mon morning, min 10°C on Wed morning). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 22°C on Sat morning, min 6°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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 14 | SSW 13 | SW 12 | SSW 13 | SSW 14 | SSW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 18 | SSW 16 | SSW 15 | SSW 13 | SSW 13 | SW 12 |
Wave Graph  | |||||||||||||||||||
 kJ | 515 | 323 | 277 | 570 | 1999 | 3601 | 3826 | 3986 | 3993 | 3526 | 1969 | 1465 | 1137 | 1852 | 1245 | 610 | 282 | 222 | 1042 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | on | on | on | cross-on | cross | cross-on | cross | cross-off | cross | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 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 | 4:20AM1.03m | ||||||||
Low Tide | 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 | 8:56AM0.84m | 8:13PM0.32m | |||||||
 |  |  |  | | | | | | | | | | | | | | | | |
 | — | 6:16 | — | — | 6:16 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:09 | — | — |
 | 6:04 | — | 6:04 | — | — | 6:05 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 16 | 16 | 16 | 13 | 13 | 11 | 10 | 10 | 10 | 12 | 14 | 13 | 18 | 19 | 19 | 22 | 22 | 23 |
Feels °C | 12 | 13 | 13 | 13 | 7 | 6 | 6 | 5 | 5 | 6 | 9 | 11 | 10 | 13 | 15 | 15 | 16 | 17 | 18 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 13 | SSW 17 | SSW 16 | SSW 14 | SSW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 18 | SSW 16 | SSW 15 | SSW 13 | SSW 13 | SSW 17 |
| kJ | 515 | 323 | 277 | 195 | 733 | 3601 | 3826 | 3986 | 3993 | 3526 | 1969 | 1465 | 1137 | 1852 | 1245 | 610 | 282 | 222 | 119 |
Swell 2 Height (m) Direction Period (s) | S 21 | SSW 19 | SW 18 | SW 17 | SW 16 | — | — | — | — | — | — | — | — | — | — | — | SW 20 | SW 19 | WSW 18 |
| kJ | 9 | 37 | 82 | 334 | 125 | — | — | — | — | — | — | — | — | — | — | — | 15 | 58 | 63 |
Swell 3 Height (m) Direction Period (s) | — | SSW 20 | WSW 18 | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 20 | SSW 19 | — |
| kJ | — | 37 | 63 | — | — | — | — | — | — | — | — | — | — | — | — | — | 15 | 37 | — |
Wind waves Height (m) Direction Period (s) | SW 5 | WSW 5 | SW 5 | SW 12 | SSW 13 | — | — | — | — | — | — | — | — | N 3 | NW 4 | N 3 | NNW 4 | NW 5 | SW 12 |
| kJ | 28 | 28 | 34 | 570 | 1999 | — | — | — | — | — | — | — | — | 5 | 7 | 2 | 16 | 60 | 1042 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1 | 404 | 2 | 137 | 137 | 167 | 137 | 168 | 164 | 0 | 0 | 0 | 0 | 2 | 2 | 0 | 2 | 1 | 1 |
Best forecast wave conditions in South Australia - East Coast | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Knights surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest