Surf Forecasts:
Knights surf forecast from 12 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: Tuesday 15 Sep, 6PM (local time) - 11ft (3.5m), 14s period, SSW swell with 5,056 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 3.5m 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 0.7m 4s 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 | 6PM (Tue 15th Sep) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, let’s run through the next couple of weeks.
Right now, Sunday morning at Knights has a 1.3m SSW swell but with a NNW cross-off breeze, so it’s clean at least. Energy’s low at 892, so not much to get excited about. By Sunday afternoon it turns cross-on and choppy, and Monday’s even smaller and rougher. Not worth it.
Tuesday the 15th jumps up to 2.1m in the morning and 3.5m in the afternoon, but the wind is onshore and surf quality is poor. The energy hits 7578 in the afternoon, but for paddle surfing it’s a mess.
First decent window comes Wednesday the 16th morning: 3.0m SSW groundswell, cross-shore breeze, 4040 energy. It’s borderline but clean enough. Thursday the 17th morning cleans right up – 2.2m SSW with an ENE cross-off wind at 10 km/h, 1913 energy, clean faces. Water temp is 15°, about average for this time of year. That’s a standout.
Friday the 18th morning is another good one: 1.7m SSW at a long 18 seconds, cross-off NW wind, 1852 energy. Clean, solid, for experienced surfers.
The weekend stalls – Saturday the 19th drops to 1.0m, Sunday the 20th gets blown out by 35 km/h cross-onshore wind. No go.
Monday the 21st morning builds back to 2.5m with cross-off E wind, 2008 energy, clean. But the real gem is Tuesday the 22nd afternoon: glassy conditions, 2.5m SSW groundswell at 16 seconds, 3792 energy. That’s the call of the period.
Wednesday the 23rd morning is also strong: 3.0m, offshore NNE breeze, 4402 energy – another top pick.
The end of the month sees a massive 4.0m SSW swell on Sunday the 27th afternoon, 13362 energy, but it’s too big for Knights and onshore. Kite surfers might love it.
Saturday the 26th afternoon in the second week shows 2.5m SW with a WNW cross-off, 5007 energy – clean, powerful, worth keeping an eye on.
So nail Thursday the 17th and Friday the 18th mornings, and definitely Tuesday the 22nd afternoon for that glassy perfection. Saturday the 26th is a long-range promise but still looks solid.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sun morning. Very mild (max 17°C on Sun morning, min 11°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Fri morning, min 6°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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 14 | SSW 14 | SSW 13 | SSW 17 | SSW 14 | SW 14 | SSW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | SSW 18 | SSW 16 | SSW 15 | SSW 14 | SSW 13 | SW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 892 | 768 | 515 | 323 | 277 | 195 | 1538 | 4591 | 3680 | 4040 | 4046 | 3432 | 1913 | 1313 | 968 | 1852 | 1445 | 857 | 384 | 222 | 120 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | 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 | 1:33PM0.94m | 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 | 4:20AM1.03m | |||||||||
Low Tide | 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 | 8:56AM0.84m | 8:13PM0.32m | ||||||||
 |  |  | |  |  | | | | | | | | | | | | | | | | |
 | 6:18 | — | — | 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 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 12 | 15 | 15 | 16 | 13 | 12 | 11 | 11 | 11 | 10 | 12 | 13 | 12 | 18 | 18 | 17 | 21 | 22 | 24 |
Feels °C | 13 | 13 | 11 | 12 | 12 | 13 | 7 | 5 | 5 | 7 | 6 | 6 | 9 | 10 | 9 | 14 | 15 | 14 | 14 | 17 | 17 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 14 | SSW 14 | SSW 13 | SW 12 | SSW 14 | SW 14 | SSW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | SSW 18 | SSW 16 | SSW 15 | SSW 14 | SSW 13 | SW 12 |
| kJ | 892 | 768 | 515 | 323 | 277 | 175 | 1538 | 4591 | 3680 | 4040 | 4046 | 3432 | 1913 | 1313 | 968 | 1852 | 1445 | 857 | 384 | 222 | 120 |
Swell 2 Height (m) Direction Period (s) | — | — | S 21 | SSW 19 | SW 5 | SSW 17 | SSW 16 | — | — | — | — | — | — | — | SSW 21 | — | — | — | SW 20 | SW 18 | SSW 17 |
| kJ | — | — | 9 | 37 | 28 | 195 | 100 | — | — | — | — | — | — | — | 173 | — | — | — | 15 | 83 | 113 |
Swell 3 Height (m) Direction Period (s) | — | — | — | SSW 20 | SW 18 | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 20 | SSW 19 | — |
| kJ | — | — | — | 37 | 82 | — | — | — | — | — | — | — | — | — | — | — | — | — | 15 | 35 | — |
Wind waves Height (m) Direction Period (s) | NNW 4 | W 4 | SW 5 | SW 5 | — | SW 7 | SSW 6 | SSW 14 | — | — | — | — | — | — | — | N 3 | — | — | NNW 3 | NW 4 | WNW 4 |
| kJ | 9 | 14 | 32 | 32 | — | 73 | 127 | 2987 | — | — | — | — | — | — | — | 2 | — | — | 7 | 12 | 11 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 247 | 2 | 404 | 33 | 167 | 137 | 167 | 137 | 168 | 166 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 1 | 523 |
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