Surf Forecasts:
Knights surf forecast from 5 Sep 2026:
- Best quality surf: Sunday 6 Sep, 12AM (local time) - 13ft (4.0m), 14s period, SW swell with cross-onshore winds.
- Most powerful swell: Wednesday 9 Sep, 6PM (local time) - 15ft (4.5m), 18s period, SSW swell with 12,269 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 12AM (local time) - 13ft (4.0m), 14s period with SW 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 Sunday (Sep 06) at 12AM. The primary swell is predicted to be 4.0m and 14s period with a secondary swell of 3.0m and 13s. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Knights in the next 16 days are 4.5m 18s and forecast to arrive on Wednesday (Sep 09) 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 0.4m 3s period and expected on Saturday (Sep 12) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 6th Sep) | 13ft (4.0m) 14s |
| Best Surf | 12AM (Sun 6th Sep) | 13ft (4.0m) 14s |
| Most Powerful | 6PM (Wed 9th Sep) | 15ft (4.5m) 18s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, let’s talk about what’s cookin’ at Knights for the next couple of weeks.
Water temp is 58°F, which is pretty normal for this time of year.
The first few days are a write-off. Saturday the 5th has a 10ft SW swell, but with a fresh 22 mph cross-wind, it’s just a lumpy, choppy mess. The energy is massive (6978), but it’s ugly. Sunday the 6th is a bit smaller at 8ft, but the wind is onshore and it’s only marginal. That carries through Monday and Tuesday.
Things start to look interesting on Thursday the 10th, but the swell is predicted to be too big for this spot at 13ft, even with light wind. That’s expert-only territory, and it’s a no-go.
Now, Friday the 11th of September is the real deal. We’ve got an 8ft SSW groundswell with a 14-second period, and the wind is a light 6 mph cross-off from the ENE. That’s clean, powerful, and it’s going to be a ripper on the reef. The energy is still strong (2502), but it’s manageable for the crew with some experience. Not for beginners – 8ft is too big for them.
Saturday the 12th is another standout. The swell drops to 7ft, but the wind goes fully offshore from the N at 6 mph. That’s glassy, clean, and with that 16-second period, the sets will have some serious power. Expect a few people out there – it’s “often” crowded – but it’ll be worth it.
Sunday the 13th is still clean in the morning, with a 3ft long-period swell and a light cross-off wind, but it’s pretty small. Monday the 14th drops off.
Then we hit a gap. The 15th and 16th are blown out with rain and onshore wind. Not worth paddling out.
The next good window is Saturday the 19th of September. The swell is a consistent 5ft to 5ft from the SSW, period is 15 seconds, and the wind is light cross-off or offshore. That’s a solid, clean weekend session. Sunday the 20th is also looking good in the morning, with a 5ft SSW swell and a 9 mph offshore from the NNE, giving clean, lined-up waves. The energy is 2320, so it’s got some grunt.
So, the pick of the forecast is Friday the 11th and Saturday the 12th of September. The 19th and 20th are a solid second option, but the first window has the edge for size and wind. The long-range stuff for the 19th and 20th looks promising, but it’s a bit less certain.
Rusty.
Short Range ForecastMostly dry. Very mild (max 15°C on Sat morning, min 7°C on Mon night). Winds decreasing (fresh winds from the W on Sat morning, calm by Mon night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 12°C on Tue night, min 9°C on Tue morning). Winds decreasing (fresh winds from the SSE on Tue night, calm by Thu night). | ||||||||||||||||||||
Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | |||||||||||||||
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) | SW 15 | SW 11 | SW 14 | SSW 13 | SSW 13 | SW 14 | SSW 13 | SSW 13 | SSW 19 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 4328 | 1897 | 5971 | 2299 | 1726 | 1249 | 700 | 624 | 983 | 2737 | 2551 | 3222 | 2961 | 11289 | 11631 | 8355 | 6063 | 3706 | 2480 | 2136 | 2801 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | on | on | on | on | cross-on | cross | cross | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross | off |
High Tide | 11:00AM1.00m | 5:54AM1.00m | 11:43AM1.19m | 12:08PM1.21m | 00:51AM0.61m | 12:30PM1.19m | 00:40AM0.68m | 12:49PM1.13m | 00:46AM0.77m | 1:06PM1.06m | 1:02AM0.88m | ||||||||||
Low Tide | 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 | 6:11AM0.36m | 7:22PM0.45m | ||||||||||
 | |  |  | | | | |  | | | | | | | | | | | | | |
 | 6:30 | — | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — |
 | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 14 | 13 | 13 | 14 | 13 | 13 | 11 | 10 | 11 | 11 | 12 | 11 | 11 | 10 | 12 | 11 | 11 | 14 | 15 | 15 |
Feels °C | 7 | 6 | 9 | 10 | 11 | 10 | 10 | 7 | 7 | 9 | 7 | 8 | 4 | 5 | 6 | 8 | 7 | 8 | 12 | 13 | 14 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | SSW 13 | SW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 16 |
| kJ | 2650 | 1510 | 5971 | 2299 | 1726 | 1117 | 700 | 624 | 920 | 2737 | 2551 | 3222 | 2961 | 11289 | 11631 | 8355 | 6063 | 3706 | 2480 | 2136 | 2801 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | S 23 | SSW 22 | SSW 21 | SSW 19 | — | — | — | SSW 20 | — | — | — | — | — | SW 24 | — | — |
| kJ | — | — | — | — | — | 11 | 45 | 283 | 983 | — | — | — | 2852 | — | — | — | — | — | 22 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | S 9 | S 7 | WSW 21 | SSW 15 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 1 | 1 | 173 | 142 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 15 | SW 11 | SW 13 | — | — | SW 14 | — | — | — | — | — | — | S 8 | — | — | — | — | — | — | — | — |
| kJ | 4328 | 1897 | 3598 | — | — | 1249 | — | — | — | — | — | — | 667 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1030 | 1020 | 650 | 137 | 137 | 137 | 137 | 166 | 0 | 0 | 137 | 167 | 1060 | 1091 | 137 | 168 | 137 | 0 | 0 | 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.
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