Surf Forecasts:
Knights surf forecast from 18 Aug 2026:
- Best quality surf: Thursday 20 Aug, 6AM (local time) - 4.5ft (1.4m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 22 Aug, 3AM (local time) - 8ft (2.5m), 16s period, SSW swell with 2,948 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 9PM (local time) - 4ft (1.2m), 16s 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 (Aug 18) at 9PM. The primary swell is predicted to be 1.2m and 16s period with a secondary swell of 0.1m and 7s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Knights in the next 16 days are 2.5m 16s and forecast to arrive on Saturday (Aug 22) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Wednesday (Aug 19) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Tue 18th Aug) | 4ft (1.2m) 16s |
| Best Surf | 6AM (Thu 20th Aug) | 4.5ft (1.4m) 14s |
| Most Powerful | 3AM (Sat 22nd Aug) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Right, let’s have a look at what’s coming up for Knights. The forecast is a bit of a mixed bag, with some real gems buried in there, but you’ll need to be patient and pick your moments.
The next few days are a write-off, to be honest. Tuesday afternoon has some rain and a light cross-off breeze, but the swell is only 3ft from the SSW with a decent 17-second period. The combined energy is moderate at 753, so there’s some push, but the wind state is clean and the score is low. It’s not bad, but it’s not *good* either. Wednesday and Thursday are a mess with strong, gusty winds and poor surf conditions. Friday and Saturday see the swell building, but it’s onshore and choppy, making it a tough paddle for little reward.
Sunday the 23rd morning is where things start to get interesting. That’s the first real standout. The wind goes glassy offshore from the north at just 3 mph, and we’ve got a clean 7ft SSW groundswell with a 14-second period. The combined energy is strong at 2297, so there’s plenty of power. This is excellent for experienced surfers, but at 7ft, it’s too big for beginners. The water temperature is about 58°, which is normal for this time of year. It’s a point-and-reef setup, so that long-period swell will really line up nicely. Crowds are likely here, so get in early.
The following week is a bit of a rollercoaster. There’s a big pulse of swell from the 27th of August right through the 28th, with heights hitting 13ft, but the wind is howling onshore, making it a total mess. That’s a kite-surfing day, not a paddle-surfing day. The 29th of August Saturday morning is a nice reset: clean, cross-off wind from the east at 6 mph, with 8ft SSW swell at 12 seconds. That’s solid, but still for the experienced crew.
The real standout of the whole outlook, though, is Monday the 31st of August morning. The wind is glassy, dead calm from the ENE, and the swell is a solid 7ft from the SSW with a very long 18-second period. The combined energy is 3382, which is strong. That’s a proper groundswell, and at a reef or point break like Knights, it’s going to be epic. The waves will be lined up, with plenty of paddle gaps between sets. This is the best on offer, pure and simple. After that, Tuesday the 1st of September and Wednesday the 2nd of September mornings also look excellent with clean conditions and solid swell, but the 31st is the one to circle.
So, to sum it up: the first week is mostly poor, with a clean window on Sunday the 23rd morning for experienced surfers. Then the end of the month and start of September have a run of clean, powerful swells, with Monday the 31st of August morning being the absolute pick of the bunch. Keep an eye on it, because the forecasts are more reliable closer in.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Tue night. Very mild (max 19°C on Tue afternoon, min 11°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 17°C on Mon morning, min 11°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 17 | SSW 16 | SSW 16 | SSW 15 | SW 14 | SW 13 | SW 13 | SW 16 | SW 14 | SW 14 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 13 |
Wave Graph | ||||||||||||||||||||
573 | 519 | 314 | 279 | 272 | 473 | 466 | 1333 | 1079 | 911 | 2663 | 2791 | 2042 | 1724 | 1538 | 2102 | 1241 | 774 | 752 | 772 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross | cross-off | cross-off | cross | cross | cross-on | cross-on | cross | cross-on | on | cross-off | off | cross | cross-off | cross | cross-on | on |
High Tide | 3:42AM1.07m | 2:47PM0.96m | 4:20AM1.07m | 2:36PM0.94m | 5:04AM1.04m | 6:12AM0.99m | 11:23AM1.13m | 11:44AM1.18m | 00:40AM0.59m | |||||||||||
Low Tide | 8:41PM0.37m | 9:04AM0.70m | 8:53PM0.38m | 9:14AM0.83m | 9:03PM0.40m | 8:38AM0.94m | 9:06PM0.42m | 7:35AM0.99m | 9:02PM0.45m | 8:54PM0.45m | 8:42PM0.45m | |||||||||
— | — | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:46 | — | — | |
5:44 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — | |
mm | 1 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 14 | 15 | 15 | 13 | 15 | 15 | 13 | 14 | 14 | 13 | 14 | 14 | 12 | 16 | 15 | 13 | 17 | 17 | 12 |
Feels °C | 16 | 12 | 10 | 10 | 10 | 10 | 10 | 11 | 10 | 11 | 11 | 12 | 12 | 11 | 14 | 12 | 11 | 14 | 14 | 11 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SW 14 | SW 13 | SW 13 | SW 16 | SW 14 | SW 14 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 13 |
573 | 519 | 314 | 279 | 272 | 473 | 466 | 1333 | 1079 | 911 | 2663 | 2791 | 2042 | 1724 | 1538 | 2102 | 1241 | 774 | 752 | 772 | |
Swell 2 Height (m) Direction Period (s) | SW 13 | S 7 | — | SW 10 | SW 10 | SSW 16 | SSW 16 | WSW 10 | SSW 18 | SSW 18 | — | SSW 24 | SSW 21 | SSW 19 | SSW 18 | — | — | SSW 21 | SW 20 | SW 18 |
180 | 1 | — | 45 | 79 | 322 | 318 | 349 | 534 | 817 | — | 54 | 302 | 584 | 759 | — | — | 44 | 97 | 154 | |
Swell 3 Height (m) Direction Period (s) | NE 4 | — | — | SSW 20 | SW 18 | — | — | WSW 16 | SW 18 | SSW 18 | — | — | SW 21 | — | — | — | — | — | SW 20 | WSW 18 |
5 | — | — | 40 | 162 | — | — | 683 | 703 | 497 | — | — | 117 | — | — | — | — | — | 97 | 124 | |
Wind waves Height (m) Direction Period (s) | NNE 4 | NNE 3 | NW 4 | WNW 4 | WSW 7 | NW 3 | NW 4 | — | — | — | — | — | — | — | — | — | — | NW 3 | WNW 4 | WSW 4 |
7 | 6 | 28 | 24 | 108 | 2 | 20 | — | — | — | — | — | — | — | — | — | — | 6 | 11 | 10 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 342 | 404 | 0 | 2 | 5 | 1 | 2 | 5 | 1 | 2 | 33 | 0 | 0 | 1 | 0 | 1 | 2 | 137 |
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.











