Surf Forecasts:
Knights surf forecast from 14 Aug 2026:
- Best quality surf: Saturday 15 Aug, 12AM (local time) - 10ft (3.0m), 16s period, SSW swell with glassy winds.
- Most powerful swell: Friday 14 Aug, 9PM (local time) - 10ft (3.0m), 16s period, SSW swell with 4,451 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 12AM (local time) - 10ft (3.0m), 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 Saturday (Aug 15) at 12AM. The primary swell is predicted to be 3.0m and 16s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Knights in the next 16 days are 3.0m 16s and forecast to arrive on Friday (Aug 14) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 4s period and expected on Tuesday (Aug 18) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sat 15th Aug) | 10ft (3.0m) 16s |
| Best Surf | 12AM (Sat 15th Aug) | 10ft (3.0m) 16s |
| Most Powerful | 9PM (Fri 14th Aug) | 10ft (3.0m) 16s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m gonna take you through the next couple of weeks at Knights. This is a spot that’s got a reef and beach setup, and it’s built for folks who know what they’re doing – it’s an advanced wave.
The Overall Pattern
We’ve got a slow start, but the second half of the window is where this thing wakes up. The water is sitting at 57° right now, which is pretty much what you’d expect for this time of year, nothing weird going on there.
The First Week
The first few days are a bit of a write-off. Friday the 14th through Sunday the 16th have some size, with waves around 8 ft to 10 ft coming from the SSW, but the wind is all over the shop – cross-on, cross, choppy. It’s a messy, marginal vibe. The energy is there, but it’s not clean.
Monday the 17th is where we start to see a change. The morning has a clean 4 ft wave from the SSW with a long 16-second period, and the wind is cross-offshore. It’s a much better look, the combined swell energy is moderate (1139). The afternoon picks up a bit to 6 ft, still with that clean cross-off wind. It’s not huge, but it's surfable.
Tuesday the 18th is a real standout for the early part. We’re looking at clean, offshore winds from the NE all day. The swell drops to 3 ft, but with a 17-second period, it’s a proper groundswell. The energy is moderate (883 in the morning, 760 in the afternoon). This is a classic, clean, long-period swell that will be a joy at this reef. It’s a good day for a paddle.
Wednesday the 19th is clean again in the morning with a 3 ft wave, but it gets small and a bit cross-on in the afternoon. Thursday the 20th is a write-off with choppy, cross-on wind. Friday the 21st picks up in size (6 ft) but the wind is onshore and ugly.
The Second Week – The Real Action
Saturday the 22nd has a big jump in size – 10 ft from the SSW, but the wind is onshore and messy. It’s a lot of energy (6976) but not for paddling. If you’re into kiting, it might be your day.
Now, Sunday the 23rd is the bell ringer. The morning has a clean 7 ft wave from the SW with a 14-second period and cross-off winds from the ENE. The energy is strong (3036). But the afternoon is the real gem: a 8 ft wave from the SW, a very long 17-second period, and a light cross-shore wind. The energy is massive (6987). This is a top-tier, long-period groundswell for experienced surfers. This is the session to aim for.
Monday the 24th is a beast. We’re talking 13 ft in the morning and 12 ft in the afternoon from the SSW, with clean wind and a 17-second period. The energy is enormous (8411). But the data says it’s too big for this break. This is only for absolute experts, and even then, it’s a heavy, heavy day.
Tuesday the 25th settles back down. The morning has a clean 6 ft wave with offshore winds and a 14-second period. It’s a solid, clean wave for the experienced crew. The energy is moderate (1206).
The rest of the window from Wednesday the 26th onward is a mixed bag of onshore winds, smaller waves, and choppy conditions. The 29th shows a glimmer of hope with a clean 4 ft wave in the morning, but it’s not the standout.
The Bottom Line
If you have to pick one day, it’s Sunday the 23rd of August. The afternoon session in particular is a beauty – a big, clean, long-period swell from the SSW with light wind. It’s an advanced wave, and it’s going to be a ripper. The Tuesday the 18th was a nice clean day for the early birds, but the 23rd is the true standout.
Rusty.
Short Range ForecastMostly dry. Very mild (max 15°C on Fri afternoon, min 11°C on Sun afternoon). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Mon night. Very mild (max 16°C on Mon afternoon, min 11°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||
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 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 16 | SSW 16 | SSW 15 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SW 15 | SW 14 | SW 15 | SSW 16 | SW 16 |
Wave Graph | ||||||||||||||||||||
4136 | 4396 | 3348 | 2741 | 1956 | 1556 | 1396 | 994 | 651 | 1531 | 911 | 629 | 580 | 519 | 306 | 314 | 280 | 523 | 436 | 1909 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | cross | cross-on | cross | cross | cross-on | glassy | cross-off | cross-off | off | off | off | off | cross-off | cross-on | cross-off | cross-on | cross-on | cross-on |
High Tide | 1:38AM0.81m | 2:06PM1.12m | 2:04AM0.90m | 2:20PM1.06m | 2:35AM0.98m | 2:33PM1.01m | 3:07AM1.04m | 2:43PM0.98m | 3:42AM1.07m | 2:47PM0.96m | 4:20AM1.07m | 2:36PM0.94m | ||||||||
Low Tide | 8:38PM0.51m | 7:03AM0.35m | 8:25PM0.47m | 7:39AM0.39m | 8:23PM0.43m | 8:11AM0.47m | 8:30PM0.39m | 8:40AM0.58m | 8:41PM0.37m | 9:04AM0.70m | 8:53PM0.38m | 9:14AM0.83m | 9:03PM0.40m | |||||||
— | — | 6:56 | — | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:50 | — | — | |
5:40 | — | — | 5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | |
mm | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | — | — | — | — | — | — | — |
Temp °C | 15 | 13 | 13 | 13 | 13 | 12 | 11 | 12 | 14 | 16 | 13 | 13 | 16 | 16 | 16 | 14 | 12 | 15 | 14 | 11 |
Feels °C | 13 | 11 | 11 | 9 | 10 | 7 | 7 | 11 | 10 | 12 | 8 | 9 | 12 | 11 | 14 | 13 | 11 | 11 | 10 | 8 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 12 | SSW 16 | SSW 15 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SW 15 | SW 14 | SW 15 | SSW 16 | SW 16 |
4136 | 4396 | 3348 | 2741 | 1956 | 1556 | 1396 | 994 | 433 | 1531 | 911 | 629 | 580 | 519 | 306 | 314 | 280 | 523 | 436 | 1494 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | S 26 | SSW 16 | SSW 22 | SSW 19 | SW 13 | SW 13 | — | WSW 15 | SW 20 | SSW 19 | SSW 18 | SW 13 | — |
— | — | — | — | — | — | — | 13 | 651 | 185 | 480 | 253 | 180 | — | 201 | 65 | 233 | 209 | 241 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SSW 24 | — | — | S 6 | — | — | — | NE 3 | — | — | — | — |
— | — | — | — | — | — | — | — | 55 | — | — | 1 | — | — | — | 3 | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | E 3 | — | NE 4 | NE 4 | NE 4 | NE 4 | NNE 3 | NNE 3 | NE 3 | NNW 3 | NW 3 | SW 16 |
— | — | — | — | — | — | — | — | 7 | — | 24 | 39 | 23 | 15 | 5 | 2 | 2 | 3 | 4 | 1909 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 100 | 0 | 4 | 168 | 0 | 164 | 164 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 22 | 0 | 2 | 404 | 2 |
Best forecast wave conditions in South Australia - East Coast | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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.











