
Surf Forecasts:
Knights surf forecast from 18 Jul 2026:
- Best quality surf: Tuesday 21 Jul, 3AM (local time) - 5ft (1.6m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 23 Jul, 6AM (local time) - 10ft (3.0m), 14s period, SSW swell with 3,993 kJ wave energy.
- Next surfable swell (1★+): Saturday 18 Jul, 9PM (local time) - 3.5ft (1.0m), 13s 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 (Jul 18) at 9PM. The primary swell is predicted to be 1.0m and 13s period with a secondary swell of 0.1m and 22s. 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 14s and forecast to arrive on Thursday (Jul 23) at 6AM. Winds are predicted to be 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 Monday (Jul 20) at 3AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 18th Jul) | 3.5ft (1.0m) 13s |
| Best Surf | 3AM (Tue 21st Jul) | 5ft (1.6m) 14s |
| Most Powerful | 6AM (Thu 23rd Jul) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, Rusty here, checking in. Let’s have a look at the next few weeks at Knights.
We’re starting off with a bit of a slow one, but don’t let that fool you. The first real action kicks off Saturday afternoon, July 18th, with a clean, glassy 4ft SW swell rolling in. The water’s sitting at 58°, right around where it should be for this time of year – nothing unusual there. The waves are clean, but for an advanced spot like this, it’s just a gentle warm-up. The real fun starts to build from Sunday morning, July 19th, with a light cross-offshore breeze and a 3ft SSW groundswell that has a long 12-second period, making for some smooth, lined-up waves. That sets the stage for a solid run.
Monday, July 20th, is where things start to get exciting. A 4ft SW groundswell with a 16-second period (very long) sends in moderate wave energy (607) and the light cross-off wind keeps it glassy. This is a standout. The long period is a classic reef/point setup, and with the wind behaving, Knights will be offering some proper, clean walls. The consistency is good, so you won’t be waiting around forever between sets.
The build continues into Tuesday, July 21st. The swell bumps up to 5ft from the SW, still with a decent 13-second period, and energy is cranking (854). The wind is light and cross-off, so the quality is high. This is another top pick. The waves are getting a bit more size, but still manageable for the advanced crew.
We hit a rough patch Wednesday, July 22nd. The swell jumps to 6ft, but the wind swings cross-onshore, creating a choppy, messy mess. Thursday, July 23rd, is a write-off too – 10ft of SSW swell with onshore wind, just a wall of white water for the experts only, and even then, it’s marginal.
The next true standout is a week away, on Saturday, July 25th. We get a clean, offshore wind from the N, and a 7ft SSW groundswell with a 13-second period. The energy is strong (1643), and the conditions are described as excellent for experienced surfers. This is the best on offer in the whole window. The swell is big – over 8ft it’s for experts only, so this is at the top end of that. It will be a big, powerful, clean day. Crowds are likely at a spot like this, but for a day like that, it’s worth it.
After that, the following week is a mixed bag. Sunday, July 26th, sees the swell drop to 5ft with a good cross-off, but the wind picks up Monday and Tuesday, July 27th and 28th, turning it into a washing machine. Wednesday, July 29th, is still cross-choppy, but Thursday, July 30th, brings another cracker. A 7ft SSW swell with a 12-second period, a clean offshore from the NE, and light wind. Excellent conditions for experienced surfers. The energy is still strong (1289). This is a solid, late-window option.
The final days of the forecast, right into August 1st and 2nd, get messy again. The swell gets huge – 12ft and 15ft on Sunday, August 2nd – but the wind is onshore or cross-onshore, making it a blown-out, dangerous beast. That’s not a surfer’s day, that’s a kite day.
So, to wrap it up: The clear standouts are Saturday, July 25th (7ft, offshore, excellent conditions) and Thursday, July 30th (7ft, offshore, excellent conditions). The first week has some nice, smaller windows on Monday, July 20th and Tuesday, July 21st, but the real power and quality is in those two late July days. The second week turns into a big, windy mess, so get out there while the getting’s good.
Rusty.
Short Range ForecastMostly dry. Very mild (max 16°C on Sat afternoon, min 13°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Wed morning. Very mild (max 15°C on Tue afternoon, min 9°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Sat 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 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) | SW 13 | SSW 13 | SSW 12 | SSW 18 | SSW 16 | SW 16 | SW 15 | SSW 14 | SW 13 | SW 13 | SW 12 | SW 13 | SSW 11 | SSW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 14 | SSW 14 | SSW 14 |
Wave Graph | ||||||||||||||||||||
400 | 346 | 218 | 214 | 339 | 573 | 489 | 961 | 854 | 689 | 428 | 1120 | 1425 | 3761 | 3662 | 2930 | 3291 | 2374 | 1875 | 2035 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | on | on | on | cross-on | cross | on | cross-off |
High Tide | 2:44AM0.81m | 3:06PM1.12m | 3:24AM0.88m | 3:20PM1.06m | 4:08AM0.94m | 3:29PM1.02m | 4:58AM0.98m | 3:26PM0.99m | 6:05AM1.00m | 11:08AM1.14m | ||||||||||
Low Tide | 9:47PM0.57m | 7:49AM0.47m | 9:45PM0.54m | 8:25AM0.58m | 9:53PM0.52m | 8:53AM0.72m | 10:07PM0.51m | 8:57AM0.86m | 10:26PM0.51m | 8:04AM0.99m | 10:45PM0.53m | 10:29PM0.55m | ||||||||
— | — | 7:20 | — | — | 7:20 | — | — | 7:18 | — | — | 7:18 | — | — | 7:18 | — | — | 7:16 | — | — | |
5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:23 | — | — | 5:23 | — | — | 5:24 | — | — | 5:25 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — |
Temp °C | 16 | 14 | 15 | 15 | 15 | 16 | 15 | 15 | 16 | 15 | 14 | 13 | 13 | 11 | 12 | 11 | 10 | 11 | 11 | 11 |
Feels °C | 15 | 12 | 11 | 12 | 12 | 13 | 12 | 13 | 13 | 12 | 11 | 9 | 7 | 5 | 7 | 6 | 6 | 8 | 8 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SSW 13 | SSW 12 | SSW 11 | SSW 16 | SW 16 | SW 15 | SSW 14 | SW 13 | SW 13 | SW 12 | — | — | SSW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 14 | SSW 14 | SSW 14 |
400 | 346 | 218 | 95 | 339 | 573 | 489 | 961 | 854 | 689 | 428 | — | — | 3761 | 3662 | 2930 | 3291 | 2374 | 1875 | 2035 | |
Swell 2 Height (m) Direction Period (s) | — | SW 22 | SW 20 | SW 12 | S 10 | SSW 10 | S 10 | S 9 | — | — | — | — | — | — | — | — | — | — | — | — |
— | 18 | 97 | 92 | 54 | 34 | 17 | 7 | — | — | — | — | — | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | SW 22 | — | SSW 18 | SW 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | 18 | — | 214 | 73 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | NE 3 | NNE 2 | N 3 | NNW 3 | — | NNW 3 | NW 4 | — | — | WNW 3 | WNW 3 | SW 13 | SSW 11 | — | — | — | — | — | — | — |
2 | 1 | 1 | 2 | — | 4 | 3 | — | — | 3 | 5 | 1120 | 1425 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 577 | 591 | 167 | 137 | 137 | 2 | 1 | 33 | 0 |
Best forecast wave conditions in South Australia - East Coast | ||||||||||||||||||||
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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.










