Knights Surf Break

Lat Long: 35.54° S 138.68° E

Knights Surf Forecast and Surf Report

Issued: 8 am 17 Aug 2026 (local time)

Forecast update in  hr  min

Today's Knights sea temperature is
14.2° C
0.1° 

Knights surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Knights surf forecast from 17 Aug 2026:

  • Best quality surf: Friday 21 Aug, 6AM (local time) - 6ft (1.9m), 15s period, SW swell with glassy winds.
  • Most powerful swell: Saturday 22 Aug, 9PM (local time) - 8ft (2.5m), 15s period, SSW swell with 3,009 kJ wave energy.
  • Next surfable swell (1★+): Monday 17 Aug, 9PM (local time) - 5.5ft (1.7m), 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 Monday (Aug 17) at 9PM. The primary swell is predicted to be 1.7m and 15s period. 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 15s and forecast to arrive on Saturday (Aug 22) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Tuesday (Aug 18) at 6AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Mon 17th Aug)5.5ft (1.7m) 15s
Best Surf 6AM (Fri 21st Aug)6ft (1.9m) 15s
Most Powerful 9PM (Sat 22nd Aug)8ft (2.5m) 15s

Table - best surf conditions forecast for Knights over the next 16 days.


The Lowdown

G’day, Rusty here. Let’s look at what’s coming for Knights (beach and reef). There’s a bit of a dry spell to start, but the back half of the 16-day window fires up. Water temp is about 58°F, right on average for this time of year.

Now through Thursday August 17th: Nothing worth paddling out for Monday. Morning has a 4ft SSW swell with a very long 16-second period, moderate cross-off wind, and combined energy at 1140 (moderate)—but the report calls it marginal. Skip it. Monday afternoon swells to 6ft, same direction and period, energy 1637 (strong), still marginal and not clean enough.

Tuesday August 18th – Wednesday August 19th: Tuesday morning brings a 4ft SSW swell, 17-second period (very long groundswell), and a moderate offshore breeze—clean and inviting. Combined energy is 995 (moderate). The comment reads “expect very good surf conditions.” This is your early standout: offshore wind, long-period swell, and tidy waves. That long period can make a beach break a bit straight, but the reef at Knights should help. Tuesday afternoon is even cleaner: 3ft SSW, 17 seconds, light offshore from N at 9 mph, energy 755 (moderate). Tuesday is the pick. Wednesday drops to 3ft and goes cross-shore and choppy—avoid.

Thursday August 20th – Saturday August 29th: A long gap of average to poor conditions. Thursday and Friday see SW swell building to 7ft, but the wind turns cross-on or cross, with energy up to 2879 (strong) on Friday—marginal and rippled. Saturday August 22nd holds 7–7ft SSW swell (strong energy at 2492), but cross and cross-on winds make it look better for kite surfing than paddle surfing. Then a lull sets in from Sunday August 23rd through late in the week—size drops, onshore winds, poor conditions.

Sunday August 27th – Late month: Things clean up. Thursday August 27th morning offers a 5ft SSW swell with 17-second period, gentle cross-off breeze from NE at 9 mph, energy 1546 (strong). Good session for advanced surfers—too big for beginners. Friday August 28th and Saturday August 29th keep 5–6ft SSW swells, gentle cross-off winds, and clean conditions. Energy stays strong (up to 1989). Solid long-range prospects, but less certain.

Monday August 31st – Tuesday September 1st: A ripper to finish. Monday morning has a 7ft SW swell, 13-second period, with a light offshore from NNE at 9 mph—clean and powerful. Combined energy is 1548 (strong). That’s expert territory at 7ft, but for those who can handle it, it’ll be excellent. Monday afternoon stays similar at 6ft. Tuesday drops to a 3ft SSW swell with cross-off wind, but marginal.

The standout: Tuesday August 18th (morning and afternoon) gives you clean offshore winds and a long-period SSW groundswell—smooth, energetic, and not too big. Then Monday August 31st offers a bigger, expert-level session with clean offshore winds.

Crowds at Knights are often, so expect company on those good days. For now, hold tight. Forecasts can shift, but this window has two clear highlights.

Rusty.

Short Range Forecast

Light rain (total 3mm), mostly falling on Tue afternoon. Very mild (max 17°C on Tue afternoon, min 12°C on Mon morning). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Very mild (max 15°C on Thu morning, min 12°C on Thu night). Wind will be generally light.

Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
3
3
3
3
3
0
0
2
2
2
3
4
3
3
3
3
4
3
2
3
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.1
SSW
16
1.7
SSW
16
1.4
SSW
15
1.1
SSW
17
1
SSW
17
1
SSW
16
0.9
SW
16
0.8
SSW
15
1.6
SW
11
1.6
SW
13
1.3
SW
13
1.7
SW
16
1.7
SW
14
2
SSW
17
2.2
SSW
16
2.2
SSW
15
2.4
SSW
16
2.5
SSW
15
2.1
SSW
14
1.8
SSW
13
1.8
SSW
15
Wave Graph
Metric surfscale
Energy kJ
659
1451
807
742
573
519
358
279
640
919
552
1431
1170
2351
2359
2212
2786
2563
1629
1169
1567
Wind (km/h)
20
NE
20
NE
20
NE
20
NE
15
N
20
NNE
25
NW
25
WNW
15
WNW
15
WNW
15
WNW
5
WNW
5
NNW
10
SW
10
WNW
10
W
10
SW
10
NW
10
WNW
10
W
10
WNW
Wind State
cross-off
cross-off
cross-off
off
off
off
cross-off
cross
cross
cross
cross
cross
glassy
cross-on
cross
cross
cross-on
cross-off
cross
cross-on
cross
High Tide
2:33PM1.01m
3:07AM1.04m
2:43PM0.98m
3:42AM1.07m
2:47PM0.96m
4:20AM1.07m
2:36PM0.94m
5:04AM1.04m
6:12AM0.99m
11:23AM1.13m
Low Tide
8:30PM0.39m
8:40AM0.58m
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
part cloud
cloud
part cloud
part cloud
rain showers
rain showers
clear
clear
part cloud
clear
part cloud
part cloud
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:54
6:54
6:52
6:50
6:50
6:48
6:48
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:44
5:44
5:45
5:45
5:46
5:46
5:47
 mm
2
1
1
Temp °C
15
15
14
15
17
14
15
15
13
15
15
12
15
14
13
15
15
13
15
15
13
Feels °C
10
10
9
12
14
10
9
10
10
12
11
11
13
12
11
12
13
11
12
12
10
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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