
Surf Forecasts:
Knights surf forecast from 9 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 9AM (local time) - 13ft (4.0m), 16s period, SW swell with cross-shore winds.
- Most powerful swell: Monday 10 Aug, 6AM (local time) - 11ft (3.5m), 19s period, SSW swell with 9,000 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 12AM (local time) - 8ft (2.4m), 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 11) at 12AM. The primary swell is predicted to be 2.4m and 16s period with a secondary swell of 0.7m and 7s. 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 3.5m 19s and forecast to arrive on Monday (Aug 10) 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 0.9m 4s period and expected on Tuesday (Aug 11) at 12PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 11th Aug) | 8ft (2.4m) 16s |
| Best Surf | 9AM (Wed 12th Aug) | 13ft (4.0m) 16s |
| Most Powerful | 6AM (Mon 10th Aug) | 11ft (3.5m) 19s |
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. This is a beach-and-reef setup, advanced level, and it’s fairly consistent, so it’s got potential. The water temperature is sitting at 57°, which is about average for the time of year, no surprises there.
The first worthwhile window is Sunday morning, 9th August. We’ve got a 4ft SSW swell rolling in with a 14-second period, and a light N cross-off breeze. It’s clean, but the energy is moderate (720). It’s a bit marginal, but it’s a start. The real standout on Sunday is the afternoon. The swell gets a little bump to 5ft from the SSW, period jumps to 16 seconds, and the wind swings to a light NNW cross-off. The combined energy kicks up to 2168, and the report says it’s excellent for experienced surfers. That’s the pick of the first week.
Monday 10th August is a write-off. The swell jumps to 12ft, period is 18 seconds, but the wind is howling onshore from the SW at 30 km/h, and the energy is massive (12829). It’s messy and too big for most. Tuesday 11th is better, with the swell dropping to 6ft, period 14 seconds, and clean NNW cross-off winds. The energy is moderate (1389), but the conditions are clean. That’s a solid option for a surf.
Wednesday 12th August morning is a hard pass. The swell is 13ft from the SW with a 16-second period, and the wind is cross-shore from the W. The report says it’s too big for this break, and the energy is 14563. That’s for experts only or maybe kite surfers. The rest of the week into the weekend is a mix of 8ft to 10ft SSW swell with cross-on winds, so it’s choppy and not worth getting excited about.
Now, looking into the second week, things get interesting again. Monday 17th August morning has a 4ft SSW swell, 13-second period, and a light NE cross-off breeze. The energy is moderate (897), and it’s clean. Tuesday 18th August is where it’s at. The morning is 3ft, 18-second period, with a NE offshore wind – light and clean, energy 1134. The afternoon is even better: 5ft, 18-second period, with a NNE glassy wind. The energy is 1735, and it’s glassy. That’s a standout for the second week. Wednesday 19th stays clean with 5ft, 16-second period, and offshore winds.
Friday 21st August morning is another gem: 4ft, 14-second period, glassy SW wind, energy 1859. Saturday 22nd August morning is also clean with 6ft, 14-second period, NNE offshore wind, energy 1370. The last few days of the forecast, 23rd and 24th, see the swell building back to 7ft to 10ft, but the winds are cross-on and choppy, so not ideal.
Overall, the best on offer is Sunday afternoon 9th August and Tuesday 18th August. The Sunday afternoon session has that 5ft SSW groundswell with a 16-second period and clean cross-off winds – excellent quality. Tuesday 18th August has the glassy, offshore conditions with a 5ft, 18-second groundswell. That’s the kind of session you wait for.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Sun afternoon. Very mild (max 16°C on Sun morning, min 9°C on Tue night). Winds decreasing (fresh winds from the SSW on Sun night, light winds from the WNW by Mon night). | Days 4-6 Weather SummarySome drizzle, heaviest during Wed afternoon. Very mild (max 15°C on Thu morning, min 11°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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) | SSW 14 | SSW 16 | SW 19 | SSW 18 | SW 17 | SSW 16 | SSW 14 | SSW 14 | SW 16 | SW 16 | SW 17 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 |
Wave Graph | |||||||||||||||||||||
607 | 1141 | 5125 | 8187 | 5769 | 2827 | 1389 | 1057 | 4899 | 8568 | 8689 | 4410 | 3899 | 3629 | 3678 | 4340 | 3623 | 3170 | 2777 | 2119 | 1624 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | on | on | cross-on | cross-off | cross-off | cross-off | cross-on | cross | cross-on | cross | cross-on | cross-on | cross | cross | on | cross-on | cross-on | cross-on | cross-off |
High Tide | 11:49AM1.29m | 12:17PM1.35m | 1:19AM0.55m | 12:44PM1.37m | 00:58AM0.58m | 1:09PM1.34m | 1:01AM0.63m | 1:30PM1.27m | 1:16AM0.71m | 1:49PM1.20m | 1:38AM0.81m | 2:06PM1.12m | 2:04AM0.90m | ||||||||
Low Tide | 9:20PM0.42m | 9:28PM0.43m | 9:32PM0.46m | 4:36AM0.47m | 9:25PM0.50m | 5:36AM0.40m | 9:03PM0.52m | 6:23AM0.35m | 8:38PM0.51m | 7:03AM0.35m | 8:25PM0.47m | ||||||||||
7:03 | — | — | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | |
— | 5:37 | — | — | 5:37 | — | — | 5:38 | — | — | 5:39 | — | — | 5:40 | — | — | 5:40 | — | — | 5:42 | — | |
mm | 1 | 4 | 4 | — | — | — | — | — | 3 | — | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 15 | 13 | 13 | 12 | 12 | 14 | 15 | 13 | 14 | 13 | 12 | 15 | 15 | 14 | 15 | 14 | 13 | 13 | 12 | 13 |
Feels °C | 13 | 13 | 8 | 7 | 7 | 7 | 8 | 9 | 7 | 8 | 8 | 9 | 11 | 12 | 12 | 12 | 11 | 12 | 8 | 8 | 10 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 16 | SW 19 | SW 18 | SW 17 | SSW 16 | SSW 14 | SSW 14 | — | SW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 |
607 | 1141 | 5125 | 4642 | 4227 | 2827 | 1389 | 1057 | — | 8568 | 5258 | 4410 | 3899 | 3629 | 3678 | 4340 | 3623 | 3170 | 2777 | 2119 | 1624 | |
Swell 2 Height (m) Direction Period (s) | SSW 18 | SSW 16 | — | — | S 7 | SSE 7 | — | SSW 18 | — | — | — | — | — | — | — | — | — | — | — | — | — |
31 | 1027 | — | — | 147 | 51 | — | 623 | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | SW 18 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
82 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | N 3 | — | SSW 19 | SSW 18 | SSW 17 | — | NW 4 | NW 4 | SW 16 | SSW 16 | SW 17 | — | — | — | — | — | — | — | — | — | — |
6 | — | 3766 | 8187 | 5769 | — | 16 | 17 | 4899 | 5995 | 8689 | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 0 | 411 | 518 | 916 | 0 | 464 | 577 | 870 | 570 | 571 | 2 | 100 | 2 | 2 | 2 | 137 | 137 | 164 | 169 | 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.











