Surf Forecasts:
Knights surf forecast from 12 Aug 2026:
- Best quality surf: Thursday 13 Aug, 6AM (local time) - 11ft (3.5m), 16s period, SSW swell with cross-shore winds.
- Most powerful swell: Thursday 13 Aug, 6AM (local time) - 11ft (3.5m), 16s period, SSW swell with 6,033 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 6AM (local time) - 11ft (3.5m), 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 Thursday (Aug 13) at 6AM. The primary swell is predicted to be 3.5m and 16s period. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Knights in the next 16 days are 3.5m 16s and forecast to arrive on Thursday (Aug 13) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Tuesday (Aug 18) at 12PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 13th Aug) | 11ft (3.5m) 16s |
| Best Surf | 6AM (Thu 13th Aug) | 11ft (3.5m) 16s |
| Most Powerful | 6AM (Thu 13th Aug) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, let's get into it. The main event here is a solid pulse of long-period groundswell that's gonna roll through Knights, backed by some tricky wind windows. The water's sitting about average for this time of year, nothing wild there.
The real standout is Thursday morning, the 13th of August. We've got a solid 12 ft swell pushing in from the SSW with a 16-second period – that's proper groundswell energy, and the combined energy is pumping at 5957, so there's plenty of power. The wind is a light cross-shore, which will keep it pretty clean, and the break is handling the size. This is the one to circle. It's a big swell, so this is for experienced surfers only.
Friday and Saturday the swell drops back a touch, but the wind gets messy with onshore and cross-onshore conditions, so it's going to be a bit of a write-off for clean waves. Sunday sees the swell dropping to 6 ft, but the wind is still not ideal.
Then we get a little window Monday the 17th through Tuesday the 18th. Swell is smaller, around 4 ft to 6 ft, but the wind turns offshore and cross-offshore, and the period is still a very long 16 to 17 seconds. The combined energy is still moderate, and conditions are clean. Not the size of Thursday, but a solid option for a paddle.
Wednesday the 19th is small, only 3 ft to 3 ft, but the wind is offshore and clean. That's fun for a longboard or a fish, but not much push.
The end of the first week and into the second week gets a bit messy. Thursday the 20th through Saturday the 22nd is a mix of clean but small surf and then some strong cross-onshore winds that will make it choppy and poor. Sunday the 23rd and Monday the 24th see a big jump in swell again, with 10 ft to 13 ft on the cards, but the wind is onshore or cross-onshore, so it's going to be a washing machine. Too much energy and bad wind.
The very end of the outlook, around Wednesday the 26th and Thursday the 27th of August, shows promise. The swell drops to a more manageable 4 ft to 7 ft, but the period is a super long 18 seconds, and the wind is offshore or cross-offshore, keeping it clean. The combined energy is still moderate to strong, so there's some real punch in those sets. This is a good backup for the experienced crew, but it's a long way out, so keep an eye on it.
Honestly, the best bet is that Thursday morning, the 13th. Get out there if you can handle it.
Rusty.
Short Range ForecastMostly dry. Very mild (max 15°C on Thu morning, min 12°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Tue afternoon. Very mild (max 18°C on Tue morning, min 10°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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 16 | SSW 16 | SSW 16 | 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 16 | SSW 16 |
Wave Graph  | |||||||||||||||||||
 kJ | 5506 | 5957 | 4885 | 5808 | 4797 | 4136 | 4084 | 3348 | 2741 | 1956 | 1484 | 1396 | 1064 | 798 | 1586 | 911 | 932 | 838 | 430 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross-on | on | cross-on | cross | cross | cross | cross | cross-on | cross | cross-off | cross-off | off | off | off | off |
High Tide | 1:01AM0.63m | 1:30PM1.27m | 1:16AM0.71m | 1:49PM1.20m | 1:38AM0.81m | 2:06PM1.12m | 2:04AM0.90m | 2:20PM1.06m | 2:35AM0.98m | 2:33PM1.01m | 3:07AM1.04m | 2:43PM0.98m | |||||||
Low Tide | 5:36AM0.40m | 9:03PM0.52m | 6:23AM0.35m | 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 | |||||||
 |  | | | |  |  | | | | |  |  | | | | |  | | |
 | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — |
 | — | — | 5:40 | — | — | 5:40 | — | — | 5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:44 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — |
Temp °C | 13 | 15 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 16 | 17 | 14 | 18 | 18 | 14 |
Feels °C | 10 | 11 | 12 | 12 | 12 | 12 | 12 | 11 | 9 | 9 | 8 | 8 | 10 | 12 | 13 | 11 | 13 | 14 | 9 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | 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 16 | SSW 16 |
| kJ | 5506 | 5957 | 4885 | 5808 | 4797 | 4136 | 4084 | 3348 | 2741 | 1956 | 1484 | 1396 | 1064 | 440 | 1586 | 911 | 932 | 838 | 430 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 16 | SSW 22 | SSW 19 | SW 13 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 798 | 185 | 572 | 175 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 24 | SW 22 | WSW 19 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 55 | 122 | 450 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | ESE 3 | — | SSE 4 | E 3 | — | NE 4 | NE 4 | NE 4 | NNE 4 |
| kJ | — | — | — | — | — | — | — | — | — | — | 3 | — | 10 | 2 | — | 28 | 28 | 34 | 13 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1 | 2 | 2 | 2 | 2 | 137 | 137 | 0 | 168 | 0 | 0 | 164 | 0 | 0 | 166 | 0 | 0 | 0 | 0 |
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.
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