
Surf Forecasts:
Knights surf forecast from 5 Aug 2026:
- Best quality surf: Monday 10 Aug, 3AM (local time) - 11ft (3.5m), 19s period, SW swell with cross-onshore winds.
- Most powerful swell: Wednesday 12 Aug, 6AM (local time) - 15ft (4.5m), 16s period, SW swell with 10,631 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 12PM (local time) - 2.5ft (0.8m), 19s 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 Wednesday (Aug 05) at 12PM. The primary swell is predicted to be 0.8m and 19s period with a secondary swell of 1.0m and 9s. Another secondary swell of 0.9m and 14s is also forecast. 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 4.5m 16s and forecast to arrive on Wednesday (Aug 12) 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 1.5m 5s period and expected on Tuesday (Aug 11) at 12PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Wed 5th Aug) | 2.5ft (0.8m) 19s |
| Best Surf | 3AM (Mon 10th Aug) | 11ft (3.5m) 19s |
| Most Powerful | 6AM (Wed 12th Aug) | 15ft (4.5m) 16s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright folks, Rusty here with the lowdown on the waves ahead.
We’ve got a good stretch of surf lined up at Knights, with a long period SSW groundswell sticking around. Water temp is about 58°F, which is right around average for this time of year, nothing unusual.
First surf worth a look is Wednesday morning, August 5th. Small waves at 3 ft from the SSW with a very long 19-second period. That’s a clean groundswell that will wrap in nicely. Wind is light cross-off from the north at just 3 mph, so the surface will be glassy. The wave energy is moderate at 945, so nothing heavy, but the conditions are clean and user-friendly. Wednesday afternoon holds similar, still clean.
Thursday the 6th is a step down. Swell picks up to 4 ft, but the wind turns onshore from the west at 9 mph, making it choppy. Not worth it.
Here’s the highlight for the first week. Friday morning, August 7th. Glassy, clean conditions with a light offshore breeze from the NNE at 6 mph. Swell is a solid 7 ft from the SSW at 16 seconds. That’s strong wave energy at 2002. This is for advanced surfers – clean, powerful, and the offshore wind will keep it tidy. The crowds will often be there, so expect some company.
Friday afternoon stays clean, but the wind shifts cross-off and the swell drops a little.
The weekend is a downgrade. Saturday and Sunday have decent swell, but the wind builds. Sunday afternoon especially gets hit by a 22 mph cross-on from the WSW, making it lumpy. The combined energy hits 3433, but the messy wind kills the quality.
Monday August 10th through Thursday the 14th is a period for the big-wave crew or kite gear. Swell sizes run from 10 ft up to 15 ft. The energy readings are massive (9748, 4959, 8543, 10455), but the wind is cross or onshore and mostly fresh. It’s too big for paddle surfing here. For most, it’s a write-off.
Now for the second week, there’s a real standout. Saturday morning, August 15th. Absolutely glassy calm, wind at 0 mph. Swell is still a heavy 10 ft from the SSW at 16 seconds, with energy at 3717. This is for experienced surfers only due to the size, but with glassy conditions and that long period groundswell, it’ll be a clean, powerful day. The break should handle it, and the size will thin out the crowd.
Monday the 17th the swell drops to a friendlier 4 ft to 5 ft. Morning has a light offshore from the NNE at 6 mph, so clean small waves. Afternoon is cross-off, still clean but small.
Tuesday the 18th the swell builds again to 8 ft, wind is up to 12 mph cross-off. It’s clean, but big, so another one for the advanced.
Finally, Wednesday August 19th offers another beauty. Glassy in the morning with a light offshore from the NE at 3 mph, and a solid 8 ft SSW groundswell at 17 seconds. Combined energy is 4517. The glassy conditions and long period will produce some serious, clean lines. This is for experienced surfers only. Crowds will be likely.
The best calls are Friday August 7th for clean, powerful waves, and Saturday August 15th or Wednesday August 19th for the glassy, big-swell days for the pros. The middle period is mostly oversized, windy swell that’s more for kite surfing than paddle surfing.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Fri night. Very mild (max 17°C on Fri morning, min 9°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 15mm), heaviest on Sat night. Very mild (max 15°C on Sat morning, min 9°C on Sun afternoon). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | |||||||||||||||
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 19 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 16 | SSW 15 | SSW 17 | SSW 16 | SSW 15 | SW 14 | SW 14 | SW 16 | SW 19 | SW 18 | SSW 17 | SSW 16 | SW 14 | SW 14 | SW 17 |
Wave Graph | |||||||||||||||||||||
470 | 413 | 1032 | 666 | 788 | 1368 | 1931 | 1222 | 1754 | 1273 | 1206 | 1002 | 733 | 2668 | 6939 | 6545 | 4539 | 1982 | 1470 | 2223 | 9747 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | on | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-on | cross | cross |
High Tide | 3:20PM0.96m | 4:39AM1.06m | 2:51PM0.93m | 5:32AM1.07m | 11:20AM1.18m | 11:49AM1.29m | 12:17PM1.35m | 1:19AM0.55m | 12:44PM1.37m | 00:58AM0.58m | |||||||||||
Low Tide | 9:13PM0.48m | 9:28AM0.85m | 9:08PM0.47m | 8:35AM1.01m | 9:07PM0.45m | 9:11PM0.43m | 9:20PM0.42m | 9:28PM0.43m | 9:32PM0.46m | ||||||||||||
7:07 | — | — | 7:07 | — | — | 7:05 | — | — | 7:05 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — | |
— | 5:35 | — | — | 5:35 | — | — | 5:36 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | |
mm | — | — | — | — | — | — | — | — | 2 | — | 2 | 5 | 1 | 3 | — | — | — | 4 | — | 1 | — |
Temp °C | 13 | 12 | 12 | 15 | 14 | 12 | 17 | 16 | 16 | 15 | 13 | 13 | 12 | 11 | 11 | 12 | 14 | 13 | 13 | 13 | 12 |
Feels °C | 10 | 9 | 9 | 13 | 12 | 11 | 12 | 12 | 12 | 10 | 8 | 9 | 5 | 5 | 5 | 8 | 9 | 7 | 6 | 6 | 8 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 14 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 16 | SSW 15 | SSW 17 | SSW 16 | SSW 15 | SW 14 | SSW 18 | SW 16 | SW 19 | SW 18 | SSW 17 | SSW 16 | SW 14 | SW 22 | SW 17 |
211 | 294 | 1032 | 666 | 788 | 1368 | 1931 | 1222 | 1754 | 1273 | 1206 | 1002 | 31 | 1764 | 6939 | 6545 | 4539 | 1982 | 1470 | 118 | 9747 | |
Swell 2 Height (m) Direction Period (s) | SSW 14 | SSW 8 | SW 13 | S 8 | SSW 8 | SSW 7 | SSW 20 | SSW 18 | S 7 | — | WNW 5 | — | SW 18 | SW 22 | — | SSW 18 | — | — | WSW 12 | N 6 | — |
264 | 118 | 172 | 32 | 24 | 18 | 151 | 572 | 4 | — | 2 | — | 246 | 690 | — | 3413 | — | — | 694 | 1 | — | |
Swell 3 Height (m) Direction Period (s) | SSW 19 | SSW 18 | SSW 8 | SSW 8 | W 6 | S 8 | WSW 6 | S 6 | — | — | — | — | SW 18 | — | — | — | — | — | — | — | — |
470 | 413 | 44 | 12 | 3 | 10 | 3 | 3 | — | — | — | — | 82 | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | WNW 4 | — | S 8 | — | SE 6 | NW 3 | NW 3 | N 4 | NNW 4 | NNW 4 | SW 14 | SW 16 | — | — | — | NW 4 | NW 4 | SW 14 | SW 17 |
— | — | 5 | — | 33 | — | 9 | 4 | 8 | 18 | 15 | 15 | 733 | 2668 | — | — | — | 33 | 53 | 2223 | 8188 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 3 | 157 | 0 | 0 | 2 | 0 | 1 | 577 | 276 | 2 | 336 | 578 | 159 | 2 | 404 | 870 | 1020 | 1020 |
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.











