Surf Forecasts:
Knights surf forecast from 15 Sep 2026:
- Best quality surf: Tuesday 22 Sep, 6AM (local time) - 8ft (2.5m), 15s period, SSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 22 Sep, 3PM (local time) - 10ft (3.0m), 16s period, SSW swell with 4,056 kJ wave energy.
- Next surfable swell (1★+): Thursday 17 Sep, 3AM (local time) - 8ft (2.5m), 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 Thursday (Sep 17) at 3AM. The primary swell is predicted to be 2.5m and 15s period. 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 16s and forecast to arrive on Tuesday (Sep 22) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Sunday (Sep 20) at 3AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 17th Sep) | 8ft (2.5m) 15s |
| Best Surf | 6AM (Tue 22nd Sep) | 8ft (2.5m) 15s |
| Most Powerful | 3PM (Tue 22nd Sep) | 10ft (3.0m) 16s |
Table - best surf conditions forecast for Knights over the next 16 days.
The Lowdown
Alright, Rusty here, checking out the local stretch. We’ve got one main break in the mix, and it’s a story of waiting through some slop for the really good stuff.
Overall, we’ve got a solid run of south-southwest groundswell, but the wind is the enemy early on. The water temp is pretty normal for this time of year.
Let’s start with the first real chance. Thursday, 17 September. After some big, messy surf on Wednesday, Thursday morning at Knights cleans right up. We’re looking at a 7ft swell from the SSW with a 14-second period. The wind is a light offshore from the ENE, so it’ll be clean. The energy is solid at (1969), but it’s for advanced surfers. Thursday afternoon drops a touch to 7ft but the wind turns side-shore.
Friday, 18 September is another good one. The swell is 6ft in the morning with a very long 17-second period. That kind of groundswell makes a reef-and-beach set-up like Knights really stand up. With a clean, cross-offshore wind from the NW, it’s a solid session.
The swell fades over the weekend. Saturday 19 and Sunday 20 are small and poor with onshore winds. There’s a gap of a few days of not-great conditions.
The next big moment is Tuesday, 22 September. This is a heavy day. A big pulse of 10ft from the SSW with a 16-second period. The energy is huge at (4056). This is expert-only territory – way over 8ft. The good news is a clean, cross-offshore wind from the east all day. Tuesday afternoon is the real standout for the chargers.
Wednesday, 23 September is another clean one. The swell is 7ft in the morning, and the wind is true offshore from the NNE. The energy is still high (1728), and it’s marked as excellent for advanced surfers.
Looking further out, Saturday, 26 September is a wild card. The swell is only 4ft in the morning, but the period is a ridiculous 21 seconds – that’s pure ocean energy. The energy reading (2554) is very high for that size. With a light offshore from the NE, it could be an incredible, glassy morning session. The afternoon gets gusty, so it’s an early call.
Tuesday, 29 September is another one to remember. A clean 7ft from the SSW with a 12-second period and a cross-offshore wind from the east. It’s marked as excellent for experienced surfers.
For the absolute best on offer, I’d say Tuesday afternoon, 22 September for raw power, and Saturday morning, 26 September for pure, long-period quality. Both are only for experts. Crowds are likely at Knights when it’s good, so plan for that.
One more thing: when the swell is big and the wind is onshore, like on Monday, 21 September, the whole setup is a mess. With 7ft and a strong side-onshore wind, it’s more of a kite-surfing day than a paddle session. Don’t bother with the rough stuff.
Keep your eyes on the horizon.
Rusty
Short Range ForecastMostly dry. Very mild (max 18°C on Fri morning, min 6°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Sat night, min 12°C on Mon afternoon). Winds increasing (light winds from the NNW on Fri night, fresh winds from the NW by Sat night). | ||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | ||||||||||||||
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 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 17 | SSW 16 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | SSW 14 | SSW 14 | SSW 12 | SSW 13 | SSW 14 |
Wave Graph  | |||||||||||||||||||
 kJ | 3731 | 3986 | 3940 | 3251 | 1969 | 1465 | 1333 | 1878 | 1165 | 638 | 368 | 299 | 190 | 220 | 394 | 752 | 1197 | 1100 | 2557 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross | cross-off | cross | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 2:44AM1.15m | 2:04PM0.86m | 3:14AM1.14m | 2:04PM0.84m | 3:46AM1.10m | 1:40PM0.82m | 4:20AM1.03m | 5:04AM0.95m | 10:56AM0.97m | ||||||||||
Low Tide | 8:39AM0.56m | 7:47PM0.24m | 9:02AM0.66m | 8:00PM0.26m | 9:18AM0.76m | 8:09PM0.29m | 8:56AM0.84m | 8:13PM0.32m | 8:06AM0.88m | 8:11PM0.35m | 8:01PM0.37m | ||||||||
 |  |  |  | | | | | | | | | | | | | | | | |
 | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — | 6:07 | — | — |
 | 6:05 | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 11 | 10 | 10 | 9 | 12 | 13 | 13 | 18 | 18 | 18 | 22 | 22 | 23 | 19 | 17 | 14 | 13 | 12 | 11 |
Feels °C | 6 | 6 | 6 | 5 | 9 | 10 | 10 | 13 | 14 | 15 | 17 | 18 | 18 | 16 | 13 | 11 | 10 | 7 | 7 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 17 | SSW 16 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | SSW 14 | SSW 14 | SSW 12 | SSW 13 | SSW 14 |
| kJ | 3731 | 3986 | 3940 | 3251 | 1969 | 1465 | 1333 | 1878 | 1165 | 638 | 368 | 299 | 190 | 220 | 394 | 752 | 1197 | 1100 | 2557 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | SSW 19 | — | — | — | S 19 | SW 20 | SW 18 | SSW 12 | SW 11 | — | — | SSW 16 | — |
| kJ | — | — | — | — | — | — | 37 | — | — | — | 7 | 15 | 80 | 129 | 58 | — | — | 298 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | S 19 | WSW 6 | NE 4 | — | — | — | SSW 16 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 7 | 4 | 1 | — | — | — | 534 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | NW 3 | WNW 3 | NW 3 | NW 3 | NW 3 | N 3 | W 4 | SW 6 | SW 7 | — | — | — |
| kJ | — | — | — | — | — | — | — | 5 | 4 | 2 | 3 | 4 | 7 | 9 | 47 | 84 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 137 | 0 | 166 | 0 | 0 | 33 | 0 | 2 | 2 | 0 | 0 | 0 | 1 | 583 | 585 | 2 | 137 | 167 | 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.
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