Surf Forecasts:
Avalon-South surf forecast from 13 Sep 2026:
- Best quality surf: Thursday 17 Sep, 10PM (local time) - 8ft (2.4m), 9s period, SSE swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 10PM (local time) - 8ft (2.4m), 9s period, SSE swell with 897 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 1AM (local time) - 5ft (1.6m), 6s period with NE swell.
Best Forecast Surf Conditions for Avalon-South this week:
The surf forecast for Avalon-South over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 14) at 1AM. The primary swell is predicted to be 1.6m and 6s period with a secondary swell of 1.3m and 6s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Avalon-South in the next 16 days are 2.4m 9s and forecast to arrive on Thursday (Sep 17) at 10PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.5m 10s period and expected on Wednesday (Sep 16) at 7PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Mon 14th Sep) | 5ft (1.6m) 6s |
| Best Surf | 10PM (Thu 17th Sep) | 8ft (2.4m) 9s |
| Most Powerful | 10PM (Thu 17th Sep) | 8ft (2.4m) 9s |
Table - best surf conditions forecast for Avalon-South over the next 16 days.
The Lowdown
Alright, this is Rusty. Let’s break down what’s happening at Avalon-South over the next couple of weeks.
Right now, we’re looking at a long, pretty bleak stretch. For the first several days, the surf is basically a write-off – we’ve got very weak, short-period windswell with messy, choppy conditions and hardly any energy behind it. For instance, on Sunday the 13th, you’re dealing with a weak 3ft NE swell at 5 seconds with only 50 units of energy. It’s just not surfable. That grim pattern hangs around through Tuesday the 16th, with the swell dropping to almost nothing and strong winds just making a mess of the surface.
There’s a glimmer of hope very early on Friday morning the 18th. That’s the standout window. A clean ESE groundswell with a long 10-second period builds to 5ft, and the energy jumps way up to 409. The wind is a light offshore from the NW, so conditions will be clean. This is the best shot in the whole forecast. It’s not huge – it’s a nice, manageable size for most surfers, and the offshore wind will hold it open. The main caveat here is that it’s a longer-period swell for a beach that’s fairly exposed to the ENE, so it might wall up a bit straight. But with glassy conditions in the morning, it’s a solid call.
After that Friday morning window, the swell drops back down into the ordinary range. Saturday the 19th has some surfable morning waves around 3ft, but it’s nothing special. The rest of the second week is mostly small, weak, or windy again, but we do see a spike on Tuesday the 22nd – a raw 6ft SSE swell with moderate energy (504), but it’s completely ruined by a strong onshore wind. That one’s for the kite crew, not for paddling.
Overall, the water temp is around 64°, which is about normal for the time of year. For the first week, don’t bother unless it’s that Friday morning window. There’s a gap of no real surf for almost four days after that. Avalon-South is fairly consistent as a break, so a run this poor isn’t normal, but here we are.
Best bet: be on the water early Friday, September 18th. Don’t expect much else.
- Rusty
Short Range ForecastMostly dry. Warm (max 23°C on Mon morning, min 11°C on Tue night). Winds increasing (light winds from the NNW on Sun night, fresh winds from the S by Tue night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Fri morning, min 9°C on Wed night). Winds decreasing (fresh winds from the S on Wed morning, light winds from the NW by Fri morning). | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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) | NE 5 | NE 5 | NE 6 | NE 6 | NE 5 | NE 6 | NE 6 | NE 7 | NE 7 | ENE 14 | S 10 | S 10 | E 13 | E 13 | ESE 8 | ESE 10 | SE 11 | ESE 11 | ESE 11 | SE 10 | SE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 30 | 56 | 207 | 54 | 66 | 177 | 61 | 46 | 18 | 20 | 0 | 0 | 7 | 3 | 175 | 409 | 476 | 418 | 238 | 108 | 35 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-off | cross | cross-on | cross-off | cross-off | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross | off | cross-off | cross-on | cross-off | off | cross-on | off |
High Tide | 9:35PM1.36m | 9:57AM1.47m | 10:15PM1.23m | 10:34AM1.44m | 10:56PM1.11m | 11:14AM1.39m | 11:41PM1.00m | 12:00PM1.32m | 00:37AM0.91m | 12:56PM1.26m | 1:51AM0.85m | 2:05PM1.23m | 3:17AM0.86m | ||||||||
Low Tide | 3:32PM0.18m | 3:40AM0.19m | 4:16PM0.23m | 4:11AM0.28m | 5:03PM0.30m | 4:43AM0.37m | 5:53PM0.38m | 5:19AM0.45m | 6:52PM0.45m | 6:03AM0.53m | 8:04PM0.49m | 7:05AM0.59m | 9:22PM0.48m | ||||||||
 |  |  |  | | | | |  | | | | | | | | | | | | | |
 | 5:58 | — | — | 5:56 | — | — | 5:54 | — | — | 5:52 | — | — | 5:52 | — | — | 5:50 | — | — | 5:48 | — | — |
 | — | 5:44 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:47 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 19 | 17 | 23 | 22 | 21 | 21 | 17 | 13 | 13 | 14 | 14 | 15 | 14 | 13 | 19 | 18 | 16 | 25 | 24 | 20 |
Feels °C | 16 | 15 | 14 | 20 | 19 | 18 | 19 | 15 | 6 | 4 | 6 | 6 | 9 | 8 | 10 | 16 | 14 | 14 | 22 | 19 | 17 |
Swell 1 Height (m) Direction Period (s) | S 11 | S 11 | NE 6 | NE 6 | S 11 | NE 6 | NE 6 | NE 7 | NE 7 | ENE 14 | — | — | E 13 | E 13 | S 9 | ESE 10 | SE 11 | ESE 11 | ESE 11 | S 9 | S 9 |
| kJ | 181 | 181 | 145 | 54 | 81 | 128 | 61 | 46 | 15 | 20 | — | — | 3 | 3 | 516 | 409 | 476 | 418 | 238 | 110 | 104 |
Swell 2 Height (m) Direction Period (s) | NE 5 | ENE 13 | S 12 | S 11 | ENE 13 | S 10 | S 10 | S 9 | ENE 13 | NE 7 | — | — | NE 13 | S 19 | ESE 8 | S 8 | S 9 | S 9 | S 9 | SE 10 | NE 5 |
| kJ | 20 | 17 | 175 | 123 | 16 | 48 | 29 | 14 | 18 | 2 | — | — | 7 | 7 | 175 | 234 | 251 | 287 | 130 | 108 | 22 |
Swell 3 Height (m) Direction Period (s) | S 17 | ENE 13 | ENE 13 | ENE 13 | — | ENE 12 | NE 13 | ENE 13 | — | — | — | — | — | — | E 13 | S 18 | S 18 | S 16 | S 14 | S 14 | SE 8 |
| kJ | 49 | 17 | 17 | 17 | — | 15 | 6 | 17 | — | — | — | — | — | — | 3 | 6 | 24 | 132 | 102 | 103 | 35 |
Wind waves Height (m) Direction Period (s) | NE 5 | NE 5 | NE 6 | — | NE 5 | NE 6 | SSW 3 | SSE 4 | S 8 | S 9 | S 10 | S 10 | S 10 | S 10 | — | — | — | — | — | ENE 3 | — |
| kJ | 30 | 56 | 207 | — | 66 | 177 | 1 | 14 | 1003 | 1526 | 3232 | 3461 | 2324 | 1729 | — | — | — | — | — | 3 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 10 | 197 | 0 | 1 | 11 | 0 | 0 | 132 | 90 | 824 | 742 | 203 | 170 | 203 | 0 | 0 | 1 | 0 | 0 | 10 | 0 |
Best forecast wave conditions in Sydney North Coast | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Avalon-South Surf forecast
The above surf forecast table for Avalon-South provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Avalon-South can be found by selecting the local surf guide option on the grey menu. Our Avalon-South 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 (Avalon-South) 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 Avalon-South 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.
Avalon-South is 13 km (8 miles) from Dee Why. If you plan a holiday in Sydney North Coast, look for hotels and other accommodation in Dee Why. Dee Why has rooms for a wide range of budgets as well as car hire and transport links.
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