Surf Forecasts:
Avalon-South surf forecast from 12 Sep 2026:
- Best quality surf: Friday 18 Sep, 10PM (local time) - 5.5ft (1.7m), 11s period, ESE swell with glassy winds.
- Most powerful swell: Thursday 17 Sep, 1PM (local time) - 10ft (3.0m), 10s period, SSE swell with 1,787 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 1AM (local time) - 5.5ft (1.7m), 6s period with NNE 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 1.7m and 6s period with a secondary swell of 1.4m 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 3.0m 10s and forecast to arrive on Thursday (Sep 17) at 1PM. Winds are predicted to be cross-shore 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 4PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Mon 14th Sep) | 5.5ft (1.7m) 6s |
| Best Surf | 10PM (Fri 18th Sep) | 5.5ft (1.7m) 11s |
| Most Powerful | 1PM (Thu 17th Sep) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Avalon-South over the next 16 days.
The Lowdown
Alright folks, Rusty here, taking a long hard look at what's coming down the pipe for Avalon-South over the next couple of weeks. I gotta be straight with you—it’s a tough stretch for most of it. We’ve got a massive gap at the start before anything even comes close to being rideable, so don't bother waxing up just yet.
For the first week, we’re looking at a desert. From Saturday the 12th right through to Friday the 18th, it’s a write-off. Tiny waves, messy wind, cross-onshore chop, the whole ugly package. The few bits of energy we see, like Wednesday the 16th, are either non-existent or blown out. You’ll be sitting on the beach for this one.
Now, hold on, because there is a light at the end of the tunnel. We’ve got a proper pulse arriving on Friday morning, September 18th. This is the standout. The swell comes up to a clean 5 ft from the ESE with a proper groundswell period of 11 seconds, packing a moderate 540 units of energy. The water’s sitting at a pretty normal 64°, so nothing weird there. The real kicker is the wind: absolutely glassy, from the NW at 3 mph. That’s what we live for—clean, lined-up waves with no wind messing them up. This is the one to circle on your calendar. Avalon-South handles that direction well, and with that kind of period, you’ll see some solid shape. Best of the whole forecast, no question.
Saturday the 19th morning offers a repeat of that magic—another glassy morning with 5 ft of ESE swell (460 units energy). But keep your head on a swivel for the afternoon chop. The window is narrow.
After that, it tapers off quickly. The rest of the period into the second week drops back into tiny, weak surf with mostly poor conditions. There’s a glimmer on Saturday the 26th with 4 ft from the NE and clean wind, but the period is short and it’s still very average stuff. By Sunday the 27th, we’re back to small, mushy leftovers.
So to sum it up: this is a "wait for Friday the 18th" forecast. That morning glass-off with the ESE groundswell is your only true standout. Don't hold your breath for anything else.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Mon afternoon. Warm (max 24°C on Mon morning, min 13°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Tue night. Warm (max 21°C on Tue morning, min 10°C on Thu night). Winds decreasing (strong winds from the SSW on Wed morning, light winds from the SW by Thu night). | ||||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | |||||||||||||||
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) | ENE 14 | ENE 14 | NE 4 | NE 5 | NE 5 | NNE 6 | NE 6 | NE 5 | NE 7 | NE 7 | NE 7 | NE 7 | ENE 14 | S 10 | ENE 13 | E 13 | SSE 9 | ESE 8 | ESE 11 | ESE 11 | ESE 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 19 | 19 | 29 | 26 | 56 | 229 | 82 | 94 | 230 | 93 | 55 | 18 | 20 | 0 | 17 | 7 | 1382 | 280 | 540 | 608 | 642 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross | cross-on | cross-on | cross-off | cross | cross-on | off | cross-off | cross-on | cross | cross-off | cross-off | cross | cross | cross | off | glassy | cross-on | cross-off |
High Tide | 8:55PM1.48m | 9:21AM1.47m | 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 | ||||||||
Low Tide | 2:47PM0.16m | 3:08AM0.11m | 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 | ||||||||
 | |  | |  | | |  | | | |  | | |  | | | | | | | |
 | 5:58 | — | — | 5:58 | — | — | 5:56 | — | — | 5:54 | — | — | 5:52 | — | — | 5:52 | — | — | 5:50 | — | — |
 | — | 5:43 | — | — | 5:44 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — |
mm | — | — | — | — | — | — | — | 3 | — | — | — | 2 | — | — | 4 | 2 | — | — | — | — | — |
Temp °C | 18 | 18 | 16 | 19 | 18 | 17 | 24 | 19 | 17 | 21 | 17 | 14 | 13 | 14 | 13 | 14 | 14 | 13 | 18 | 17 | 16 |
Feels °C | 15 | 15 | 14 | 15 | 14 | 14 | 21 | 17 | 15 | 19 | 15 | 8 | 4 | 5 | 5 | 9 | 9 | 11 | 15 | 14 | 15 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 11 | S 10 | S 11 | S 11 | NE 6 | NE 6 | S 11 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | — | ENE 13 | E 13 | E 13 | S 9 | ESE 11 | ESE 11 | ESE 11 |
| kJ | 418 | 279 | 158 | 181 | 143 | 161 | 54 | 81 | 173 | 93 | 55 | 16 | 2 | — | 17 | 3 | 3 | 516 | 540 | 608 | 642 |
Swell 2 Height (m) Direction Period (s) | S 19 | S 17 | S 20 | NE 5 | ENE 13 | S 12 | S 11 | ENE 13 | S 10 | S 10 | S 9 | ENE 13 | ENE 14 | — | — | NE 13 | NE 13 | ESE 8 | S 9 | S 9 | S 9 |
| kJ | 184 | 142 | 121 | 18 | 17 | 178 | 123 | 16 | 48 | 29 | 14 | 18 | 20 | — | — | 7 | 7 | 280 | 306 | 220 | 123 |
Swell 3 Height (m) Direction Period (s) | ENE 14 | ENE 14 | ENE 13 | S 17 | ENE 13 | ENE 13 | ENE 13 | — | ENE 12 | NE 13 | ENE 13 | — | — | — | — | — | — | E 10 | S 18 | S 18 | S 17 |
| kJ | 19 | 19 | 16 | 49 | 17 | 17 | 17 | — | 15 | 6 | 17 | — | — | — | — | — | — | 56 | 25 | 55 | 53 |
Wind waves Height (m) Direction Period (s) | — | ENE 3 | NE 4 | NE 5 | NE 5 | NNE 6 | NE 6 | NE 5 | NE 7 | SW 3 | S 5 | S 7 | S 9 | S 10 | S 10 | S 10 | SSE 9 | — | — | — | N 3 |
| kJ | — | 3 | 29 | 26 | 56 | 229 | 82 | 94 | 230 | 2 | 18 | 466 | 1879 | 4108 | 3678 | 2199 | 1382 | — | — | — | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 10 | 2 | 10 | 521 | 0 | 1 | 137 | 0 | 0 | 96 | 170 | 824 | 742 | 203 | 46 | 7 | 0 | 0 | 1 | 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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