Surf Forecasts:
Avalon-South surf forecast from 20 Aug 2026:
- Best quality surf: Thursday 20 Aug, 10PM (local time) - 5ft (1.6m), 6s period, NE swell with cross-offshore winds.
- Most powerful swell: Thursday 20 Aug, 10PM (local time) - 5ft (1.6m), 6s period, NE swell with 200 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 10PM (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 Thursday (Aug 20) at 10PM. The primary swell is predicted to be 1.6m 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 1.6m 6s and forecast to arrive on Thursday (Aug 20) 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 1.0m 8s period and expected on Sunday (Aug 23) at 1PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Thu 20th Aug) | 5ft (1.6m) 6s |
| Best Surf | 10PM (Thu 20th Aug) | 5ft (1.6m) 6s |
| Most Powerful | 10PM (Thu 20th Aug) | 5ft (1.6m) 6s |
Table - best surf conditions forecast for Avalon-South over the next 16 days.
The Lowdown
Alright, let’s break down what’s coming for Avalon-South. It starts real slow, but there’s a proper swell later on if you can wait.
First week’s a dud. From Thursday the 20th through Monday the 24th, the waves are tiny, mostly under 3 feet, and the wind’s all over the place. Don’t bother.
Things start to look a little better around Tuesday the 25th, but still nothing special. On Friday the 28th, you get a glassy morning with a small 2ft swell from the ENE, but the energy’s weak. It’s rideable, just.
Now, Saturday the 29th of August brings a jump to 6ft from the NE, with strong combined energy (578). That’s proper size, but the wind’s cross-shore and messy. More for experienced surfers only – 6ft is too big for beginners.
The real winner is Wednesday the 2nd of September. Morning has light offshore wind from the west, a clean 5ft swell from the ENE, and a long 11-second period. That’s groundswell with good shape and energy (408). The offshore breeze will make for some beautiful, clean waves. Thursday the 3rd morning is nearly as good with 5ft and clean cross-offshore wind.
Crowds are often here, so aim for a mid-week session to dodge the pack.
Water temp is around 64°F, pretty normal for August.
Bottom line: the first week is a bust. The second week has some size, but the best call is Wednesday the 2nd of September morning. It’s a bit out, but it’s looking solid.
Rusty
Short Range ForecastMostly dry. Warm (max 21°C on Thu morning, min 12°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 26mm), heaviest during Tue night. Warm (max 20°C on Mon morning, min 13°C on Sun night). Winds increasing (calm on Mon night, fresh winds from the S by Tue night). | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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 6 | NE 6 | ENE 6 | ENE 6 | NE 6 | ENE 6 | NE 6 | NE 6 | NE 6 | NE 6 | ENE 9 | NE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 60 | 75 | 126 | 51 | 38 | 14 | 9 | 9 | 9 | 10 | 30 | 57 | 68 | 82 | 55 | 32 | 103 | 99 | 82 | 82 | 78 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-off | cross-off | cross-off | cross-off | off | cross-on | cross-off | glassy | on | cross | cross-off | cross-on | glassy | glassy | cross-off | cross-off | cross-off | cross | cross |
High Tide | 1:50PM1.27m | 2:20AM0.87m | 2:55PM1.26m | 3:43AM0.85m | 4:00PM1.28m | 4:55AM0.88m | 4:58PM1.34m | 5:47AM0.93m | 5:46PM1.40m | 6:30AM1.00m | 6:27PM1.47m | 7:07AM1.08m | 7:04PM1.52m | ||||||||
Low Tide | 8:48PM0.52m | 7:50AM0.53m | 10:06PM0.50m | 9:00AM0.55m | 11:10PM0.45m | 10:09AM0.54m | 11:58PM0.38m | 11:07AM0.49m | 00:37AM0.31m | 11:56AM0.43m | 1:12AM0.24m | 12:39PM0.37m | 1:43AM0.18m | ||||||||
 |  |  | | | |  | |  | | | | | | |  | |  | |  | | |
 | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — | 6:24 | — | — | 6:22 | — | — | 6:20 | — | — |
 | — | 5:28 | — | — | 5:28 | — | — | 5:29 | — | — | 5:30 | — | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 4 | 21 | 4 | 1 | — |
Temp °C | 21 | 20 | 19 | 20 | 20 | 16 | 19 | 18 | 16 | 17 | 16 | 16 | 20 | 19 | 18 | 16 | 19 | 13 | 13 | 15 | 15 |
Feels °C | 18 | 17 | 17 | 17 | 16 | 13 | 17 | 16 | 15 | 15 | 13 | 14 | 18 | 16 | 16 | 13 | 17 | 9 | 7 | 9 | 11 |
Swell 1 Height (m) Direction Period (s) | ENE 6 | SE 7 | ENE 6 | ENE 6 | NE 6 | ENE 6 | NE 6 | NE 6 | NE 6 | S 10 | S 8 | S 10 | ENE 6 | S 10 | ENE 6 | ENE 6 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 40 | 23 | 126 | 51 | 38 | 14 | 9 | 9 | 9 | 154 | 127 | 198 | 68 | 138 | 55 | 31 | 103 | 99 | 82 | 82 | 78 |
Swell 2 Height (m) Direction Period (s) | ESE 6 | E 10 | S 12 | S 11 | SE 7 | S 10 | SSW 6 | SSW 5 | S 8 | SSE 4 | S 14 | ENE 9 | S 10 | S 16 | S 10 | S 9 | S 9 | S 16 | S 10 | S 9 | S 6 |
| kJ | 37 | 2 | 3 | 2 | 2 | 2 | 6 | 5 | 1 | 10 | 138 | 7 | 125 | 21 | 94 | 61 | 57 | 20 | 17 | 7 | 33 |
Swell 3 Height (m) Direction Period (s) | E 11 | — | — | — | S 11 | SE 8 | S 9 | S 8 | S 12 | NE 6 | E 14 | E 14 | S 16 | E 13 | ENE 9 | ENE 9 | S 16 | — | S 16 | S 15 | SE 6 |
| kJ | 2 | — | — | — | 2 | 2 | 2 | 12 | 3 | 10 | 4 | 4 | 21 | 3 | 8 | 32 | 20 | — | 20 | 18 | 28 |
Wind waves Height (m) Direction Period (s) | NE 6 | NE 6 | — | NW 2 | WNW 3 | NW 3 | — | — | SSW 5 | — | ENE 9 | NE 5 | NW 4 | ENE 6 | WSW 2 | — | S 3 | S 4 | SSE 5 | SSE 6 | — |
| kJ | 60 | 75 | — | 1 | 2 | 5 | — | — | 7 | — | 30 | 57 | 3 | 82 | 1 | — | 1 | 40 | 46 | 53 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 66 | 0 | 2 | 57 | 242 | 253 | 383 | 47 | 2 | 10 | 2 | 0 | 135 | 0 | 0 | 1 | 161 | 196 | 225 | 7 |
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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