Surf Forecasts:
Avalon-South surf forecast from 17 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 4AM (local time) - 3.5ft (1.0m), 7s period, ESE swell with glassy winds.
- Most powerful swell: Wednesday 19 Aug, 4PM (local time) - 3.5ft (1.1m), 10s period, ESE swell with 235 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 4AM (local time) - 3.5ft (1.0m), 7s period with ESE 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 Tuesday (Aug 18) at 4AM. The primary swell is predicted to be 1.0m and 7s period with a secondary swell of 0.3m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Avalon-South in the next 16 days are 1.1m 10s and forecast to arrive on Wednesday (Aug 19) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 9s period and expected on Monday (Aug 17) at 4PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Tue 18th Aug) | 3.5ft (1.0m) 7s |
| Best Surf | 4AM (Tue 18th Aug) | 3.5ft (1.0m) 7s |
| Most Powerful | 4PM (Wed 19th Aug) | 3.5ft (1.1m) 10s |
Table - best surf conditions forecast for Avalon-South over the next 16 days.
The Lowdown
G’day, I’m Rusty. Let’s talk about what’s shaping up for the Avalon-South stretch over the next couple of weeks.
To be honest, it’s a rough start. The first real chance of a wave doesn’t show up until Wednesday, August 19th, and even that’s a tiny one. Water temp is sitting at 63°F, which is about 1°F below the norm for this time of year – nothing too unusual.
Wednesday morning, August 19th, it’s flat calm with glassy conditions, but the swell is only 2ft from the ESE at 10 seconds. The combined energy is weak (150). You could paddle out, but it’s barely surfable.
The next little window comes on Thursday, August 27th in the morning. Clean conditions with a light offshore breeze, but the swell is just 3ft from the SSE at 10 seconds. Combined energy is moderate (224). Still very ordinary.
Then things get interesting. On Friday morning, August 28th, the swell jumps to 6ft from the NE with an 8-second period. The combined energy is 803 – strong. The wind is light and cross-onshore, so a bit of texture, but it’s the biggest swell of the period. This one’s for experienced surfers given the size.
Saturday morning, August 29th, is the real standout. Glassy conditions, swell 5ft from the NE at 9 seconds, and combined energy at 657 – strong. The wind is light and glassy. The swell direction is a touch off the ideal ENE, but the clean conditions and solid size make this the best session of the whole forecast. The period is moderate, so it’ll be a bit walled up at this beach break, but still the pick.
After that, it’s back to small and messy. From Sunday, August 30th onward, onshore winds and tiny waves take over. The last few days into early September are all lumpy cross-onshore breezes and nothing worth paddling for.
So, save your energy for the 28th and 29th of August. Saturday morning, the 29th, is your best bet – get out there early.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Mon morning. Very mild (max 17°C on Wed morning, min 13°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Fri night. Warm (max 21°C on Thu morning, min 12°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
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) | ESE 7 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | ESE 8 | ESE 10 | ESE 10 | SE 9 | ESE 7 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | NE 6 | NE 9 | ENE 9 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 102 | 83 | 96 | 99 | 84 | 100 | 80 | 235 | 81 | 40 | 64 | 51 | 39 | 23 | 14 | 15 | 15 | 13 | 37 | 30 | 28 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | on | on | glassy | glassy | cross-on | cross-off | cross-off | cross | cross-off | cross-off | glassy | cross-off | cross-off | cross-on | glassy | cross | cross-on | cross-off |
High Tide | 11:22AM1.36m | 11:27PM1.21m | 12:05PM1.34m | 00:13AM1.06m | 12:54PM1.30m | 1:08AM0.94m | 1:50PM1.27m | 2:20AM0.87m | 2:55PM1.26m | 3:43AM0.85m | 4:00PM1.28m | 4:55AM0.88m | 4:58PM1.34m | ||||||||
Low Tide | 5:31PM0.36m | 5:35AM0.29m | 6:27PM0.43m | 6:12AM0.38m | 7:32PM0.49m | 6:55AM0.47m | 8:48PM0.52m | 7:50AM0.53m | 10:06PM0.50m | 9:00AM0.55m | 11:10PM0.45m | 10:09AM0.54m | 11:58PM0.38m | ||||||||
 |  |  |  | |  |  | | | |  |  | | | | | |  | | | | |
 | 6:31 | — | — | 6:31 | — | — | 6:28 | — | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — |
 | — | 5:25 | — | — | 5:25 | — | — | 5:27 | — | — | 5:28 | — | — | 5:28 | — | — | 5:29 | — | — | 5:30 | — |
mm | 2 | — | 3 | 1 | — | — | — | — | — | — | — | — | — | 1 | 5 | — | — | — | — | — | — |
Temp °C | 16 | 16 | 15 | 16 | 16 | 16 | 17 | 16 | 16 | 21 | 19 | 19 | 18 | 16 | 14 | 17 | 16 | 15 | 18 | 18 | 17 |
Feels °C | 13 | 13 | 13 | 13 | 14 | 15 | 15 | 13 | 14 | 18 | 17 | 17 | 16 | 15 | 12 | 14 | 13 | 15 | 15 | 15 | 14 |
Swell 1 Height (m) Direction Period (s) | ESE 7 | ESE 7 | ESE 7 | S 11 | ESE 7 | ESE 8 | SE 7 | ESE 10 | NE 5 | ESE 7 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | NE 6 | S 8 | S 7 | S 10 |
| kJ | 102 | 83 | 96 | 82 | 84 | 92 | 51 | 235 | 50 | 40 | 64 | 51 | 39 | 23 | 14 | 15 | 15 | 13 | 51 | 25 | 51 |
Swell 2 Height (m) Direction Period (s) | S 10 | S 9 | S 8 | E 9 | S 11 | ESE 11 | ESE 10 | S 8 | SE 9 | ENE 5 | E 11 | E 10 | SSW 4 | S 5 | S 5 | SE 4 | S 8 | S 7 | NE 9 | ENE 9 | ENE 8 |
| kJ | 113 | 76 | 49 | 6 | 56 | 100 | 80 | 11 | 81 | 17 | 2 | 2 | 4 | 13 | 8 | 1 | 6 | 9 | 37 | 30 | 28 |
Swell 3 Height (m) Direction Period (s) | ENE 10 | SSW 13 | S 12 | SE 15 | ESE 14 | S 10 | E 5 | E 9 | S 8 | E 11 | S 14 | S 12 | S 11 | SE 7 | SE 7 | — | S 5 | ENE 8 | S 15 | S 12 | S 6 |
| kJ | 10 | 53 | 24 | 9 | 61 | 46 | 20 | 6 | 5 | 2 | 4 | 3 | 2 | 2 | 2 | — | 1 | 7 | 41 | 26 | 7 |
Wind waves Height (m) Direction Period (s) | — | — | — | ESE 7 | ENE 5 | — | — | — | NNE 5 | NE 5 | NNE 4 | — | SW 4 | — | NNE 3 | — | — | — | — | N 3 | NW 2 |
| kJ | — | — | — | 99 | 17 | — | — | — | 64 | 23 | 9 | — | 5 | — | 1 | — | — | — | — | 1 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 3 | 45 | 4 | 31 | 47 | 0 | 0 | 161 | 0 | 0 | 1 | 0 | 7 | 57 | 178 | 253 | 263 | 178 | 2 | 126 | 2 |
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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