Surf Forecasts:
Avalon-South surf forecast from 10 Sep 2026:
- Best quality surf: Monday 14 Sep, 1AM (local time) - 4.5ft (1.4m), 6s period, NNE swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 1AM (local time) - 6ft (1.8m), 9s period, SSE swell with 493 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 1AM (local time) - 4.5ft (1.4m), 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 1.4m and 6s period with a secondary swell of 1.1m 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 1.8m 9s and forecast to arrive on Wednesday (Sep 16) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.4m 10s period and expected on Thursday (Sep 10) at 7PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Mon 14th Sep) | 4.5ft (1.4m) 6s |
| Best Surf | 1AM (Mon 14th Sep) | 4.5ft (1.4m) 6s |
| Most Powerful | 1AM (Wed 16th Sep) | 6ft (1.8m) 9s |
Table - best surf conditions forecast for Avalon-South over the next 16 days.
The Lowdown
Alright, this is Rusty. Let’s get into it.
Look, I’ve got to be straight with you – for the next week and a half, it's flat-lining around here. You’re looking at a long stretch from Thursday the 10th of September all the way through to Sunday the 20th where there’s just nothing to get excited about. We're talking dribbly, un-rideable mush at Avalon-South, with swell heights barely scraping 2ft and the energy readings mostly below 100 (weak). There’s some clean windows in there, like that glassy Saturday morning the 12th with zero wind, but there’s no power behind it – just a tiny 0.6ft swell with a period of 14 seconds. That’s too long and too small to do anything useful on a beach break; the sets would just roll through without a proper shape.
Things start to get interesting on Sunday the 20th of September. That afternoon, we finally get a pulse of life. A 7ft SSE swell rolls in with an 11-second period, and the combined energy jumps to 867 (strong). The wind is light and cross-off from the SSW, keeping it clean. That’s a solid, punchy groundswell, but for a beginner spot like Avalon-South, 7ft is right on the edge – it’s getting big for the less experienced crew. The water temp is sitting at 65°, which is bang on normal for this time of year, so no surprises there.
Monday the 21st drops off a bit – 5ft SSE in the morning, but the wind swings cross-on from the SE, putting a bit of texture on it. The energy is still moderate at 367, but it’s not the same quality.
Then on Wednesday the 23rd of September, the swell changes direction to the NE. That afternoon we see 7ft at a short 6-second period, with energy up at 407 (moderate to strong). But it’s cross-on wind from the NE, so it’s going to be choppy and messy. That short period windswell won’t have the same grunt or shape as the SSE groundswell earlier.
Honestly, the one true standout in this whole 16-day window is that Sunday the 20th afternoon. That’s the one to circle. Light offshore wind, decent size, and real energy. If you’re an able paddler, that’s where you want to be.
Rusty, signing off.
Short Range ForecastMostly dry. Very mild (max 17°C on Sat morning, min 12°C on Thu morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Tue afternoon. Warm (max 25°C on Mon morning, min 14°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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) | SE 10 | ESE 9 | E 15 | ENE 15 | ENE 14 | ENE 13 | ENE 14 | ENE 14 | ENE 13 | NE 4 | NE 4 | NNE 6 | NE 6 | NE 4 | NE 6 | NE 6 | SSE 5 | SSE 9 | ENE 14 | ENE 12 | ENE 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 25 | 17 | 4 | 21 | 18 | 18 | 19 | 19 | 16 | 6 | 29 | 145 | 24 | 45 | 54 | 29 | 69 | 493 | 20 | 15 | 17 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross-off | cross-on | cross-off | glassy | on | cross-off | cross-on | cross-on | cross-off | cross-off | cross-on | cross-off | cross | cross-on | cross-on | cross-on | on | glassy |
High Tide | 7:32PM1.63m | 8:07AM1.38m | 8:14PM1.58m | 8:45AM1.44m | 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 | ||||||||
Low Tide | 1:14PM0.21m | 2:00AM0.03m | 2:02PM0.17m | 2:35AM0.06m | 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 | ||||||||
 |  |  |  | |  | | | | | | | | | | |  |  | | | | |
 | 6:01 | — | — | 6:00 | — | — | 5:58 | — | — | 5:58 | — | — | 5:56 | — | — | 5:54 | — | — | 5:52 | — | — |
 | — | 5:42 | — | — | 5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — | — | — |
Temp °C | 13 | 15 | 14 | 16 | 16 | 15 | 17 | 17 | 16 | 20 | 19 | 18 | 25 | 23 | 22 | 17 | 16 | 15 | 15 | 15 | 15 |
Feels °C | 9 | 11 | 12 | 14 | 14 | 15 | 15 | 15 | 15 | 17 | 15 | 15 | 21 | 19 | 20 | 15 | 13 | 12 | 12 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 22 | S 10 | S 10 | S 10 | S 10 | S 12 | S 11 | S 10 | S 11 | S 11 | NE 6 | S 11 | S 11 | NE 6 | NE 6 | NE 6 | ENE 6 | S 9 | S 9 | S 11 |
| kJ | 963 | 233 | 967 | 618 | 529 | 384 | 411 | 279 | 194 | 184 | 184 | 82 | 121 | 108 | 54 | 29 | 11 | 3 | 544 | 340 | 332 |
Swell 2 Height (m) Direction Period (s) | SE 10 | ESE 9 | E 15 | ENE 15 | ENE 14 | S 18 | S 19 | S 17 | S 20 | NE 4 | ENE 13 | S 12 | NE 6 | ENE 13 | S 10 | S 10 | S 9 | S 18 | S 16 | ENE 12 | ENE 13 |
| kJ | 25 | 17 | 4 | 21 | 18 | 27 | 184 | 140 | 119 | 4 | 17 | 177 | 24 | 16 | 48 | 29 | 15 | 24 | 21 | 15 | 17 |
Swell 3 Height (m) Direction Period (s) | S 23 | E 9 | E 10 | ENE 15 | E 10 | ENE 13 | ENE 14 | ENE 14 | ENE 13 | S 16 | ENE 13 | ENE 13 | ENE 13 | — | ENE 12 | ENE 13 | ENE 13 | ENE 13 | ENE 14 | NE 5 | NE 7 |
| kJ | 92 | 2 | 2 | 21 | 2 | 18 | 19 | 19 | 16 | 48 | 17 | 17 | 17 | — | 15 | 16 | 17 | 18 | 20 | 1 | 2 |
Wind waves Height (m) Direction Period (s) | — | S 10 | — | — | — | — | — | ENE 3 | NE 4 | NE 4 | NE 4 | NNE 6 | — | NE 4 | WNW 2 | SSW 3 | SSE 5 | SSE 9 | — | — | — |
| kJ | — | 1004 | — | — | — | — | — | 3 | 9 | 6 | 29 | 145 | — | 45 | 1 | 3 | 69 | 493 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 3 | 46 | 2 | 0 | 7 | 2 | 2 | 10 | 2 | 10 | 197 | 0 | 2 | 47 | 0 | 123 | 203 | 45 | 7 | 10 | 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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