Surf Forecasts:
Narrabeen-Alley Rights surf forecast from 20 Aug 2026:
- Best quality surf: Thursday 20 Aug, 10PM (local time) - 5ft (1.6m), 6s period, NE swell with offshore winds.
- Most powerful swell: Thursday 20 Aug, 10PM (local time) - 5ft (1.6m), 6s period, NE swell with 182 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 7PM (local time) - 4.5ft (1.3m), 6s period with ENE swell.
Best Forecast Surf Conditions for Narrabeen-Alley Rights this week:
The surf forecast for Narrabeen-Alley Rights over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 7PM. The primary swell is predicted to be 1.3m and 6s period with a secondary swell of 0.1m and 8s. Another secondary swell of 0.1m and 10s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Narrabeen-Alley Rights in the next 16 days are 1.6m 6s and forecast to arrive on Thursday (Aug 20) at 10PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 9s period and expected on Sunday (Aug 23) at 1PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Thu 20th Aug) | 4.5ft (1.3m) 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 Narrabeen-Alley Rights over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s talk about the next couple of weeks at Narrabeen-Alley Rights. This is a classic beach/sandbar setup, open to the ocean, and it likes swell from the ENE best. Water’s around 63°F, pretty normal for this time of year.
We’ve got a dry spell to start. The first session worth getting wet for doesn’t show up until Sunday, 30 August. Before that, it’s mostly tiny waves, weak energy, and funky winds. Friday the 21st of August has a clean morning with a 0.8ft ENE swell and offshore wind, but the energy is only 79—barely a ripple. You’ll find glassy mornings on the weekend, but the swell’s so small it’s not worth the wetsuit. Nothing to get excited about.
Sunday, 30 August is the change. Morning brings 7ft NE swell with a clean cross-off breeze from the north and energy climbing to 440. That’s a real pulse. Afternoon pushes it to 8ft NE, energy at 689, even cleaner. It’s getting big enough that beginners should stay ashore, but for intermediate-to-advanced surfers, this is the first proper window.
Monday, 31 August is the one to circle. Morning dishes up 8ft of ENE swell—right on the money direction-wise—with 8-second periods and energy at 828. The cross-off wind keeps it clean. This is quality. The afternoon goes nuclear: 12ft ENE, 9-second period, energy blasting 2863. That’s too big for this break. The forecast says it’s predicted to be too big, and with a beach/sandbar setup, it’ll be a freight train. Only the elite crew will be out. Crowds are “often” here, so you’ll see a few of the locals trying to tame it.
Tuesday, 1 September morning is even bigger—13ft ENE, 10-second periods, energy at 4457. That’s a massive groundswell. Wind is offshore from the west, so the faces will be clean, but long-period swell like this can make a beach break close out hard. Experts only. The afternoon turns onshore and gets messy.
The swell fades after that. Thursday, 3 September offers a last decent session with 5ft ENE, clean cross-off wind, and energy at 421—fun but not firing. By Friday, 4 September, it’s back to small and weak.
Best bet in the whole window? Monday, 31 August morning. Right size, right direction, clean, and the break is consistent enough to handle it. The afternoon is for the brave. Sunday the 30th is your warm-up. The rest is either flat, blown out, or just too damn big.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Thu morning, min 12°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 29mm), heaviest during Tue afternoon. Warm (max 22°C on Mon morning, min 11°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
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) | ENE 6 | NE 6 | ENE 6 | ENE 6 | NE 6 | ENE 6 | SSW 5 | NE 6 | SSE 5 | NE 9 | ENE 4 | NE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 9 | ENE 9 | ENE 8 | NE 8 | SSE 6 | SSE 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 40 | 72 | 126 | 51 | 39 | 14 | 19 | 9 | 15 | 38 | 15 | 45 | 34 | 59 | 36 | 106 | 101 | 88 | 95 | 119 | 53 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | off | off | off | off | glassy | cross-on | cross-off | glassy | cross | cross-off | off | glassy | cross-off | cross-on | glassy | cross | cross | cross | cross-off |
High Tide | 1:50PM1.27m | 2:20AM0.87m | 2:55PM1.26m | 3:43AM0.85m | 4:00PM1.28m | 4:55AM0.88m | 4:58PM1.34m | 5:48AM0.93m | 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 | 7 | 14 | 7 | 2 | — | — |
Temp °C | 20 | 19 | 20 | 20 | 20 | 16 | 18 | 17 | 16 | 16 | 16 | 16 | 22 | 22 | 19 | 13 | 14 | 14 | 12 | 13 | 12 |
Feels °C | 17 | 16 | 17 | 17 | 15 | 13 | 16 | 14 | 15 | 13 | 13 | 14 | 20 | 21 | 17 | 14 | 12 | 13 | 6 | 7 | 8 |
Swell 1 Height (m) Direction Period (s) | ENE 6 | SE 7 | ENE 6 | ENE 6 | NE 6 | ENE 6 | SSW 5 | S 6 | SSE 5 | S 9 | S 8 | S 7 | ENE 6 | S 9 | ENE 6 | ENE 9 | ENE 9 | ENE 8 | NE 8 | SSE 6 | SSE 6 |
| kJ | 40 | 23 | 126 | 51 | 39 | 14 | 9 | 21 | 7 | 85 | 66 | 23 | 34 | 62 | 36 | 106 | 101 | 88 | 95 | 119 | 53 |
Swell 2 Height (m) Direction Period (s) | ESE 6 | E 10 | S 12 | S 11 | SE 7 | S 10 | NE 6 | NE 6 | NE 6 | NE 6 | S 15 | S 10 | S 9 | S 16 | S 10 | S 9 | S 9 | S 8 | S 16 | NE 8 | ENE 8 |
| kJ | 37 | 2 | 3 | 2 | 2 | 2 | 9 | 9 | 5 | 10 | 39 | 53 | 61 | 21 | 65 | 61 | 39 | 12 | 19 | 64 | 43 |
Swell 3 Height (m) Direction Period (s) | E 11 | — | S 13 | — | S 11 | E 9 | S 9 | S 9 | ENE 3 | ENE 9 | E 14 | NE 8 | NE 8 | E 13 | ENE 9 | S 16 | S 16 | S 16 | — | S 11 | S 10 |
| kJ | 2 | — | 3 | — | 2 | 2 | 6 | 6 | 1 | 7 | 4 | 18 | 15 | 3 | 31 | 21 | 21 | 20 | — | 10 | 8 |
Wind waves Height (m) Direction Period (s) | NE 6 | NE 6 | — | NW 2 | NW 3 | NW 3 | SSW 5 | ENE 2 | SSE 5 | NE 9 | ENE 4 | NE 5 | — | ENE 6 | WSW 3 | — | — | S 5 | S 6 | — | — |
| kJ | 69 | 72 | — | 1 | 4 | 3 | 19 | 1 | 15 | 38 | 15 | 45 | — | 59 | 1 | — | — | 61 | 86 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 57 | 0 | 0 | 1 | 186 | 114 | 392 | 234 | 0 | 51 | 0 | 1 | 0 | 0 | 2 | 0 | 2 | 195 | 2 | 0 |
Best forecast wave conditions in Sydney North Coast | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Narrabeen-Alley Rights Surf forecast
The above surf forecast table for Narrabeen-Alley Rights provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Narrabeen-Alley Rights can be found by selecting the local surf guide option on the grey menu. Our Narrabeen-Alley Rights 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 (Narrabeen-Alley Rights) 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 Narrabeen-Alley Rights 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.
Narrabeen-Alley Rights is 5 km (3 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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