Avalon-South surfForecast / NSW – Sydney North Coast / Australia

information circle12 Day Weather and Surf, issued 10 am Thursday 18 Dec 2025 AEDT
Forecast update in hr  min  s Forecast update imminent
Avalon-South surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Avalon-South sea temperature is
22.1° C
(Which is normal for this time of year)


Best Forecast Surf Conditions for Avalon-South this week:

The surf forecast for Avalon-South over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Dec 19) at 5AM. The primary swell is predicted to be 1.4m and 7s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Avalon-South in the next 12 days are 1.9m 7s and forecast to arrive on Thursday (Dec 18) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 10s period and expected on Thursday (Dec 25) at 2PM.

Wave TypeTime (AEDT) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Fri 19th Dec)4.5ft (1.4m) 7s
Best Surf 8PM (Tue 23rd Dec)5.5ft (1.7m) 6s
Most Powerful11PM (Thu 18th Dec)6ft (1.9m) 7s

Table - best surf conditions forecast for Avalon-South over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Warm (max 33°C on Fri morning, min 19°C on Thu morning). Wind will be generally light.

Days 3-6 Weather Summary Light rain (total 3mm), mostly falling on Sun night. Warm (max 30°C on Tue afternoon, min 20°C on Sun night). Winds increasing (calm on Sun morning, fresh winds from the S by Tue night).

Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
1
1
0
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.9
NE
1.4
NE
1.8
NE
1.2
ENE
1.1
NE
1
NE
0.9
NE
0.7
NE
0.8
NE
0.7
NE
1.4
NE
1.1
NE
0.8
NE
1.1
ENE
0.6
NE
0.6
ENE
1.7
NE
1
NE
0.5
NE
0.9
ENE
0.9
ENE
Period(s) (?)657777777777888666645
Wave
Graph
(?)Metric surfscale
Energy kJ (?)47111316142122887351625118111271149382417283192844
Wind
(km/h)
15
NE
25
NE
10
N
0
WSW
15
NNE
5
WNW
5
SE
25
NE
5
SW
5
N
10
E
25
S
10
ESE
20
ENE
10
E
5
NW
10
ENE
20
S
5
NE
20
NE
30
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
cross-
on
crossglasscrossglasscross-
on
cross-
on
glasscrossoncrosscross-
on
ononglassoncrosscross-
on
cross-
on
cross-
off
High Tide
/ height (m)
8:25PM
1.00
8:24AM
1.55
9:05PM
1.01
9:02AM
1.58
9:44PM
1.01
9:39AM
1.59
10:24PM
1.02
10:16AM
1.58
11:04PM
1.02
10:54AM
1.56
11:46PM
1.03
11:32AM
1.52
12:31AM
1.06
Low Tide
/ height (m)
2:37PM
0.26
1:48AM
0.39
3:16PM
0.21
2:26AM
0.38
3:54PM
0.19
3:05AM
0.38
4:32PM
0.18
3:43AM
0.39
5:09PM
0.17
4:22AM
0.41
5:47PM
0.17
5:04AM
0.44
6:25PM
0.17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Sunrise5:39--5:39--5:39--5:39--5:41--5:41--5:41--
Sunset-8:01--8:01--8:02--8:02--8:04--8:04--8:05-
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
rain showers
thunderstorm
part cloud
part cloud
cloud
clear
clear
part cloud
clear
clear
part cloud
Rain (mm)
----------12---------
Temp. °C252724333327252524292824222221283024242622
Feels °C (?)242522333028272424302925222021303126242421
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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 12 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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