Backdoor 4 Surf Break

Lat Long: 33.28° S 151.57° E

Backdoor 4 Surf Forecast and Surf Report

Issued: 9 am 06 Aug 2026 (local time)

Forecast update in  hr  min

Today's Backdoor 4 sea temperature is
17.9° C
0.5° 

Backdoor 4 surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Backdoor 4 surf forecast from 6 Aug 2026:

  • Best quality surf: Friday 7 Aug, 1PM (local time) - 2ft (0.6m), 9s period, S swell with cross-offshore winds.
  • Most powerful swell: Tuesday 11 Aug, 4AM (local time) - 6ft (1.9m), 11s period, S swell with 890 kJ wave energy.
  • Next surfable swell (1★+): Friday 7 Aug, 1PM (local time) - 2ft (0.6m), 9s period with S swell.

Best Forecast Surf Conditions for Backdoor 4 this week:

The surf forecast for Backdoor 4 over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 07) at 1PM. The primary swell is predicted to be 0.5m and 10s period with a secondary swell of 0.6m and 9s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Backdoor 4 in the next 16 days are 1.9m 11s and forecast to arrive on Tuesday (Aug 11) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 8s period and expected on Thursday (Aug 13) at 4PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 1PM (Fri 7th Aug)2ft (0.6m) 9s
Best Surf 1PM (Fri 7th Aug)2ft (0.6m) 9s
Most Powerful 4AM (Tue 11th Aug)6ft (1.9m) 11s

Table - best surf conditions forecast for Backdoor 4 over the next 16 days.


The Lowdown

Right, I’ve had a look at what’s on offer for the next 16 days, and to be honest, the waiting game is on. We’ve got a long stretch of pretty ordinary conditions before a proper window opens up. The first week and a half is mostly a write-off, but there’s a couple of days later on that have some real potential.

The first real glimmer of hope isn’t until Friday the 14th of August. The morning sees a clean 6ft S swell rolling in with a period of 10 seconds, and a gentle cross-offshore breeze. The combined energy is solid at 652 (moderate to strong). The afternoon gets even better, with a 5ft S swell and moderate offshore winds, keeping things clean. This is padding you out nicely.

Then Saturday the 15th of August morning is the standout. It’s a 6ft S swell with a 10-second period, and gentle cross-offshore winds. The combined energy is 646 (moderate to strong). This is the best of the whole run, with clean conditions and a decent amount of push. The afternoon gets a bit windier with a 22 mph offshore, but the morning session is the one to aim for.

After that, conditions drop off again. There’s a bit of a surprise on Thursday the 20th of August, with a 4ft S swell and glassy conditions in the morning. The combined energy is 213 (moderate), and it’s clean. That’s a nice little session. Then Friday the 21st of August morning also looks good, with a 3ft S swell, a 10-second period, and glassy conditions, with energy at 290 (moderate).

The water temperature is sitting at 64°F, which is about 0.9°F cooler than the long-term average for this time of year, so nothing unusual there.

Alright, here’s the breakdown. For the first week, from Thursday the 6th through to Wednesday the 13th, it’s a real struggle. The winds are mostly cross or onshore, and the swell is small and messy. It’s a dead zone, and you’re better off doing something else. The real action starts on Friday the 14th, peaks on Saturday the 15th, and then we get a couple more decent windows on the 20th and 21st.

The standout is Saturday the 15th of August morning at Backdoor 4 (Big Island). The swell is 6ft from the S, with glassy to clean conditions. It’s a very consistent reef break, exposed to the south swell, and the wind is set to be perfect. The combined energy is strong at 646. This is the one to circle on the calendar. Just keep in mind that this spot can get crowded, so get in early.

The second good option is the morning of Friday the 21st of August. Again, Backdoor 4 (Big Island) with a 3ft S swell, glassy conditions, and a 10-second period. The energy is 290 (moderate). It’s not as big, but it’ll be clean and fun.

Remember, the long-range stuff for the 15th and 21st is promising but a bit less certain, so keep an eye on the forecast. For the rest of the time, it’s a write-off, but it’ll turn around.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 15°C on Thu afternoon, min 9°C on Thu night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 5mm), mostly falling on Sun night. Very mild (max 19°C on Tue afternoon, min 9°C on Mon night). Winds decreasing (strong winds from the NW on Sun night, light winds from the WNW by Tue morning).

Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
Tuesday
11
Wednesday
12
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.4
S
10
0.8
S
8
0.7
S
9
0.6
S
9
0.5
SSE
10
0.5
SSE
9
0.6
S
8
0.6
S
8
0.7
E
8
0.9
ENE
9
0.9
ENE
9
1.4
ENE
8
1.3
ENE
9
0.8
ENE
9
1.7
S
10
1.4
S
9
1
S
8
0.8
S
8
0.6
ENE
10
0.6
ENE
10
1.4
WNW
5
Wave Graph
Metric surfscale
Energy kJ
30
91
74
55
55
50
48
40
61
135
143
290
261
108
557
334
135
89
75
74
89
Wind (km/h)
5
WNW
10
ENE
15
NW
10
WNW
15
ESE
10
W
0
NW
20
ENE
20
NNE
15
NNW
20
NE
35
WNW
45
WNW
35
W
15
WNW
15
WNW
10
NNW
15
NNW
30
NNW
35
WNW
40
W
Wind State
cross
cross-on
cross-on
cross
cross-off
cross-off
glassy
cross
on
on
cross-on
cross-on
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross
cross
High Tide
1:51PM1.39m
2:10AM1.03m
2:58PM1.44m
3:35AM0.98m
4:07PM1.52m
4:56AM1.00m
5:11PM1.61m
6:03AM1.06m
6:09PM1.71m
6:59AM1.13m
7:02PM1.78m
7:49AM1.20m
7:50PM1.80m
Low Tide
8:28PM0.44m
8:05AM0.36m
9:51PM0.38m
9:15AM0.39m
11:06PM0.28m
10:26AM0.38m
00:08AM0.16m
11:31AM0.33m
1:02AM0.07m
12:29PM0.27m
1:50AM-0.00m
1:22PM0.22m
2:33AM-0.03m
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
cloud
cloud
rain showers
part cloud
clear
clear
clear
clear
part cloud
light rain
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:41
6:39
6:39
6:37
6:37
6:35
6:35
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:17
5:17
5:19
5:20
5:20
5:21
5:22
 mm
5
1
Temp °C
14
15
13
15
14
14
13
15
14
18
18
16
16
15
11
17
19
13
14
13
13
Feels °C
11
11
8
12
10
12
10
11
10
13
13
11
7
6
6
13
15
8
6
5
4
  • 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 Backdoor 4 Surf forecast

The above surf forecast table for Backdoor 4 provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Backdoor 4 can be found by selecting the local surf guide option on the grey menu. Our Backdoor 4 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 (Backdoor 4) 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 Backdoor 4 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.

Backdoor 4 is 14 km (9 miles) from the city of Catherine Hill Bay. If you plan a holiday in Newcastle, look for hotels and other accommodation in Catherine Hill Bay. Catherine Hill Bay has rooms for a wide range of budgets as well as car hire and transport links.

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