Thirroul Surf Break

Lat Long: 34.32° S 150.93° E

Thirroul Surf Forecast and Surf Report

Issued: 3 pm 21 Aug 2026 (local time)

Forecast update in  hr  min

Today's Thirroul sea temperature is
18.0° C
0.7° 

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


Thirroul surf forecast from 21 Aug 2026:

  • Best quality surf: Sunday 23 Aug, 4AM (local time) - 4ft (1.2m), 11s period, S swell with glassy winds.
  • Most powerful swell: Sunday 23 Aug, 4AM (local time) - 4ft (1.2m), 11s period, S swell with 332 kJ wave energy.
  • Next surfable swell (1★+): Sunday 23 Aug, 1AM (local time) - 2ft (0.6m), 11s period with S swell.

Best Forecast Surf Conditions for Thirroul this week:

The surf forecast for Thirroul over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 23) at 1AM. The primary swell is predicted to be 0.6m and 11s period with a secondary swell of 0.4m and 4s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Thirroul in the next 16 days are 1.2m 11s and forecast to arrive on Sunday (Aug 23) at 4AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Friday (Aug 21) at 10PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 1AM (Sun 23rd Aug)2ft (0.6m) 11s
Best Surf 4AM (Sun 23rd Aug)4ft (1.2m) 11s
Most Powerful 4AM (Sun 23rd Aug)4ft (1.2m) 11s

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


The Lowdown

G’day, I’m Rusty. Look, I’ll be straight with you – this 16-day window for Thirroul is a bit of a mixed bag. We’re looking at a lot of small, ordinary days, but a couple of windows pop where things come together nicely if you’re patient. The wave energy is mostly moderate, with combined energy values in the low to mid hundreds – nothing massive, but enough to work with. The water temp is sitting around 64°, which is about normal for this time of year, no big surprises there.

First, we get through a rough patch. Friday 21 August afternoon is glassy with a tiny 2ft swell from the ENE at 6 seconds, but it’s poor surf – energy is weak at 38, nothing to bother with. Saturday 22 August is a write-off with tiny 1ft waves both morning and afternoon; morning has a WSW cross-offshore wind at 12 mph, but the swell is too small. Sunday 23 August morning shows some promise: a bit of a bump with 4ft from the S at 8 seconds, combined energy of 220, and glassy conditions with a NNW cross-offshore wind at 3 mph. That’s clean, but the swell is short-period and ordinary. Not a standout.

Monday 24 August and Tuesday 25 August are forgettable – small 2ft to 4ft, mostly cross-off winds but poor surf quality. Wednesday 26 August morning is clean with 4ft from the ENE at 8 seconds (energy 180), but it’s just surfable. Thursday 27 August morning is glassy again with 3ft ENE at 8 seconds (energy 153), but still ordinary.

Now, here’s the first real standout. Sunday 30 August morning at Thirroul is glassy calm – zero wind, and 2ft from the ENE at 8 seconds. The energy is only 84, weak, so it’s small, but it’s clean. Not a big day, but the clean conditions make it worth a look if you’re desperate for a glassy session.

Then we hit the best part of the window. Monday 31 August morning: the swell jumps to 2ft, but look at the period – a very long 17 seconds from the SSE, with combined energy of 346 – that’s solid moderate energy. Winds are light N at 6 mph, cross-offshore, so it’s clean. That long-period groundswell is best suited for a point or reef, and Thirroul is a beach and reef setup. It might break a bit straight on the beach, but the reef section could shape it up nicely. This is the top pick of the whole 16 days.

Tuesday 1 September morning keeps the run going: 3ft from the S at 11 seconds (energy 217) with a light SW cross-offshore wind at 6 mph – again, clean and decent conditions. Not as standout as the Monday, but solid.

After that, from Wednesday 2 September through to Saturday 5 September, it’s back to small, ordinary surf with energy in the low hundreds and mostly cross-off winds but poor quality. Saturday 5 September morning has a solid 16 mph W offshore wind with 3ft from the S at 9 seconds (energy 165), but it’s just surfable – the wind is strong, so it’ll be clean but blown-out in the face.

Overall, the best on offer is Monday 31 August morning, with the long 17-second groundswell and clean conditions – that’s the one to circle on the calendar. Sunday 30 August morning is a close runner-up for a glassy small-wave session.

Stay patient, and keep an eye on that Monday. Rusty.

Short Range Forecast

Light rain (total 3mm), mostly falling on Sat night. Warm (max 21°C on Fri afternoon, min 12°C on Fri night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 7mm), mostly falling on Tue afternoon. Warm (max 22°C on Tue morning, min 11°C on Wed night). Wind will be generally light.

Fri
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
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
2
0
1
1
0
1
0
0
2
1
0
1
1
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.7
ENE
6
0.5
NE
6
0.3
NE
6
0.3
S
8
0.6
S
11
1.1
S
8
0.8
S
11
0.9
S
10
0.8
S
10
0.6
S
10
0.9
ENE
6
1.1
NE
6
0.8
ENE
6
1.4
ENE
8
1.2
ENE
8
0.9
ENE
8
0.8
ENE
8
0.9
ENE
8
0.9
ENE
8
0.9
ENE
8
Wave Graph
Metric surfscale
Energy kJ
36
19
6
12
89
165
166
164
122
67
67
80
54
213
162
109
78
105
113
111
Wind (km/h)
5
WSW
15
W
15
WSW
10
SE
0
SW
5
N
15
NNE
10
NNW
10
N
20
NE
10
NNW
20
N
20
NNW
10
WNW
15
SW
15
SE
10
WSW
5
NNE
15
ENE
10
NW
Wind State
glassy
off
cross-off
cross-on
glassy
cross-off
cross
cross-off
cross-off
cross
cross-off
cross-off
cross-off
off
cross-off
on
cross-off
glassy
cross-on
off
High Tide
3:47AM0.84m
4:00PM1.27m
4:57AM0.87m
4:57PM1.32m
5:49AM0.92m
5:45PM1.38m
6:31AM0.99m
6:26PM1.45m
7:08AM1.06m
7:04PM1.50m
7:42AM1.13m
7:41PM1.53m
Low Tide
10:06PM0.48m
9:01AM0.55m
11:09PM0.43m
10:09AM0.54m
11:58PM0.37m
11:07AM0.49m
00:37AM0.30m
11:56AM0.43m
1:12AM0.23m
12:39PM0.37m
1:44AM0.17m
1:19PM0.32m
2:15AM0.13m
clear
clear
clear
clear
rain showers
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
light rain
light rain
part cloud
part cloud
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:28
6:26
6:26
6:24
6:22
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:29
5:30
5:30
5:30
5:31
5:32
5:32
 mm
3
5
2
Temp °C
21
15
19
18
13
16
17
13
21
19
16
22
17
16
17
15
13
17
16
12
Feels °C
19
11
17
15
12
13
14
11
18
16
16
19
14
15
15
13
12
14
13
11
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  • 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 Thirroul Surf forecast

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

Are you planning a holiday in Illawarra? If you are looking for accommodation near Thirroul, camping, hotels and holiday cottages in Illawarra, consider staying in Wollongong which is 12 km (7 miles) away. Other places in and around Illawarra where you can find information about places to rent, and car hire include Port Kembla which is 19 km (12 miles) away, Engadine, Cronulla and Caringbah.

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