Thirroul Surf Break

Lat Long: 34.32° S 150.93° E

Thirroul Surf Forecast and Surf Report

Issued: 3 pm 20 Aug 2026 (local time)

Forecast update in  hr  min

Today's Thirroul sea temperature is
18.1° 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 20 Aug 2026:

  • Best quality surf: Wednesday 26 Aug, 10AM (local time) - 7ft (2.2m), 8s period, S swell with cross-offshore winds.
  • Most powerful swell: Wednesday 26 Aug, 1PM (local time) - 8ft (2.4m), 9s period, S swell with 855 kJ wave energy.
  • Next surfable swell (1★+): Friday 21 Aug, 1AM (local time) - 3ft (0.9m), 6s period with ENE 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 Friday (Aug 21) at 1AM. The primary swell is predicted to be 0.9m and 6s period with a secondary swell of 0.1m and 12s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Thirroul in the next 16 days are 2.4m 9s and forecast to arrive on Wednesday (Aug 26) at 1PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Tuesday (Aug 25) at 4PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 1AM (Fri 21st Aug)3ft (0.9m) 6s
Best Surf10AM (Wed 26th Aug)7ft (2.2m) 8s
Most Powerful 1PM (Wed 26th Aug)8ft (2.4m) 9s

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


The Lowdown

Alright, folks. Rusty here with the lowdown for the next sixteen days at Thirroul. It’s a slow start, so don’t bother waxing up just yet. The first real surf worth paddling for doesn’t show until Sunday morning, August 23rd, so you’ve got a few days of flat or tiny dribble to sit through.

The water temp is 65°, which is right on the money for this time of year. Nothing special.

Let’s get into it. Sunday morning, August 23rd, we see a little pulse of life. A south swell pushing 3 feet at 10 seconds, with clean glassy conditions. The combined energy is moderate, around 150, and while the size is small, it’s surfable. Monday the 24th keeps that energy rolling with a similar south swell, 3 feet, and clean cross-off winds in the morning. It’s not going to blow your mind, but it’s a start.

The standout window is Wednesday, August 26th. That morning, a south swell builds to 7 feet with a period of 8 seconds. The energy jumps to a strong 727, and we’ve got clean cross-off winds. This is proper size for Thirroul. For the experienced crew, this is your call. The afternoon sees the swell hold at 7 feet, but the energy cranks right up to a very strong 1171. The wind picks up to a moderate cross-off, so it’ll be a bit wild, but still clean. Nothing for beginners here – 7 feet is past the comfort zone for learners.

The next morning, Thursday the 27th, the swell backs off to 3 feet, but the energy is still moderate at 162. It’s a drop-off, but still a fun little leftover.

After that, the surf gets messy and inconsistent. Saturday, August 29th, has a 6-foot north-east swell in the morning, but the wind is a moderate cross-off. The energy is moderate at 399. It’s a bit of a novelty, but the quality is ordinary. The following week is a real mixed bag of tiny, choppy, or onshore conditions. There’s a brief moment on September 1st with a glassy 3 feet, but it’s small and weak. The long-range looks poor overall, with only a few marginal windows.

If you’re waiting for the best, point your board at Wednesday, August 26th. That south swell, with clean wind and serious energy, is the pick of the whole period. The rest of the week is a waiting game. Keep your eyes on the forecast, though – the consistency here is fairly decent, so it won’t stay this quiet forever.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Thu afternoon. Warm (max 21°C on Fri morning, min 11°C on Fri night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 29mm), heaviest during Wed morning. Warm (max 21°C on Mon morning, min 12°C on Sun night). Wind will be generally light.

Thu
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
1
1
1
0
0
0
0
1
0
2
1
0
1
0
0
2
3
3
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.7
NE
6
0.9
ENE
6
0.8
ENE
7
0.8
NE
6
0.4
ENE
6
0.4
S
5
0.3
S
8
0.2
S
11
0.8
S
10
0.6
S
11
0.9
S
10
0.8
S
10
0.7
S
10
0.6
S
9
0.6
S
9
0.8
ENE
6
1.4
S
6
2.2
S
8
2.1
S
9
1
SSE
7
Wave Graph
Metric surfscale
Energy kJ
34
64
50
56
15
7
12
9
118
94
154
122
96
63
59
45
130
675
640
93
Wind (km/h)
15
NNE
5
WNW
5
WNW
5
NW
15
W
15
W
5
SSE
10
WSW
5
SSE
15
ENE
10
NNW
10
N
20
NE
5
WNW
15
N
20
NNW
10
NW
15
WSW
25
WSW
15
WSW
Wind State
cross
off
off
off
cross-off
cross-off
glassy
cross-off
glassy
cross-on
cross-off
cross-off
cross
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
2:26AM0.86m
2:55PM1.25m
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
Low Tide
8:49PM0.50m
7:53AM0.53m
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
light rain
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
part cloud
light rain
light rain
mod rain
heavy rain
light rain
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:30
6:28
6:26
6:26
6:24
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:28
5:29
5:30
5:30
5:30
5:31
5:32
 mm
1
1
2
8
18
3
Temp °C
20
16
21
20
15
19
18
13
16
17
15
21
19
15
18
17
16
13
13
12
Feels °C
18
15
20
18
11
17
16
10
14
15
14
18
16
15
14
15
15
11
8
7
  • Map Icons:
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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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