Thirroul Surf Break

Lat Long: 34.32° S 150.93° E

Thirroul Surf Forecast and Surf Report

Issued: 9 am 12 Aug 2026 (local time)

Forecast update in  hr  min

Today's Thirroul sea temperature is
17.6° C
0.1° 

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


Thirroul surf forecast from 12 Aug 2026:

  • Best quality surf: Thursday 13 Aug, 7PM (local time) - 4ft (1.2m), 8s period, S swell with glassy winds.
  • Most powerful swell: Saturday 15 Aug, 1PM (local time) - 5.5ft (1.7m), 7s period, S swell with 320 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 12 Aug, 7PM (local time) - 2.5ft (0.7m), 8s 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 Wednesday (Aug 12) at 7PM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.5m and 10s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Thirroul in the next 16 days are 1.7m 7s and forecast to arrive on Saturday (Aug 15) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Wednesday (Aug 12) at 10PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 7PM (Wed 12th Aug)2.5ft (0.7m) 8s
Best Surf 7PM (Thu 13th Aug)4ft (1.2m) 8s
Most Powerful 1PM (Sat 15th Aug)5.5ft (1.7m) 7s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what’s on the menu for Thirroul over the next couple of weeks.

It’s a pretty quiet start, to be honest. We’ve got a few days of clean-ish but weak surf coming up, but nothing that’ll get the heart racing. The real standout sits way out at the end of the forecast window, so we’ve got some patience to exercise.

The first proper session worth paddling out for hits on Wednesday morning, August 12th. We’re looking at a 3ft swell from the south, with a period of 9 seconds. The wind is light offshore from the west at 9 mph, so the surface will be clean. The water is sitting at 64°, which is pretty normal for this time of year. Combined wave energy is moderate (218). It’s surfable, but it’s nothing to write home about.

Thursday morning, August 13th, offers similar 3ft south swell, but the wind is cross-offshore from the WSW at 6 mph, so it’s still clean. The energy is a bit lower (168). Again, it’s okay, but very ordinary.

Friday morning, August 14th, is worth a mention. The swell is 3ft from the south, period 8 seconds, and the wind goes glassy – dead calm. That’s a major positive for clean waves. The energy is moderate (194). It’s a small day, but if you’re a local who loves a grovel, this is your window.

Now, from Saturday the 15th right through to the morning of Thursday the 20th, it’s a write-off. We’ve got onshore winds, wind chop, and mixed-up swell directions. The energy drops off a cliff, and the conditions are just poor. There’s a gap of about 5 days where you’re better off doing something else.

Things start to look a little better again on Friday morning, August 21st. A 3ft swell from the ENE, period 8 seconds, with offshore wind from the west at 6 mph. Energy is low (112) but the conditions are clean. It’s small, but it’s tidy.

The best of the whole forecast is on Sunday, August 23rd. Both morning and afternoon are good. The swell is 3ft from the ENE, but the period stretches to 11 seconds, giving it a bit more push. The wind is offshore from the WNW for the morning (6 mph) and from the west for the afternoon (9 mph). Combined wave energy is solid (226 morning, 225 afternoon). This is a clean, fun, small-wave day. The period is long enough that at a beach-and-reef setup like Thirroul, the waves should have a nice shape. It’s a standout for the consistency and quality of conditions.

Monday morning, August 24th, is also glassy with a 3ft ENE swell (10-second period, energy 199), but the afternoon gets chopped up by a NE wind. Tuesday the 25th sees offshore winds again, but the swell is smaller and the energy is fading.

The big one – the one for the experienced crew – is on Thursday, August 27th. The morning session is a flat-out highlight. Swell is 8ft from the south, period 9 seconds, and the wind is glassy. The combined wave energy is massive (1177). This is a powerful south swell, and with it being glassy? That’s a rare combination. The swell is over 8ft, so this is for experts only. The afternoon jumps to 10ft from the same direction, but the wind turns onshore from the ESE, which might make it a bit of a beast. But that Thursday morning is the one to circle on the calendar – just don’t send the beginners out.

So, to wrap it up: wait through the junk this week, enjoy the clean but small days on Friday the 21st and the weekend of the 23rd, and then get ready for a serious session on the morning of Thursday, August 27th.

Rusty.

Short Range Forecast

Light rain (total 4mm), mostly falling on Fri night. Very mild (max 18°C on Wed morning, min 8°C on Thu night). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 24mm), heaviest during Sat night. Very mild (max 15°C on Sat morning, min 11°C on Sat night). Wind will be generally light.

Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
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)
1
S
9
0.8
S
9
0.7
S
8
1
S
8
1.3
S
8
0.9
S
7
1
S
8
0.9
SSE
7
0.8
SSE
7
1.6
S
8
1.6
S
7
1.2
S
7
1.5
SSE
6
1.3
SSE
6
1.6
SE
7
1.5
ESE
7
1.3
ESE
6
1.4
ESE
6
0.9
ESE
6
0.8
ESE
6
0.8
E
6
Wave Graph
Metric surfscale
Energy kJ
166
93
63
133
228
86
136
89
50
300
262
130
164
136
230
195
147
139
68
51
48
Wind (km/h)
15
W
20
W
20
W
10
WSW
10
ESE
15
W
0
WSW
10
ESE
10
SSW
20
S
20
S
15
SSW
20
SSE
20
SE
20
SE
20
ESE
20
ESE
15
ESE
10
S
10
SSE
5
WSW
Wind State
off
cross-off
cross-off
cross-off
on
cross-off
glassy
on
cross
cross
cross-on
cross
cross-on
cross-on
on
on
on
on
cross-on
cross-on
glassy
High Tide
7:50PM1.75m
8:36AM1.23m
8:37PM1.72m
9:19AM1.29m
9:21PM1.63m
10:01AM1.32m
10:04PM1.51m
10:42AM1.34m
10:47PM1.35m
11:24AM1.34m
11:31PM1.20m
12:07PM1.32m
00:18AM1.05m
Low Tide
1:23PM0.23m
2:34AM-0.04m
2:14PM0.20m
3:15AM-0.02m
3:03PM0.20m
3:53AM0.03m
3:52PM0.23m
4:29AM0.10m
4:42PM0.28m
5:04AM0.20m
5:34PM0.35m
5:39AM0.29m
6:30PM0.42m
part cloud
clear
clear
clear
clear
clear
clear
clear
rain showers
rain showers
clear
rain showers
light rain
rain showers
rain showers
rain showers
rain showers
rain showers
clear
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:39
6:39
6:37
6:35
6:35
6:33
6:33
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:22
5:22
5:23
5:24
5:25
5:25
5:27
 mm
4
1
4
1
1
6
3
3
5
1
2
Temp °C
18
17
13
17
16
11
16
15
14
15
15
14
15
15
14
15
15
14
16
15
14
Feels °C
14
12
8
13
14
7
13
12
13
9
10
10
11
11
10
11
11
11
14
13
14
  • 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 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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