Thirroul Surf Break

Lat Long: 34.32° S 150.93° E

Thirroul Surf Forecast and Surf Report

Issued: 3 pm 15 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 15 Aug 2026:

  • Best quality surf: Saturday 15 Aug, 10PM (local time) - 4.5ft (1.3m), 7s period, S swell with cross-offshore winds.
  • Most powerful swell: Sunday 16 Aug, 10AM (local time) - 5ft (1.5m), 6s period, SE swell with 172 kJ wave energy.
  • Next surfable swell (1★+): Saturday 15 Aug, 10PM (local time) - 4.5ft (1.3m), 7s 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 Saturday (Aug 15) at 10PM. The primary swell is predicted to be 1.3m and 7s period with a secondary swell of 1.1m and 7s. Another secondary swell of 0.3m and 18s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Thirroul in the next 16 days are 1.5m 6s and forecast to arrive on Sunday (Aug 16) at 10AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Saturday (Aug 22) at 4PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Sat 15th Aug)4.5ft (1.3m) 7s
Best Surf10PM (Sat 15th Aug)4.5ft (1.3m) 7s
Most Powerful10AM (Sun 16th Aug)5ft (1.5m) 6s

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


The Lowdown

G’day, Rusty here. Let’s be straight – this outlook for Thirroul is a slow burner. We’ve got a long stretch of small, messy, or flat days before a big, late burst of size and quality. Don’t get your hopes up for the first week, but the end of the run looks like it could be a cracker for those who can handle it.

Right now, from Saturday 15 August through to Friday 22 August, it’s pretty grim. We’re looking at weak, short-period slop from the SSE and SE, mostly under 3ft and with cross-onshore winds. The combined swell energy is in the weak range (values between 30 and 286), and the water temp is sitting around 64°F, which is about average for the time of year. There’s nothing worth paddling out for – save your energy.

Then on Wednesday 19 August morning, there’s a brief flicker of hope. Glassy conditions with light offshore and a tiny 2ft ESE swell. It’s surfable, but honestly, it’s pretty ordinary. Thursday 20 August morning cleans up a touch with a light cross-offshore breeze and 3ft from the ESE, but the period is short at 6 seconds, so don’t expect much push. Still, the morning is clean.

Friday 21 August afternoon is another small window: 3ft from the ENE, light offshore W winds, clean conditions. Again, it’s small, but if you’re desperate, you’d get a few. The energy’s still low (81).

The real story starts Wednesday 26 August. We get a jump to 12ft from the S with a 9-second period, but the cross-onshore wind chops it up. The combined swell energy jumps into the moderate range at 3233, but the conditions are marginal. This is not a day for beginners – 12ft is getting heavy.

Thursday 27 August morning is a standout for experts. Swell hits 16ft from the S with a period of 12 seconds, giving it proper groundswell power. Combined energy is strong at 11573. The wind is light and cross-shore, so the sea surface is manageable. But at 16ft, this is only for experienced surfers.

The absolute pick of the entire forecast is Friday 28 August morning. We’ve got 16ft from the SSE, a 13-second period (very long period groundswell), glassy conditions with light offshore from the NNE, and combined energy of a massive 13869. This is exceptional – but only for experts. At this size, the break will be heavy and powerful. The long period means the sets will be clean and the paddling easier between bombs, but it’s no place for the faint-hearted. Crowds are sometimes an issue here, so expect company. The swell direction (SSE) matches the optimum direction (SE) closely enough to work well at this beach and reef setup.

After that, Saturday 29 August sees size drop to 8-10ft from the SSE, still with clean morning winds, but the energy is dropping. Sunday 30 August fades to 6-6ft from the SE with onshore winds and weaker energy (613-730). The run is over.

So, to sum it up: a whole lot of nothing until the last few days. The real standout is Friday 28 August morning – that’s the one to circle on the calendar, but it’s for experts only. Everything else is a skip.

Stay salty,
Rusty

Short Range Forecast

Moderate rain (total 13mm), heaviest on Sat night. Very mild (max 16°C on Tue morning, min 10°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 4mm), mostly falling on Tue night. Warm (max 21°C on Thu morning, min 12°C on Tue night). Wind will be generally light.

Sat
15
Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
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
0
0
0
0
0
0
0
0
0
1
0
1
1
0
1
0
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.4
SSE
7
1
S
6
1.5
SE
6
0.8
S
11
0.8
S
10
0.7
S
9
0.8
ESE
7
1.1
ESE
6
0.5
S
11
0.4
ESE
13
1
SE
7
1
ESE
6
0.6
ESE
10
1
ESE
6
0.9
ESE
6
0.8
E
7
0.9
ENE
6
0.9
ENE
7
0.9
ENE
7
0.7
NE
7
Wave Graph
Metric surfscale
Energy kJ
203
81
172
151
122
79
56
82
55
59
102
82
72
90
68
56
64
86
75
56
Wind (km/h)
20
S
10
SW
15
SE
10
SE
10
SE
10
SE
15
SE
15
ESE
10
ESE
10
ESE
10
NNE
0
NE
15
NE
10
NW
10
N
15
NE
10
WNW
15
NNW
10
WNW
5
NW
Wind State
cross-on
cross-off
on
cross-on
cross-on
cross-on
cross-on
on
on
on
cross
glassy
cross-on
off
cross-off
cross
off
cross-off
off
cross-off
High Tide
10:04PM1.51m
10:42AM1.34m
10:47PM1.35m
11:24AM1.34m
11:31PM1.20m
12:07PM1.32m
00:18AM1.05m
12:56PM1.29m
1:14AM0.93m
1:51PM1.26m
2:26AM0.86m
2:55PM1.25m
3:47AM0.84m
Low Tide
4:29AM0.10m
4:42PM0.28m
5:04AM0.20m
5:34PM0.35m
5:39AM0.29m
6:30PM0.42m
6:15AM0.39m
7:35PM0.47m
6:58AM0.47m
8:49PM0.50m
7:53AM0.53m
10:06PM0.48m
clear
rain showers
light rain
part cloud
cloud
light rain
rain showers
mod rain
part cloud
cloud
rain showers
rain showers
clear
clear
clear
part cloud
cloud
cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:35
6:33
6:33
6:31
6:31
6:30
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:24
5:25
5:25
5:27
5:28
5:28
5:29
 mm
4
1
1
1
6
3
1
Temp °C
15
13
15
15
14
15
15
14
16
16
14
17
17
14
21
18
16
20
20
14
Feels °C
11
10
12
12
11
12
11
12
14
14
12
15
14
13
17
15
16
15
17
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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