Thirroul Surf Break

Lat Long: 34.32° S 150.93° E

Thirroul Surf Forecast and Surf Report

Issued: 9 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: Sunday 23 Aug, 1AM (local time) - 8ft (2.5m), 9s period, S swell with cross-offshore winds.
  • Most powerful swell: Sunday 23 Aug, 4AM (local time) - 8ft (2.5m), 9s period, S swell with 1,080 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 18 Aug, 7AM (local time) - 1.5ft (0.5m), 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 Tuesday (Aug 18) at 7AM. The primary swell is predicted to be 0.9m and 6s period with a secondary swell of 0.5m and 11s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Thirroul in the next 16 days are 2.5m 9s and forecast to arrive on Sunday (Aug 23) at 4AM. Winds are predicted to be offshore 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+) 7AM (Tue 18th Aug)1.5ft (0.5m) 11s
Best Surf 1AM (Sun 23rd Aug)8ft (2.5m) 9s
Most Powerful 4AM (Sun 23rd Aug)8ft (2.5m) 9s

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


The Lowdown

Alright folks, Rusty here, looking over the surf forecast for Thirroul for the next couple of weeks. The first week or so is looking pretty flat and messy, but there’s a real cracker of a day waiting for us if we’re patient.

From Sunday the 16th of August through the end of the week, it’s just not happening. Tiny, weak swell is getting chopped up by cross-onshore breezes. The wave energy is pitiful, only about 226 (combined energy of all swells directed here) on Sunday morning, and it gets weaker from there. You’d be wasting your time paddling out.

We see a tiny break on Tuesday the 18th morning. It’s glassy with a light wind, but the swell is only 2 feet from the south. The energy is weak at 115 (combined energy of all swells directed here). Surfable if you’re desperate, but very ordinary. Wednesday morning the 19th is similar, with 2-foot swell and clean conditions, but still nothing to write home about. This pattern of small, weak, and only marginally clean waves hangs on all the way to Saturday the 22nd. It’s a long quiet spell.

Now, here’s the one you’ve been waiting for. The standout day is Sunday the 23rd of August. The morning sees a solid 8-foot south swell rolling in, with clean surf and a light cross-offshore breeze from the NNW. This is excellent for experienced surfers. The wave energy is massive, hitting 1616 (combined energy of all swells directed here). That’s a real pulse of power. The period is 9 seconds, so it’s not that long-period groundswell that can straighten out, but with that size and clean conditions, Thirroul should be firing. It’s too big for beginners, but for the rest of us, this is the session to chase. The afternoon gets messy with a NE wind, so make sure you’re on it first thing.

Monday the 24th and Tuesday the 25th mornings still have some good leftover swell. Monday offers clean 4-foot waves with a light offshore wind, and Tuesday morning is glassy with 6-foot south swell. Good fun, but that Sunday morning is the peak.

After that, the wind really starts howling from Wednesday the 26th. We get strong cross-offshore winds keeping the surface clean, with 5-foot south swell on Wednesday, but the strong breeze makes everything a bit marginal. The energy is still strong at around 600 (combined energy of all swells directed here), but the quality isn’t the same. The following days fade back into smaller, more ordinary surf.

In short, save your energy for the first part of the week. The big call is the morning of Sunday the 23rd of August. That 8-foot south swell with clean conditions is the real standout. Get out there early.

Rusty.

Short Range Forecast

Heavy rain (total 23mm), heaviest during Mon night. Very mild (max 16°C on Mon morning, min 11°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 7mm), mostly falling on Fri morning. Warm (max 20°C on Thu morning, min 11°C on Wed night). Wind will be generally light.

Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
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
0
0
0
1
0
1
1
0
1
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)
1.1
S
6
1.3
ESE
6
0.8
S
11
0.8
S
10
0.7
S
9
0.9
ESE
6
1
ESE
6
0.5
S
11
0.9
ESE
6
0.9
ESE
7
1
ESE
6
0.6
ESE
10
0.9
ESE
9
0.8
ESE
6
0.7
ESE
6
0.8
ENE
6
0.9
ENE
7
0.8
ENE
7
0.7
NE
6
Wave Graph
Metric surfscale
Energy kJ
98
126
151
122
81
60
75
55
60
75
82
72
111
53
40
46
82
51
40
Wind (km/h)
15
SSW
15
ESE
15
SE
10
SSE
15
SE
15
SE
15
ESE
5
ENE
10
ESE
5
NW
5
N
15
NNE
10
NNW
10
NNW
5
NNE
5
WSW
0
NNW
20
NNW
15
W
Wind State
cross
on
cross-on
cross-on
cross-on
cross-on
on
glassy
on
glassy
cross-off
cross
cross-off
cross-off
cross
cross-off
glassy
cross-off
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
rain showers
part cloud
part cloud
part cloud
rain showers
light rain
mod rain
rain showers
light rain
rain showers
rain showers
clear
clear
part cloud
cloud
cloud
light rain
rain showers
clear
<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>
5:25
5:25
5:27
5:28
5:28
5:29
 mm
4
1
3
10
4
1
2
2
2
1
Temp °C
14
15
15
14
16
14
14
15
15
14
16
16
13
20
18
15
14
15
13
Feels °C
10
12
12
11
12
11
12
14
14
14
14
13
11
17
17
15
14
12
10
  • 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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