Thirroul Surf Break

Lat Long: 34.32° S 150.93° E

Thirroul Surf Forecast and Surf Report

Issued: 3 pm 01 Sep 2026 (local time)

Forecast update in  hr  min

Today's Thirroul sea temperature is
17.7°C
0.3° 

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


Thirroul surf forecast from 1 Sep 2026:

  • Best quality surf: Monday 7 Sep, 1AM (local time) - 5ft (1.5m), 12s period, S swell with offshore winds.
  • Most powerful swell: Monday 7 Sep, 1AM (local time) - 5ft (1.5m), 12s period, S swell with 617 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 1 Sep, 10PM (local time) - 2.5ft (0.7m), 10s 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 (Sep 01) at 10PM. The primary swell is predicted to be 0.7m and 10s period with a secondary swell of 0.5m and 5s. 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 12s and forecast to arrive on Monday (Sep 07) at 1AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Saturday (Sep 05) at 4PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Tue 1st Sep)2.5ft (0.7m) 10s
Best Surf 1AM (Mon 7th Sep)5ft (1.5m) 12s
Most Powerful 1AM (Mon 7th Sep)5ft (1.5m) 12s

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


The Lowdown

G’day, Rusty here. Look, I’ll be straight with you—this 16-day stretch for Thirroul is a bit of a slow burn, but there’s a serious payoff if you’re willing to wait. The first week or so is pretty ordinary, with small, weak swells and not much to get excited about. Then, around the 9th of September, things properly turn on. We’ve got a solid run of serious swell and good conditions coming, but it’s mostly for experienced surfers.

Right now, the first few days are a bit of a write-off. Starting Tuesday the 1st of September, we’ve got small 3ft swell from the S with a 10-second period, and it’s cross-offshore with a light breeze. The combined energy is only 174, so it’s weak. The water is 64°, which is pretty normal for this time of year. Nothing to rush for. Wednesday and Thursday are even smaller, with swell dropping to 2ft-2ft and energy falling into the double digits. The wind is mostly cross-off, but the waves are just too small and weak to bother with.

Friday the 4th sees a slight uptick with 3ft swell from the S, and the wind goes offshore—light from the NW—so it’s clean. Still, the energy is only 144, so it’s marginal. Saturday looks even worse, with a strong 35 km/h W wind making a mess of things. You’d be better off staying home.

Then comes Sunday the 6th of September. The morning is the standout of the first week. We get a 4ft swell from the S with a 10-second period, and it’s glassy—absolutely flat calm with a light E breeze. The combined energy jumps to 335, which is moderate. The waves will be clean and fun for a shortboard. It’s not huge, but it’s the best you’ll see until the big stuff arrives. The afternoon gets choppy with a cross-on wind, so get out early.

Monday the 7th through to Wednesday the 9th morning is a mixed bag of cross-shore winds and small to moderate swell. Nothing special, but the swell starts to build.

Now, here’s where it gets real. Wednesday the 9th of September afternoon is a game-changer. We’ve got a 10ft swell from the S with an 11-second period, the wind is fresh offshore from the W at 20 km/h, and the combined energy is a massive 3057. That’s very strong energy. This is excellent surf, but it’s for experienced surfers only—over 8ft is expert territory. The offshore wind will keep it clean, and the longer period means proper groundswell lines. This is the best on offer in the whole outlook.

Thursday the 10th is still big, with a 13ft swell from the S in the morning, but the wind is cross-off and a bit stronger. Friday the 11th might be the pick of the big wave days. We’ve got a 10ft swell from the SSE with a very long 13-second period, the wind is light offshore, and the energy is 3070. The morning is clean, and the afternoon goes glassy with a SW breeze. These are dream conditions for a point break or reef, but Thirroul is a beach and reef setup, so that long period might make it a bit straight at the beach. Still, for experts, it’s going to be a session to remember.

Saturday the 12th gets messy with a strong 30 km/h SSW cross-shore wind and a 12ft swell. The energy is 4257, the highest in the forecast, but the wind will chop it up. Not ideal for surfing—looks more interesting for kite surfing if you’re into that.

The second week settles down. Sunday the 13th is still lumpy, but Monday the 14th morning is a good one. We get a 5ft swell from the ESE with an 11-second period, glassy conditions, and energy of 564. That’s clean, moderate, and fun for all levels. Tuesday the 15th afternoon also looks very good with a 6ft swell from the S, glassy, and 626 energy.

So, to wrap it up: the first week is mostly flat and weak. The best surf is the big swell window from Wednesday the 9th to Friday the 11th of September, but it’s for experts only. The glassy morning on Sunday the 6th and the clean, moderate swell on Monday the 14th are the best bets for the average surfer. Don’t hold your breath for the first few days, but the second week has some real gems.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Wed morning, min 12°C on Thu night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Sat morning, min 11°C on Sat night). Winds decreasing (fresh winds from the WNW on Sat afternoon, light winds from the E by Sun morning).

Tue
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
1
1
1
1
0
1
1
1
1
1
0
0
2
0
3
1
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.8
S
10
0.7
S
10
0.6
S
10
0.6
S
10
0.5
S
10
0.5
SSE
10
0.5
S
10
0.4
SSE
10
0.8
S
10
0.5
S
7
0.4
S
10
0.5
S
10
0.4
S
10
0.3
S
9
1.3
S
10
1.2
S
9
1.5
S
12
1.2
S
10
1
S
10
1
SSE
9
Wave Graph
Metric surfscale
Energy kJ
138
98
77
73
49
59
52
32
118
26
32
49
28
15
320
240
617
279
184
177
Wind (km/h)
10
NNW
10
NNW
15
NW
15
WSW
15
NW
15
WSW
20
W
10
WSW
10
NW
5
N
10
NNW
10
NNW
40
WNW
15
W
5
E
15
ENE
10
NW
10
NNE
15
NE
5
SW
Wind State
cross-off
cross-off
cross-off
cross-off
off
cross-off
cross-off
cross-off
off
cross-off
cross-off
cross-off
off
cross-off
glassy
cross-on
off
cross
cross
cross-off
High Tide
10:56PM1.23m
11:28AM1.41m
11:50PM1.11m
12:22PM1.41m
00:56AM1.01m
1:27PM1.40m
2:19AM0.94m
2:40PM1.42m
3:46AM0.95m
3:54PM1.47m
5:00AM1.00m
4:59PM1.53m
Low Tide
4:58PM0.28m
5:01AM0.25m
5:55PM0.31m
5:45AM0.32m
7:04PM0.34m
6:40AM0.40m
8:25PM0.34m
7:50AM0.45m
9:47PM0.30m
9:09AM0.46m
10:57PM0.22m
10:24AM0.42m
11:54PM0.14m
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:11
6:09
6:09
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:37
5:37
5:37
5:38
5:39
5:39
5:40
 mm
Temp °C
25
17
26
26
19
23
22
15
22
21
15
26
23
19
18
17
13
22
20
16
Feels °C
22
15
23
23
16
18
17
10
17
19
13
22
16
17
15
14
12
19
17
16
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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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