Thirroul Surf Break

Lat Long: 34.32° S 150.93° E

Thirroul Surf Forecast and Surf Report

Issued: 9 am 16 Sep 2026 (local time)

Forecast update in  hr  min

Today's Thirroul sea temperature is
18.1°C
0.4° 

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


Thirroul surf forecast from 16 Sep 2026:

  • Best quality surf: Thursday 17 Sep, 7PM (local time) - 6ft (1.8m), 9s period, SSE swell with glassy winds.
  • Most powerful swell: Wednesday 16 Sep, 10PM (local time) - 11ft (3.5m), 10s period, SSE swell with 2,507 kJ wave energy.
  • Next surfable swell (1★+): Thursday 17 Sep, 7PM (local time) - 6ft (1.8m), 9s period with SSE 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 Thursday (Sep 17) at 7PM. The primary swell is predicted to be 1.8m and 9s period with a secondary swell of 0.1m and 13s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Thirroul in the next 16 days are 3.5m 10s and forecast to arrive on Wednesday (Sep 16) at 10PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Friday (Sep 18) at 10PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 7PM (Thu 17th Sep)6ft (1.8m) 9s
Best Surf 7PM (Thu 17th Sep)6ft (1.8m) 9s
Most Powerful10PM (Wed 16th Sep)11ft (3.5m) 10s

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


The Lowdown

G'day, it's Rusty. Let's take a look at what's coming up for our little stretch of coast.

Straight off the bat, it's a bit of a tough start this Wednesday. We've got a solid 10ft S'ly swell hitting Thirroul, but that 19 mph SSW wind is making a mess of things with lumpy cross-chop. Thursday isn't much better with a 8ft SSE swell and cross winds, and the water temp is sitting at about 65°, which is pretty normal for this time of year.

Now, if you can hold out, Friday 18 September is where the good stuff starts. We've got a clean, glassy morning with a 4ft SSE swell and periods around 9 seconds – that's a nice little wave with moderate energy (355 in the combined swell energy). The winds are dead calm in the morning, so it'll be as clean as you'll see. Saturday 19 September drops off quickly though, with tiny 2ft waves and not much energy left.

The standout of this whole run is actually the afternoon of Sunday 20 September. It's only 2ft from the SSE, but the period is a ridiculous 18 seconds – that's serious groundswell energy (275 combined) and it's going to feel much better than the height suggests, especially as it's glassy. This will be a sneaky good session for the line-up at Thirroul. Because the swell direction is SSE and the optimum is SE, it's not a perfect match, but the long period will make it work.

During the next week, from Monday 22 September through to Thursday 25 September, the wind turns onshore and choppy most of the time with moderate wave energy up to around 800. It's a write-off for proper surfing unless you're desperate.

The following Friday 25 September afternoon has a little window of hope: 4ft from the NE with glassy conditions and light winds. It won't be big, but it'll be clean with 7-second period, so more of a longboarder's frolic.

Late in the run, Sunday 27 September morning shows a 6ft NE swell (729 energy), but it's only 8-second period and cross-shore winds, so it's average at best.

The last real highlight is Thursday 01 October morning. We've got a clean 5ft SSE swell with a solid 16 mph offshore W wind. The period is a short 6 seconds, so it'll be a bit bumpy but the offshore wind will hold it up nicely for more experienced surfers at Thirroul. The combined energy is moderate (283).

Overall, the Friday 20 September glassy session with that long-period groundswell is the pick, with the Friday 25 September afternoon a distant second.

Rusty out.

Short Range Forecast

Mostly dry. Warm (max 20°C on Fri morning, min 8°C on Wed night). Winds decreasing (fresh winds from the S on Wed afternoon, calm by Fri morning).

Days 4-6 Weather Summary

Light rain (total 4mm), mostly falling on Mon night. Warm (max 29°C on Sun morning, min 12°C on Mon night). Wind will be generally light.

Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tuesday
22
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
1
2
1
2
2
1
1
1
1
1
2
2
1
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
3
S
10
3
S
10
3.5
S
10
2.3
SSE
10
1.9
SSE
9
1.6
SSE
9
1.3
SSE
9
1.1
S
10
0.8
S
9
0.7
S
9
0.6
S
9
0.5
S
10
0.9
S
10
0.5
SSE
18
0.7
S
10
1.1
S
12
1.6
S
7
1.6
S
8
1.9
SSE
11
1.7
SSE
6
0.9
S
10
Wave Graph
Metric surfscale
Energy kJ
1700
1643
2291
940
572
363
289
216
110
83
64
49
146
195
96
341
233
324
769
213
151
Wind (km/h)
30
SSW
30
S
25
SSW
15
S
10
E
10
WNW
5
ESE
10
NE
20
W
10
WSW
10
WNW
10
W
5
NW
5
NNE
10
NW
20
SSE
25
SSE
20
S
25
S
20
SSE
15
ESE
Wind State
cross
cross-on
cross
cross
on
off
glassy
cross
cross-off
cross-off
off
cross-off
cross-off
glassy
off
cross-on
cross-on
cross-on
cross-on
cross-on
on
High Tide
11:17AM1.36m
11:46PM0.98m
12:02PM1.30m
00:43AM0.90m
12:58PM1.25m
1:57AM0.85m
2:06PM1.22m
3:21AM0.85m
3:17PM1.23m
4:28AM0.90m
4:18PM1.27m
5:18AM0.97m
5:08PM1.33m
Low Tide
5:56PM0.37m
5:23AM0.46m
6:56PM0.43m
6:08AM0.53m
8:07PM0.47m
7:08AM0.59m
9:23PM0.47m
8:26AM0.60m
10:27PM0.42m
9:42AM0.57m
11:15PM0.36m
10:42AM0.51m
11:53PM0.29m
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
cloud
light rain
cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:54
5:54
5:52
5:50
5:50
5:48
5:47
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:46
5:47
5:49
5:49
5:50
5:51
5:51
 mm
4
Temp °C
15
15
13
16
15
11
20
20
18
26
27
19
29
28
21
20
16
13
14
14
15
Feels °C
7
7
6
13
12
9
17
17
13
23
24
16
27
27
18
18
12
9
9
9
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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