Thirroul Surf Break

Lat Long: 34.32° S 150.93° E

Thirroul Surf Forecast and Surf Report

Issued: 9 am 01 Sep 2026 (local time)

Forecast update in  hr  min

Today's Thirroul sea temperature is
17.5°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 1 Sep 2026:

  • Best quality surf: Monday 7 Sep, 10PM (local time) - 5.5ft (1.7m), 7s period, NE swell with offshore winds.
  • Most powerful swell: Sunday 6 Sep, 7AM (local time) - 4.5ft (1.3m), 11s period, S swell with 411 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 1 Sep, 4PM (local time) - 2.5ft (0.8m), 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 4PM. The primary swell is predicted to be 0.8m and 10s period with a secondary swell of 0.6m and 4s. Another secondary swell of 1.1m and 5s 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 1.3m 11s and forecast to arrive on Sunday (Sep 06) at 7AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Saturday (Sep 05) at 4PM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 4PM (Tue 1st Sep)2.5ft (0.8m) 10s
Best Surf10PM (Mon 7th Sep)5.5ft (1.7m) 7s
Most Powerful 7AM (Sun 6th Sep)4.5ft (1.3m) 11s

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


The Lowdown

G’day, Rusty here, and let’s be straight – the next couple weeks at Thirroul are a bit of a mixed bag. We’ve got a long wait for anything truly special, but hang in there, because the finish line has a real gem. For the first week, it’s mostly small, ordinary waves with average winds, nothing to get excited about. The real standout, and I mean a proper standout, lands on Friday the 11th of September.

Right now, on Tuesday the 1st, we’ve got tiny 3ft south swell with a moderate combined energy (174) and a light NNW cross-off breeze. The sets are around 11 seconds, so there’s a touch of push, but honestly, it’s just surfable. Water temp is 64°F, which is pretty average for this time of year, so no need to dig the extra rubber out yet.

Wednesday the 2nd is more of the same – 2ft south swell, energy dropping (108), with a NW cross-off. You could paddle out, but you won’t be telling stories about it.

Thursday the 3rd is a write-off. Swell drops to 2ft, energy is weak (92), and moderate cross-off winds make it feel even smaller. Poor conditions all day.

Friday the 4th gives a small bump in the morning – 3ft south swell (136 energy) – but the real highlight is the afternoon glass-off. Winds go calm with a glassy surface, and though the swell is only 1.0ft from the SSE with 11 seconds, it’s clean. Not for a proper session, but if you’ve got a log, you could get a few silky ones.

Saturday the 5th morning has 2ft south swell and a cross-off, nothing flash. The afternoon brings fresh offshore WNW wind at 22 mph, which cleans up the 1ft waves (47 energy) but the size is laughable.

Sunday the 6th is a weird one – 4ft south swell in the morning (221 energy) but with an onshore easterly. That’s messy. Afternoon picks up a 3ft SSE swell, but it’s cross-onshore and lumpy. A skip.

Monday the 7th through Wednesday the 9th stays mediocre: small south swells around 3–4ft, cross-off or cross winds, and solid energy drops. Not worth the paddle.

Then Thursday the 10th of September starts to wake up. A big 13ft south swell hits in the morning, combined energy is 5594 – that’s strong – but the cross wind is gusty and fresh, creating lumps and chop. It’s way over 8ft, so only for experts, and with the cross wind, it’s a real wrestle. Afternoon drops to 10ft (2221 energy) but still messy.

Now here’s the one you’ve been waiting for – Friday the 11th of September. Morning brings an exceptional 15ft south swell, combined energy is a massive 10046, with a period of 12 seconds, and it’s glassy. Dead calm. This is big, powerful groundswell, clean as a whistle, and because Thirroul is a beach and reef setup, that long period swell will really wrap into the reef lines and points. It’s huge – over 8ft – so this is absolutely for experienced, expert surfers only. If you’re not in that bracket, watch from the rocks. The afternoon sees the wind swing cross-onshore, so the window is the early session. This is the true standout.

Saturday the 12th morning still has clean 5ft swell (372 energy) and glassy conditions, so a decent consolation. Afternoon gets chopped up by the onshore breeze.

Sunday the 13th offers 5ft SSE swell (537 energy) with light cross winds, but by afternoon it turns choppy again. Monday the 14th is similar with 4ft ESE swell, though mornings are cleaner.

Tuesday the 15th and Wednesday the 16th see the swell fade back to small, ordinary 3–4ft stuff with increasing wind, so the dream run is over.

Bottom line: the first week is a slow grind with tiny, average waves. The clear winner is the morning of Friday the 11th – massive, glassy, expert-level south groundswell. That’s the one to circle on the calendar.

Rusty.

Short Range Forecast

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

Days 4-6 Weather Summary

Mostly dry. Warm (max 25°C on Sat morning, min 12°C on Sat night). Winds increasing (calm on Fri afternoon, fresh winds from the WNW by Sat morning).

Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
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
2
1
1
1
1
0
0
1
1
1
1
1
0
0
1
0
2
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
11
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
9
0.5
S
7
0.4
S
10
0.5
S
10
0.4
S
10
0.3
S
9
1.1
S
9
1
SSE
8
1
S
11
0.9
S
10
0.8
S
10
1.5
NE
7
Wave Graph
Metric surfscale
Energy kJ
149
138
98
77
73
49
60
52
32
109
24
32
48
28
14
207
140
251
148
120
235
Wind (km/h)
10
NNW
10
NNW
10
NNW
15
NW
15
W
15
NW
15
WSW
25
W
10
W
10
NW
5
N
10
NNW
15
NNW
35
WNW
15
WSW
10
E
20
ENE
10
NW
15
N
15
N
5
W
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
off
cross-off
cross-off
cross-off
cross-off
glassy
cross-off
cross-off
off
cross-off
on
cross-on
cross-off
cross-off
cross-off
glassy
High Tide
10:43AM1.41m
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
clear
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
part cloud
clear
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:16
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
25
18
25
26
18
23
21
15
21
21
15
25
24
18
17
17
13
22
19
16
Feels °C
20
22
15
22
23
15
18
15
10
16
19
13
19
18
14
14
13
11
20
17
17
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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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