Thirroul Surf Break

Lat Long: 34.32° S 150.93° E

Thirroul Surf Forecast and Surf Report

Issued: 9 am 04 Sep 2026 (local time)

Forecast update in  hr  min

Today's Thirroul sea temperature is
17.7°C
0.2° 

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


Thirroul surf forecast from 4 Sep 2026:

  • Best quality surf: Sunday 6 Sep, 10PM (local time) - 8ft (2.5m), 10s period, S swell with cross-offshore winds.
  • Most powerful swell: Thursday 10 Sep, 4PM (local time) - 10ft (3.0m), 12s period, S swell with 2,671 kJ wave energy.
  • Next surfable swell (1★+): Friday 4 Sep, 7PM (local time) - 2.5ft (0.7m), 7s 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 Friday (Sep 04) at 7PM. The primary swell is predicted to be 0.7m and 7s period with a secondary swell of 0.3m and 8s. 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 3.0m 12s and forecast to arrive on Thursday (Sep 10) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Sunday (Sep 06) at 4AM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 7PM (Fri 4th Sep)2.5ft (0.7m) 7s
Best Surf10PM (Sun 6th Sep)8ft (2.5m) 10s
Most Powerful 4PM (Thu 10th Sep)10ft (3.0m) 12s

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


The Lowdown

G’day, Rusty here. It’s going to be a bit of a mixed bag for Thirroul over the next 16 days. The first week is pretty slim pickings with mostly small, average energy waves and less-than-ideal winds. We do get a few windows of cleaner conditions, but nothing that screams “drop everything and go.” The water temp is sitting at 18° – pretty much bang on average for this time of year, so no surprises there.

Alright, let’s start with Friday morning, September 4th. It’s actually not a bad little session. Thirroul is a beach and reef setup, exposed to the S swell, and we’ve got a clean 3ft S swell rolling in with a 10-second period and moderate energy (213). The wind is a light WSW cross-off, so it’ll be glassy and clean. This is the best the first week has to offer – a true standout for the period. Crowds are possible here, so keep your eyes peeled. After that, things go flat and ordinary: Saturday with 2ft – 2ft and mostly messy winds, Sunday a tiny 2ft NE, and Monday a small 4ft S but with onshore wind kicking in by the arvo. Tuesday the 8th bumps up to 7ft – 7ft SSE, but it’s a mixed bag of cross and onshore wind with lots of energy (776 – 1033), so it’s messy and only really for the keen. Wednesday morning, the 9th, has some hope: 5ft SSE at 9 seconds, clean cross-off WSW breeze, energy of 318 – surfable and clean, but not a standout.

Then from Thursday the 10th through to the start of the second week, it gets bigger but wind-ruined. Thursday has 8ft – 10ft S swell with strong energy (1855 – 4851), but the wind is cross to cross-on and choppy. That’s expert territory with the size, but the wind kills it. Friday the 11th drops back to 7ft – 6ft SSE, still cross-shore chop. Saturday the 12th sees 5ft SSE and light onshore wind – ripply. Sunday the 13th is tiny again, 3ft.

Now, we’ve got a gap of a few days. Monday the 14th and Tuesday the 15th are mostly close to flat, with Tuesday morning offering a surprise: 6ft NE swell but only 6-second period, and clean N cross-off wind. That’s clean but short-period, so it’s a bit fat. Wednesday the 16th is poor.

The real standout for the whole outlook lands on Thursday afternoon, September 17th. That afternoon, Thirroul sees a 10ft S swell with a long 12-second period – that’s serious groundswell energy (3364). And the wind? Light W offshore. Conditions are clean. This is an expert-only session – it’s going to be big, powerful, and the long period will make it fat on the beach, but at a reefier part of the setup, it’ll be world-class. This is the one to circle on the calendar, but remember it’s two weeks out, so forecasts could shift. After that, Friday the 18th and Saturday the 19th have leftover 10ft – 7ft SSE swell but onshore winds kick in, making it lumpy and choppy again.

Best bet: Friday morning September 4th for a clean, fun surf, and the real cracker – Thursday afternoon September 17th for those who can handle big, clean groundswell.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 29°C on Sat morning, min 12°C on Sun night). Winds increasing (light winds from the WSW on Fri morning, fresh winds from the WSW by Sat night).

Days 4-6 Weather Summary

Light rain (total 2mm), mostly falling on Wed afternoon. Warm (max 21°C on Mon morning, min 9°C on Mon night). Mainly fresh winds.

Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
0
1
1
0
0
0
0
3
1
0
1
2
2
3
2
0
1
2
0
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1
S
10
0.7
S
7
0.5
S
11
0.6
S
9
0.5
S
10
0.7
NE
7
0.6
SSW
6
0.7
S
8
2
S
9
1.2
S
8
1.3
SSE
8
3.5
SSE
10
2
SSE
10
2.2
SSE
10
1.7
SSE
10
1.4
SSE
9
1.7
SSE
9
3
SSE
10
2.5
S
11
3
S
12
2.5
SSE
12
Wave Graph
Metric surfscale
Energy kJ
179
54
57
58
44
47
25
68
642
172
216
2377
763
1031
508
315
464
1601
1599
2671
1706
Wind (km/h)
5
WSW
5
NE
10
WNW
15
N
20
NW
30
W
15
WSW
15
SSE
10
W
10
NW
20
SE
30
S
15
S
10
ESE
10
NW
5
WSW
30
SSE
30
SSW
20
SSW
25
S
15
SW
Wind State
cross-off
cross-on
off
cross-off
cross-off
cross-off
cross-off
cross-on
cross-off
off
cross-on
cross
cross
on
off
cross-off
cross-on
cross
cross
cross-on
cross-off
High Tide
1:27PM1.40m
2:19AM0.94m
2:40PM1.42m
3:46AM0.95m
3:54PM1.47m
5:00AM1.00m
4:59PM1.53m
5:58AM1.09m
5:56PM1.59m
6:46AM1.18m
6:46PM1.62m
7:28AM1.27m
7:32PM1.61m
Low Tide
8:25PM0.34m
7:50AM0.45m
9:47PM0.30m
9:09AM0.46m
10:57PM0.22m
10:24AM0.42m
11:54PM0.14m
11:28AM0.35m
00:42AM0.07m
12:24PM0.27m
1:23AM0.03m
1:15PM0.21m
2:01AM0.03m
clear
clear
part cloud
clear
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
part cloud
light rain
rain showers
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:11
6:09
6:09
6:07
6:05
6:05
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:38
5:39
5:39
5:40
5:42
5:42
5:43
 mm
1
1
Temp °C
21
21
16
29
28
19
21
19
14
21
18
14
15
15
11
19
16
11
14
15
12
Feels °C
18
19
14
25
24
15
16
16
11
19
14
6
12
12
9
17
11
4
7
9
7
  • Map Icons:
  • Break
  • 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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