Thirroul Surf Break

Lat Long: 34.32° S 150.93° E

Thirroul Surf Forecast and Surf Report

Issued: 3 pm 10 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 10 Sep 2026:

  • Best quality surf: Friday 11 Sep, 4AM (local time) - 7ft (2.1m), 10s period, S swell with cross-offshore winds.
  • Most powerful swell: Friday 11 Sep, 4AM (local time) - 7ft (2.1m), 10s period, S swell with 849 kJ wave energy.
  • Next surfable swell (1★+): Thursday 10 Sep, 10PM (local time) - 6ft (1.9m), 10s 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 10) at 10PM. The primary swell is predicted to be 1.9m and 10s period with a secondary swell of 0.2m and 9s. 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 2.1m 10s and forecast to arrive on Friday (Sep 11) at 4AM. Winds are predicted to be cross-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 Sunday (Sep 13) at 1AM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Thu 10th Sep)6ft (1.9m) 10s
Best Surf 4AM (Fri 11th Sep)7ft (2.1m) 10s
Most Powerful 4AM (Fri 11th Sep)7ft (2.1m) 10s

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


The Lowdown

G'day, it's Rusty.

Alright mate, let's have a look at the forecast for the next couple of weeks. It's a bit of a mixed bag, with a lot of marginal days to wade through before we get a couple of genuine standouts. The water temp is sitting right on average for this time of year at 64°F, nothing unusual there.

The first real chance to get wet comes in on Thursday the 10th of September, but honestly, it's a tough one. Thirroul is a beach and reef setup, exposed to the south-east, and we've got a 7ft S swell rolling in at 9 seconds. The energy is moderate (825), but that SSE wind is blowing cross-on at 12 mph, making it choppy and poor. Not worth paddling out for.

Friday the 11th is much the same story. The swell drops to 5ft on Friday morning, but the wind is still cross-on from the SSE, though lighter at 3 mph. The wave energy is moderate (432), but it's still a marginal call. The afternoon sees onshore wind and a 5ft S swell (358). It's just not clean.

Saturday the 12th and Sunday the 13th are a write-off. The swell is small and weak, under 3ft, with cross-shore winds and energy dropping from 334 down to 147. Poor conditions across the board.

Monday the 14th is a tease. The morning is flat with a 2ft S swell, but we get a clean, light cross-offshore breeze from the NNW. The energy is weak (121). It's surfable, but very ordinary. The afternoon goes back to poor.

Tuesday the 15th is a horrible day. Crazy short period swell of 4 seconds in the morning, then a jump to 5ft in the afternoon with fresh cross-onshore winds. It's choppy and messy.

Now, Wednesday the 16th of September is where things get interesting. The morning brings a solid 7ft S swell with a 9-second period. The combined energy jumps to a strong 1354. The wind is light and cross-on from the SSE, so it's not perfect, but there's a lot of water moving. This is a big swell for the area, and at 7ft, it's pushing into expert territory.

But the real standout, the one I'd circle on the calendar, is Saturday the 19th of September. Thirroul is going to be firing. We've got a 8ft S swell with a 10-second period, and the energy is massive at 1320. The wind is a clean offshore from the WNW at 9 mph. This is an excellent setup for experienced surfers. The swell direction (S) matches the optimum direction for the break (SE), and the offshore wind will groom it into perfection. The period is solid, giving it proper shape and power. It's a big day, so it's only for the crew who know what they're doing, but it's the best on offer by a long shot. Crowds are possible here, so get in early.

Sunday the 20th of September is still solid, with a 7ft SSE swell (1100 energy) in the morning, but the wind shifts to a cross-shore NNE, putting a bit of chop on the face. Still a good wave, but Saturday is cleaner.

The following week fades out. Monday the 21st has a 6ft SE swell (600 energy) with light cross-onshore wind, which is marginal. Tuesday the 22nd is small and poor. Wednesday the 23rd is a clean but tiny 3ft NE swell (89 energy) – not enough to ride. Thursday the 24th of September is a late highlight: a 6ft NE swell with clean offshore WNW wind (456 energy). It's a fun size, nice and clean, but the swell direction is coming from the NE, which is not the optimum for Thirroul. Still, it's a good surf. Friday the 25th is back to poor with strong onshore winds.

To sum it up: the period is a slow burn, but Saturday the 19th of September is the clear winner – big, powerful, offshore, and excellent for experts. The 24th is a decent backup. Don't bother with the first week.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 22°C on Sun morning, min 11°C on Thu night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 4mm), mostly falling on Tue afternoon. Warm (max 28°C on Mon morning, min 14°C on Tue afternoon). Wind will be generally light.

Thu
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
3
1
1
2
1
0
1
0
0
1
1
0
1
0
0
0
2
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)
2
S
9
1.8
SSE
10
1.6
SSE
10
1.5
SSE
9
1.1
SSE
10
1
SSE
11
0.9
SSE
10
0.8
SSE
9
0.8
S
11
0.7
S
10
0.7
S
10
0.6
S
11
0.6
S
10
0.4
SSE
10
0.8
SSE
4
1.4
SSE
6
2
SSE
9
2.2
S
9
1.4
SSE
8
1.2
S
10
Wave Graph
Metric surfscale
Energy kJ
705
640
426
352
230
249
173
118
143
102
104
83
80
31
26
122
560
753
226
302
Wind (km/h)
20
SSE
10
SW
5
SSE
10
E
5
W
10
NNE
20
NE
10
NW
10
NNE
25
NE
10
WNW
10
NNW
5
NNE
10
W
15
SE
20
SSE
15
SSE
10
SSE
5
E
5
WNW
Wind State
cross-on
cross-off
cross-on
on
cross-off
cross
cross-on
cross-off
cross
cross
off
cross-off
cross
cross-off
cross-on
cross-on
cross-on
cross-on
on
off
High Tide
7:32PM1.61m
8:08AM1.35m
8:15PM1.56m
8:46AM1.41m
8:57PM1.46m
9:23AM1.44m
9:37PM1.35m
9:59AM1.44m
10:18PM1.22m
10:37AM1.41m
11:00PM1.09m
11:17AM1.36m
11:46PM0.98m
Low Tide
2:01AM0.03m
2:02PM0.17m
2:37AM0.06m
2:48PM0.16m
3:10AM0.12m
3:33PM0.18m
3:42AM0.20m
4:18PM0.23m
4:14AM0.28m
5:05PM0.29m
4:47AM0.37m
5:56PM0.37m
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
part cloud
part cloud
part cloud
cloud
light rain
light rain
part cloud
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
5:58
5:58
5:56
5:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:43
5:44
5:45
5:45
5:45
5:46
5:46
 mm
2
2
Temp °C
15
12
17
16
13
20
18
13
22
19
17
28
26
21
16
15
14
14
15
12
Feels °C
11
10
15
15
13
16
14
12
18
15
14
26
24
18
14
12
11
12
13
10
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  • 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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